Bi-component liquid silicone rubber and preparation method thereof

Abstract

The invention belongs to the field of silicone rubber, and particularly relates to bi-component liquid silicone rubber and a preparation method thereof. The bi-component liquid silicone rubber comprises base rubber, a cross-linking agent, a catalytic agent and a silane coupling agent, and is characterized in that hydroxyl-terminated polysiloxane is used as the base rubber; tetraethyl orthosilicate is used as the cross-linking agent; organic tin is used as the catalytic agent; amino propyl triethoxy silane is used as the silane coupling agent; and the other components are fillers. The bi-component liquid silicone rubber comprises 90 to 120 parts of hydroxyl-terminated polysiloxane, 5 to 12 parts of tetraethyl orthosilicate, 1 to 3 parts of organic tin, 2 to 5 parts of amino propyl triethoxy silane, 20 to 40 parts of white carbon black, 40 to 60 parts of aluminum hydroxide and 40 to 60 parts of iron red. The preparation method comprises the steps as follows: (1) the preparation of a component A: needed raw materials are evenly mixed in a kneader and milled, stirred, vacuumized, dried, cooled, and the like, and then the component A is obtained; (2) the preparation of a component B: needed raw materials are evenly mixed and then the component B is obtained; and (3) the concoction of a rubber compound: the rubber compound can be obtained only by mixing the component A and the component B at a mass ratio of 100:4 to 7. The bi-component liquid silicone rubber has the characteristics of good fluidity, high strength, good flame retardance, high-temperature erosion resistance, and the like.

Description

technical field

[0001] The invention belongs to the field of silicone rubber, in particular to a two-component liquid silicone rubber and a preparation method thereof.

[0002] Background technique

[0003] Silicone rubber is widely used in electronic appliances due to its excellent electrical insulation, arc resistance, corona resistance, water resistance, ozone resistance, weather aging resistance, high and low temperature resistance, and can be used in the temperature range of -60~200 °C. , automotive, aerospace, mechanical construction, textile, chemical, light industry printing, health and other industries as insulation, packaging, caulking, sealing, moisture-proof, shock-proof and roller materials. In addition, because silicone rubber has excellent mold release properties, it is widely used as a soft mold material for the reproduction and manufacture of cultural relics, handicrafts, toys, artificial leather, electronic appliances, instruments, meters and mechanical pa...

Examples

Embodiment 1

[0030] Select 90 parts of hydroxyl-terminated polysiloxane, 20 parts of fumed silica pretreated by trifunctional siloxane and D4, 40 parts of aluminum hydroxide, pretreated by trifunctional siloxane and D4 40 parts of high-temperature-resistant iron red, mix evenly in the kneader, transfer the rubber material to the three-roll machine for grinding, and then transfer to the kneader to heat up and stir, the temperature of the rubber material is 150 ° C, the vacuum degree = 0.085 Mpa. , vacuum-dried for 3 hours, sealed and cooled to room temperature. Transfer the cooled sizing material to a three-roller mill and grind it evenly to obtain component A product.

[0031] Mix 5 parts of tetraethyl orthosilicate, 1 part of organic tin carboxylate and 2 parts of aminopropyltriethoxysilane to obtain component B, which is sealed for use; mix A:B=100:4 to prepare .

[0032] Wherein, the pretreatment of trifunctional siloxane and D4 is to pass the steam of trifunctional siloxane and D4 in...

Embodiment 2

[0034] Select 110 parts of hydroxyl-terminated polysiloxane, 30 parts of fumed silica pretreated by trifunctional siloxane and D4, 50 parts of aluminum hydroxide, pretreated by trifunctional siloxane and D4 50 parts of high-temperature-resistant iron red, mix evenly in the kneader, transfer the rubber material to the three-roll machine for grinding, and then transfer to the kneader to heat up and stir, the temperature of the rubber material is 170 ° C, and the vacuum degree = 0.095 Mpa. , vacuum-dried for 4 hours, sealed and cooled to room temperature. Transfer the cooled sizing material to a three-roller mill and grind it evenly to obtain component A product.

[0035] Mix 8.5 parts of ethyl orthosilicate, 1 part of organotin chelate and 3.5 parts of aminopropyltriethoxysilane to obtain component B, which is sealed for use; mix A:B=100:6 to prepare Can.

[0036] Wherein, the pretreatment of trifunctional siloxane and D4 is to pass the steam of trifunctional siloxane and D4 i...

Embodiment 3

[0038] Select 120 parts of hydroxyl-terminated polysiloxane, 40 parts of fumed silica pretreated by trifunctional siloxane and D4, 60 parts of aluminum hydroxide, pretreated by trifunctional siloxane and D4 60 parts of high-temperature-resistant iron red, mix evenly in the kneader, transfer the rubber material to the three-roll machine for grinding, and then transfer it to the kneader to heat up and stir, the temperature of the rubber material is 190 ° C, the vacuum degree = 0.1 Mpa. , vacuum-dried for 5 hours, sealed and cooled to room temperature. Transfer the cooled sizing material to a three-roller mill and grind it evenly to obtain component A product.

[0039] Mix 12 parts of ethyl orthosilicate, 3 parts of organotin chelate and 5 parts of aminopropyltriethoxysilane evenly to obtain component B, which is sealed for use; mix A:B=100:7 to prepare Can.

[0040] Wherein, the pretreatment through trifunctional siloxane and D4 is that the steam of trifunctional siloxane and ...

technical field

[0001] The invention belongs to the field of silicone rubber, in particular to a two-component liquid silicone rubber and a preparation method thereof.

[0002] Background technique

[0003] Silicone rubber is widely used in electronic appliances due to its excellent electrical insulation, arc resistance, corona resistance, water resistance, ozone resistance, weather aging resistance, high and low temperature resistance, and can be used in the temperature range of -60~200 °C. , automotive, aerospace, mechanical construction, textile, chemical, light industry printing, health and other industries as insulation, packaging, caulking, sealing, moisture-proof, shock-proof and roller materials. In addition, because silicone rubber has excellent mold release properties, it is widely used as a soft mold material for the reproduction and manufacture of cultural relics, handicrafts, toys, artificial leather, electronic appliances, instruments, meters and mechanical pa...

Examples

Embodiment 1

[0030] Select 90 parts of hydroxyl-terminated polysiloxane, 20 parts of fumed silica pretreated by trifunctional siloxane and D4, 40 parts of aluminum hydroxide, pretreated by trifunctional siloxane and D4 40 parts of high-temperature-resistant iron red, mix evenly in the kneader, transfer the rubber material to the three-roll machine for grinding, and then transfer to the kneader to heat up and stir, the temperature of the rubber material is 150 ° C, the vacuum degree = 0.085 Mpa. , vacuum-dried for 3 hours, sealed and cooled to room temperature. Transfer the cooled sizing material to a three-roller mill and grind it evenly to obtain component A product.

[0031] Mix 5 parts of tetraethyl orthosilicate, 1 part of organic tin carboxylate and 2 parts of aminopropyltriethoxysilane to obtain component B, which is sealed for use; mix A:B=100:4 to prepare .

[0032] Wherein, the pretreatment of trifunctional siloxane and D4 is to pass the steam of trifunctional siloxane and D4 in...

Embodiment 2

[0034] Select 110 parts of hydroxyl-terminated polysiloxane, 30 parts of fumed silica pretreated by trifunctional siloxane and D4, 50 parts of aluminum hydroxide, pretreated by trifunctional siloxane and D4 50 parts of high-temperature-resistant iron red, mix evenly in the kneader, transfer the rubber material to the three-roll machine for grinding, and then transfer to the kneader to heat up and stir, the temperature of the rubber material is 170 ° C, and the vacuum degree = 0.095 Mpa. , vacuum-dried for 4 hours, sealed and cooled to room temperature. Transfer the cooled sizing material to a three-roller mill and grind it evenly to obtain component A product.

[0035] Mix 8.5 parts of ethyl orthosilicate, 1 part of organotin chelate and 3.5 parts of aminopropyltriethoxysilane to obtain component B, which is sealed for use; mix A:B=100:6 to prepare Can.

[0036] Wherein, the pretreatment of trifunctional siloxane and D4 is to pass the steam of trifunctional siloxane and D4 i...

Embodiment 3

[0038] Select 120 parts of hydroxyl-terminated polysiloxane, 40 parts of fumed silica pretreated by trifunctional siloxane and D4, 60 parts of aluminum hydroxide, pretreated by trifunctional siloxane and D4 60 parts of high-temperature-resistant iron red, mix evenly in the kneader, transfer the rubber material to the three-roll machine for grinding, and then transfer it to the kneader to heat up and stir, the temperature of the rubber material is 190 ° C, the vacuum degree = 0.1 Mpa. , vacuum-dried for 5 hours, sealed and cooled to room temperature. Transfer the cooled sizing material to a three-roller mill and grind it evenly to obtain component A product.

[0039] Mix 12 parts of ethyl orthosilicate, 3 parts of organotin chelate and 5 parts of aminopropyltriethoxysilane evenly to obtain component B, which is sealed for use; mix A:B=100:7 to prepare Can.

[0040] Wherein, the pretreatment through trifunctional siloxane and D4 is that the steam of trifunctional siloxane and ...

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