What are the uses and requirements of pvc processing AIDS?

The pure resin of PVC is easy to decompose, with poor fluidity, low impact strength and poor weather resistance. Various auxiliary materials need to be added during the processing to improve its performance. Such as lubricants, heat stabilizers, impact modifiers, processing aids, etc.

During the development and application of processing AIDS, they can be roughly divided into the following categories according to product components: methyl methacrylate (MMA)/ acrylate * * * polymer, MMA/ styrene * * polymer, acrylonitrile/styrene and so on. At present, MMA/ acrylate polymer is the most widely used and has the best effect.

classify

1) classified by product composition

2) Classification by relative molecular weight

According to different relative molecular weights, processing AIDS have different functions. Processing AIDS with relative molecular weight of 500- 1.5 million are widely used in the processing of ordinary products, such as: ACR-20 1, 30 1, 40 1 and so on. Processing AIDS with relative molecular weight greater than 6.5438+0.5 million are widely used in blow molding and rigid PVC foamed products, such as ACR-530.

function

The main functions of processing AIDS are:

1) accelerates the plasticizing process of PVC.

2) Improve the rheological properties of thermoplastic melt.

3) Improve the mechanical properties of the melt in the thermoelastic state.

4) Improve the comprehensive functions such as product appearance quality.

Although the addition of processing AIDS is very small, it is very important to improve the processability of PVC.