Formulation Design of Plastic Elastomer Modification

Formulation Design of Plastics Elastomers

Plastics elastomers are polyolefins combined with elastomeric polymers blocks, which exhibit both thermoplasticity and elasticity. As a kind of plastic material with rubber properties, plastics elastomers have excellent physical and mechanical properties, such as good environmental stress cracking resistance, high mechanical strength and good flexural fatigue resistance. In addition, plastics elastomer materials have good processability at low temperature, low density and low cost, which can effectively improve product performance and reduce cost. Therefore, plastics elastomer materials have been increasingly used in many aspects.

The formulation design of elastomers includes four steps: selecting raw materials, selecting comprehensive additives, selecting masterbatch, and controlling viscosity.

1. Selection of raw materials:

Usually, the raw material for plastic elastomers should be selected according to the application environment and performance requirements of products. Generally speaking, the main component of plastics elastomers is polyolefins, such as the light linear low-density polyethylene (L-LLDPE), and then the elastomeric polymer blocks such as butadiene, isoprene and styrene, and ethylene-vinyl acetate copolymer (EVA).

2. Selection of Comprehensive Additives:

Comprehensive additives should be selected according to the specific application environment. For example, high-grade antistatic agents, mould release agents, foaming agents and oils or waxes can be added in the production of high performance plastic products. Antistatic agents can be selected according to the application of the product and the working environment, including ammonia-containing antistatic agents and non-ammonia-containing antistatic agents. Mould release agents can be selected according to the specific application process. Generally, silicone glycol is used for injection moulding, and soluble-set is used for extrusion. Foaming agents for plastic products should be selected according to the desired void ratio and product density, including physical foaming agents and chemical foaming agents. Oils and waxes are also used in plastic products, and should be selected according to the specific application environment and product performance requirements.

3. Selection of Masterbatch:

In order to improve the performance stability and appearance quality of products, appropriate stabilizers, lubricants, UV absorbers, light stabilizers, color materials, flame retardants and other physical additives are required in the processing of plastics elastomer. Therefore, corresponding masterbatch should be selected to make use of its advantages such as good compatibility and homogeneous dispersion.

4. Control of viscosity:

In the control of viscosity, the most important thing is to adjust the process parameters of the whole melt compression process. Generally, the gear pump pressure, feeding temperature and feeding speed should be adjusted to make the product structure more uniform and reduce processing cost. The selection of screw design, screw speed, backflow zone and the adjustment of the plasticizing and cooling system also affect the viscosity of the product.

In summary, when formulating the plastic elastomer, the raw material should be selected according to the application and performance requirements, a variety of comprehensive additives should be added according to the product environment, and suitable masterbatch and process parameters should be chosen to adjust the product viscosity.

Formulation Design of Plastic Elastic Modification

Plastic elastic modification is a kind of plastic modification technology, which uses chemical methods to introduce a certain amount of plastic elastic modifier into the original plastic body to modify its chemical structure, and meanwhile changes its physical performance. The purpose is to improve the performance of the plastic.

The general formulation of plastic elastic modification mainly includes two parts: polyolefin modifier and crosslinked modifier. The polyolefin modifier refers to the polyolefin material with certain functionality, which can form a triple arm star structure through intramolecular crosslinking, thereby increasing the elasticity of the modified plastic. Crosslinked modifier mainly includes polyether polyamide and polyether polyol, which can form a three-dimensional space network structure after reaction in the polymer.

In addition to the polyolefin and crosslinked modifiers, the formula of plastic elastic modification also needs to add reinforcing agent, plasticizer and other auxiliary materials according to the actual needs. The selection of reinforcing agents, plasticizers and other auxiliary materials should also pay attention to compatibility, comprehensive cost performance and other factors.

It should be noted that the ratio of polyolefin modifier, crosslinked modifier and other auxiliary materials in the plastic elastic modification formula should be adjusted according to the actual needs, and the process parameters should also be tuned to obtain the best elastic performance of the modified plastic.