Transparent bloomless silicone rubber mixed compound and preparation method

Abstract

The invention discloses a transparent bloomless silicone rubber mixed compound and a preparation method. The transparent bloomless silicone rubber mixed compound is prepared from the following components: 100 parts of methyl vinyl silicone rubber mixed compound, 0.5 to 1.0 part of DCBP and 0.3 to 1.0 part of alkyl peroxide. The preparation method comprises the following steps: measuring various components according to a ratio, uniformly dispersing the components into 100 parts of silicone rubber mixed compound, extruding molding by virtue of a rubber extruder, shaping and vulcanizing at a temperature of 500 to 600 DEG C for 5 to 30 s, wherein a temperature of a horizontal drying passage is 200 to 300 DEG C, and the time is 1 to 10 min; and preparing an extruded product corresponding to themold. Compared with the product in the prior art, the product disclosed by the invention has the advantages that on the premise of hardly changing the physical mechanical performance, and in the production, 1 to 2 months with blooming are prolonged to 2 years or more without blooming, so that the extruded product can be stored for a long time, the appearance is not changed, the secondary treatment of the product is reduced, and the product security is improved. In addition, the secondary vulcanizing time can also be reduced, the energy consumption can be saved, and the production cost can bedecreased.

Description

technical field

[0001] The invention relates to the technical field of production methods of silicone rubber products, in particular to the production process of extruding silicone rubber compounds, especially the extrusion production of rubber hoses, solid rubber strips, special-shaped cross-section sealing rubber strips, wires and cables, and the like. Background technique

[0002] At present, DCBP is the most commonly used vulcanizing agent for mixing silicone rubber for extrusion molding. Its advantage is that it has the fastest vulcanization speed among all peroxide curing agents that can be used for silicone rubber. Although DCBP will produce harmful substances such as 2,4-dichlorobiphenyl and corrosive substances to metals such as chlorinated benzoic acid during use, they migrate to the surface of silica gel products and form a white creamy substance, which can be called It is called frosting, which affects the normal use of silicone products, but there is no better v...

Examples

specific Embodiment 1

[0018] Silicone rubber compound 95-100 parts, DCBP 1.0-1.5 parts.

[0019] Preferably, 100 parts of silicone rubber compound; 1.0 part of DCBP.

[0020] making process:

[0021] Disperse and mix 100 parts of silicone rubber and 1.0 part of DCBP on a two-roll mixer.

[0022] Physical and mechanical performance sample preparation, take 500 grams of uniformly mixed rubber, put it into a mold, and vulcanize it on a flat vulcanizing machine to prepare a standard sample for testing physical and mechanical properties. Vulcanization conditions for sample preparation: the vulcanization pressure is 8MP, the vulcanization temperature is 160°C, and the vulcanization time is 8min.

[0023] The appearance of the frosting observation sample is prepared. Take 5000 grams of uniformly mixed rubber material, extrude it through a rubber extruder and a 10mm diameter round rod mold, and set the vulcanization temperature at 500°C for 10s; , the time is 5min, and a transparent round glue stick wit...

specific Embodiment 2

[0034] The silicone rubber compound includes 100 parts of methyl vinyl silicone rubber, 0.5 parts of DCBP, and 0.8 parts of alkoxy peroxide.

[0035] making process:

[0036] Disperse and mix 100 parts of silicone rubber, 0.5 part of DCBP and 0.8 part of alkoxy peroxide on a two-roll mixer.

[0037] Physical and mechanical performance sample preparation, take 500 grams of uniformly mixed rubber, put it into a mold, and vulcanize it on a flat vulcanizing machine to prepare a standard sample for testing physical and mechanical properties. Vulcanization conditions for sample preparation: the vulcanization pressure is 8MP, the vulcanization temperature is 160°C, and the vulcanization time is 8min.

[0038] The appearance of the frosting observation sample is prepared. Take 5000 grams of uniformly mixed rubber material, extrude it through a rubber extruder and a 10mm diameter round rod mold, and set the vulcanization temperature at 500°C for 10s; , the time is 5min, and a transpa...

specific Embodiment 3

[0048] Using the transparent frost-free silicone rubber compound of the present invention, a sealing strip for a sterilizing cabinet is prepared and put into the market for customers to use. The manufacturing process is:

[0049] Mixing: Weigh 10 kg of methyl vinyl silicone rubber compound, knead it on a double-roller mixer until it covers the rolls, add 30 grams of DCBP and 80 grams of alkoxy peroxide BPMC in batches, mix evenly, and release the sheet (about 10mm thick and about 400mm wide).

[0050] Extrusion molding: Cut the film into strips with a width of about 50 mm, extrude and shape the rubber extruder and a mold with inner diameter*diameter=8*20 mm, the curing temperature is 500 ° C, and the time is 10 seconds; the rubber hose after shaping Vulcanize through a horizontal drying tunnel, the temperature of the horizontal drying tunnel is 260°C, and the time is 5 minutes.

[0051] Two-stage vulcanization: Put the extruded rubber hose into a two-stage oven, keep it warm f...

technical field

[0001] The invention relates to the technical field of production methods of silicone rubber products, in particular to the production process of extruding silicone rubber compounds, especially the extrusion production of rubber hoses, solid rubber strips, special-shaped cross-section sealing rubber strips, wires and cables, and the like. Background technique

[0002] At present, DCBP is the most commonly used vulcanizing agent for mixing silicone rubber for extrusion molding. Its advantage is that it has the fastest vulcanization speed among all peroxide curing agents that can be used for silicone rubber. Although DCBP will produce harmful substances such as 2,4-dichlorobiphenyl and corrosive substances to metals such as chlorinated benzoic acid during use, they migrate to the surface of silica gel products and form a white creamy substance, which can be called It is called frosting, which affects the normal use of silicone products, but there is no better v...

Examples

specific Embodiment 1

[0018] Silicone rubber compound 95-100 parts, DCBP 1.0-1.5 parts.

[0019] Preferably, 100 parts of silicone rubber compound; 1.0 part of DCBP.

[0020] making process:

[0021] Disperse and mix 100 parts of silicone rubber and 1.0 part of DCBP on a two-roll mixer.

[0022] Physical and mechanical performance sample preparation, take 500 grams of uniformly mixed rubber, put it into a mold, and vulcanize it on a flat vulcanizing machine to prepare a standard sample for testing physical and mechanical properties. Vulcanization conditions for sample preparation: the vulcanization pressure is 8MP, the vulcanization temperature is 160°C, and the vulcanization time is 8min.

[0023] The appearance of the frosting observation sample is prepared. Take 5000 grams of uniformly mixed rubber material, extrude it through a rubber extruder and a 10mm diameter round rod mold, and set the vulcanization temperature at 500°C for 10s; , the time is 5min, and a transparent round glue stick wit...

specific Embodiment 2

[0034] The silicone rubber compound includes 100 parts of methyl vinyl silicone rubber, 0.5 parts of DCBP, and 0.8 parts of alkoxy peroxide.

[0035] making process:

[0036] Disperse and mix 100 parts of silicone rubber, 0.5 part of DCBP and 0.8 part of alkoxy peroxide on a two-roll mixer.

[0037] Physical and mechanical performance sample preparation, take 500 grams of uniformly mixed rubber, put it into a mold, and vulcanize it on a flat vulcanizing machine to prepare a standard sample for testing physical and mechanical properties. Vulcanization conditions for sample preparation: the vulcanization pressure is 8MP, the vulcanization temperature is 160°C, and the vulcanization time is 8min.

[0038] The appearance of the frosting observation sample is prepared. Take 5000 grams of uniformly mixed rubber material, extrude it through a rubber extruder and a 10mm diameter round rod mold, and set the vulcanization temperature at 500°C for 10s; , the time is 5min, and a transpa...

specific Embodiment 3

[0048] Using the transparent frost-free silicone rubber compound of the present invention, a sealing strip for a sterilizing cabinet is prepared and put into the market for customers to use. The manufacturing process is:

[0049] Mixing: Weigh 10 kg of methyl vinyl silicone rubber compound, knead it on a double-roller mixer until it covers the rolls, add 30 grams of DCBP and 80 grams of alkoxy peroxide BPMC in batches, mix evenly, and release the sheet (about 10mm thick and about 400mm wide).

[0050] Extrusion molding: Cut the film into strips with a width of about 50 mm, extrude and shape the rubber extruder and a mold with inner diameter*diameter=8*20 mm, the curing temperature is 500 ° C, and the time is 10 seconds; the rubber hose after shaping Vulcanize through a horizontal drying tunnel, the temperature of the horizontal drying tunnel is 260°C, and the time is 5 minutes.

[0051] Two-stage vulcanization: Put the extruded rubber hose into a two-stage oven, keep it warm f...

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