Silicone sealant and preparation method thereof

A technology of silicone sealant and hydroxyl sealant, which is applied in the direction of chemical instruments and methods, adhesives, and other chemical processes, can solve the problems of unsatisfactory concrete bonding performance and low modulus of silicone sealant, so as to avoid oil seepage Phenomenon, good weather aging resistance, excellent adhesive effect

Active Publication Date: 2016-02-10
LUZHOU NORTH CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the modulus of the existing silicone sealant is too low, and the bonding performance to concrete is not ideal

Method used

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  • Silicone sealant and preparation method thereof
  • Silicone sealant and preparation method thereof

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preparation example Construction

[0027] The present invention also provides the preparation method of above-mentioned silicone sealant, comprises the following steps:

[0028] a. Dehydrate 100 parts of hydroxyl-terminated polydimethylsiloxane, 1 to 5 parts of fumed white carbon black and 1 to 150 parts of nanometer calcium carbonate for 1 to 4 hours, and cool to room temperature to obtain the base material;

[0029] b. Then add 1-12 parts of coupling agent, 0.1-4 parts of tackifier, 8-60 parts of plasticizer, 0.1-1.8 parts of anti-fungal agent and 0.1-5 parts of catalyst, and the vacuum degree is 0.075-0.095MPa Stirring at low temperature for 0.5-2 hours to obtain silicone sealant.

[0030] Wherein, in the step a of the preparation method of the above-mentioned silicone sealant, the temperature of the dehydration is 90-140° C., and the degree of vacuum is 0.075-0.095 MPa.

[0031] The sources and specifications of the raw materials used in the embodiments of the present invention are shown in Table 1:

[00...

Embodiment 1

[0036] Add 300 parts of hydroxyl-terminated polydimethylsiloxane with a viscosity of 50 Pa.s at 25°C, 210 parts of nano-active calcium carbonate, and 12 parts of fumed white carbon black into a power mixer, at 135°C, vacuum The density is 0.075-0.095MPa, dehydration and blending for 1 hour, and cooling to room temperature to obtain the base material. At room temperature, mix 25 parts of methyl tributyl ketoxime silane, 65 parts of long-chain liquid silicone resin, 7.5 parts of γ-aminopropyl triethoxysilane, 4 parts of silicone sealant antifungal agent, dilauric acid di 3 parts of butyl tin, stirred for 1 hour under the vacuum condition of 0.075-0.095MPa, and filled with air isolation, to obtain the silicone sealant product.

Embodiment 2

[0038] Add 300 parts of hydroxyl-terminated polydimethylsiloxane with a viscosity of 80 Pa.s at 25°C, 150 parts of nano-active calcium carbonate, and 15 parts of fumed white carbon black into a power mixer, at 120°C, vacuum The density is 0.075-0.095 MPa, dehydrated and blended for 1.5 hours, cooled to room temperature to obtain the base material. At room temperature, mix 21 parts of vinyl tributyl ketoxime silane, 70 parts of long-chain liquid silicone resin, 7.5 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and silicone sealant to prevent mildew 5 parts of tin octoate, 5 parts of stannous octoate, stirred for 1 hour under vacuum conditions, and filled with air isolation, to obtain the silicone sealant product.

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Abstract

The invention belongs to the field of polymeric sealants and specifically relates to a silicone sealant and a preparation method thereof. The silicone sealant is used for solving the technical problems of tool low modulus and unideal adhesive property to concrete of an existing silicone sealant. The silicone sealant is prepared from such components in parts by weight as 100 parts of hydroxyl-terminated polydimethylsiloxane, 1-150 parts of nano calcium carbonate, 1-5 parts of fumed silica, 1-12 parts of coupling agent, 8-60 parts of plasticizer, 0.1-4 parts of tackifier, 0.1-1.8 parts of mold-proof agent and 0.1-5 parts of catalyst. The invention also provides the preparation method of the silicone sealant. The silicone sealant has excellent adhesion to building materials such as concrete, is good in weather ageing resistance and good waterproof effect, and can be applied to relatively severe environments.

Description

technical field [0001] The invention belongs to the field of polymer sealing materials, and in particular relates to a silicone sealant and a preparation method thereof. Background technique [0002] Concrete buildings are generally constructed with joints due to expansion and contraction caused by temperature differences. Joints are the weak link of concrete buildings. First, foreign matter accumulates in the joints, hindering the normal expansion of the joints; second, the joints seep water, erode and soften the roadbed, so the expansion joints must be sealed. The concrete joint sealing materials currently used in my country mainly include asphalt, modified asphalt, prefabricated neoprene, polysulfide and polyurethane materials. These materials have poor durability, elasticity, water resistance, and overall adhesion, which greatly affects the service life of concrete buildings. Silicone sealing materials have excellent high and low temperature resistance, aging resistance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/06C09J11/04C09K3/10
Inventor 孙晓泉李争鸣贺虎王勇武朱文英张文博
Owner LUZHOU NORTH CHEM IND
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