Introduction of 8 kinds of plastic modification methods

1. Filling modification

Method: Resin + coupling agent + inorganic minerals

Commonly used materials.

a). Chromium complex coupling agent, silane coupling agent (KH550, 570, etc.), titanate coupling agent, other;

b). Heavy calcium, talc, mica, barium sulfate, silica clay, glass beads, montmorillonite, etc.

Effects

a). Reduce cost;

b). Increase hardness, reduce shrinkage, increase heat deflection temperature;

c). Influence on fluidity.
 

2. Reinforcement modification

Method: Resin + material with certain aspect ratio + coupling agent

Common materials: alkali-free glass fiber, whisker, carbon fiber

Effects

a). Reduce cost;

b). Greatly improve the strength, while increasing the hardness, reducing shrinkage, and increasing the heat deflection temperature;

c). Orientation, poor flowability.
 

3. Toughening modification

Method: resin + toughening agent

Commonly used materials: POE, PE, MBS, SEBS, EPDM, EVA, other rubber toughening agents

Effect: Make the material flexible and elastic, avoid brittle fracture, even bend at will, but the strength will be reduced.
 

4. Flame-retardant and smoke-resistant modification

Method.

Resin + main flame retardant + auxiliary flame retardant + smoke suppressant + anti-drip agent .....

Commonly used materials.

▪ Decabromodiphenyl ether DBDPO - bromine content of 85%, the best flame retardant effect, not environmentally friendly, precipitation serious;

▪ Decabromodiphenyl ethers - 83% bromine, better flame retardant, environmental protection, precipitation, better thermal stability than DBDPO;

▪ Brominated epoxy BER - bromine content 53%, add more, environmental protection, no precipitation, weight loss 1% at 330℃;

▪ Brominated polystyrene BPS--bromine content 60%, thermal decomposition temperature >310℃, environmental protection, less domestic do well;

▪ Red phosphorus - general microencapsulation, flame retardant, no frost, no migration, high CTI value, very little impact on the mechanical properties of the material, seriously affect the color matching;

▪ Magnesium hydroxide - decomposition temperature 340 ~ 390 ℃, add a large amount, has a great impact on the performance, generally to do fine and surface treatment;

▪ Aluminum hydroxide ATH - dehydration temperature 200 ~ 300 ℃, the addition of a large amount, the performance has a great impact.
 

5. Heat-resistant modification

Method: Resin + mineral filling

Commonly used materials: calcium carbonate, talc, mica, glass beads, glass fiber, etc. (generally can be improved by 2 ~ 3 times)

6 Antistatic, conductive modification

Method: Resin + antistatic agent/conductive material

Commonly used materials.

a). Organic salts (carb 190, Colin 93P, permanent antistatic agent P18)

b). Conductive masterbatch, conductive material, polypyrrole (PPy), polyaniline (PAn), polythiophene (PTH)
 

7. Anti-aging modification

Method: Resin + antioxidant/light stabilizer

Common materials: 1010, 168, 1098, 944, 770, carbon black, titanium dioxide
 

8. Alloying modification

Using physical blending or chemical grafting methods, two or more resins are compounded to complement each other and make the overall material achieve high performance, functionalization, and specialization. Alloying modification generally requires the addition of compatibilizers, and common alloys include PC/ABS, PBT/PA, PBT/PC, PE/PP, etc.