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Method for preparing low-viscosity polymer polyol

A polyol and polymer technology, applied in the field of low-viscosity polymer polyols, can solve the problems of increased product viscosity, poor dispersion stability, and reduced conversion rate, and achieve the effect of low viscosity

Inactive Publication Date: 2013-10-09
CHINA PETROLEUM & CHEM CORP
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Problems solved by technology

The disadvantage of this method is that with the increase of styrene content, the viscosity of the product increases, the conversion rate decreases, and the dispersion stability of the system becomes poor.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0021] Scheme 1 This scheme is suitable for synthesizing a polymer polyol with a solid content of 30-35% based on the total weight of the polymer polyol.

[0022] Two 250ml four-neck flasks are used as series reactors, all of which are equipped with stirrer, heating device, temperature control device and feeder. First, a polymer polyol with a solid content of 30% is added to the reactor as a primer, 61.2 parts of polyether polyol, 21 parts of styrene, 14 parts of acrylonitrile, 0.4 part of n-dodecyl mercaptan, 3 parts Unsaturated macromolecular monomers and 0.4 parts of azobisisobutyronitrile are used as topping materials. The bottom material is heated to 110°C and the top material is continuously added, and the reaction temperature is controlled at 110°C to 125°C. The feeding time is 4 to 5 hours, and the overflow material is collected. After the feeding is completed, the overflow material is vacuumized to remove volatile substances and unreacted monomers, and the product A...

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Abstract

The invention relates to a method for preparing a low-viscosity polymer polyol. According to the method, a continuous process is adopted, namely a polymer polyol with solid content equal to or lower than that of a target product is adopted as a base material, all remaining raw materials are blended and then are dropwise added continuously, a polyoxyalkylene polyether polyol serves as a continuous phase during reaction, a mixture of styrene and acrylonitrile is subjected to in-situ polymerization in the presence of a certain amount of an azo free radical initiator, a maleate-polyether half-ester unsaturated macromolecular monomer and an alcohol molecular weight control agent so as to form a stable polymer polyol system, and the polymer polyol is provided with the continuous phase containing a polyoxyalkylene polyol and a disperse phase containing vinyl polymer solids. According to the method, a polymer polyol product, of which the particle morphology of the disperse phase is approximately spherical, the surface is more smooth and the particle diameter distribution of particles is wider, can be obtained, and the obtained polymer polyol product has the characteristic of low viscosity.

Description

technical field [0001] The present invention relates to a low viscosity polymer polyol. By adopting continuous reaction preparation process, adjusting the amount of free radical initiator, unsaturated macromonomer and molecular weight control agent in raw materials, and adjusting the ratio of monomers in mixed vinyl monomers, a stable polymer polyol is formed system. Background technique [0002] Polymer polyol is a bulk industrial product, which can endow polyurethane products with good load-bearing properties and improve the open cell of foam. It is mainly used in the production of block flexible foam, high resilience flexible foam and molded flexible foam of polyurethane. Polymer polyol is formed by in-situ polymerization of one or several vinyl monomers with basic polyether polyol as the continuous phase. Commercially useful polymer polyols were first developed by American Paul Stamberger, and began to apply for a number of patents in the 1960s. Subsequently, various...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F283/06C08F212/10C08F220/44C08F2/38C08G18/63
Inventor 郝敬颖李玉松朱姝
Owner CHINA PETROLEUM & CHEM CORP
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