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Preparation method of nano calcium carbonate capable of improving bonding strength of oxime-removing silicone sealant

A technology of nano-calcium carbonate and silicone sealant, which is applied in the field of materials, can solve problems such as limited application range, corrosiveness of copper, poor mechanical strength and adhesion, and achieve superior performance, high tensile strength, and easy operation Effect

Active Publication Date: 2014-04-30
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

Deoxime type silicone sealant is composed of methyl triacetone oxime silane, methyl tributanone oxime silane organic tin, organic amine, odorless, neutral, generally non-corrosive to objects, good oil resistance, but its mechanical strength and Poor adhesion, corrosive to copper, thus limiting its range of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 0.8 cubic meters of calcium carbonate mass percent to 90% Ca(OH) in a carbonization kettle of 1 cubic meter 2 Slurry, a mixture of 0.06kg sodium carbonate and 0.1kg sugar was added before the reaction, the carbonization starting temperature was 11°C, and the 2 The kiln gas with a content of 25% is carbonized, and the flow rate of the kiln gas is 7m 3 / h, carbonize for 1 hour, add 0.05kg sodium silicate and 0.05kg aluminum silicate after the carbonization rate reaches 55%, and then continue carbonization until the pH value reaches 7, and get a uniformly dispersed nano-calcium carbonate slurry for use;

[0019] Add 40L of water into a 60L reactor, raise the temperature to 85°C, add 1.5kg of stearic acid and 0.2kg of sodium hydroxide into the reactor, stir for 20 minutes, then add 1kg of palm oil, and continue stirring for 30 minutes to make a surface treatment Then add the surface treatment agent solution to the nano-calcium carbonate slurry that has been heated to 9...

Embodiment 2

[0022] Add 0.8 cubic meters of calcium carbonate mass percent to 100% Ca(OH) in a carbonization kettle of 1 cubic meter 2 Slurry, a mixture of 0.08kg sodium chloride and 0.15kg citric acid was added before the reaction, the carbonization starting temperature was 30°C, and CO 2 The kiln gas with a content of 28% is carbonized, and the flow rate of the kiln gas is 7m 3 / h, carbonization 1 hour, after the carbonization rate reaches 65%, add 0.07kg sodium silicate and 0.07kg sodium pyrophosphate, then continue carbonization until the pH value reaches 7, get the evenly dispersed nano-calcium carbonate slurry for use;

[0023] Add 40L of water into a 60L reactor, raise the temperature to 85°C, add 1.7kg of stearic acid and 0.21kg of sodium hydroxide into the reactor, stir for 20 minutes, then add 1kg of calcium stearate, and continue stirring for 30 minutes to obtain surface treatment agent solution, and then add the surface treatment agent solution to the nano-calcium carbonate sl...

Embodiment 3

[0026] Add 0.8 cubic meters of calcium carbonate mass percent to 110% Ca(OH) in a carbonization kettle of 1 cubic meter 2 Slurry, add a mixture of 0.06kg citric acid and 0.2kg sugar before the reaction, the carbonization start temperature is 45°C, and pass through the 2 The kiln gas with a content of 30% is carbonized, and the flow rate of the kiln gas is 7m 3 / h, add 0.05kg sodium hexametaphosphate and 0.05kg aluminum silicate after carbonization for 1 hour, then continue carbonization until the pH value reaches 7, and get evenly dispersed nano-calcium carbonate slurry for use;

[0027] Add 40L of water into a 60L reactor, raise the temperature to 85°C, add 1.8kg of stearic acid and 0.22kg of sodium hydroxide into the reactor, stir for 20 minutes, then add 1kg of corn oil, and continue stirring for 30 minutes to make a surface treatment Then add the surface treatment agent solution to the nano-calcium carbonate slurry that has been heated to 75°C, treat the surface at a cons...

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Abstract

The invention relates to a preparation method of nano calcium carbonate capable of improving bonding strength of an oxime-removing silicone sealant. The preparation method has the characteristics that in the preparation process, the crystal morphology and growth rate of the crystal face are controlled according to the principle of crystallization to realize required crystal morphology and grain size; a certain amount of a dispersant is added into the carbonization process, and then strong stirring is performed, so that surface charge and steric hindrance are effectively controlled after nano calcium carbonate carbonization is terminated; surface treatment is carried out on nano calcium carbonate slurry under a certain process condition after particles in the nano calcium carbonate slurry are uniformly dispersed to further improve the steric hindrance and more uniformly disperse the particles; excellent nano calcium carbonate capable of improving bonding strength of the oxime-removing silicone sealant can be produced on an industrial device.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of nano-calcium carbonate capable of improving the adhesive strength of deoxime-type silicone sealant. Background technique [0002] Silicone sealant is a kind of room temperature vulcanized silicone rubber (RTV), which is a new type of silicone elastomer. One-component RTV silicone rubber is generally composed of the following components: the reactive base polymer (commonly known as base rubber) is hydroxyl-terminated polydiorganosilane; the crosslinking agent is a multifunctional silane compound containing hydrolyzable groups; the catalyst is organotin ; The filler is white carbon black, calcium carbonate, etc.; the plasticizer is non-reactive dimethyl silicone oil, etc. Classification of silicone sealants: There are many types of crosslinking agents for silicone sealants, and the chemical structure of the crosslinking agent is one of the mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/06C09C3/08C09C3/12B82Y30/00C09J11/04C09J183/06
Inventor 张新平钟腾松
Owner 宣城新威华化工科技有限公司
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