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Preparation method of nanometer calcium carbonate applied to silicone sealant of electronic appliance

A technology of nano-calcium carbonate, electronic appliances, applied in the direction of chemical instruments and methods, adhesives, non-polymer adhesive additives, etc., can solve the problem of inability to effectively exert the performance of nano-calcium carbonate, poor dispersion of ordinary nano-calcium, and nano-particles Serious problems such as agglomeration, to achieve the effect of improving elasticity, uniform particle distribution, and uniform dispersion

Inactive Publication Date: 2019-08-27
宣城新威华化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heavy calcium carbonate is mainly used as an incremental filler, light calcium carbonate is used as a semi-reinforcing filler but the reinforcing effect is poor, active calcium carbonate has a reinforcing effect; and nano-calcium carbonate can improve the mechanical properties of room temperature vulcanized silicone rubber, but Ordinary nano-calcium usually has problems such as poor dispersion, serious nano-particle agglomeration, and uneven particle distribution. The performance of nano-calcium carbonate cannot be effectively exerted in silicone glue.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing nano-calcium carbonate applied to silicone glue for electronic appliances, the preparation method comprising:

[0020] Add 0.8 cubic meters of Ca(OH) with a concentration of 90% in a carbonization kettle of 1 cubic meter 2 Slurry, add 0.08kgNa before carbonization reaction 2 CO 3 and 0.9kg sugar mixture, the carbonization start temperature is 25°C, and CO is introduced 2 The kiln gas with a content of 20-30% is carbonized, and the flow rate of the kiln gas is 7m 3 / h, add 0.08kg sodium silicate and 0.02kg aluminum silicate after carbonization for 1h, and then continue carbonization until the pH value reaches 7, to obtain uniformly dispersed nano-calcium carbonate slurry, put the carbonized slurry into the aging equipment change.

[0021] Add 40L of water into a 60L reaction kettle, raise the temperature to 85°C, add 1.6kg of stearic acid and 0.3kg of sodium hydroxide into the reaction kettle, stir for 20 minutes, then add 1.2kg of palm oil, an...

Embodiment 2

[0024] A method for preparing nano-calcium carbonate applied to silicone glue for electronic appliances, the preparation method comprising:

[0025] Add 0.8 cubic meters of Ca(OH) with a concentration of 105% in a carbonization kettle of 1 cubic meter 2 Slurry, add a mixture of 0.08kg citric acid and 0.3kg sugar before the carbonization reaction, the carbonization start temperature is 35°C, and CO is introduced 2 The kiln gas with a content of 20-30% is carbonized, and the flow rate of the kiln gas is 7m 3 / h, add 0.06kg sodium hexametaphosphate and 0.05kg aluminum silicate after carbonization for 1h, and then continue carbonization until the pH value reaches 7 to obtain uniformly dispersed nano-calcium carbonate slurry, and place the carbonized slurry into an aging device aged.

[0026] Add 40L of water into a 60L reaction kettle, raise the temperature to 85°C, add 1.9kg of stearic acid and 0.22kg of sodium hydroxide into the reaction kettle, stir for 20 minutes, then add 0...

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Abstract

The invention discloses a preparation method of nanometer calcium carbonate applied to a silicone sealant of an electronic appliance. The preparation method includes the steps of adding a crystal formcontrolling agent to a calcium hydroxide suspension for carbonization, adding a dispersing agent in the carbonization process to continue carbonization until the carbonization is completed, then carrying out aging, coating the aged nanometer calcium carbonate slurry by use of an aqueous solution of a surface treatment agent, carrying out filtering, carrying out drying and carrying out pulverizingto obtain the nanometer calcium carbonate applied to the silicone sealant of the electronic appliance. The nanometer calcium carbonate prepared by the preparation method has a crystal form of a cube,a particle diameter of 80-100 nm, a specific surface area of 22 m<2> / g or above, an oil absorption value of 28 g / 100 g of CaCO3, uniform particle distribution, no agglomeration phenomenon, and good dispersibility and thixotropy in the silicone sealant, and can significantly improve the elasticity, strength, thixotropic and adhesiveness of the silicone sealant of the ecteronic appliance.

Description

technical field [0001] The invention relates to a method for preparing nanometer calcium carbonate applied to silicone glue for electronic appliances, and belongs to the technical field of nanometer material preparation. Background technique [0002] Because of its good electrical insulation and arc resistance, room temperature vulcanized silicone rubber is widely used in bonding, sealing, potting, etc. of electronic components, semiconductor materials, and electronic appliances. Silicone sealant is a kind of room temperature vulcanized silicone rubber. It is a new type of silicone elastomer. At present, there are widely used deketoxime type, dealcoholized type, deacetic acid type and dehydroxylamine type, dealcoholized silicone. The sealant is non-corrosive and can be used as an adhesive or sealant in the field of electronic appliances. [0003] The commonly used fillers for dealcoholized silicone sealants include white carbon black, calcium carbonate, diatomaceous earth, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C09C3/06C09J11/04C09J183/04
CPCC01P2004/38C01P2004/64C01P2006/12C01P2006/19C01P2006/22C08K2003/265C08K2201/003C08K2201/006C08K2201/011C09C1/021C09C3/006C09C3/06C09C3/08C09J11/04C09J183/04C08K9/10C08K3/26
Inventor 钟腾松蒋旭华
Owner 宣城新威华化工科技有限公司
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