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Powder paint solidifying agent and method of manufacturing used long chain carbon polyanhydride

A technology of powder coating and curing agent, which is applied in the direction of powder coating, preparation of organic compounds, preparation of carboxylic anhydride, etc. It can solve the problems of long reaction time, high distillation temperature, yellow color of polyanhydride finished products, etc., and achieve yellowing resistance Highlighted, light-colored effects

Inactive Publication Date: 2008-01-23
CATHAY R&D CENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] The common problem in this process is that the distillation temperature in the later stage of the process is too high and the reaction time is too long, which directly leads to the yellow color of the final polyanhydride product.

Method used

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  • Powder paint solidifying agent and method of manufacturing used long chain carbon polyanhydride

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preparation example Construction

[0046] The preparation method of its long-carbon chain dibasic acid polyanhydride, the method includes a polymerization step and a purification step, wherein the polymerization step is to first produce a long-carbon chain dibasic acid through a biofermentation method of an alkane or fatty acid with a specific carbon chain length. The dibasic acid is purified to meet specific specification requirements, and then a suitable amount of long-carbon chain dibasic acid and other reactive substances are put into it, controlled according to the composition and molecular weight of the polyanhydride of the existing polyanhydride curing agent, The proportion of feeding materials is put into an atmospheric distillation kettle, heated to 100-140°C, and the low-molecular substances are evaporated at atmospheric pressure, and the distillation time is 1-6 hours; The finished product is obtained; or the polyanhydride product is obtained after distillation is carried out in a wiped film evaporati...

preparation example 1

[0068] In a 200M3 fermenter equipped with 100M3 medium, insert the seed solution to start fermentation. The composition of the fermentation medium is: 1.5% glucose, 1.5% KH2PO4, 1.0% yeast extract, 0.5% corn steep liquor, 0.35% urea, 0.1% NaCl, 30.7% KNO, natural pH, sterilized at 121°C. Dissociation of alkanes and feed sugars. Cultivate at 29°C under the conditions of ventilation rate 0.5vvm and tank pressure 1.0Mpa. 20 hours before fermentation, the pH is natural, and the growth is mainly based on bacterial growth. When the optical density (OD600) of bacterial growth is greater than 0.6, start to feed C11 alkane, control the concentration of C11 alkane in the fermentation broth to maintain at about 5%, and adjust the pH to 7.0 at the same time , Within 48 hours, adjust the pH to 7.0 with NaOH solution every 4 hours, 48-72 hours, adjust the pH to 7.5 with NaOH solution every 4 hours, 72-120 hours, adjust the pH to 7.8 with NaOH solution every 4 hours, 120 hours Until the ta...

preparation example 2

[0071]In a 200M3 fermenter equipped with 100M3 medium, insert the seed solution to start fermentation. The composition of the fermentation medium is: 3.0% glucose, 0.5% KH2PO4, 2% yeast extract, 1.5% corn steep liquor, 0.25% urea, 0.2% NaCl, 0.5% KNO3, prepared with tap water, natural pH, and sterilized at 121°C. Dissociation of C12 alkanes and fed sugars. Cultivate at 29°C under the conditions of ventilation rate 0.5vvm and tank pressure 1.0Mpa. 20 hours before fermentation, the pH is natural, and the growth is mainly based on bacterial growth. When the optical density (OD) of bacterial growth is greater than 0.6, start adding 8% of C12 alkanes in batch mode, and then add alkanes every 8 hours to control the concentration of alkanes in the fermentation broth Maintain at about 5%, adjust the pH to 6.5 at the same time, after 48 hours, adjust the pH to 7.0 with NaOH solution every 4 hours, adjust the pH to 7.5 with NaOH solution every 4 hours, 72-120 hours, every 4 hours Adju...

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Abstract

The invention discloses the long carbochain biatomic acid polyanhydrides curing agent with high quality using the alkane or the fatty acid as raw material and prepared by biological method. The biatomic acid polyanhydrides curing agent can be used for the curing of the powder coating. The invention also provides the preparation process of the long carbochain biatomic acid polyanhydrides curing agent. The process is started from the alkane or the fatty acid. First the biological fermentation method is applied to produce the long carbochain biatomic acid to gain the biatomic acid conforming to the requirements after special purification process. The biatomic acid carries out dehydration under normal pressure with other reactant under the material temperature of 100 DEG C. to 140 DEG C. and distillation time of 1h to 6h, and is decompressed and distilled to gain the finished product under the condition of the vacuum degree less than 15mmHg and temperature of 110 DEG C. to 140 DEG C., or is distilled in a wiped film vaporization device to remove the substance with small molecules to gain the polyanhydrides curing agent finished product. The long carbochain polyanhydrides curing agent gained by the invention has product color less than (Gardner chroma), ash not higher than 80ppm and nitrogen content not higher than 60ppm, melting point capable of being adjusted according to the requirement of the actual application, good resistance to yellow changing and completely meets the requirement of the high-grade powder coating on the curing agent.

Description

technical field [0001] The invention relates to the technical field of powder coating curing agents, and in particular provides a high-quality long-carbon chain dibasic acid polyanhydride curing agent product prepared by biotransformation and chemical polymerization using alkanes or fatty acids as starting materials. This product is a new curing agent for powder coatings. The present invention also provides a preparation process for the long carbon chain dibasic acid polyanhydride curing agent. The process starts from alkanes or fatty acids and produces long carbon chain dibasic acids by biological fermentation. After a special purification process, the catalyst Under the action of dehydration to generate polyanhydride. Background technique [0002] Thermosetting powder coatings are an environmentally friendly coating with very little or no solvent emissions. In Europe and the United States, due to the increasingly stringent requirements for voc (volatile organic compounds...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C09D5/03C07C55/02C07C51/00C12P7/44
CPCC12P7/6409C08G59/42C09D5/033C07C51/56C07C57/13C07C51/573
Inventor 秦兵兵张荣福衷金生
Owner CATHAY R&D CENT CO LTD
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