Method for preparation of silicon oil by silicon oil byproduct

A silicone oil by-product, silicone oil technology, applied in the field of production of dimethyl silicone oil, to achieve the effect of easy control of viscosity, simple process and simple reaction process

Inactive Publication Date: 2010-07-28
SHANDONG DONGYUE ORGANIC SILICON MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hereinafter referred to as silicone oil by-products

Method used

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  • Method for preparation of silicon oil by silicon oil byproduct
  • Method for preparation of silicon oil by silicon oil byproduct
  • Method for preparation of silicon oil by silicon oil byproduct

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Through the calculation formula of raw material composition Table 1 and MM' and D', it is calculated that MM' accounts for 44.98%, D' accounts for 44.09%, and unknown substance accounts for 10.93% in the silicone oil by-product; MM' accounts for 0.96% in the mixed ring body, D' Accounted for 97.22%, unknowns accounted for 1.82%.

[0042] Taking D' / MM' of different proportions as the abscissa, and the viscosity of the corresponding target product silicone oil as the ordinate, a curve can be obtained, which can show the relationship between the ratio of raw materials (D' / MM') and the viscosity of silicone oil (η ) between the quantitative relationship, such as figure 1 . pass figure 1Raw material ratio D' / MM' and silicone oil viscosity η, design and prepare dimethyl silicone oil with a viscosity of 10cs, calculate the feed ratio of silicone oil by-products and mixed rings to be 90.64 parts of silicone oil by-products and 264.02 parts of mixed rings. Add the calculated ...

Embodiment 2

[0044] Raw material composition is as described in embodiment 1. pass figure 1 Raw material ratio D' / MM' and silicone oil viscosity η, design and prepare dimethyl silicone oil with a viscosity of 100cs, calculate the feed ratio of silicone oil by-products and mixed rings to be 6.21 parts of silicone oil by-products and 159.95 parts of mixed rings. Add the calculated silicone oil by-products and mixed rings into the three-necked flask, add styrene-divinyl macroporous strong acid cation exchange resin with 5% of the total mass of reactants as a catalyst, heat to 80°C, and telomerize for 3.5 hours. After the polymerization is completed, the obtained solid-liquid mixture is filtered under pressure, and the product is separated from the catalyst macroporous strong acidic cation exchange resin. The obtained filtrate is delowered under reduced pressure at 180°C and the pressure is -1.033KPa, and the time is 3 hours. Removal of low molecular weight results in obtaining simethicone oi...

Embodiment 3

[0046] Raw material composition is as described in embodiment 1. Through raw material ratio D' / MM' and silicone oil viscosity η figure 1 , designed to prepare dimethyl silicone oil with a viscosity of 500cs, and calculated the feed ratio of silicone oil by-products and mixed rings to be 9.72 parts of silicone oil by-products and 457.90 parts of mixed rings. Add the calculated silicone oil by-products and mixed rings into the three-necked flask, add styrene-divinyl macroporous strong acid cation exchange resin with 8% of the total mass of reactants as a catalyst, heat to 100°C, and telomerize for 5 hours. After the polymerization is completed, the obtained solid-liquid mixture is filtered under pressure, and the product is separated from the catalyst macroporous strong acidic cation exchange resin. In addition to low molecular weight, simethicone oil with a viscosity of 495.5 cs was obtained, and the single-pass conversion rate of this simethicone oil was 85.1%.

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Abstract

The invention relates to a method for the preparation of silicon oil by silicon oil byproduct, in which dimethyl silicon oil byproduct in acid method production is used as raw material to prepare low-viscosity dimethyl silicone coil under the catalysis of solid acid catalyst. The method comprises the steps: calculating the constitution of raw materials in the silicon oil byproduct and drawing a proportion-viscosity relationship curve of the raw materials to set a feeding ratio, controlling reaction temperature between 50 and 110 DEG C under the catalyst of 3%-15% of solid catalyst, and implementing telomerization for 2 to 6 hours. By reutilizing the silicon oil byproduct, the method solves the problem of warehouse occupation of the silicon oil byproduct and lowers production cost. Using the solid acid catalyst can directly prepare neutral equilibration reaction product without neutralization and water washing procedures, the reaction process is simple, the viscosity of the product is easy to control and the regenerated byproduct can still be used repeatedly.

Description

technical field [0001] The invention relates to a method for preparing silicone oil, in particular to a method for producing simethicone by-product of simethicone. technical background [0002] Dimethyl silicone oil has good thermal stability, electrical insulation, low viscosity-temperature coefficient, low surface tension, and aging resistance. It has been widely used in machinery, electricity, textiles, coatings, medicine, etc., so domestic External demand is increasing. In industrial production, simethicone oil is generally made of low molar mass dimethylcyclosiloxane (D 4 Or DMC) and trimethylsiloxy-terminated low molar mass dimethyl polysiloxane (MDnM) prepared by equilibrium reaction. Other common methods include: co-hydrolysis of dimethyldichlorosilane and trimethylchlorosilane, and further polycondensation; hydrolyzate of dimethyldichlorosilane and hexamethyldisiloxane for equilibrium reaction and low A molar amount of dimethicone diol is condensed with trimethyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/04C08G77/08C08G77/32
Inventor 刘娜桑圣凯胡生祥付佃亮
Owner SHANDONG DONGYUE ORGANIC SILICON MATERIAL
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