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Silicone sealant with anti-bulging performance and preparation method thereof

A silicone sealant, performance technology, applied in the direction of adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problem of little glue seam bulging, insufficient curing depth and curing strength of silicone sealants, Low efficiency and other problems, to achieve the effect of solving the problem of easy shrinkage and bulging of the glue seam and excellent anti-bulging performance

Inactive Publication Date: 2021-08-17
广州绿腾新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the existing silicone sealants are used for caulking and sealing of aluminum veneer curtain walls, they are easily affected by the thermal expansion and contraction of aluminum veneer curtain walls, resulting in swelling of the glue joints, which seriously affects the progress of the project and the appearance of the curtain wall.
Moreover, when the existing silicone sealant is used under the condition of large temperature difference, it is also prone to the problem of shrinkage and swelling of the glue seam
[0004] The research found that the reason for the bulging of the glue seam is that the curing depth and curing strength of the silicone sealant in the early stage of curing are not enough
At present, the solution provided by most manufacturers is to carry out two gluing operations, one part each time, and then apply another glue after the current gluing is cured to prevent the glue seam from bulging. This method can solve the problem of slow curing of the deep layer of the colloid. Because the thickness of the two times of glue is small, the deep layer solidifies quickly, and is less affected by the external environment temperature, but this method can rarely completely solve the problem of glue seam swelling in actual operation, and the construction efficiency is low, which will directly affect the construction period. increased construction costs

Method used

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  • Silicone sealant with anti-bulging performance and preparation method thereof
  • Silicone sealant with anti-bulging performance and preparation method thereof
  • Silicone sealant with anti-bulging performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of silicone sealant with anti-bulging performance, its preparation method comprises the following steps:

[0034] 1) Add 100 parts by mass of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 500000cps and 40 parts by mass of nano-calcium carbonate into the kneader, and dehydrate for 180min at a temperature of 100°C and a vacuum of -0.08MPa. get base material;

[0035] 2) Mix the silane coupling agent KH-550 and the silane coupling agent KH-560 according to the molar ratio of 1:2, and stir at 105°C for 4 hours to obtain the aminosilane-epoxysilane copolymer;

[0036] 3) Add the base material of step 1) into a planetary mixer, then add 2 parts by mass of tetrabutanoximinosilane, 18 parts by mass of methyltributanoximinosilane, 10 parts by mass of aminosilane-cyclosilane in step 2). Oxysilane copolymer, 2 parts by mass of silane coupling agent KH-550 and 0.5 parts by mass of dibutyltin dilaurate, stirred and dispersed for 40 minutes under a vacuum of -0.1MPa ...

Embodiment 2

[0038] A kind of silicone sealant with anti-bulging performance, its preparation method comprises the following steps:

[0039] 1) Add 100 parts by mass of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 50000cps and 100 parts by mass of nano-calcium carbonate into the kneader, and dehydrate for 180min at a temperature of 110°C and a vacuum of -0.08MPa. get base material;

[0040] 2) Mix the silane coupling agent KH-540 and the silane coupling agent KH-560 according to the molar ratio of 1:2, and stir at 105°C for 4 hours to obtain the aminosilane-epoxysilane copolymer;

[0041] 3) Add the base material of step 1) into the planetary mixer, then add 10 parts by mass of tetrabutanoximinosilane, 25 parts by mass of methyltributanoximinosilane, and 5 parts by mass of aminosilane-cyclosilane in step 2). Oxysilane copolymer, 5 parts by mass of silane coupling agent KH-550 and 0.1 part by mass of dibutyltin diacetate, stirred and dispersed for 40 minutes under a vacuum of -0....

Embodiment 3

[0043] A kind of silicone sealant with anti-bulging performance, its preparation method comprises the following steps:

[0044] 1) Add 100 parts by mass of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 50,000cps, 10 parts by mass of fumed silica and 10 parts by mass of heavy calcium into the kneader, at a temperature of 90°C and a vacuum of - Dehydration under the condition of 0.08MPa for 180min to obtain the base material;

[0045] 2) Mix the silane coupling agent KH-550 and the silane coupling agent KH-560 according to the molar ratio of 1:2, and stir at 105°C for 4 hours to obtain the aminosilane-epoxysilane copolymer A;

[0046] 3) Mix the silane coupling agent KH-792 and the silane coupling agent KH-560 according to the molar ratio of 1:2, and stir at 105°C for 4 hours to obtain the aminosilane-epoxysilane copolymer B;

[0047]4) Add the base material of step 1) into a planetary mixer, then add 5 parts by mass of tetrabutanoximinosilane, 25 parts by mass of meth...

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Abstract

The invention discloses a silicone sealant with anti-bulging performance and a preparation method thereof. The silicone sealant comprises alpha, omega-dihydroxy polydimethylsiloxane, a reinforcing filler, a ketoxime type cross-linking agent, an amino silane-epoxy silane copolymer, a coupling agent and a catalyst, and the preparation method comprises the following steps: firstly, dehydrating the alpha, omega-dihydroxy polydimethylsiloxane and the reinforcing filler; and then mixing with the ketoxime type cross-linking agent, the amino silane-epoxy silane copolymer, the coupling agent and the catalyst, and stirring. The silicone sealant provided by the invention meets the requirements of 50-grade sealants in GB / T 14683-2017 Silicone Building Sealants, also has excellent anti-bulging performance, and can well solve the problem that the existing silicone sealant is easy to bulge when being used for aluminum veneer curtain wall joints and the problem that glue joints are easy to shrink and bulge when being used under the condition of large temperature difference.

Description

technical field [0001] The invention relates to the technical field of silicone sealants, in particular to a silicone sealant with anti-bulging performance and a preparation method thereof. Background technique [0002] Silicone sealant is a paste made of polydimethylsiloxane as the main raw material, supplemented with crosslinking agent, filler, plasticizer, coupling agent, catalyst, etc. in a vacuum state. It can react with water in the air to form elastic silicone rubber at room temperature. [0003] Silicone sealant has excellent UV aging resistance, weather aging resistance and bonding performance, and is widely used in the construction industry (for example: glass curtain wall structural bonding, secondary sealing of insulating glass, building exterior walls and internal joints Sealing, sealing and bonding of door and window joints, etc.). However, when the existing silicone sealants are used for caulking and sealing of aluminum veneer curtain walls, they are easily ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/04C09J183/08C09J11/04C09J11/06C09J11/08
CPCC09J183/04C09J11/04C09J11/06C09J11/08C08L2205/02C08L2205/03C08L2205/025C08K2201/014
Inventor 杨梅
Owner 广州绿腾新材料有限公司
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