Polyvinyl chloride cross linking through sulfhydryl compound

Abstract

The polyvinyl chloride cross linking method through sulfhydryl compound is an improved polyvinyl chloride cross linking method through sulfhydryl compound. The polyvinyl chloride cross linking method is characterized in that the sulfhydryl compound cross linked polyvinyl chloride comprises 100 parts of PVC resin, 40 to 90 parts of plasticizer, 2 to 6 parts of acid absorbent, 3 to 7 parts of dimercapto-triazine compound cross linking agents, 0.2 to 2 parts of composite catalyst, and the components are blended and vulcanized; the PVC resin comprises the following components: 60 wt% to 80wt% of PVC resin with polymerization degree of 950 to 1,050 and 20wt% to 40wt% of PVC resin with polymerization degree of 2,450 to 2,550; the composite catalyst is formed by blending 60wt% to 80wt% of octadecyl alcohol and 20wt% to 40wt% of thiazolium compound. Compared with the prior art, the polyvinyl chloride cross linking method has the advantages that the vulcanization rate is high, the vulcanization time is reduced to 8 minutes from 15 minutes originally, the cross linking degree is high and improved to 85% from 65% originally, the physical and mechanical performances are good, the tensile strength is improved to 20 MPa from 16 MPa originally, and the rebound elasticity and the low temperature flexibility are also improved.

Description

technical field [0001] The invention relates to a cross-linked PVC insulating cable material, in particular to the improvement of mercapto compound cross-linked polyvinyl chloride. Background technique [0002] Polyvinyl chloride (PVC) plastic has good comprehensive mechanical properties, flame retardancy, low price, and can be recycled, so it is widely used in wire and cable insulation or sheathing. PVC as insulation or sheath. However, under the condition of higher service temperature (for example, ≥90°C), the performance of polyvinyl chloride plastic will be greatly reduced, such as the decrease of tensile strength, the increase of deformation, the deterioration of thermal deformation temperature and high temperature dimensional stability, all of which are Seriously affected the expansion of the scope of use. [0003] The cross-linking reaction can form new bonds between the polymer chains, making it a network structure. Therefore, the cross-linking modification of plas...

AI Technical Summary

Problems solved by technology

There is a slow cross-linking speed, which needs to be cross-linked for 15 minutes, and the degree of cross-linking is relatively low, only about 65%, and the performance improvement still cannot meet the high requirements

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