CN-121974945-A - Post-crosslinking type silane coupling agent suitable for silicone adhesive, water-resistant ultraviolet-resistant silicone adhesive and application thereof

Abstract

The invention provides a post-crosslinking type silane coupling agent, water-resistant ultraviolet-resistant silicone adhesive and application thereof, belonging to the technical field of sealant. The water-resistant ultraviolet-resistant silicone adhesive comprises polysiloxane resin, polydimethylsiloxane, polyether modified silicone oil, ethylenediamine tetraacetic acid chelating agent, color paste, reactive silicone oil, a first silane coupling agent, an organotin catalyst and a post-crosslinking silane coupling agent.

Inventors

• DUAN CUNYE
• WANG HAOQI
• DU SHANZHAO

Assignees

• 北京东方雨虹防水技术股份有限公司

Dates

Publication Date

20260505

Application Date

20251226

Claims (10)

1. 1. The post-crosslinking type silane coupling agent suitable for the silicone adhesive is characterized by being bis (diisopropylketoxime) dimethoxy silane, and has the following structure: ; Wherein iPr is isopropyl.
2. 2. The method for producing a post-crosslinking silane coupling agent according to claim 1, comprising: And (3) reacting triethylamine with diisopropylketoxime and dimethyldichlorosilane to obtain bis (diisopropylketoxime) dimethoxy silane.
3. 3. A water-resistant uv-resistant silicone adhesive, comprising: Polysiloxane resin, polydimethylsiloxane, polyether modified silicone oil, ethylenediamine tetraacetic acid chelating agent, color paste, reactive silicone oil, first silane coupling agent, organotin catalyst, and post-crosslinking type silane coupling agent according to claim 1.
4. 4. The water-resistant uv-resistant silicone adhesive of claim 3, further comprising: A polyfunctional crosslinking agent, a functional auxiliary agent, an inorganic filler, an ultraviolet absorber and a light stabilizer; The waterproof ultraviolet-resistant silicone adhesive is single-component or double-component, and the components in the single-component and the double-component can be different.
5. 5. The water-resistant ultraviolet-resistant silicone adhesive according to claim 4, wherein the water-resistant ultraviolet-resistant silicone adhesive is a two-component water-resistant ultraviolet-resistant silicone adhesive comprising an A component and a B component, the mass ratio of the A component to the B component is 10-15:1, Wherein, the A component comprises: 25-50 parts of polysiloxane resin, 5-15 parts of polydimethylsiloxane, 5-10 parts of polyether modified silicone oil, 0.5-3 parts of ethylenediamine tetraacetic acid chelating agent, 0-1 part of functional auxiliary agent, 50-110 parts of inorganic filler, 0.1-2 parts of ultraviolet absorber and 0.1-2 parts of light stabilizer; wherein, the B component comprises: 45-60 parts of color paste, 25-35 parts of reactive silicone oil, 1-5 parts of polyfunctional crosslinking agent, 8-15 parts of first silane coupling agent, 0.1-0.5 part of organotin catalyst and 1-5 parts of post-crosslinking silane coupling agent according to claim 1.
6. 6. The water-resistant ultraviolet-resistant silicone adhesive according to claim 4, wherein the functional auxiliary agent comprises 0-0.5 part of dispersing agent and 0-0.5 part of leveling agent; the inorganic filler comprises 5-20 parts of heavy calcium, 22-40 parts of hydrophobic nano calcium, 22-40 parts of nano calcium, 1-5 parts of titanium dioxide and 0-5 parts of hydrophobic hollow glass microspheres; the first silane coupling agent comprises KH310, KH560, KH792 and dimethyl dimethoxy siloxane.
7. 7. The water-resistant uv-resistant silicone adhesive of claim 3, wherein the water-resistant uv-resistant silicone adhesive is a one-component water-resistant uv-resistant silicone adhesive comprising: 80-120 parts of polysiloxane resin, 5-25 parts of polydimethylsiloxane, 0-10 parts of polyether modified silicone oil, 0.5-3 parts of ethylenediamine tetraacetic acid chelating agent, 0.1-3 parts of functional auxiliary agent, 98-147 parts of inorganic filler, 0.1-3 parts of ultraviolet absorbent, 0.1-3 parts of light stabilizer, 5-15 parts of color paste, 5-15 parts of reactive silicone oil, 0.1-7 parts of first silane coupling agent, 0.05-0.5 part of organotin catalyst and 1-5 parts of post-crosslinking silane coupling agent according to claim 1.
8. 8. The water-resistant ultraviolet-resistant silicone adhesive according to claim 7, wherein the inorganic filler comprises 25-50 parts of heavy calcium, 70-90 parts of hydrophobic nano calcium and 3-7 parts of titanium dioxide; The silane coupling agent comprises KH310, KH560 and KH792.
9. 9. The water-resistant uv-resistant silicone adhesive according to any one of claims 3 to 8, wherein the polyether-modified silicone oil is obtained by reacting α -isopropenyl- ω -butyl polyoxypropylene ether with a hydrogen-containing silicone oil in the presence of a cassiterite catalyst and an alkynol inhibitor; The molecular weight of the polysiloxane resin is 30000-80000.
10. 10. Use of the water-resistant uv-resistant silicone adhesive according to any one of claims 3 to 9 in construction sealants.

Description

Post-crosslinking type silane coupling agent suitable for silicone adhesive, water-resistant ultraviolet-resistant silicone adhesive and application thereof Technical Field The invention belongs to the technical field of sealants, and particularly relates to a post-crosslinking type silane coupling agent suitable for silicone adhesives, a waterproof ultraviolet-resistant silicone adhesive and application thereof. Background The conventional silicone structural adhesive has the risk of debonding or partial debonding under the water-ultraviolet condition, and is characterized in that after the water-ultraviolet irradiation, the surface of the silicone adhesive has cracks, and the bonding surface is subjected to bonding damage or partial bonding damage, so that the material can not meet the use requirement. The root cause of the method is that under the conditions of high temperature water (45+/-1) DEG C) and strong ultraviolet rays (irradiance at 300-400 nm of broadband is (60+/-2) W/m 2; when a narrow-band measurement method is adopted, irradiance at 340nm of the narrowband is (0.51+/-0.02) W/(m 2. Nm)), the surface of the material is aged for 1008 hours, the surface of the material is cracked by ultraviolet rays, the waterproof/hydrophobic capacity is lost, water is easier to penetrate into the inside of the sealant, the silicone structural adhesive is hydrolyzed at high temperature, the basic mechanical property and the adhesive property of the material are reduced, and the adhesive damage is caused. Disclosure of Invention Aiming at the technical problems, the invention provides a post-crosslinking type silane coupling agent suitable for silicone adhesive, water-resistant ultraviolet-resistant silicone adhesive and application thereof, so as to at least partially solve the technical problems. As a first aspect of the present invention, there is provided a post-crosslinking type silane coupling agent suitable for silicone adhesive, which is bis (diisopropylketoxime) dimethoxy silane having the following structure: Wherein iPr is isopropyl. As a second aspect of the present invention, there is provided a method for preparing a post-crosslinking type silane coupling agent, comprising reacting triethylamine with diisopropylketoxime, dimethyldichlorosilane to obtain bis (diisopropylketoxime) dimethoxysilane. As a third aspect of the invention, there is provided a water-resistant UV-resistant silicone adhesive comprising a polysiloxane resin, polydimethylsiloxane, polyether modified silicone oil, ethylenediamine tetraacetic acid chelating agent, color paste, reactive silicone oil, a first silane coupling agent, an organotin catalyst, and the aforementioned post-crosslinking silane coupling agent. As a fourth aspect of the present invention, there is provided the use of a water-resistant uv-resistant silicone adhesive in a construction sealant. Based on the technical scheme, the post-crosslinking type silane coupling agent suitable for the silicone adhesive, the water-resistant ultraviolet-resistant silicone adhesive and the application have at least one of the following beneficial effects: (1) In the technical scheme of the invention, two huge diisopropyl ketoxime groups in the post-crosslinking silane coupling agent provide sufficient steric hindrance for the middle silicon atom, and can effectively prevent the catalyst in the silicone adhesive from approaching, so that the catalyst can keep inertia in the silicone adhesive. The post-crosslinking type silane coupling agent forms a disilanol molecule after hydrolysis, and the disilanol molecule can be used as a chain extender or a crosslinking agent, can be recombined with two polymer chains (Si-OH) formed by hydrolytic cleavage of water molecules, effectively reconnects broken chains which are damaged, restores a network structure and restores the mechanical properties of the silicone adhesive. In addition, the method for preparing the post-crosslinking silane coupling agent is simpler and has high repeatability. (2) In the technical scheme of the invention, the synthesized post-crosslinking silane coupling agent is applied to the silicone adhesive formula, and the adhesive effect of the silicone adhesive after soaking or encountering water is ensured through the steric effect, the reserved proper activity and the capability of triggering the re-crosslinking when encountering water. Furthermore, polyether modified silicone oil is introduced into the silicone adhesive formula, can migrate to the silicone adhesive interface and form a durable hydrophobic protective layer, and can improve the adhesive property of the silicone adhesive after being immersed in water by combining the scheme of crosslinking after meeting water. Detailed Description Embodiments of the present invention will be described below, but it should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. In the following detai