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Stabilizing Dispersant and Its Application in the Preparation of Copolymer Polyols

A technology of copolymer polyol and stable dispersant, which is applied in the field of copolymer polyol preparation, can solve the problems of low solid content of copolymer polyol, large amount of stable dispersant, high viscosity, etc., and achieves low viscosity, easy operation, Good stability and dispersion effect

Active Publication Date: 2021-06-29
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As disclosed in US3652639 and US3823201, a stable dispersant with specific reactive unsaturation is used to prepare copolymer polyols, but the prepared copolymer polyols have low solid content
Later patent US5196476, EP0786480 disclose the method for preparing POP by prefabricated stabilizer method, at first, free radical polymerization initiator and stabilizing dispersant and ethylenically unsaturated monomer reaction prepare prefabricated stabilizer, then, in the presence of polyether The prefabricated stabilizer continues to polymerize with ethylenically unsaturated monomers to prepare POP. This method has the disadvantages of using a large amount of stabilizing dispersant and high viscosity

Method used

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  • Stabilizing Dispersant and Its Application in the Preparation of Copolymer Polyols
  • Stabilizing Dispersant and Its Application in the Preparation of Copolymer Polyols
  • Stabilizing Dispersant and Its Application in the Preparation of Copolymer Polyols

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The preparation of stable dispersant 1 (reaction schematic diagram can refer to figure 2 ):

[0057] Mix 3000 g of polyether polyol A, 40.3 g of cyclobutane tetracarboxylic dianhydride, and 180 g of acetone evenly, raise the temperature to 100° C., and stir and reflux for 16 hours. Then, add 3.1g of ethyltriphenylphosphine iodide and stir to dissolve, then add 40.3g of glycidyl methacrylate (GMA) and 1.78g of hydroquinone, react overnight at 120°C, and the resulting product is transparent Light yellow liquid, viscosity is 2580mPa.s, degree of unsaturation is

[0058] 0.076meq / g, has a higher degree of unsaturation than the contrast stabilizer, indicating that it has more active sites.

Embodiment 2

[0060] The preparation of stable dispersant 2 (reaction schematic diagram can refer to figure 2 ):

[0061] Mix 3000 g of polyether polyol B and 41.9 g of pyromellitic dianhydride evenly, heat to 120° C., and react for 18 hours under nitrogen protection. Then add 3.0g of ethyltriphenylphosphine iodide (ETPPI) and stir to dissolve, then add 36.1g of glycidyl acrylate (GA) and 0.90g of hydroquinone, and react overnight at 120°C. The resulting product is a transparent light Yellow liquid with a viscosity of 1780mPa.s and a degree of unsaturation of 0.092meq / g, which has a higher degree of unsaturation than the comparison stabilizer, indicating that it has more active sites.

Embodiment 3

[0063] Copolymer polyol 1 preparation:

[0064] The 500ml four-necked bottle is equipped with a stirrer, a heating device, a temperature control device and a feeder as a reactor. Add 55.4g of basic polyether polyol (Wanhua 3156), 3.6g of stable dispersant 1, after nitrogen replacement, stirring and slowly raising the temperature to 110°C, and continuously adding topping materials (10.47g of isopropanol, 85.71g of basic polyether polyol 3156, a mixture of 46.55g of acrylonitrile, 69.83g of styrene, and 1.21g of azobisisobutyronitrile), and the temperature is controlled at 115°C to 120°C. The dropwise addition was completed within 100 minutes, the feeding was completed, the aging reaction was carried out for 1 hour, the temperature was raised to 160°C, and the unreacted monomer was removed in vacuum for 2 hours to obtain the product, and the product index was measured. Residual styrene / acrylonitrile / isopropanol are respectively 2 / 2 / 4ppm in sequence, hydroxyl value is 29.8mgK...

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Abstract

The invention provides a stable dispersant and its application in the preparation of a copolymer polyol. The preparation method of the stable dispersant comprises: 1) contacting and reacting a polyol with a dianhydride compound to obtain an adduct; 2) The adduct obtained in step 1) is subjected to a ring-opening addition reaction with an epoxy compound to obtain the stable dispersant; wherein, the dianhydride compound does not contain a double bond that can be copolymerized with an ethylenically unsaturated monomer, The epoxy compound contains double bonds that can be copolymerized with ethylenically unsaturated monomers; the polyol is polyester polyol and / or polyether polyol, preferably polyether polyol. The stable dispersant obtained by this preparation method has the anchoring function of multiple active sites, and it can be used in the synthesis of copolymer polyols to obtain copolymer polyols with a relatively single particle size.

Description

technical field [0001] The invention relates to the technical field of preparation of copolymer polyols, in particular to the synthesis of a novel stable dispersant and its application in copolymer polyols. Background technique [0002] Copolymer polyols, which are dispersions of polymers in polyols, are often used in the manufacture of polyurethane foam to improve load carrying and other properties. The commonly used types are vinyl polymer particle polyol (dispersion of styrene-acrylonitrile), polyurea particle dispersion (PHD polyol), polyisocyanate addition polymer (PIPA polyol, polyurethane-polyurea particle Dispersions). At present, the dispersion of styrene / acrylonitrile copolymer in polyol (referred to as copolymer polyol or polymer dispersion, abbreviated as POP) is widely commercialized. [0003] Its stability mostly relies on the stabilizing effect of the graft or addition product formed between the polymer of the unsaturated compound and the polyol molecule. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/332C08F220/44C08F283/06C08F212/08C08G18/63C08J9/08C08G101/00
CPCC08G65/3324C08G65/3322C08G18/632C08F283/06C08F220/44C08G2110/0083C08F212/08C08G65/332C08F212/10C08G18/4837C08G18/3275C08G18/302C08G18/244C08G18/18C08G2110/0008C08G65/2615C08G65/14C09J133/066C07C67/26C08G18/0876C08G18/14C08G2101/00
Inventor 李付国刘洋鞠昌迅刘斌秦承群吴训锟李晶郑兵王伦朋
Owner WANHUA CHEM GRP CO LTD
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