Impact modifiers used in rigid PVC products

Polyvinyl chloride (PVC) is one kind of general thermoplastic with excellent properties and it is one of the most productive plastic varieties.

However, PVC resin is one kind of brittle material, and continuous glass phase can not prevent the severe expansion of cracks under the action of stress, and finally form a notch and crack rupture, so its impact resistance is poor.

In processing, the most common way to solve this problem is to mix impact modifier technology in PVC polymer, which can effectively toughen brittle rigid PVC resin, make PVC resin maintain high modulus and high rigidity, and greatly improve its impact strength.

At present, the most commonly used PVC impact modifiers are chlorinated polyethylene (CPE), acrylic impact modifier (AIM), acetate-vinyl acetate copolymer (EVA), methyl methacrylate - butadiene - styrene terpolymer (MBS) and acrylonitrile - butadiene - styrene copolymer (ABS).

CPE has aging resistance, fire resistance, cold resistance, weather resistance. It's one kind of impact modifier which has better comprehensive performances and higher cost performance. Then it becomes one of the most widely used impact modifier.

AIM is one kind of copolymer with the structure of core-shell which makes it high impact resistance. It also has excellent weather resistance. So it is usually used in outdoor application, such as PVC profile, PVC pipe and so on.

MBS has excellent impact resistance owing to its much higher rubber content. It mainly improves the impact strength of indoor applications, especially for PVC finished products which have the super-high impact strength needs, such as credit card and PVC pressure pipe etc.

The customers can choose the proper one according to their special requirement. If you are not sure which impact modifier to use, you can contact us and we will help you choose the right product: info@pvcadd.com.