PVC PASTE RESIN
Plastic Chemical: PVC PASTE RESIN is extensively used for coated cloth, model, foaming and is a high-quality raw material in producing foam floor, wall paper, leather, soft and hard foam plastic for sound insulation and heat insulation, toy, glove, paperboard coat, conveying belt, fitting of car, adhesive and seal gum for car coated glass and so on.
PVC PASTE RESIN
Average degree of polymerization
Average grain diameter(µm)
Brookfield Viscosity(Pa.s 2hrs/24hrs)
PVC PASTE RESIN Uses
This product is extensively used for coated cloth, model, foaming and is a high-quality raw material in producing foam floor, wall paper, leather, soft and hard foam plastic for sound insulation and heat insulation, toy, glove, paperboard coat, conveying belt, fitting of car, adhesive and seal gum for car coated glass and so on.
PVC PASTE RESIN Packing
25 kg/plastic woven bag
PVC PASTE RESIN Production
The solubility parameter of polyvinyl chloride (pvc) is about 9.7, which is a non-polar solvent with low solubility resistance parameter. It is soluble in certain ketones, esters and chlorinated hydrocarbons a because of its large amount of chlorine in the molecule, which makes it have good flame retardancy. However, due to the introduction of plasticizers, flame retardancy is reduced.
X-ray studies have shown that polyvinyl chloride produced by the usual method is amorphous, with little crystallinity (about 5%). Different types of polyvinyl chloride, in addition to molecular weight, are also derived from molecular weight distribution, particle size and The distribution, the number and type of impurities are determined.
First, the specifications and characteristics of the emulsion method PVC resin.
The emulsion method polyvinyl chloride is a very fine particle resin having a size of between 0.2 and 2 micrometers, and a generally common particle size is between 1 and 2 micrometers. When it is mixed with a plasticizer, it can be suspended therein to form a paste-like dispersion, so that the emulsion resin is also referred to as a paste resin. In addition to its use as a production of PVC artificial leather, it can also be used in processing methods such as impregnation and slush molding.
(1) Main specifications of emulsion method polyvinyl chloride resin
1. The average molecular weight is composed of polyvinyl chloride resins which are composed of polyvinyl chloride having different molecular weights. It has a great influence on the processing of PVC artificial leather and the performance of the product. Therefore, the average molecular weight of the resin is an important indicator when selecting the resin. 9 The average molecular number is the most representative. The current method is to determine the polyvinyl chloride resin. A method of viscosity of a dilute solution formed in a solvent. Expressed in terms of absolute viscosity and K value. In our country, a method for determining the absolute viscosity of a dichloroethane solution of a 1% polyvinyl chloride resin is used to indicate the average molecular weight of the resin. Suitable for the production of artificial leather, the average molecular weight is 58000 ~ 64000 (number average molecular weight). The corresponding K value is 67~70, and the absolute viscosity (1%=chloroethane solution.20C) is about 1.7~1.90.
2. Particle size (fineness)
The particle size of the emulsion method of polyvinyl chloride has an effect on the production of artificial leather. The particle size is measured by sieving through a sieve of a certain size, and the proportion of the particle size of the sieve resin is used. In the actual sieve analysis, it is expressed by the proportion of the weight of the sieve resin.
3. Volatile content
In the emulsion method polyvinyl chloride resin, the volatile matter is mainly water, and there are too many volatile substances in the resin such as residual monomers, emulsifiers, chain transfer agents, etc., and bubbles and defects are easily generated in the artificial leather production, which affects the polychlorinated chlorine. The appearance quality of vinyl artificial leather. The general content is below 1%.
Pasting property refers to the ability of the emulsion polyvinyl chloride resin to absorb plasticizer when mixed with a plasticizer, that is, a certain amount of resin mixed with plasticizer to form a plasticizer required for forming a paste. the amount. It is related to the size, surface structure and absorption properties of the resin particles.
5. Thermal stability
Due to the control of the polymerization temperature, the residual of the addition in the resin and the presence of a trace amount of chlorine during the polymerization of the emulsion method polyvinyl chloride resin, an unstable factor is formed in the resin, which swells its stability. When the resin is heated during processing, partial decomposition of the resin is caused. The thermal decomposition temperature is usually used to measure the thermal stability of the resin. When the thermal decomposition temperature is low, the resin is easily decomposed at a lower temperature.