Room temperature cured organopolysiloxane composition

Abstract

The cold-curing organic polysiloxane compound comprises: (1) polysiloxane as formula (1), (R1 as one-order alkyl, m is integer); (2) the gel-state CaCO3 treated by mixture with weight as 2.5-4.5% of the CaCO3, 1) 30-70wt% carboxyl acid with melting or softening point more than 100Deg; 2) 10-50wt% saturated fatty acid as CnH2n+1 COOH (n>=10); 3) 5-30wt% unsaturated fatty acid as CnH2n-1 COOH or CnH2n-3COOH (n>=10). This invention has well physical and chemical performances.

Description

technical field The present invention relates to a room temperature curable organopolysiloxane composition which is easily cured by moisture in the air at room temperature and which produces a rubber elastic body particularly excellent in adhesiveness. technical background Conventionally, room-temperature-curable organopolysiloxane compositions that are easily cured by moisture to form rubber elastomers have been widely used in various fields because their cured products have excellent properties such as weather resistance, durability, and cold resistance. Adhesive materials, coating materials, electrical insulation sealing materials, sealing materials for construction, etc. Recently, however, acrylic resin-coated aluminum materials, fluororesin-coated aluminum materials, and room-temperature-curable organopolysiloxane compositions have been increasingly used as building exterior materials. Not only is there a problem of adhesion to the above-mentioned aluminum material su...

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Problems solved by technology

It is described that this composition is excellent in anti-pitting function and adhesiveness, but has the disadvantage of insufficient hot water adhesiveness to surface treatment agents for aluminum materials that are difficult to bond

In order to solve the above-mentioned problems, Japanese Unexamined Publication No. 9-227780 (Patent Document 2) and Japanese Unexamined Publication No. 11-209620 (Patent Document 3) have proposed compositions containing calcium carbonate. treatment agent or containing C n h 2n+1 The treatment agent of saturated fatty acid represented by COOH (n is a number greater than or equal to 20) was treated in an amount of 2.5% by mass or less relative to calcium carbonate, and although the adhesiveness was good, the treatment agent was solid at normal temperature, and Since the amount of treatment is small, it is difficult to handle industrially, and if the treatment is insufficient, there is a problem that the storage stability of the composition is poor

Specifically, during storage, the viscosity of the composition increases, or in severe cases, it gels, and on the contrary, the thixotropy decreases, and it is found that the composition collapses when it is filled in a vertical joint.

Japanese Unexamined Patent Publication No. 10-30058 (Patent Document 4) proposes to use a treatment agent containing abietic acid and a saturated fatty acid, or an abietic acid and an unsaturated fatty acid to treat the particle size in an amount equal to or less than 2.5% by mass relative to calcium carbonate. Calcium carbonate composition of 0.1 μm or less, but storage stability and adhesion to surface-treated aluminum materials cannot be coexisted

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