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Method for surface modifying silicone sulphurized at atmosphere by calcium carbonate
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A vulcanized silicone and surface modification technology, which is applied in the treatment of dyed low-molecular organic compounds, fibrous fillers, etc., can solve the problems of poor thixotropy of silicone rubber, failure of building structural adhesives, yellowing of silicone rubber, etc., to achieve The effect of easy production process, high production efficiency and stable product quality
Inactive Publication Date: 2005-06-29
GUANGZHOU GBS HIGH TECH & IND
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[0004] Japanese patent (JP 04006105) uses a mixture of sodium stearate and sodium oleate to modify the surface of calcium carbonate. Since sodium oleate molecules contain unsaturated double bonds, they are easily oxidized by air. This calcium carbonate acts as a silicone The filler of the rubber, the silicone rubber will appear yellowing after being exposed to wind and rain, and the weather resistance will be reduced
[0005] Chinese patent (publication number CN 1104180A) uses mixed esters of higher fatty acids to modify the surface of calcium carbonate. The silicone rubber made of this calcium carbonate as filler has poor thixotropy and low strength, so it can only be used as a silicone rubber. A kind of sealant filler, not as a filler for building structural adhesives
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Embodiment 1
[0014] Be that 15% in concentration, temperature is in the calcium carbonate slurry of 70 ℃, add the first modifier of calcium carbonate weight 2%, this modifier is made of 75% stearic acid, 20% white oil, 5 % of caustic soda is emulsified with 3 times the amount of hot water at 80°C, mechanically stirred for 20 minutes; then add the second modifier of 1.5% by weight of calcium carbonate, which is made of % paraffin, 10% ammonia (28%) emulsified with 3 times the amount of 70 ° C hot water, mechanically stirred for about 10 minutes, then filtered, dried, and pulverized to obtain modified nano-calcium carbonate.
Embodiment 2
[0016] Be 18% at concentration, be that in the calcium carbonate slurry of 75 ℃ in temperature, add the first modifier of calcium carbonate weight 2.5%, this modifier is made of 80% stearic acid, 15% white oil, 5 % of caustic soda is emulsified with 3 times the amount of 80 ℃ hot water, and mechanically stirred for 20 minutes; then add the second modifier of 1% calcium carbonate weight, which is made of 90 % paraffin, 10% ammonia (28%) emulsified with 3 times the amount of 70 ° C hot water, mechanically stirred for about 10 minutes, then filtered, dried, and pulverized to obtain modified nano-calcium carbonate.
Embodiment 3
[0018] Be that 15% in concentration, temperature is in the calcium carbonate slurry of 50 ℃, add the first kind of modifying agent of calcium carbonate weight 2%, this modifying agent is made of 75% stearic acid, 20% white oil, 5 % of caustic soda is emulsified with 3 times the amount of hot water at 80°C, mechanically stirred for 20 minutes; then add the second modifier of 1.5% by weight of calcium carbonate, which is made of % paraffin, 10% ammonia (28%) emulsified with 3 times the amount of 70 ° C hot water, mechanically stirred for about 10 minutes, then filtered, dried, and pulverized to obtain modified nano-calcium carbonate.
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Abstract
The invention discloses a surface modification method of calcium carbonate for room temperature vulcanized silicone rubber. The method is to use two kinds of modifiers in the temperature range of 60 to 80 ° C, and divide the synthesized superfine calcium carbonate into two steps. Perform wet modification. Among them, the first modifier is an emulsion formed by emulsifying stearic acid and a certain amount of white oil through caustic soda solution, and the second modifier is an emulsion formed by emulsifying paraffin wax with ammonia water. The method of the invention has high production efficiency, easy control of the production process, and stable product quality. The product is specially used as a filler for room temperature vulcanized silicone rubber, which can significantly improve the dispersibility of calcium carbonate in the base material, improve the appearance of the silicone rubber, and endow the silicone The glue has good thixotropy, storage stability, bond strength, mechanical strength and water resistance, and has remarkable economic benefits.
Description
Technical field [0001] The invention relates to a surface modification method of nanometer calcium carbonate. Background technique [0002] Calcium carbonate has stable performance, low price, and large filling capacity. It is widely used as a filler for silicone rubber. The defects caused by the system are easy to flow, poor extrudability, and low strength. It can replace expensive fumed silica in large quantities, and has high practical value. Unmodified nano-calcium carbonate has a large specific surface area and high surface energy, and the particles are easily agglomerated, which affects its uniform dispersion in the silicone rubber base. Therefore, surface modification must be carried out on the nano-calcium carbonate. At present, the surface modification of nano-calcium carbonate is usually wet modification, that is, at a certain temperature, a certain amount of modifier is added to the synthesized calcium carbonate slurry, and the modifier is added to the calcium ca...
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