Surface modification method of nano-grade calcium carbonate used in room-temperature vulcanized silicone adhesive
A nano-calcium carbonate and vulcanized silicone technology is applied in the directions of adhesives, dyed low-molecular-weight organic compounds, fibrous fillers, etc. Stable product quality, enhanced effect, improved hydrophobicity and dispersibility
Active Publication Date: 2013-12-04
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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Problems solved by technology
However, due to the high pH of the surface-treated calcium carbonate after saponification of stearic acid by strong alkali, the water resistance of filled room temperature vulcanized silicone rubber is poor, and it is prone to gelation, which greatly shortens the storage period of the finished rubber and even makes it unusable.
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[0025] 1. Preparation of nano calcium carbonate slurry
[0026] CaCO 3 Limestone with a content greater than 98.5% is calcined at 1050°C for 3 hours to obtain quicklime; quicklime and water are fully digested at a temperature of 90±5°C in a mass ratio of 1:4 to obtain slaked lime slurry; the lime slurry is sieved to remove slag and diluted with water to Ca(OH) 2 Solid content 8.5±0.5%; CO 2 Lime kiln gas with a volume concentration of 30±2% is fed into the lime slurry to react until the pH of the system is 8.5 to prepare nano calcium carbonate slurry. The specific surface area of the dried powder of nano-calcium carbonate slurry is 24.3m 2 / g and 32.4m 2 / g two kinds, the grain size is 80nm and 50nm respectively, showing a cubic regular shape.
[0027] 2. Modification of nano calcium carbonate
[0028] (1) adding the above-mentioned nano-calcium carbonate slurry into a reaction kettle, controlling the temperature at 85-95° C., and stirring to obtain a nano-calcium carb...
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Abstract
The invention discloses a surface modification method of nano-grade calcium carbonate used in room-temperature vulcanized silicone adhesive. According to the invention, nano-grade calcium carbonate with a specific surface area of 18-60m<2> / g is prepared into a slurry with a pH value of 8.5-9; the slurry is added into a reaction vessel, and is stirred under a temperature of 85-95 DEG C, such that a suspension slurry is obtained; fatty acid with a mass of 1.8-6.0% of that of the nano-grade calcium carbonate and urea with a mass of 10-40% of that of the fatty acid are added to the suspension slurry; the mixture is stirred for 30-200min, such that modification is finished; the material is filtered, and is dried by using hot air with a temperature of 85-150 DEG C, such that a modified product is obtained. With a nano-grade calcium carbonate wet-method surface modification technology, fatty acid is hard to disperse in water. With the method provided by the invention, the defect is overcome; hydrophobicity and dispersity of nano-grade calcium carbonate are effectively improved; a technical problem of over-high pH value is avoided; the product quality is stable; a substantial enhancing effect is provided; the room-temperature vulcanized silicone adhesive is provided with excellent thixotropy, good water resistance and long shelf life; and the product can be used for replacing a certain part of expensive nano-grade SiO2. Therefore, substantial economic and social benefits are provided.
Description
Technical field: [0001] The invention relates to a method for modifying the surface of inorganic materials, in particular to a method for modifying the surface of room temperature vulcanized silicone glue with nanometer calcium carbonate. technical background: [0002] Silicone glue has excellent elasticity, chemical corrosion resistance and high and low temperature performance. It is an indispensable bonding and sealing material in the fields of construction, automobiles, solar energy, transportation, electronics, etc. It is also an important new material for environmental protection and energy-saving industrial applications. Room temperature vulcanized silicone rubber has excellent toughness, but its strength is low, and silicone rubber without reinforcement treatment has basically no practical value. The application of high-quality nano-calcium carbonate to polymer materials can not only play the role of incremental filling, but also endow some polymer composite materials...
Claims
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IPC IPC(8): C09C1/02C09C3/08C08L83/04C08K9/10C08K9/04C08K3/26C09J183/04C09J11/04
Inventor 朱勇王权广黄炜民黄炜波黄安定
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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