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Preparation method and application of modified silica sol

A silica sol modification technology, which is applied in the treatment of dyed organic silicon compounds, dyed low molecular organic compounds, fibrous fillers, etc., can solve the problem of reducing the surface energy of silica sol, hardness and wear resistance can not meet the requirements, surface energy Low problems, to achieve the effect of good wear resistance, high hardness, low surface energy

Active Publication Date: 2014-05-21
HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low surface energy and unsatisfactory hardness and wear resistance of current non-stick coatings, the present invention proposes a modified silica sol and its preparation method. The modified silica sol can effectively reduce the surface energy

Method used

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  • Preparation method and application of modified silica sol
  • Preparation method and application of modified silica sol
  • Preparation method and application of modified silica sol

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0043] Synthesis Example 1: Preparation of Silica Sol

[0044] In 86.08% distilled water, add 12.92% silicon powder, activate it for 10 minutes, then continue to add 1.0% sodium silicate, stir vigorously at 90°C for 8 hours, then cool to below 50°C while stirring, and let stand overnight After vacuum filtration, SiO 2Particle size is 10.5nm, SiO 2 The solid content is 24%.

Synthetic example 2

[0045] Synthesis Example 2: Preparation of polyaluminocarbosilane

[0046] Put 500g of polydimethylsiloxane into a reaction vessel, crack it at 400°C under the protection of nitrogen, and the liquid obtained through the condenser tube is polysilocarbosilane; mix 100g of polysilocarbosilane with 5.5g of aluminum acetylacetonate, Under the protection of nitrogen, the temperature was raised to 500°C, and the temperature was kept for 5 hours. After the reaction was completed, it was cooled to room temperature, dissolved in isopropanol, filtered, and the filtrate was distilled at 90°C to obtain a light yellow liquid, namely polyaluminocarbosilane.

Embodiment 1

[0048] The silica sol (24% solid content, particle size 10.5nm) prepared in Synthesis Example 1 was 93.1%, dodecafluoroheptylpropyltrimethoxysilane 0.09%, n-butyl titanate 0.8%, 10% acetic acid solution 2.3% , 3.71% distilled water, stirred and reacted at 25°C for 24 hours to obtain modified silica sol 1 (10.5nm).

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Abstract

The invention relates to the field of non-stick coatings. In order to solve the problem that existing non-stick coatings are low in surface energy and the hardness and wear resistance cannot satisfy the requirements, the invention provides a modified silica sol and a preparation method thereof. The modified silica sol is prepared by the following steps: adding fluorosilane and titanium tetrabutoxide into the silica sol; then, adjusting the pH to 4-5; stirring at 20-60 DEG C; and maintaining for 1-8 hours to obtain the modified silica sol. According to the modified silica sol, the surface energy of the silica sol can be effectively reduced. The modified silica sol provided by the invention applied to non-stick coatings has the advantages of wear resistance, high hardness, good non-stick property and the like.

Description

technical field [0001] The invention relates to the field of non-stick coatings, in particular to a modified silica sol, a preparation method thereof, and a coating with strong wear resistance and high hardness prepared by using the silica sol. Background technique [0002] Silica sol is a stable colloidal dispersion formed by dispersing nano-silica particles in solvents such as water or alcohol, also known as silicic acid sol, or silica hydrosol. [0003] The hydroxyl groups on the surface of silica particles have strong activity, and some substances can react with the hydroxyl groups on the surface of silica particles to change the surface chemical properties of silica particles. For example, the patent CN 101338082A discloses a silica sol modified by a silane coupling agent and its preparation method and application. However, this patent adds organosilane and is mainly used in polishing fluids. The surface energy required for non-stick coatings is low. The characteristic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/12C09C3/08C09D7/12C09D183/10
Inventor 刘海兵朱海军钱涛李希郑成刘海清
Owner HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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