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Discussion on the Problem of Plasticizer

Jun. 20, 2020
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Green speciality chemicals companies share this article for you.

Q: Have you ever found anti-plasticizing phenomena when making PVC rigid products, and what kind of plasticizer is prone to anti-plasticizing effect?

Answer: Anti-plasticizer is a substance with two or more aromatic rings close together, with polarity and high rigidity, such as chlorinated biphenyl, chlorinated terphenyl, poly(phenyl glycol), etc. If the polycarbonate contains 20% of this substance, you can get transparent, hard, tough, self-extinguishing, electrical properties and stress cracking resistance are good products. Low concentration of dimethyldiaminobiphenyl can also produce this effect on PVC. Plasticizers with strong polarity have a significant anti-plasticizing effect.

Q: When a small amount of plasticizer is added to hard products, the product will become yellow and brittle in the later stage. Is this anti-plasticization?

A: In order to promote the plasticization and flow of PVC, many factories now use DOP to replace ACR. They will add a small amount of DOP (less than 5 parts) to the hard products. The surface seems to be better processed. In fact, the overall performance is much lower. , Especially the heat distortion temperature, and the longer the use time later, the product will become yellow and brittle.

What makes sense is that the oil used for rigid PVC products is to lower the glass transition temperature and Vicat.

Yes, but many manufacturers of rigid PVC are using it. I have met some engineers or masters. They said that I can use DOP to get plasticity and fluidity. Why use ACR? They understood plasticizers as additives to promote rigid PVC plasticization. It is undeniable that adding plasticizers can improve the processing performance of rigid PVC, indicating that the plasticization is good (actually soaking with acetone solution or dichloromethane solution can show that the plasticization is not good), even for high calcium formulas, The screw is better. But these are based on the premise of sacrificing the temperature resistance, weather resistance, and low temperature brittleness of the product.

Q: It seems that when the amount of plasticizer such as liquid is small, it has anti-plasticizing effect?

Answer: It seems that there is no such phenomenon. This thing mainly affects the crystallinity of PVC. At least DOP should not be there. I have done it repeatedly. I haven't tried DOP, DINP DOTP ATBC DINCH, I have tried it, plus 5 parts, the processing performance is good, and the impact resistance is greatly reduced.

Green Speciality Chemicals Companies

Green Speciality Chemicals Companies

Plasticizers currently commonly used are:

1

Epoxy plasticizer

Epoxy soybean oil

Epoxy linseed oil

Epoxy fatty acid alkyl ester

effect:

It has both thermal stability and plasticization function for PVC resin

2

Heat-resistant plasticizer

Trioctyl trimellitate

Tri-n-octyl trimellitate

Triisodecyl trimellitate

Tetraoctyl pyromellitic acid

P-Benzene (can replace DOP)

effect:

Excellent heat resistance

Good cold resistance

Earth volatility

Excellent anti-aging properties

Suitable for high temperature wire and cable, car seat cushion, special transparent hose, sealing products, etc.

3

Polyester plasticizer

Adipic acid polyester

Adipic acid polyester without DOA

effect:

It has excellent resistance to oil and solvent extraction. Very volatile, with good anti-aging properties.

It is suitable for soft PVC, high temperature wire and cable materials, sealing materials and other materials with high oil extraction resistance requirements.

Can also be used for rubber.

4

Plasticizer for rubber

Adipate

Polyetherester

effect:

Has good cold resistance and anti-aging stability

Suitable for automotive pipes, water hoses, conveyor belts and key functional parts

5. Regarding the taste of plasticizer, the following odor is less

Terephthalate.

Polyester.

Polyol lipids


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