Polyvinyl chloride (PVC) mixture with high elongation at break

Abstract

The invention provides a polyvinyl chloride (PVC) mixture which comprises the following components in parts by weight: (a) 100 parts of PVC resin, (b) 5-30 parts of low-temperature toughening modifier, (c) 0.5-5 parts of stabilizer, (d) 0-50 parts of filler, (e) 0-50 parts of wood meal, (f) 0-10 parts of acrylic polymer, (g) 0-20 parts of anti-shock modifier, (h) 0-5 parts of lubricant and (i) 0-10 parts of pigment. The low-temperature toughening modifier is rubber powder of which the elongation at break is 1000-1600% and the weight percent of chlorine is at least 10%. The elongation at break of the PVC mixture is greatly enhanced, thereby basically overcoming the defect of low elongation at break of the PVC product, greatly widening the application range of PVC and enhancing the industrial competitive power of PVC.

Description

technical field [0001] The invention relates to a polyvinyl chloride mixture, in particular to a polyvinyl chloride mixture with high elongation and excellent toughness, processability and weather resistance. Background technique [0002] Generally speaking, polyvinyl chloride (PVC) resin has the following disadvantages: 1. Poor processability; 2. Poor low-temperature impact strength; 3. Poor thermal stability; 4. Poor low-temperature toughness. People have invented a variety of methods to improve the shortcomings of PVC, for example: people have invented processing aids to improve the processing performance of PVC; invented impact modifiers to improve the low temperature impact performance of PVC; invented heat stabilizers to improve PVC thermal stability, but the low temperature toughness of PVC has not been resolved. The toughness of PVC has become a major obstacle to the development of PVC. For example, in the field of water supply pipes, PVC pipes are gradually replace...

AI Technical Summary

Problems solved by technology

[0002] Generally speaking, polyvinyl chloride (PVC) resin has the following disadvantages: 1. Poor processability; 2. Poor low temperature impact strength; 3. Poor thermal stability; 4. Poor low temperature toughness

People have invented a variety of methods to improve the shortcomings of PVC, for example: people have invented processing aids to improve the processing performance of PVC; invented impact modifiers to improve the low temperature impact performance of PVC; invented heat stabilizers to improve PVC thermal stability, but the low temperature toughness of PVC has not been resolved

The reason why PVC products are difficult to replace wood is because PVC products are prone to nail cracking

Secondly, the reason why PVC doors and windows are prone to weld fillet cracking is also because of the low elongation at break and poor toughness of PVC.

[0003] For a long time, there has been a big misunderstanding in the field of PVC modification. It is mistakenly believed that the notched impact strength and toughness of PVC are the same, and that the impact strength of PVC is improved, and the toughness of PVC is also improved, so people invented chlorination. Polyvinyl chloride, acrylate impact modifier (impact ACR), methyl methacrylate / styrene / butadiene (MBS) and other impact modifiers to improve the impact strength and toughness of PVC, the above Impact modifiers, especially impact-resistant ACR and MBS, can greatly increase the notched impact strength of PVC, but it is difficult to effectively improve the toughness of PVC, making it difficult to have the same or close toughness as polyethylene, and the same toughness as wood. The nail-holding force is due to the fact that impact strength and toughness are two concepts. The essence of impact strength is the ability of a material to convert impact energy into heat energy when it is impacted, while toughness is when the material is subjected to stress or internal stress. The ability to produce deformation and relieve stress

Images