KR20090092850A - Moisture-curing type silicone adhesive with flame retardant property - Google Patents

Abstract

A moisture-curing type silicone adhesive is provided to ensure short set-to-touch compared with conventional moisture-curing type silicone adhesive and excellent fire retardant characteristic, and to be environment-friendly. A moisture-curing type silicone adhesive comprises trimethoxysilylpolydimethylsiloxane 20~40 weight%, organic silane compound 0.1~10 weight%, filler 19.90~78.79 weight%, silicone oil 1~20 weight%, catalyst 0.1~10 weight% and platinum flame retardant 0.01~0.1 weight%. The trimethoxysilyl polydimethylsiloxane is the compound of chemical formula (1). The filler is at least one compound selected from aluminum trihydrate, ammonium polyphate, and melamine cyanurate.

Description

Moisture-curing type silicone adhesive with flame retardant property

The present invention relates to a moisture-curable flame-retardant silicone adhesive, and more particularly to a one-component silicone adhesive that reacts with moisture in the air to harden moisture and has excellent flame retardancy.

In recent years, with the development of various industries, in the adhesive industry, environmentally friendly adhesives having excellent durability and adhesive strength are required, and flame retardancy is also required in the application of electric and electronic component fields. In order to improve workability, fast curing products are preferred.

Organic polymers having reactive silyl groups, i.e. modified silicon resins, have room temperature curability and their cured products exhibit rubber elasticity and are therefore used as sealing agents due to their properties in coating and adhesive applications. In general, silicone adhesives are mainly composed of oxime-curable adhesives. However, in the electronic and electronic fields, adhesives using polydimethylsiloxane end-capped with methyldimethoxysilyl group as a main resin are mainly used due to corrosiveness and disgusting smell. Oxime-curable silicone compositions have been disclosed in US Pat. Nos. 3,471,434 and 3,962,160, and silicone compositions endcapped with alkoxysilanes are reported in Japanese Patent Nos. 58-52351, US Pat. Nos. 5,053442, and 5,840,794, and the like. have.

However, polydimethylsiloxanes end capped with methyldimethoxysilyl group have a problem that the curing time is longer than that of oxime-curable products, and the viscosity increases during storage.

The present invention provides a moisture-curable flame-retardant silicone adhesive having a shorter drying time than the conventional moisture-curable flame-retardant silicone adhesive, environmentally friendly, and excellent flame retardancy.

In addition, the present invention provides a moisture-curable flame-retardant silicone adhesive that the main chain is polydimethylsiloxane, including a resin end capped of trimethoxysilyl groups at both ends thereof, so as to be in contact with moisture in the air to shorten the curing time. .

Moisture-curable flame-retardant silicone adhesive of the present invention for achieving this problem is 20 to 40% by weight of trimethoxysilyl polydimethylsiloxane, 0.1 to 10% by weight of an organosilane compound, 19.90 to 78.79% by weight, silicone oil 1 to 20 It is characterized in that the composition is composed of weight%, 0.1 to 10% by weight of catalyst and 0.01 to 0.1% by weight of platinum flame retardant.

The trimethoxysilyl polydimethylsiloxane is the same as the following Structural Formula (1), the viscosity is preferably in the range of 3,000 to 50,000 centipoise (cps) at 25 ℃.

The filler serves to enhance flame retardancy and is any one compound selected from aluminum trihydrate, silica, ammonium polyphosphate, and melamine cyanorate.

The organosilane compound serves to smoothly react organic and inorganic substances or to prevent gelation due to moisture penetration during storage. The organosilane compounds include vinyltrimethoxysilane, vinyltriethoxysilane, γ- (methacryloxypropyl) trimethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-glycidoxypropylmethyldiethoxysilane , N-β (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β (aminoethyl) -γ-aminopropylmethyldimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ- At least one compound selected from aminopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, methyltrimethoxysilane and tris- [3- (trimethoxysilyl) propyl] isocyanate.

More preferably, the silicone oil is a non-reactive silicone oil having a viscosity of 10 to 1,000 centipoise (cps), and the catalyst is titanium chelate.

In the present invention, the main chain is polydimethylsiloxane, and the curing time is shortened by more contact with the components in the air, including a resin in which both ends of the triketoxysilyl group are end capped.

When each of the components constituting the moisture-curable flame retardant silicone adhesive according to the present invention is out of the above range, there is a problem in that the time-to-touch drying time is long or flame retardancy is lowered.

Specifically, the flame retardancy is lowered when the content of the filler is less than 19.9% by weight, and when the content of the filler exceeds 78.79% by weight, the adhesive strength is lowered.

In addition, when the organosilane compound is out of the above range, the organic material and the inorganic material in the adhesive may not react smoothly or may not effectively prevent gelation due to moisture penetration during storage of the adhesive.

The present invention includes a compound whose main chain is polydimethylsiloxane and a trimethoxysilane group is end capped at both ends, and has a shorter drying time than the conventional moisture-curable flame-retardant silicone adhesive, and is environmentally friendly and excellent in flame retardancy.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

However, the present invention is not limited to the protection scope due to the following examples.

Example  One

30 g of trimethoxysilylpolydimethylsiloxane, 52.95 g of aluminum trihydrate, 10 g of silicone oil, and 3 g of methyltrimethoxysilane were added to a stirrer filled with nitrogen, stirred for 2 hours, and then tris- [3- (trimeth 1 g of oxysilyl) propyl] isocyanate, 0.05 g of platinum flame retardant, and 3 g of titanium chelate were added thereto, followed by stirring for 15 minutes to prepare a one-component moisture-curable flame-retardant silicone adhesive.

The results of evaluating various physical properties of the prepared moisture-curable silicone adhesive are shown in Table 1.

Example  2

30 g of trimethoxysilylpolydimethylsiloxane, 53.95 g of aluminum trihydrate, 10 g of silicone oil, and 3 g of methyltrimethoxysilane were added to a stirrer filled with nitrogen, stirred for 2 hours, and then tris- [3- (trimeth 1 g of oxysilyl) propyl] isocyanate, 0.05 g of platinum flame retardant, and 2 g of titanium chelate were added thereto, followed by stirring for 15 minutes to prepare a one-component moisture-curable flame-retardant silicone adhesive.

The results of evaluating various physical properties of the prepared moisture-curable silicone adhesive are shown in Table 1.

Example  3

30 g of trimethoxysilylpolydimethylsiloxane, 54.95 g of aluminum trihydrate, 10 g of silicone oil, and 3 g of methyltrimethoxysilane were added to a stirrer filled with nitrogen, stirred for 2 hours, and then tris- [3- (trimeth 1 g of oxysilyl) propyl] isocyanate, 0.05 g of platinum flame retardant, and 1 g of titanium chelate were added thereto, followed by stirring for 15 minutes to prepare a one-component moisture-curable flame-retardant silicone adhesive.

The results of evaluating various physical properties of the prepared moisture-curable silicone adhesive are shown in Table 1.

Comparative Example  One

30 g of trimethoxysilylpolydimethylsiloxane, 53 g of aluminum trihydrate, 10 g of silicone oil, and 3 g of methyltrimethoxysilane were added to a stirrer filled with nitrogen, stirred for 2 hours, and then tris- [3- (trimethoxy 1 g of silyl) propyl] isocyanate and 3 g of titanium chelate were added, followed by stirring for 15 minutes to prepare a one-component moisture-curable flame-retardant silicone adhesive.

The results of evaluating various physical properties of the prepared moisture-curable silicone adhesive are shown in Table 1.

Comparative Example  2

30 g of methyldimethoxysilylpolydimethylsiloxane, 53.95 g of aluminum trihydrate, 10 g of silicone oil, and 3 g of methyl trimethoxysilane were added to a stirrer filled with nitrogen, stirred for 2 hours, and then tris- [3- (trimeth 1 g of oxysilyl) propyl] isocyanate, 0.05 g of platinum flame retardant, and 2 g of titanium chelate were added thereto, followed by stirring for 15 minutes to prepare a one-component moisture-curable flame-retardant silicone adhesive.

The results of evaluating various physical properties of the prepared moisture-curable silicone adhesive are shown in Table 1.

Property evaluation result division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Drying time 4 minutes 9 minutes 20 minutes 50 minutes 25 minutes Flame retardant Great Great Great Bad Great Adhesion Good Good Good Good Good Storage stability Good Good Good Good Good

Claims (7)

20 to 40% by weight of trimethoxysilylpolydimethylsiloxane, 0.1 to 10% by weight of organosilane compound, 19.90 to 78.79% by weight of filler, 1 to 20% by weight of silicone oil, 0.1 to 10% by weight of catalyst and 0.01 to 0.1% of platinum flame retardant Moisture-curable flame-retardant silicone adhesive, characterized in that the composition. 2. The organosilane compound according to claim 1, wherein the organosilane compound is vinyltrimethoxysilane, vinyltriethoxysilane, γ- (methacryloxypropyl) trimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycol. Seedoxypropylmethyldiethoxysilane, N-β (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β (aminoethyl) -γ-aminopropylmethyldimethoxysilane, γ-aminopropyltriethoxysilane , N-phenyl-γ-aminopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, methyltrimethoxysilane and tris- [3- (trimethoxysilyl) propyl] isocyanate Moisture-curable flame-retardant silicone adhesive, characterized in that. The moisture-curable flame retardant silicone adhesive according to claim 1, wherein the trimethoxysilylpolydimethylsiloxane is a compound represented by the following structural formula (1). The moisture-curable flame retardant silicone adhesive according to claim 1, wherein the filler is at least one compound selected from aluminum trihydrate, silica, ammonium polyphosphate and melamine cyanorate. The moisture-curable flame retardant silicone adhesive of claim 1 wherein the catalyst is titanium chelate. The moisture-curable flame retardant silicone adhesive of claim 1, wherein the silicone oil is a non-reactive silicone oil having a viscosity of 10 to 1,000 centipoise (cps). The moisture-curable flame retardant silicone adhesive of claim 1, wherein the trimethoxysilylpolydimethylsiloxane has a viscosity of 3,000 to 50,000 centipoise (cps).