The significance of rubber blending, the purpose of using various rubber and plastic and rubber

Rubber and plastic blending is that rubber and plastic (or rubber) are mixed together through specific processing means and methods, so that the resulting blend material has the dual characteristics of rubber and plastic (or other rubber). The two phases in the blend still maintain their respective characteristics, and no new substances are generated after blending, but the combination is formed at the interface of the two phases, reflecting the complementary properties of each other, also known as "polymer alloy".

Purpose of rubber blending:

1, improve the performance of rubber;

2, improve the process performance of rubber;

3, reduce costs;

4, determine a reasonable mixing process;

5. Develop new polymer materials; Common rubber blending modification methods are: solution blending, emulsion blending, mechanical blending (powder blending, melt blending, mechanochemical blending)

The significance of rubber blending: improve the process performance, use performance and technical and economic performance. More than 70% of rubber is processed and used in the form of rubber and rubber or rubber and plastic.

Content of rubber blend: compatibility The ability to form a homogeneous body: thermodynamic compatibility, process compatibility

The morphology and structure of the blend: continuous phase, dispersed phase, interface

Distribution of the compound in the blend: distribution of vulcanization additives, fillers, co-crosslinking and physical properties

Process compatibility of rubber: Mixing thermodynamic incompatible systems by mechanical methods or other conditions can obtain a sufficiently stable blend that constitutes a heterogeneous form in the microscopic region, but still maintains its homogeneity at the macro level.

Process compatibility of rubber

By mixing thermodynamically incompatible systems by mechanical methods or other conditions, a sufficiently stable blend can be obtained that constitutes a heterogeneous form in the microscopic region, but still maintains its homogeneity at the macro level.

Influencing factors of polymer blending:

Mixing process conditions: time, strength, roll temperature, processing method

Formula composition: raw rubber, blending ratio, compatibilizer, processing aid

[Typical rubber and plastic examples]

First, PVC and rubber blend:

Rubber/Plastic alloy (NBR/PVC) : Main properties: The main advantage of rubber/plastic alloy rubber is that it has the ozone resistance of PVC and the oil resistance and crosslinking of nitrile rubber.

NBR/PVC compared with NBR, the strength, flame retardant, wear resistance, solvent resistance, ozone cracking resistance are improved, the processing performance and foam performance have been significantly improved;

Compared with pure nitrile butadiene rubber, the blend has the following characteristics: significantly improved ozone resistance and weathering resistance. Improved tensile strength, constant elongation stress, tear resistance, heat resistance and fire resistance; Improved oil resistance, fuel resistance and chemical resistance. The extrusion and calendering properties are improved, and the rubber material is not easy to self-sulfur, which enhances the storage stability. Can be arbitrarily colored, make brilliant products.

Application: NV rubber and plastic alloy rubber is mainly used in wire and cable sheath, oil pipe and fuel pipe outer layer rubber, high pressure, ultra-high pressure hose inner layer rubber/outer layer rubber, textile industry rubber roller/skin knot, elevator handrail belt/printing/printing roller, ring, automotive molding parts, aviation rubber products, rubber plate, tape, conveyor belt, seals, sealing strip safety boots and protective coating and other fields.

Models: According to the NBR/PVC ratio: 70:30, 60:40, 50:50, 40:60 various models, Mooney viscosity between 55-65.

Second, PE and rubber blend:

The blending of PE and NR and other rubber has good effect.

Third, high styrene and rubber blend:

High styrene and rubber blend material, high hardness, high strength, wear resistance, easy processing, rolling, pressing out of the semi-finished product surface smooth.

EPDM/PP (EPDM/PP)

Excellent weather resistance, ozone resistance, ultraviolet resistance and good high temperature resistance, impact resistance, its oil resistance and solvent resistance and general neoprene rubber comparable, can be processed with ordinary thermoplastic processing equipment, with simple processing, low cost, continuous production and recycling advantages.

Five, nitrile rubber NBR+ phenolic resin

Scale: Any

Objective: To improve the viscosity, hardness, wear resistance and strength of NBR

Products: Gasket, lining

【 Use all kinds of rubber 】

First, natural rubber + butadiene rubber and use

NR+BR

Ratio: 75 ~ 50/25 ~ 50

Objective: To increase the vulcanization temperature, improve the heat resistance, cold resistance, elasticity and wear resistance

Products: Conveyor belt, rubber shoes

Second, natural rubber + styrene butadiene rubber and use

NR+SBR

Scale: Any

Objective: To improve the wear resistance of NR to improve the ozone cracking resistance of tread

Products: Tires and other products

Three, styrene butadiene rubber + butadiene rubber

SBR+BR

Scale: Any

Objective: To improve wear resistance, elasticity and cold resistance

Products: Tread

Four, ethylene propylene rubber + butyl rubber

EPDM+IIR

The ratio: 50/50

Objective: To improve tear resistance, heat resistance and ozone resistance; Improve tread wear resistance

Products: Tread, inner tube, etc

Five, ethylene propylene rubber + chlorinated butyl rubber

EPDM+CIIR

The ratio: 50/50

Objective: To improve ozone resistance

Products: Tire side

Six, butadiene rubber + ethylene propylene rubber

Butadiene rubber +EPDM

Scale: Any

Objective: To improve the heat resistance, ozone resistance and chemical resistance

Products: Tread

Seven, nitrile rubber + natural rubber or styrene butadiene rubber

NBR+NR or SBR

Proportion: NR or SBR≤40%

Objective: To improve the cold resistance and reduce the cost of NBR, but other properties of NBR are slightly decreased

Products: oil resistant sole, leather bowl

Eight, nitrile rubber + neoprene rubber

NBR+CR

Scale: Any

Objective: To improve weather resistance and ozone resistance

Products: outdoor oil resistant products

Nine, nitrile rubber + ethylene propylene rubber

NBR+EPDM

Objective: To improve weather resistance and ozone resistance

10. Neoprene + natural rubber

CR+NR

The ratio: 80/20

Objective: To improve the technological properties of CR

Products: Conveyor belt or covering glue

11, neoprene rubber + nitrile rubber

CR+NBR

Scale: Any

Objective: To improve the adhesive roll, extrusion, calendering and oil resistance of CR

12. Neoprene + butadiene rubber

CR+BR

Ratio: 90 ~ 60/10 ~ 40

Objective: To improve the cold resistance, wear resistance and elasticity of CR, and significantly improve the process properties of extrusion, calendering, sticking roll and coke burning

Products: Tape, shock absorbing rubber