CN-122012013-A - Dealcoholized organic silicone sealant and preparation method and application thereof

Abstract

The invention relates to the technical field of sealants, and particularly discloses a dealcoholized organic silicone sealant, and a preparation method and application thereof. The dealcoholized organic silicone sealant comprises, by weight, 100-200 parts of alpha, omega-dihydroxy polydimethylsiloxane, 150-400 parts of filler, 5-15 parts of cross-linking agent, 2-8 parts of catalyst and 1-5 parts of coupling agent, wherein the filler comprises surface-modified aluminum hydroxide and calcium carbonate. The dealcoholized organic silicone sealant provided by the invention has the advantages that all raw material components are synergistic together, and the prepared dealcoholized organic silicone sealant has good rapid solidification performance, heat conductivity, electrical insulation performance and adhesion performance, is not easy to generate yellowing, and has good aging stability.

Inventors

• NI WANG
• ZHU ZHIMIN
• YU LIANGBING
• LIU JINMING
• XU WENYUAN

Assignees

• 广州集泰化工股份有限公司
• 安徽集泰新材料有限公司

Dates

Publication Date

20260512

Application Date

20260109

Claims (10)

1. 1. The dealcoholized organic silicone sealant is characterized by comprising, by weight, 80-200 parts of alpha, omega-dihydroxy polydimethylsiloxane, 150-400 parts of a filler, 5-15 parts of a cross-linking agent, 2-8 parts of a catalyst and 1-5 parts of a coupling agent, wherein the filler comprises surface-modified aluminum hydroxide and calcium carbonate.
2. 2. The dealcoholized organosilicone sealant according to claim 1, wherein the α, ω -dihydroxy polydimethylsiloxane has a viscosity of 500cps to 50000cps at 25 ℃.
3. 3. The dealcoholized organosilicone sealant according to claim 1, wherein the calcium carbonate comprises one or a combination of two of heavy calcium carbonate and nano calcium carbonate.
4. 4. The dealcoholized organosilicone sealant according to claim 1, wherein the calcium carbonate is a surface-modified calcium carbonate.
5. 5. The dealcoholized silicone sealant according to claim 1, wherein the filler further comprises one or more of silica fume, zinc borate, alumina, white carbon black, kaolin, talc, titanium pigment, zinc oxide.
6. 6. The dealcoholized silicone sealant according to claim 1, wherein, the cross-linking agent comprises one or more of methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, phenyltrimethoxysilane and phenyltriethoxysilane.
7. 7. The dealcoholized organosilicone sealant according to claim 1, wherein the catalyst comprises a primary titanium complex and/or a secondary titanium complex, wherein the primary titanium complex comprises one or more of diisopropyl bis (ethylacetoacetate) titanate, diisobutyl bis (ethylacetoacetate) titanate, tetraisopropyl titanate and n-butyl titanate, and the secondary titanium complex is bis (ethylacetoacetate-O1, O3) (1, 3-propanediol-O, O') -titanium.
8. 8. The dealcoholized silicone sealant according to claim 1, wherein the coupling agent comprises one or more of gamma-aminopropyl trimethoxysilane, gamma-aminopropyl triethoxysilane, gamma- (2, 3-glycidoxy) propyl trimethoxysilane, N-beta- (aminoethyl) -gamma-aminopropyl trimethoxysilane, 3-aminopropyl trimethoxysilane.
9. 9. The method for preparing the dealcoholized organosilicone sealant according to any one of claims 1 to 8, comprising the following steps: s1, mixing a, omega-dihydroxy polydimethylsiloxane and a filler to obtain a base adhesive; s2, mixing and reacting the base adhesive with a cross-linking agent, a coupling agent and a catalyst to obtain the dealcoholized organic silicone sealant.
10. 10. The application of the dealcoholized organic silicone sealant according to any one of claims 1-8 in the fields of electronics, electrical, new energy automobiles and solar photovoltaic modules.

Description

Dealcoholized organic silicone sealant and preparation method and application thereof Technical Field The invention relates to the technical field of sealants, in particular to a dealcoholized organic silicone sealant, and a preparation method and application thereof. Background The organic silicone sealant is a high polymer material with polydimethylsiloxane as a main component, has excellent weather resistance, high and low temperature resistance, ageing resistance, chemical stability, electrical insulation and excellent biocompatibility, and is cured to form an elastic rubber body through a crosslinking reaction with moisture in air, so that a long-term sealing effect is realized. The organic silicone sealant is mainly divided into a deacidification type, a dealcoholization type, a ketoxime type and a dealcoholization type, wherein the dealcoholization type organic silicone sealant releases alcohol substances in the curing process, has the advantages of low corrosiveness, good environmental protection and the like, and is widely applied to bonding, sealing and encapsulation in the fields of electronics and electrics, new energy automobiles, solar photovoltaic modules and the like. With the rapid development of industrial technology, the requirements on the dealcoholized organic silicone sealant are higher and higher, and the sealant is required to have good sealing and bonding properties, rapid solidification, high insulativity and high heat conduction capacity. In order to improve the production efficiency, for example, on an automatic production line, it is highly desirable that the sealant can be cured rapidly and deeply, that is, from the surface dry to the inside completely in a short time, so as to shorten the waiting time of the process. Such as sealants for electronic and electrical components, must have extremely high electrical insulation properties, and in particular, must maintain high insulation resistance in a humid environment to prevent leakage or short circuit problems. Along with the continuous improvement of the power density of the electronic equipment, the heat generated during the operation of the components is increased, and the sealant is required to have a certain heat conduction capability while having excellent insulativity, so that the heat dissipation is assisted, and the long-term stable operation of the components is ensured. The traditional organic silicone sealant is generally prepared by taking alpha, omega-dihydroxyl polydimethylsiloxane (107 glue) as a base polymer, and matching a cross-linking agent, a powder filler and a catalyst. Researchers often modify or adjust the components of the sealant in order to enhance certain properties of the silicone sealant. However, there are great technical challenges in pursuing the balance of various high performances of silicone sealants, such as that the improvement of the quick curing performance of silicone sealants tends to sacrifice the storage stability of products, that the improvement of the high thermal conductivity of sealants by introducing metal oxides tends to reduce the electrical insulation performance of materials to some extent, and the like. Therefore, the dealcoholized organic silicone sealant which can simultaneously meet the requirements of rapid deep solidification, high wet insulation resistance and good heat conduction performance and can be stored stably is developed, and has important industrial application value. Disclosure of Invention The present invention aims to solve at least one of the above technical problems in the prior art. To this end, a first object of the present invention is to provide a dealcoholized silicone sealant. The second object of the invention is to provide a preparation method of the dealcoholized organic silicone sealant. A third object of the present invention is to provide the use of such dealcoholized silicone sealants. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The invention provides dealcoholized organic silicone sealant which comprises, by weight, 100-200 parts of alpha, omega-dihydroxy polydimethylsiloxane, 150-400 parts of filler, 5-15 parts of a cross-linking agent, 2-8 parts of a catalyst and 1-5 parts of a coupling agent, wherein the filler comprises surface-modified aluminum hydroxide and calcium carbonate. In the dealcoholized organic silicone sealant raw material provided by the invention, aluminum hydroxide is an excellent flame retardant and heat conducting filler, and has high volume resistivity. The aluminum hydroxide after surface modification greatly enhances the compatibility and the dispersibility of the aluminum hydroxide and an organosilicon matrix, and the excellent intrinsic insulativity of the matrix is maintained to the maximum extent while an effective heat conduction network is constructed, and the good dispersibility of the filler also reduces the adsorption deactivation of the catalyst and