Preparation method of silicone rubber polyurethane thermoplastic elastomer

A thermoplastic elastomer and polyurethane technology, applied in the preparation of silicone rubber polyurethane thermoplastic elastomers, in the field of thermoplastic elastomers, can solve the problems of long mixing time, high cost, poor uniformity, etc. The effect of high efficiency and easy response

Inactive Publication Date: 2018-10-12
MIRACLL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the dynamic vulcanization process cannot solve the problem of poor compatibility between non-polar silicone rubber and polar polyurethane materials, and due to the huge difference in viscosity between silicone rubber and thermoplastic polyurethane elastomer materials, rubber is not easy to shear, Broken to form uniform and tiny dispersed phase particles, eventually resulting in the microscopic morphology of silicone rubber polyurethane thermoplastic vulcanizate is not fine enough, the mechanical properties and elasticity are also poor, and the tensile strength is generally lower than 10Mpa
In addition, in order to fully vulcanize the silicone rubber, the dynamic vulcanization process generally requires a long mixing time in the internal mixer or extruder, generally not less than 6 minutes, not only requires high process stability control, but also long-term thermal shear treatment It will have adverse effects on th

Method used

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  • Preparation method of silicone rubber polyurethane thermoplastic elastomer

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] A kind of preparation of silicone rubber polyurethane thermoplastic elastomer specifically comprises the following steps:

[0031] Step 1: In parts by weight, take the following raw materials: 68.18 parts of polyethylene adipate butanediol ester diol with a molecular weight of 2000 g / mol, 3.66 parts of 1,4-butanediol, diphenylmethane diisocyanate 19.06 parts, liquid methyl silicone rubber 9012A component 5.5 parts, liquid methyl silicone rubber 9012B component 5.5 parts, antioxidant 1010 0.05 parts, light stabilizer 7700.05 parts, lubricant erucamide 0.05 parts and dilaurel 0.05 parts of dibutyltin dilaurate; Among them, liquid methyl silicone rubber 9012 has a viscosity of 6000mP·s at 25°C, and the curing mixing ratio is 1:1. Uniform;

[0032] Step 2: The above-mentioned components are transported to the sprue through a gear pump, mixed and extruded by a twin-screw extruder for continuous reaction. 170°C, 180°C in the sixth, seventh, and eighth zones, 200°C in the ni...

Embodiment 2

[0034] A kind of preparation of silicone rubber polyurethane thermoplastic elastomer specifically comprises the following steps:

[0035] Step 1: In parts by weight, take the following raw materials: 75 parts of polyhexamethylene adipate diol with a molecular weight of 2200 g / mol, 4.25 parts of 1,4-butanediol, 20.75 parts of diphenylmethane diisocyanate, 10 parts of liquid phenyl silicone rubber 9060A component, 5 parts of liquid phenyl silicone rubber 9060B component, 0.03 part of antioxidant 168, 0.08 part of light stabilizer 770, 0.03 part of lubricant ethylene bisoleic acid amide and two 0.03 parts of dibutyltin laurate, in which the viscosity of liquid silicone rubber 9060 at 25°C is 6800mP·s, the curing mixing ratio is 2:1, dibutyltin dilaurate is pre-added to polyhexanediol adipate diol and mixed evenly;

[0036] Step 2: The above-mentioned components are transported to the sprue through a gear pump, mixed and extruded by a twin-screw extruder for continuous reaction. ...

Embodiment 3

[0038] A kind of preparation of silicone rubber polyurethane thermoplastic elastomer specifically comprises the following steps:

[0039] Step 1: In parts by weight, take the following raw materials: 73 parts of polytetrahydrofuran diol with a molecular weight of 2000 g / mol, 4.25 parts of 1,4-butanediol, 22 parts of diphenylmethane diisocyanate, liquid methyl silicone rubber 15 parts of 9017A component, 3 parts of liquid methyl silicone rubber 9017B component, 0.05 part of antioxidant 1010, 0.05 part of light stabilizer 622, 0.05 part of lubricant stearic acid amide and 0.05 part of dibutyltin dilaurate, of which , liquid silicone rubber 9017, viscosity at 25°C is 5000mP·s, curing mixing ratio is 3:1, dibutyltin dilaurate is added to polytetrahydrofuran glycol in advance and mixed evenly;

[0040] Step 2: The above-mentioned components are transported to the sprue through a gear pump, mixed and extruded by a twin-screw extruder for continuous reaction preparation. The temperat...

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Abstract

The invention relates to a silicone rubber polyurethane thermoplastic elastomer and a preparation method thereof. The silicone rubber polyurethane thermoplastic elastomer comprises the following components in parts by weight: 50-80 parts of polyol, 10-30 parts of dual-component liquid organic silicone rubber, 15-40 parts of diisocyanate, 3-10 parts of a chain extender and 0.1-2 parts of an auxiliary agent. The silicone rubber polyurethane thermoplastic elastomer product is synthesized by a one-step reactive extrusion process. The obtained thermoplastic elastomer product has excellent properties of both organosilicone and polyurethane materials, has the advantages of fine micro-morphology structure, smooth touch sense, and excellent mechanical properties and elasticity, and can be widely applied in medical devices, intelligent wearing equipment and other fields.

Description

technical field [0001] The invention relates to a thermoplastic elastomer, in particular to a preparation method of a silicone rubber polyurethane thermoplastic elastomer, which belongs to the field of polymer material processing. Background technique [0002] Silicone rubber refers to the rubber whose main chain is composed of silicon and oxygen atoms alternately, and there are usually two organic groups attached to the silicon atoms. A notable feature of silicone rubber is its excellent temperature resistance. It can maintain excellent stability under high and low temperature conditions. In the high temperature environment above 200 ℃, silicone rubber can still maintain a certain degree of flexibility, resilience and surface hardness, and there is no obvious change in mechanical properties. The weather resistance and aging resistance of silicone rubber are also very outstanding, but the mechanical strength of silicone rubber is poor, and it only has moderate oil resistanc...

Claims

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Application Information

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IPC IPC(8): C08G18/42C08G18/48C08G18/32C08G18/61C08G18/76C08K5/134C08K5/20C08K5/526
CPCC08G18/3206C08G18/4238C08G18/4854C08G18/61C08G18/7671C08K5/1345C08K5/20C08K5/526
Inventor 刘德富宋红玮王黑龙王仁鸿张生
Owner MIRACLL CHEM
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