Polyvinylidene chloride (PVDC), due to the symmetry and strong polarity of the two chlorine atoms in its monomer, makes its homopolymer have high crystallinity, so that the solubility of the gas in it is low, and the diffusion is slow, so that the barrier property of oxygen, water and water vapor is good. In addition, due to the high chlorine content, it also has the advantages of flame retardant, corrosion resistance and biodegradation resistance, so PVDC film is now widely used as packaging materials and protective fabrics. However, the two symmetric chlorine atoms in the vinylidene chloride molecule are extremely unstable to heat, and can only be used at 100 ° C, and HCl is released when heated to 125 ° C, forming conjugate double bonds, making the polymer yellow or brown, and finally black. In order to improve the thermal stability of PVDC, improve the processability and use performance, a variety of additives are usually added directly to PVDC before processing. The commonly used auxiliaries for film formation are plasticizers, stabilizers, etc. 1 Plasticizer PVDC film often used plasticizer are dibutyl sebacate (DBS), dioctyl sebacate (DOS), dioctyl adipate (DOA), tributyl citrate (TBC), acetyl-tributyl citrate (ATBC). Its main function is to reduce intermolecular forces in order to facilitate plasticization. In the selection, it is mainly required to have good compatibility with resin and meet the needs of food hygiene. Different plasticizers have different characteristics, so in actual use, two different plasticizers are often used to complement each other, to meet the requirements of processing performance and product performance, the amount of addition is generally 5 ~ 7phr, the amount of plasticizer is low, will produce a reverse plasticizer effect, so that it is rigid; If the amount of addition is too much, the barrier property and mechanical property of the product are greatly reduced. 2 Stabilizer PVDC usually adds some epoxy compounds with heat stability during film formation, such as epoxy soybean oil (ESO), epoxy linseed oil (ESL), etc. As a heat stabilizer, the epoxy structure of these epoxy compound molecules can interact with HCl, prevent or delay thermal decomposition, and have obvious plasticizing effect. The addition amount of epoxy compounds is generally 0.5 ~ 2.5phr, and the amount is too much, which is easy to migrate to the surface of the film, causing the film to be sticky and affecting the film formation. Glycidyl methacrylate can also be used as a heat stabilizer. The function of lubricant is to reduce the mutual friction between PVDC resin and extruder cylinder and screw due to mechanical shear force during film formation, reduce the PVDC material stagnated in the screw and die head, effectively prevent thermal decomposition, which is conducive to the improvement of film formation rate, and also make the film surface glossy. Commonly used lubricants are metal salts of stearic acid, stearic acid glycerides, stearic acid amides, etc., the general amount of addition is 011 ~ 1phr, and too much lubricant will affect the self-viscosity of the film. When PVDC film is formed, it is usually necessary to add a small amount of inorganic filler, commonly used calcium carbonate, talc powder, magnesium oxide, kaolin, calcium hydroxide, titanium dioxide and so on. The addition of filler can not only adjust the different barrier properties, but also improve the processing properties and mechanical properties of the film. For example, when improving the printability of the film and the smoothness of the surface, the addition amount is generally 0101 ~ 3phr, subject to no loss of film transparency. In addition, the addition of titanium dioxide can prevent bubbles and white spots caused by the thermal decomposition of the resin, and does not affect the barrier property of the film. The addition of magnesium oxide can also form a film at a higher temperature, which can make the PVDC resin with a wider molecular weight distribution have a larger extrusion rate. In addition, the addition of talc can play the role of nucleating agent and accelerate the crystallization rate. 5 Polymer modifiers Although PVDC has excellent barrier properties, but there are still defects in the processing performance of the resin, thermal stability and film strength, in order to better improve a performance or adapt to some special uses, in addition to the commonly used, small molecular weight additives, but also often according to the need to add polymer blending to improve its performance. 511 Improve thermal stability and processing performance PVDC due to its poor thermal stability, easy to decompose, so that the processing performance is poor. In order to improve the processing performance, it is necessary to improve the thermal stability. For this purpose, the modifiers that need to be added are: elastomer or rubber body of ethylene alkane copolymer, the amount of addition is 2% to 20%; EVA copolymer containing 5% to 18% vinyl acetate and melting flow of 011 to 110dg/min, adding 5% to 40%. The modifiers used to improve the processability of resin include styrene copolymer, vinylidene chloride copolymer and methyl acrylate copolymer; In addition, vinylidene chloride with different molecular weights can also be blended with vinylidene chloride copolymer resins [16], such as vinylidene chloride polymer 100phr, styrene content >20% softening temperature 50 ~ 180℃ polymer 0101 ~ 5phr, plasticizer or stabilizer 0.1 ~ 3phr formula, can be obtained high barrier, good processing performance group The thing. A PVDC resin with a molecular weight of 50,000 ~ 300,000 and another PVDC resin with a molecular weight of ≥5000 can be blended to obtain a copolymer with excellent processing properties. 512 Improving film strength Blend modifiers used to improve film strength are styrene copolymers, such as styrene-isobutene, styrene-acrylonitrile, styrene-methyl acrylate, styrene-butadiene, etc. Butadiene - methyl methacrylate, ethylene - vinyl acetate, polyamide, grafted acrylates and other copolymers or these elastomers. For example, the addition of polyamide can improve the impact strength at low temperatures and has higher barrier properties. 513 Improve the softness of the film PVDC film itself is poor, adding ordinary plasticizers can be improved, but due to the migration of plasticizers during the film formation process, it is not appropriate to use special heat sealing such as high-frequency heat sealing. If 10% ~ 15% ethylene-acrylic alkyl ester copolymer is used, the film can have softness, cold resistance, heat sealing and barrier properties, and improve the processing performance. 513 To improve the transparency of the film using vinyl chloride-vinyl acetate copolymer, the chlorine content is 1% ~ 50%, the dosage is 1% ~ 40%; Or 1%-40% copolymer of ethylene chloride-methyl methacrylate is blended with PVDC; Or by blending two kinds of PVDC with different molecular weight, the film with high transparency can be prepared. 514 Improve the self-adhesive and adhesive properties of the film to improve the self-adhesive and adhesive properties of the PVDC film, adding a liquid plasticizer (such as citric acid ester) can improve the self-adhesive and adhesive properties, but also can be used as a plasticizer. However, the solubility of the liquid plasticizer in PVDC is limited, and it often migrates to the surface of the film or even to the vessel. Although this method can sometimes increase the self-adhesive and adhesive properties of the film, there are still problems of adhesion between films. If the ethylene content is 50% to 65%, the molecular weight is 1000 to 4000 ethylene-vinyl acetate copolymer, the addition amount is 011% to 70%, and can be used with plasticizer. Responsible Editor: Qiao Tong
Graphene welcomes catalyst. The 2017 China International Graphene Innovation Conference will open on September 24, at which the English version of the 2017 Global Graphene Industry Research Report will be officially released for the world. Analysts believe that this will become another heavy catalyst for the continued performance of the graphene plate. In the secondary market, data show that the graphene index rose 0.6% yesterday. The 2017 China International Graphene Innovation Conference will be held in Nanjing from September 24 to 26, with the theme of "Global cooperation and division of labor". At that time, more than 3,000 people will attend the conference, including heads of national graphene institutions, the world's top graphene experts, industry-related organizers and representatives of key enterprises. At the same time, the conference will also hold the 2017 China International Graphene Materials Application Expo and 100 results exhibition activities. At this press conference, the English version of the "2017 Global Graphene Industry Research Report" prepared by the Industrial Research Center of the China Graphene Industry Technology Innovation Strategic Alliance was officially released for the world. The report predicts that the global graphene application market will reach 100 billion yuan in 2020, and China will occupy a dominant position in the global graphene market. At present, the graphene industry has passed the preparation and research stage and entered the application research and development period. The academic community focuses on graphene mainly to see its properties, while the industry focuses on its cost performance. Haitong Securities believes that the current industrialization of graphene includes two paths, one is the mass production of graphene raw materials, and the other is large-scale investment in the application field. At present, the graphene industry has basically passed the research and development stage of preparation, and the performance of raw materials is no longer a problem. The downstream products of graphene have three main aspects. The powder is mostly used in the energy field, and the film is mostly used in clothing and electronic products. The application in the field of powder is generally low in cost performance, and there are other mature alternative products. In terms of clothing, graphene clothing is currently positioned as a high-end product, whether it can achieve market promotion, and whether people recognize its higher added value, it takes time to test; In the field of electronics, the eruption point of flexible display is currently determined, and the market may not be small in the short term, in terms of thermal conductivity film, high thermal conductivity graphite film is also very mature, and the qualification rate of graphene thermal conductivity film also needs to be improved. Graphene industrialization in China started early, rapid development, ranking in the forefront of the world. With the promulgation of the policy focusing on the development of graphene in the "Made in China 2025" and the "13th Five-Year Plan" Special Plan for Scientific and Technological Innovation in the Field of Materials, the industrialization of graphene has further ushered in an investment boom. "In the face of the problem of the graphene industry, the key is to remove the fake and preserve the real, and discover the graphene enterprises that invest in real things." Tianfeng Securities believes that in the many downstream applications of graphene powder, graphene lithium battery conductive agent is expected to become the first breakthrough point in the downstream application of graphene by virtue of its huge market size, simple replacement of the existing system, and low comprehensive cost.
"Environmental protection is the catalyst for enterprises to achieve a leap forward, and it is also the most important starting point to reduce business risks." Lin Xiao, an associate researcher at the Institute of Process Engineering, Chinese Academy of Sciences, pointed out. Li Xinchuang, vice president of the China Iron and Steel Association, president of the Metallurgical Industry Planning and Research Institute and Party secretary, also said, "No matter how the society progresses, steel materials will still be the most important and widely used structural materials and functional materials." The sustainable development of the steel industry cannot get around the sill of environmental protection. At present, even for enterprises with relatively high technical level, the pollution control cost has reached 150 to 200 yuan per ton of steel, accounting for 6% to 8% of the total production cost." Experts stressed that the sustainable development of steel enterprises, comprehensive cost minimization and meeting the requirements of the latest environmental emission standards are indispensable, and this requires pollution control based on the full life cycle, but also inseparable from technological innovation. The "nine chemical coordination" promotes the industry to upgrade the total amount of energy, individual amount of energy consumption, emission permit system, etc., which can be used as a starting point for green and low-carbon development in recent years, steel has become a hot topic, overcapacity, serious pollution, price fluctuations, etc., can always attract attention, everyone is asking: what happened to steel? "Steel and the economy are inseparable, and the rapid economic development has brought huge development dividends to China's steel industry, and technological progress has promoted the take-off of the steel industry." Li Xinchuang believes that with the slowdown of economic development, the steel industry can no longer grow rapidly for a long time in the future, and will enter a high hovering stage. The importance of steel in the national economy is self-evident, and some cities in China are "born because of steel", and the steel industry and the city have become a highly integrated whole. Where is the way out for steel in the future? Li Xinchuang's answer is "nine chemical synergies". "We want to reshape the value chain of steel, through green, orderly, so that the industry orderly development; Through quality, standardization, differentiation, service, diversification, intelligence, and constantly improve the competitiveness of the industry. At the same time, we will encourage qualified enterprises to internationalize and actively go global." It should be said that whether an enterprise can achieve sustainable development depends not only on whether it is profitable, but also on whether the relationship between the enterprise and the surrounding environment is harmonious. "Now, the steel industry is under great pressure, and environmental protection has become an important part of restricting the sustainable development of the steel industry." Cao Hongbin revealed such a set of data: at present, even if the technical level is relatively high, the consumption of tons of molten steel has reached 3 tons, the energy consumption of tons of steel is about 580 kilograms of standard coal, and the pollution control cost has reached 150 yuan to 200 yuan per ton of steel, accounting for 6% to 8% of the total production cost. Li Xinchuang said: "Steel enterprises face the pressure of total energy and energy consumption, the implementation of the emission permit system also requires the change of the past environmental management system, which is an important starting point for enterprises to promote green and low-carbon development." Combining environmental protection and the whole production process with environmental protection is not only a matter of environmental protection, to promote the improvement of the entire production process and system optimization After years of environmental protection transformation and pollution control, some conventional pollutants in the steel industry such as COD, SO2 and so on have been better controlled, and now are left behind are difficult to degradation, relatively low concentration, and relatively toxic pollutants. Governance costs are higher. "To support the sustainable development of steel enterprises, comprehensive cost minimization and meeting the requirements of the latest environmental protection emission standards are indispensable, and the low-cost system control of steel water pollution needs to be based on the whole life cycle of pollution control." Cao Hongbin said. "We do not advocate that environmental protection is not up to standard at the end of a device." As environmental protection requirements become more stringent, the governance process for companies will become longer and longer." Lin Xiao, an associate researcher at the Institute of Process Engineering of the Chinese Academy of Sciences, told reporters that the better combination of environmental protection and the whole production process, so that the production cost may increase by 1 yuan, and the environmental protection cost is reduced by 2 yuan, which is still cost-effective. "Therefore, environmental protection is not only a matter of environmental protection, we need to promote the improvement of the entire production process and system optimization." Lin Xiao said that similar practices in the non-ferrous industry has achieved obvious results. For material processing enterprises, all raw materials are bought with money, and pollutants are generated from raw materials, enterprises have to spend money to buy raw materials, but also spend money to deal with pollutants, which is equivalent to spending two shares of money. "If the unused raw materials and by-products can be recycled, as long as the recovery cost is lower than the material value and environmental protection cost, the enterprise can produce benefits." If we can reduce emissions at the front end and recycle pollutants at the back end through the whole process optimization, we can solve the embarrassment of relying solely on harmless treatment at the end." Lin Xiao said. In addition to the improvement of process technology, Cao Hongbin reminded that enterprises should also pay attention to the improvement of management level, because the level of management will directly affect the governance effect. The operation effect of the same equipment in different enterprises varies greatly, and the management level is an important influencing factor, especially the anaerobic biochemistry and other links need to be refined management. The market demand for high-end technology to increase environmental protection is the catalyst for enterprises to achieve a leap forward, the lack of high-end production capacity, to a certain extent affected the transformation of scientific research results under pressure, the steel industry's elimination of backward and environmental governance has made no small progress. According to Li Xinchuang, the steel industry eliminated 90 million tons of backward production capacity during the "12th Five-Year Plan" period, and about 140 million tons of backward production capacity should be resolved during the "13th Five-Year Plan" period. "We believe that environmental protection is effective, environmental protection is the catalyst for enterprises to achieve a leap, but also the most important starting point to reduce business risks." Enterprises need to change their philosophy, not to treat environmental protection as what you want to do, but now to become what I want to do, and to believe that environmental protection can create value." Lin Xiao said that in the recent period of time, many steel enterprises with a lot of environmental protection debts have been shut down, and the remaining enterprises have improved their benefits because of the increase in steel prices, which is an incentive for enterprises. "The cost of environmental protection should be included in the production cost of enterprises, before some enterprises do not pay attention to environmental protection or steal leakage, now, under the unified environmental protection requirements, everyone is competing who is good technology, who is good management, who is low cost of emissions standards, which is correct and fair." It is precisely because enterprises attach importance to environmental protection that the demand for technology research and development is more targeted and helps to solve the problem. "Only those who understand the business know what the business needs are." Lin Xiao believes that it is necessary to strengthen the communication between enterprises and scientific research institutions, so as to help scientific research institutions find the direction of research and development, help enterprises find external forces that can be used to reduce ineffective research. In recent years, the level of scientific research in our country has been greatly improved, but many scientific research achievements remain in the paper, and the transformation and application are not enough. Lin Xiao analysis said that in China, scientific research institutions generally make research results into a process package, output to the design institute to design blueprints, and then handed over to engineering companies for construction. However, because design institutes and engineering companies have operated as enterprises, they prefer to implement projects with low technology content and high output value through simple replication. "China is used to buying 60% of the functions at 1/3 of the price, and is not willing to buy 150% of the functions at twice the price." This actually leads to the lack of high-end production capacity, which affects the transformation of scientific research results to a certain extent." Still, Mr. Lin is optimistic about the outlook. He believes that with the tightening of environmental standards and industrial restructuring requirements, the market demand for high-end technology will increase. Of course, this is inseparable from the close integration and communication between enterprises and scientific research institutes, enterprises should run more scientific research institutions, and the personnel of scientific research institutions should also understand the needs of enterprises. "Only if everyone walks a little more at every link can the chain be tightened." Share button responsible editor: Tong Zhiwei
Huicong plastic network news: process AIDS, the full name is: processing AIDS. Or processing AIDS. It is an emerging technology that has developed rapidly in the world in recent years. In fact, the development and use of process AIDS, almost in sync with the development of plastic raw materials, have been decades of history. For example, the traditional affordable lubricants stearate (zinc salt, calcium salt, magnesium salt, cadmium salt), as early as the 40's and 50's, has been widely used in plastic processing. Even at present, stearate is still widely used in plastic processing. Therefore, as practitioners of the plastic processing industry, we must first establish a concept, that is, the application of process AIDS has long existed in the traditional plastic processing industry. However, according to the contact with a large number of plastic industry practitioners found that although many people engaged in plastic processing for decades, they do not know that almost every kind of plastic raw materials contain processing AIDS! Therefore, when introducing advanced process AIDS to these senior plastics industry practitioners, most people will ask: "Why use process AIDS?" Or even doubt the need for process AIDS. The use of process AIDS is completely necessary. The simplest analogy is as follows: People must understand that in order for a car to run, gasoline (or some other fuel) must be added. But do not forget that the car must also add various types of lubricating oil, such as: engine oil, gearbox oil, bearing oil and so on. Otherwise, the car will not drive fast, the parts will wear quickly, and there will be a lot of vibration and noise. As with this simple analogy, all kinds of process additives are the "lubricating oil" of plastic melt. (A) The basic classification of plastic industry additives? Plastic industry additives are roughly divided into: (1) functional additives. The characteristic of functional additives is that they have some special function, so that the performance of plastics has been improved in some aspects. For example: antioxidant, UV absorbent, etc. (2) Process additives. The characteristics of process AIDS are that they do not directly improve the performance of plastics, but improve plastic. Be processed to obtain a good quality final product. For example: internal lubricants, external lubricants, etc. (2) What is internal lubricant? The internal lubricant is the lubricant between the carbon chains of plastic molecules. It is used to increase the fluidity of plastic melt to improve the processing performance. For example, LLDPE with Mi(melt flow index)0.8-1.0 has significantly higher tension, puncture resistance and tear resistance than LLDPE with Mi2. However, the LLDPE of Mi1 is difficult to plasticize its melt because of its large melt viscosity and small screw torque. If an internal lubricant is added, the fluidity of the melt is improved and it becomes easy to process. (3) What is external lubricant? External lubricant is a lubricant that reduces the viscosity resistance of plastic melt and steel surface of processing equipment. The plastic melt has good processing characteristics. For example, the LLDPE of Mi1 has great viscous resistance between its melt and the steel surface of the processing equipment. Without external lubricant, it can not be made into a smooth surface film. With the help of external lubricants, high surface smoothness film with high tension, high puncture resistance and high tear resistance can be made. (4) What are the effects of process AIDS? The efficiency of process additives is generally summarized as follows: (1) Reduce the power consumption in the plastic processing process. For example, the PEA series of high-tech process additives can generally increase production by 10-15% under the original power consumption level. That is, save 10-15% of electricity consumption and reduce 10-15% of business administration costs at the same time. (2) Improve the mechanical strength, surface smoothness and surface brightness of plastic products. For example, the PEA series of high-tech process additives can improve the plasticizing efficiency of plastic melt, so the longitudinal and horizontal tension of the film material is correspondingly improved. In addition, it can also improve the microscopic smoothness of the film surface to improve the surface brightness and printing quality. (3) Eliminate tiny crystal points on the surface of the film that are visible to the human eye or can only be observed by a microscope. Eliminate fine printing "white spots". (5) Will the use of process AIDS increase production costs? On the face of it, the use of any additive will have a corresponding additional use cost. However, for process auxiliaries, a large number of facts have proved that the additional cost of using process auxiliaries can not only be offset by the comprehensive benefits of several aspects, such as the reduction in power consumption, or the decrease in enterprise management costs caused by the increase in output, the decline in the rate of waste and defective products, and the use of affordable raw materials. A large number of facts have proved that the use of process additives not only does not increase the cost, but also reduces the total cost of production. (6) The use of process auxiliaries is an important technical measure to increase the profitability of enterprises. A large number of facts have proved that the use of process auxiliaries can improve the quality of products, improve the competitiveness of products, and thus improve the profitability of enterprises. For example: the use of high-tech process aid PEA, because it can make Mi1's high tensile LLDPE smooth processing, therefore, under the same tensile conditions, the plastic bag can be reduced. For plastic bag manufacturers, the price can be increased by ton; For buyers, the number of plastic bags per ton can be increased, and both sides can benefit. Another example: the use of high-tech process additives PEA can significantly improve the fine printing quality of plastic bags, so that plastic bags are more suitable for high-grade product packaging, and the price of plastic bags has been correspondingly improved. Responsible Editor: Wang Ning 12
is located in the magic city - Shanghai. The company is one of the earliest and most professional companies selling metal carboxylate catalyst products such as naphthenate, isooctanate and new decanoate in China. The company has a strong joint research and development team. In the past ten years, our company has stepped into the fast lane of rapid growth, serving more than 100 of the world's leading industry leading enterprises and thousands of small and medium enterprises. Our self-developed series of functional metal compounds can be used as catalyst, accelerator, additive, intermediate initiator, widely used in coating, ink, polyurethane, lubricating oil, plastic polymer, ceramics, electroplating, electronic products, pigments, and other industries. In recent years, the green environmental protection water-based coating drier and high-activity cobalt-free drier products have been well received by customers at home and abroad, and have solved countless difficult and complicated diseases for customers.
Address：No. 555, SuiDe Road, Putuo District, ShanghaiEmail：sales@shcfchem.com
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