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Process for the preparation of prefabricated stabilizers and process for preparing polymer polyols therefrom

A technology for prefabricating stabilizers and polyols, applied in the field of preparing polymer polyols, can solve the problems of poor dispersion stability, reduced conversion rate, and increased product viscosity, etc.

Active Publication Date: 2018-12-04
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Process for the preparation of prefabricated stabilizers and process for preparing polymer polyols therefrom
  • Process for the preparation of prefabricated stabilizers and process for preparing polymer polyols therefrom
  • Process for the preparation of prefabricated stabilizers and process for preparing polymer polyols therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: 1000ml reactor is equipped with agitator, heating device, temperature control device and feeder. Put 50g of unsaturated macromer and 200g of isopropanol into the reactor, raise the temperature to 75°C~85°C, add 0.5g of dimethyl azobisisobutyrate, 25g of styrene, 25g of acrylonitrile, 199.5g of isopropanol Mix propanol evenly as the top material, and the top material is continuously added to the bottom material. The feeding time is 2 hours. After the feeding is completed, the heat preservation is absorbed for 2 hours, and 399.5g of polyoxyalkylene polyol is added, and the temperature is raised to 110℃~130℃ and the pressure is reduced. The volatile substances and unreacted monomers are removed by distillation, which is the prefabricated stabilizer A. Prefabricated stabilizer A contains 9.3 parts of vinyl polymer and 80 parts of polyoxyalkylene polyol. figure 1 Shown is the particle size distribution graph of Preformed Stabilizer A with an average particle s...

Embodiment 2

[0043] Embodiment 2: Two 250ml reactors are connected in series, equipped with stirrer, heating device, temperature control device and feeder. Put about 150g of product A into the two reactors as base materials, raise the temperature to 75°C to 85°C, add 300g of unsaturated macromonomers, 2.25g of azobisisobutyronitrile, 52.5g of brominated styrene, 22.5 g of acrylonitrile and 1122.75g of isopropanol are mixed evenly, continuously added to the base material, the feeding time is 3 hours, the overflow material is collected, and 1120g of polyoxyalkylene polyol is mixed with the overflow material, and the temperature is 110℃~130℃ Under reduced pressure distillation to remove volatile substances and unreacted monomers, it is the prefabricated stabilizer B. Preformed stabilizer B contained 5 parts of vinyl polymer and 74.3 parts of polyoxyalkylene polyol. figure 2 Shown is the particle size distribution graph of Preformed Stabilizer B with an average particle size of 105.7 nm.

Embodiment 3

[0044] Embodiment 3: 1000ml reactor is equipped with agitator, heating device, temperature control device and feeder. Put 150g of unsaturated macromer and 100g of isopropanol into the reactor, heat up to 75°C-85°C, mix 1g of azobisisobutyronitrile, 21g of vinyl chloride, 14g of acrylonitrile, and 214g of isopropanol evenly as The top material, the top material is continuously added to the bottom material, and the feeding time is 2.5 hours. After the feeding is completed, the insulation is absorbed for 1.5 hours, and 314g of polyoxyalkylene polyol is added, and the temperature is raised to 110 ° C ~ 130 ° C to remove volatile substances by vacuum distillation And the unreacted monomer is the prefabricated stabilizer C. Prefabricated stabilizer C contains 6.5 parts of vinyl polymer and 63 parts of polyoxyalkylene polyol. image 3 Shown is the particle size distribution graph of Preformed Stabilizer C with an average particle size of 113.6 nm.

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Abstract

The invention relates to a preformed stabilizer preparation method and a method for preparing polymer polyol by the preformed stabilizer. The preformed stabilizer comprises about 5-30 parts of a vinyl polymer and about 40-80 parts of polyoxypropylene polyol, and is used for preparing the polymer polyol with high solid content. The polymer polyol contains 40-50 parts of the vinyl polymer and about 35-55 parts of polyoxyalkylene polyol. The particle size distribution of the polymer polyol is wide, particles with the particle size being 20 nm-100 nm account for about 1-20% of total amount of the total solid particles; and particles with the particle size being 700-4000 nm account for about 0.1-20% of total amount of the total solid particles. The viscosity of the high solid content polymer polyol is low with 3000 mPa.s-10000 mPa.s (25 DEG C), and the method preferably selects the product with viscosity being 3000 mPa.s-7000 mPa.s (25 DEG C).

Description

technical field [0001] The invention relates to a method for preparing a prefabricated stabilizer and a method for preparing polymer polyols therefrom. 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 synthetic methods appeared. For example, vinyl polymers were synthesized separately and then diluted in polyols. In this way, the so-called "redispersible graft polyols" were prepared. However, the most common method r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F220/44C08F212/14C08F214/06C08F2/38C08F2/00C08G18/48C08G18/62
Inventor 郝敬颖李玉松朱姝
Owner CHINA PETROLEUM & CHEM CORP