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Xuzhou Gongle Rubber & Plastic Machinery Co., Ltd. > Plastic extruder > EVA plastic sheet extruder > GL-65EVA (GL) sheet extruder, EVA foam sheet (pictured)

EVA (GL) sheet extruder, EVA foam sheet (pictured)

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  • EVA (GL) sheet extruder, EVA foam sheet (pictured)

  • EVA (GL) sheet extruder, EVA foam sheet (pictured)

  • EVA (GL) sheet extruder, EVA foam sheet (pictured)

  • EVA (GL) sheet extruder, EVA foam sheet (pictured)

Collect Report
price ¥ 198888 ¥ 198000
order amount 1 set 2 sets
  • GL-65 Model GL-65
  • Brand
  • 生产商 Manufacturer nature
  • 徐州市 Xuzhou City

Updated: 2019-12-11 09:27:53 Views: 2504

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Product Brief

EVA (GL) sheet extruder, EVA foam sheet (pictured)
EVA is ethylene vinyl acetate copolymer, it is made by copolymerization of ethylene (E) and vinyl acetate (VA), the English name is: Ethylene Vinyl Acetate, abbreviated as EVA, or E / VAC. The structural formula is: (CH2CH-OH) n. Polymerization methods use high-pressure bulk polymerization (for plastics), solution polymerization (PVC processing aid), emulsion polymerization (binder), suspension polymerization. Ethylene acetate (VA) content higher than 30% adopts emulsion polymerization

Detailed introduction

EVA (GL) sheet extruder, EVA foam sheet (pictured)

EVA is ethylene vinyl acetate copolymer, it is made by copolymerization of ethylene (E) and vinyl acetate (VA), the English name is: Ethylene Vinyl Acetate, abbreviated as EVA, or E / VAC. The structural formula is: (CH2CH-OH) n. Polymerization methods use high-pressure bulk polymerization (for plastics), solution polymerization (PVC processing aid), emulsion polymerization (binder), suspension polymerization. Emulsion polymerization is used for vinyl acetate (VA) content higher than 30%, and high-pressure bulk polymerization is used for low vinyl acetate content. Characteristics and uses of ethylene-vinyl acetate copolymer: 1. Characteristics EVA rubber and plastic products are a new type of environmentally friendly plastic foam material, which has the advantages of good cushioning, shock resistance, heat insulation, moisture resistance, chemical corrosion resistance, etc., and is non-toxic and does not absorb water. EVA rubber and plastic products are designed to be processed and shaped. Its shock resistance is better than traditional foam materials such as polystyrene (foam), and it meets environmental protection requirements. It is a good choice for export products. Compared with shockproof packaging, it can be cut and shaped; because of the large difference in density, it can also be used in a wider range of applications. EVA resin is characterized by good flexibility, rubber-like elasticity, good flexibility at -50 ℃, good transparency and surface gloss, good chemical stability, anti-aging and ozone resistance Good, non-toxic. Good blending with filler, good coloring and molding processability. It is closely related to the vinyl acetate content, molecular weight and melt index. When the melt index (MI) is constant and the content of vinyl acetate (VAC) increases, its elasticity, flexibility, compatibility, transparency, etc. also become higher . ,耐磨性、电绝缘性提高,。 When the VAC content is reduced, the performance is close to polyethylene, the rigidity becomes higher , and the wear resistance and electrical insulation are improved. 变多了 时,则软化点下降,加工性和表面光泽改善但强度会下降,否则,随MI的降低则分子量 ,冲击性能和抗环境应力开裂性能提高。 If the melt index is increased for a certain period of VAC content , the softening point will decrease, the workability and surface gloss will improve but the strength will decrease, otherwise, as the MI decreases, the molecular weight will increase and the impact performance and environmental stress cracking resistance will increase. . ,结晶性和电性能下降,溶于烃类溶剂和油类。 The polarity of acetate increases elasticity and viscosity , crystallinity and electrical properties decrease, and it is soluble in hydrocarbon solvents and oils. 2. Features: Water resistance: closed cell structure, no water absorption, moisture resistance, good water resistance. Corrosion resistance: resistant to seawater, grease, acid, alkali and other chemicals, antibacterial, non-toxic, odorless, and pollution-free. Workability: It is easy to process such as hot pressing, cutting, gluing and laminating. Anti-vibration: high resilience and tensile strength, strong toughness, and good anti-vibration / buffering performance. Thermal insulation: thermal insulation, thermal insulation and low temperature performance are excellent, can withstand severe cold and exposure. Sound insulation: closed cells, good sound insulation.

The EVA foam formula is composed of the following raw materials: main material, filler, foaming agent, bridging agent, foaming accelerator, lubricant.

Obviously the main ingredient is EVA. Of course, in order to improve the physical properties of the product, some other materials can be added appropriately, such as rubber, POE, etc., and even a little TPR can be added to strengthen certain physical properties. As for EVA, the main indicator is the VA content, and its level is directly related to almost all properties of EVA foam products. of course. Some can foam only with PE. The specific material used depends on the product requirements. -T Sia w zV / Q: r filler, currently generally use calcium carbonate or talc. 变多了产品刚性等等,还能起一点导热的作用。 Its purpose is to reduce costs, increase product rigidity, etc., but also play a role in heat conduction. Generally, the particle size is used as the quality index (of course, the water content is also one aspect), for example, 120 mesh, 400 mesh, etc. In principle, the finer the better, and of course the price will be higher. The large dosage is 40Phr (the percentage of the main material) in the formulation I have seen. Generally, AC series foaming agents are used, such as AC-3000H. AC series foaming agents are high-temperature foaming agents. The decomposition temperature is over 220 degrees. There are also low-temperature blowing agents, such as AD-300, with a decomposition temperature of 140 degrees, and medium-temperature blowing agents. Because the price difference is not large, and the high-temperature foaming agent will be relatively stable, so many old EVAs are now using high-temperature ones, and some are used together. The dosage of AC depends on the specific magnification. As a bridging agent, DCP is now used mostly, and TAIC, PL400, etc. were also used before. The half-life of DCP is 1 minute at 180 degrees and 10 minutes at 130 degrees. Therefore, in general training, the temperature should be controlled below 120 degrees as much as possible. Some products have odor requirements, you can use another cross-linking agent BIPB, which is generally used in conjunction with TAIC. The dosage of DCP is generally 0.5-0.6Phr in flat foam and small in-mold foam, and 0.8-1.0Phr in injection foam. Of course, there are appropriate additions and subtractions, and there are also different usages. There are two types of foaming accelerators used now, zinc oxide powder and zinc stearate powder. In the past, we also used these two combinations, and now only use zinc oxide. A single one can also achieve results, and the stability of the product may be better. Zinc oxide can reduce the decomposition temperature of AC to about 160 degrees, which is convenient for production. We have a consensus here that the general amount of zinc oxide does not exceed 0.2Phr, and excessive product shrinkage will be relatively larger. Of course, if it is too little, the foaming speed is too slow, so it should not be less than 1.0hr / lubricant, stearic acid is generally used. In fact, it has little effect, that is, it does not stick to the machine when training. It is not good to use more, because it can reduce the friction between the points, so that most physical properties are reduced. 0.5Phr is recommended. We will introduce the addition of auxiliary materials in EVA foam later. EVA (GL) sheet extruder, EVA foam sheet (pictured)

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