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