Preparation method for 107 silicon rubber with controllable viscosity

A technology of silicone hydroxyl sealing and polydimethylsiloxane, which is applied in the field of polydimethylsiloxane preparation technology, can solve the problems of difficult dispersion, low reactivity, poor product transparency, etc., and save production costs , Improve product quality and improve production efficiency

Active Publication Date: 2010-12-29
浙江中天东方氟硅材料股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sodium carbonate cannot completely remove the chloride ions in the hydrolyzate, so the chloride ion content is generally high, generally around 1000ppm in China, and above 200ppm in foreign countries. High chloride ion content will inevitably affect the polymerization speed, viscosity or degree of polymerization of the hydrolyzate. , because the added basic catalyst will be consumed by chloride ions first
And adopt KOH aqueous solution as catalyzer, because potassium hydroxide aqueous solution density is bigger than hydrolyzate, easily settle to th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0010] Example 1:

[0011] Add 3500g of dimethyldichlorosilane hydrolyzate and 70g of 5% NaOH solution in a 5000mL reactor, stir, control the temperature at 90°C, react for 3 hours, remove the water layer by layers, wash the hydrolyzate with distilled water to neutrality . The temperature was controlled at 70°C, and the water was removed under the vacuum degree of 0.05MPa, and the low boiling water carried in the removed water was returned to the reaction kettle by the balance pipe. Then the temperature was raised to 110°C, 7g of alkali glue with a concentration of 1% tetramethylammonium hydroxide was added by spraying, catalyzed polymerization, and controlled by an on-line viscometer. Above MPa, the catalyst is decomposed, and low molecules are removed at the same time, and the transparency is good, and the viscosity is 5000~200000mm 2 / s of 107 silicone rubber.

Example Embodiment

[0012] Example 2:

[0013] Add 3500g dimethyldichlorosilane hydrolyzate and 105g 5% NaOH solution in a 5000mL reactor, stir, control the temperature at 90°C, react for 2 hours, remove the water layer by layers, wash the hydrolyzate to neutrality with distilled water . The temperature was controlled at 70°C, and the water was removed under the vacuum degree of 0.05MPa, and the low boiling water carried in the removed water was returned to the reaction kettle by the balance pipe. Then heat up to 100°C, spray and add 14 g of alkali glue with a concentration of 1% tetramethylammonium hydroxide, catalyze the polymerization, and control it with an online viscometer. Above MPa, the catalyst is decomposed, and low molecules are removed at the same time, and the transparency is good, and the viscosity is 5000~200000mm 2 / s of 107 silicone rubber.

Example Embodiment

[0014] Example 3:

[0015] 3500g of dimethyldichlorosilane hydrolyzate and 140g of 5% NaOH solution were added to a 5000mL reactor, stirred, and the temperature was controlled at 90°C, reacted for 2 hours, layered to remove the water layer, and washed the hydrolyzate with distilled water until neutral. . The temperature was controlled at 70°C, and the water was removed under the vacuum degree of 0.05MPa, and the low boiling water carried in the removed water was returned to the reaction kettle by the balance pipe. Then heat up to 120°C, spray and add 28g of alkali glue with a concentration of 1% tetramethylammonium hydroxide, catalyze the polymerization, and control it with an online viscometer. Above MPa, the catalyst is decomposed, and low molecules are removed at the same time, and the transparency is good, and the viscosity is 5000~200000mm 2 / s of 107 silicone rubber.

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Abstract

The invention relates to a method for producing linear hydroxyl-terminated polydimethylsiloxane, wherein the method comprises the following steps of: washing dimethyldichlorosilane hydrolysate serving as an initiative material to remove remained chloride ions; polymerizing the hydrolyzate in the presence of a basic size catalyst; after the polymerization reaches a certain degree, heating directly to decompose catalyze; ending the reaction; and removing low-boiling matters at the same time to obtain products. The linear hydroxyl-terminated polydimethylsiloxane produced by the invention has the characteristics of uniformly distributed molecular weight, controllable viscosity, good repeatability and the like.

Description

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Claims

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Application Information

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Owner 浙江中天东方氟硅材料股份有限公司
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