Silicone composition

A technology of silicone and composition, applied in the field of cross-linkable silicone composition, can solve the problems of poor anti-foaming performance, high viscosity of silicone polymer, single structure, etc., achieve good anti-foaming performance, enhance application performance, the effect of improving foam suppression performance

Active Publication Date: 2019-09-27
JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As early as 1968, research on the preparation of organopolysiloxane defoamers had already begun abroad. For example, in US3383327, polydimethylsiloxane was used as the main body to prepare defoamer compositions. However, due to its single structure, Foam suppression performance is poor
In later studies, US3455839 described a method for preparing a crosslinkable organopolysiloxane defoamer composition, and proposed for the first time the process of using vinyl polysiloxane to react with hydrogen-containing polysiloxane to improve The anti-foaming ability of the defoaming agent in the later stage is improved, but it still has some deficiencies in the defoaming performance; US4690713 points out that vinyl groups and phenyl groups have been introduced into polyorganosiloxane, and in the platinum catalyst catalyzed Cross

Method used

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  • Silicone composition
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Add 100g of (Me) with a viscosity of 90mPa.s into the reactor 2 HSiO(Me 2 SiO) 50 (MeHSiO) 20 SiH(Me) 2 , 40g of silicone resin (M:Q=0.5:1.0), 493g of polymethylsiloxane with a viscosity of 500mPa.s, 12g of CH 2 =CHCH 2 (EO) 20 (PO) 60 Unsaturated polyether of H; mix well and heat up to 50°C, add 0.005g of 1% chloroplatinic acid isopropanol solution, keep warm at 50°C and continue to react for 2 hours, then add 300g of H(Me) with a viscosity of 3000mPa.s 2 SiO(Me 2 SiO) 500 (MeViSiO) 40 SiH(Me) 2 , mix well and continue to react at 50°C for 2h; (2) Continue to add 14.995g of potassium hydroxide-isopropanol solution to the composition of step (1), and raise the temperature to 100°C for 1h; keep warm and add 40g specific surface area of 300m 2 / g of precipitated hydrophobic silica, mixed and stirred, continued to react at 100°C for 1 h, cooled to room temperature, and obtained organosilicon composition S1.

Embodiment 2

[0040] (1) Add 50g of (Me) with a viscosity of 500mPa.s into the reactor 2 HSiO(Me 2 SiO) 200 (MeHSiO) 30 SiH(Me) 2 , 80g of silicone resin (M:Q=0.8:1.0), 400g of polymethylsiloxane with a viscosity of 2000mPa.s, 10g of CH 2 =CHCH 2 (EO) 40 (PO) 30 Unsaturated polyether of H; mix well and add 0.01g of 1% isopropanol solution of chloroplatinic acid when the temperature rises to 50°C, continue to heat up to 90°C and react for 1 hour, then add 400g of H(Me) with a viscosity of 100,000mPa.s 2 SiO(Me 2 SiO) 1500 (MeViSiO) 300 SiH(Me) 2 , mix well and continue to react at 90°C for 0.5h; (2) step (1) continue to add 10g potassium hydroxide-isopropanol solution to the composition, and raise the temperature to 140°C for 30min; keep warm and add 49.99g specific surface area of 500m 2 / g of fumed hydrophobic silica, mixed and stirred, continued to react at 140°C for 30min, cooled to room temperature, and obtained organosilicon composition S2.

Embodiment 3

[0042] (1) Add 190g of (Me) with a viscosity of 40mPa.s into the reactor 2 HSiO(Me 2 SiO) 35 (MeHSiO) 15 SiH(Me) 2 , 40g of silicone resin (M:Q=0.6:1.0), 500g of polymethylsiloxane with a viscosity of 1000mPa.s, 15g of CH 2 =CHCH 2 (EO) (PO) 40 Unsaturated polyether of H; mix well and add 0.008g of 1% isopropanol solution of chloroplatinic acid when the temperature rises to 50°C, continue to heat up to 70°C and react for 0.8h, then add 300g of H(Me) with a viscosity of 5000mPa.s 2 SiO(Me 2 SiO) 600 (MeViSiO) 60 SiH(Me) 2 , mix well and continue to react at 70°C for 1.5h; (2) step (1) continue to add 15.008g of potassium hydroxide-isopropanol solution to the composition, and raise the temperature to 120°C for 0.6h; keep warm and add 40g of specific surface area 50m 2 / g of precipitated hydrophobic silica, mixed and stirred, continued to react at 120°C for 30min, and cooled to room temperature to obtain organosilicon composition S3.

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Abstract

The invention provides a silicone composition and a preparation method thereof. A hydrogen-containing polysiloxane reacts with an unsaturated polyether, and the obtained reaction product and a dimethylhydro-terminated vinyl polysiloxane undergo a hydrosilylation reaction and alkali treatment. The crosslinking viscosity is effectively controlled by the hydrogen-containing polysiloxane to form a dynamic crosslinked polymer having a spatial structure, and the addition of the unsaturated polyether improves the dispersing property of the silicone composition. The silicone composition can be used as a main body to prepare an organopolysiloxane defoamer, has a good defoaming performance in a high-temperature strong alkaline system, and has the advantages of good dispersibility, difficulty in agglomeration and precipitation, improvement of the foam suppression performance, and enhancement of the application performance in the later stage in the use process.

Description

technical field [0001] The invention relates to a crosslinkable organic silicon composition, which belongs to the technical field of fine chemical preparations. Background technique [0002] The paper industry is an important industry that is closely related to the development of the national economy. Although defoamers are used in a small amount in the paper industry, they play an extremely important role. In the pulping process of the paper industry, since the pulp contains a large amount of fatty acid soap, resin acid soap foaming substances, and cellulose foam stabilizing substances, pulp transportation is prone to produce a large amount of foam, which brings unnecessary The trouble and loss of alkaline slurry also bring health problems to production workers. Early paper mills used the method of "clear water pressure foam" to suppress the generation of foam, but the effect was not satisfactory. With the rise of the silicone industry and people's increasing attention to...

Claims

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Application Information

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IPC IPC(8): C08G77/46C08K3/36
CPCC08G77/46C08K3/36
Inventor 杨有忠孙超曹添黄伟
Owner JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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