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Modified polysiloxane and preparation method thereof and application of modified polysiloxane as foam stabilizer for flexible polyurethane foam

A polysiloxane and modification technology, which is applied in the field of silicone foam stabilizer for polyurethane foam, can solve the problems of discounted emulsification effect, general compatibility of raw material oil phase, etc., to avoid mutual influence and interference, and increase hydrophilicity Effect of lipophilicity on dimensionality, large structural space

Active Publication Date: 2021-11-16
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the lipophilic group of ordinary foam stabilizers is pure silicone link, which has a general compatibility with the raw material oil phase, and cannot be well directional adsorbed at the liquid-liquid interface of the oil-water two-phase, and its emulsification effect will be reduced. Big discount

Method used

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  • Modified polysiloxane and preparation method thereof and application of modified polysiloxane as foam stabilizer for flexible polyurethane foam
  • Modified polysiloxane and preparation method thereof and application of modified polysiloxane as foam stabilizer for flexible polyurethane foam
  • Modified polysiloxane and preparation method thereof and application of modified polysiloxane as foam stabilizer for flexible polyurethane foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]

[0042] Put 600 parts of terminal hydrogen-containing silicone oil with a hydrogen content of 0.1361% and a degree of polymerization of 20 (terminal hydrogen-containing silicone oil, manufacturer Hengyecheng Organic Silicon Co., Ltd.) into a 1L reactor, and heat it to 120°C under nitrogen protection to remove water Afterwards, cool down to 80°C, according to the total hydrogen content of terminal hydrogen-containing silicone oil (600 parts * 0.1361% = 0.8166mol): hexadiene: p-1-butenyltoluene molar ratio is (2:1:2) At 80°C, add 33 parts of hexadiene and 119 parts of p-1-butenyltoluene, mix well, and add 0.002 parts of Castel catalyst (3ppm) (Castel catalyst was purchased from Shanghai Sibao High-tech Co., Ltd. Material Co., Ltd. PL-56 manufacturer), the temperature of the system rose rapidly, and after the temperature stopped rising, polymer (3) with a molecular weight of 3600 was obtained after the temperature was kept at 110° C. for 30 minutes (measured according t...

Embodiment 2

[0046]

[0047] Put 600 parts of terminal hydrogen-containing silicone oil (manufacturer Hengyecheng Organic Silicon Co., Ltd.) with a hydrogen content of 0.0904% into a 1L reaction kettle, heat it to 120°C to remove water under nitrogen protection, and then cool it down to At 90°C, add 20 parts of hexadiene, 71 parts of p-1-butenyltoluene, after mixing evenly, add 0.003 parts of 5ppm Castel catalyst, the temperature of the system rises rapidly, after the temperature no longer rises, after 30min at 110°C, a polymer with a molecular weight of 5082 is obtained Compound (3) (determined by viscosity and GPC).

[0048] In this reactor, under nitrogen protection, 99 parts of tetramethylcyclotetrasiloxane were added according to the molar ratio of polymer (3): tetramethylcyclotetrasiloxane (1:2). Add 1.6 parts of catalyst trifluoromethanesulfonic acid, react at 50 DEG C for 6 hours, then neutralize and filter to obtain polymer (2), learn that its molecular weight is 5322, and its...

Embodiment 3

[0051]

[0052] Put 600 parts of terminal hydrogen-containing silicone oil (produced by Hengyecheng Silicone Co., Ltd.) with a terminal hydrogen content of 0.0541% into a 1L reactor and heat it to 120°C to remove water. Afterwards, cool down to 100°C, add butadiene at 100°C according to the molar ratio of the total hydrogen content of terminal hydrogen-containing silicone oil: butadiene: p-1-butenyltoluene (2:1:2) 8.7 parts of alkenes, 47 parts of p-1-butenyltoluene, after mixing evenly, add 0.003 parts of Castel catalyst 5ppm, the temperature of the system rises rapidly, and after the temperature no longer rises, it is obtained after holding at 120°C for 30min Polymer (3) with a molecular weight of 8014 (determined by viscosity).

[0053] In this reaction kettle, under nitrogen protection, 59 parts of tetramethylcyclotetrasiloxane were added according to the molar ratio of polymer (3): tetramethylcyclotetrasiloxane (1:3). Add 1.4 parts of catalyst trifluoromethanesulfonic...

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Abstract

The invention provides modified polysiloxane and a preparation method thereof and application of the modified polysiloxane as a foam stabilizer for flexible polyurethane foam. The modified polysiloxane is characterized in that acarbon chain structure is embedded into a polysiloxane chain segment of a main chain while an inert methyl structure at a terminal position is subjected to certain substitution modification, so that the compatibility of the main chain and a polyurethane foaming oil-phase material is enhanced, the directional adsorption of the polyurethane foaming oil-phase material on a liquid-liquid interface is enhanced, and the surface tension of the polyurethane foaming oil-phase material is reduced; and macromolecular polyether chain link modification is carried out on the side chain, so that the solubilizing effect of the polymer is enhanced while the emulsifying effect of the polymer is enhanced. According to the foam stabilizer prepared by the method, the compatibility among the raw materials of the soft polyurethane foam is better, the foam stabilizer has better stability and foam stabilizer in the stages of foaming, nucleation, gelation, foam solidification and the like, the performance requirements of the polyurethane soft foam can be met, and the prepared foam can reach the foreign level.

Description

technical field [0001] The invention relates to the field of organosilicon foam stabilizer for polyurethane foam, in particular to a modified polysiloxane, a preparation method thereof and the use of the foam stabilizer for polyurethane soft foam. Background technique [0002] Polyurethane soft foam silicone oil, also known as foam stabilizer, foam stabilizer or foam stabilizer, is a modified polysiloxane surfactant and a very important auxiliary agent in the foaming process of polyurethane. The foaming process is a chemical reaction of various materials in a very short period of time, and changes from liquid to colloid and then to polymer. It undergoes at least 5 reactions, foaming, foam stabilization, foam solidification and other processes. The foam stabilizer ensures the smooth progress of various reactions in the polyurethane foaming process, supports the foam itself, and avoids adverse phenomena such as foam collapse, thick pores, and foam cracking. [0003] At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/46C08J9/00C08L75/04
CPCC08G77/46C08J9/0061C08J2375/04C08J2205/06
Inventor 高源张聪颖马伟曹骏封玲珑邱化敏杨继朋刘志峰
Owner WANHUA CHEM GRP CO LTD
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