Prepartion method of highly anti-yellow resistance white carbon black for silastic

A silicone rubber and silica technology, which is applied in the treatment of silicon oxide, silicon dioxide, dyed low molecular organic compounds, etc., can solve the problems of easy yellowing, low stability and high price of silicone rubber, and achieve stable product quality. Reliable, increase dispersion, eliminate the effect of hue change

Active Publication Date: 2009-11-25
FUJIAN ZHENGSHENG INORGANIC MATERIAL
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  • Abstract
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AI Technical Summary

Problems solved by technology

At present, silica for silicone rubber is mainly produced by precipitation method. The production process is to dissolve solid water glass and react with acid to form silica precipitate, which is then obtained by pressure filtration, washing and drying; precipitation method silica has It has the advantages of low cost, small investment, and light structural phenomena, but has the disadvantages of many impurities, translucence, many factors affecting quality, and poor stability. It is used for silicone rubber that is easy to yellow, and can only be achieved by reducing or controlling the content of impurities. The method achieves limited anti-yellowing effect, has no anti-yellowing effect, and has low stability
Fumed silica has the advantages of less impurities, fine particle size (nano-scale), high transparency, and anti-yellowing, but it has large investment, high production cost, expensive price, and serious structure. It is gradually favored by precipitation method in the field of silicone rubber. replace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The specific operation steps are as follows:

[0031] 1. Refined water glass

[0032] Take 40m 3 After the liquid water glass dissolved by the steaming ball is left to stand for clarification, the supernatant liquid is taken to make a concentration of 20% liquid water glass for subsequent use.

[0033] 2. Preparation of compound anti-yellowing agent B

[0034] Add 100L of absolute ethanol, 10L of tetramethylcyclotetrasiloxane, and 10L of non-ionic silane coupling agent A-1230 into a 500L enamel kettle with agitation in sequence, stir evenly and set aside.

[0035] 3. Synthesis of silica and anti-yellowing treatment

[0036] at 50m 3 Add 22m to the reactor 3 Process water, heat up to 80°C, add 20% liquid water glass 1.1m 3 ~1.2m 3 , adjust the pH to 9-10, under the condition of stirring, add 98% concentrated sulfuric acid and 20% liquid water glass dropwise in proportion at the same time, the concentrated sulfuric acid is added dropwise at about 0.4m 3 ~0.5m 3 ,...

Embodiment 2

[0049] The specific operation steps are as follows:

[0050] 1. Refined water glass

[0051] Take 50m 3 After the liquid water glass dissolved by the steaming ball is left to stand for clarification, the supernatant liquid is taken to make a concentration of 20% liquid water glass for subsequent use.

[0052] 2. Preparation of compound anti-yellowing agent B

[0053] Add 200L of absolute ethanol, 20L of tetramethylcyclotetrasiloxane, and 20L of non-ionic silane coupling agent A-1230 into a 500L enamel kettle with stirring in sequence, stir well and set aside.

[0054] 3. Synthesis of silica and anti-yellowing treatment

[0055] at 50m 3 Add 20m to the reactor 3 Process water, heat up to 80°C, add 20% liquid water glass 0.9m 3 ~1.0m 3, adjust the pH to 9-10, under the condition of stirring, add concentrated sulfuric acid and 20% liquid water glass dropwise in proportion at the same time, the concentrated sulfuric acid is added dropwise about 0.4m per hour 3 ~0.5m 3 , 2...

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Abstract

The invention discoses a prepartion method of highly anti-yellow resistance white carbon black for silastic, processing steps include dissolution and refining of solid soluble glass, precipitation reaction of the soluble glass and concentrated sulfuric acid under function of organic surface active agent, after synthetic reaction, homemade composite anti-yellow agent B is used to proceed anti-yellow treatment to surface of silicon dioxide particles, then through filter pressing, washing, liquefaction of filter cake, spray drying and semi-finished product collecting, crushing and grading, and products collecting to obtain highly anti-yellow resistance white carbon black for silastic. White carbon black produced according to the method has advantages of stable and reliable quality, excellent anti-yellow performance, which solves crucial problem of easily yellowing in white carbon black in precipitation method for silastic.

Description

1. Technical field [0001] The invention relates to a method for manufacturing an inorganic functional powder material, in particular to a method for preparing white carbon black used for silicone rubber. 2. Background technology [0002] Precipitated silica is an extremely widely used inorganic functional powder material, mainly used in ordinary rubber, silicone rubber, coatings, inks, pesticides, papermaking and other fields. The production methods of silica used for silicone rubber are mainly gas phase method and precipitation method. At present, silica for silicone rubber is mainly produced by precipitation method. The production process is to dissolve solid water glass and react with acid to form silica precipitate, which is then obtained by pressure filtration, washing and drying; precipitation method silica has It has the advantages of low cost, small investment, and light structural phenomenon, but has the disadvantages of many impurities, translucence, many factors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C08K9/06C09C1/28C09C3/08
Inventor 谭玉泉汤道英
Owner FUJIAN ZHENGSHENG INORGANIC MATERIAL
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