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Many compounds in plastics have unpleasant odors, including amines, phenols, mercaptans, peroxides, benzene, aldehydes, ketones and some plasticizers and flame retardants. Solvents used in plastic processing also emit a strong chemical odor. What should I do if engineering plastics have smell? Engineering plastics manufacturers will help you learn the following seven methods.

Solutions to common problems of engineering plastics manufacturers

Use low odor substitutes to replace those unpleasant extenders and reduce the amount of residual monomers in the molding process. Gas adsorbent and antibacterial agent are added to the plastic bag to avoid unpleasant odor due to the effect of bacteria and fungi. Solvent extraction and waste gas can reduce the residual odor in the plastic recovery process.

1. Relatively pure resin for raw materials

In many plastics, especially in PVC, styrene, poly (ethyl acetate) and acrylate, the residual monomer will produce unpleasant odor, and the use of odorless resin is also very effective.

2. Aromatics addition

Aromatics can not eliminate these odors, but can play a shielding effect. The method can be applied to polyethylene, polypropylene and polyolefin thermoplastic elastomers, and the processing methods include injection molding, extrusion or blow molding.

3. Selection of additives

Many extenders, such as amine extenders, usually have strong pungent odor in production. This problem can be effectively solved by substituting other additives with the same effect. For example, polyhydroxy compounds are used to replace tertiary amine catalysts, zinc stabilizers are used to replace phenol stabilizers for PVC base or calendering, and plant extracts, such as erucic acid and oleic acid, have a much smaller odor than amine lubricants made from animal extracts (used for polyolefin and styrene food packaging materials).

4. Adsorbent

If a small amount of zeolite (aluminum silicate adsorbent) is filled in the polymer, the odor of the material can be removed. Molecular adsorbents have been successfully applied to polyolefin extrusion tubes, injection molding and extrusion blow molding containers, barrier packaging materials, extrusion packaging materials and sealing polymer and plastic products.

5. Application of antibacterial agent

The addition of antibacterial agents in the molding process can not only reduce the odor, but also delay the appearance aging, discoloration and brittleness of products. The commonly used antibacterial agents are triclosan, parathion isothiazolinone (OIT).

6. Use desorption method

The desorption method is to put the plastic into odor adsorbents such as activated carbon and high surface area silicate. The vacuum treatment environment can accelerate the desorption process, and the treatment of plastic particles with special detergent solution can also help to remove the odor. Generally speaking, these detergents are aqueous or alkaline solutions containing surfactants. These detergents can effectively remove vinyl chloride monomer, styrene, acrylate, acrylic monomer and unsaturated hydrocarbon.

7. Disposal of recycled goods

Bad smell often occurs in waste plastics. Most recovered plastics, such as HDPE, PP, PVC and pet, are washed in aqueous solution to remove pollutants, but the smell adsorbed inside the plastics will remain.

Source: Jiangmen engineering plastics http://xrtsm.com.cn/