Colored waterborne polyurethane and preparation method thereof

Abstract

The invention discloses colored waterborne polyurethane which is prepared from the following raw materials in parts by weight: 50-200 parts of diisocyanate, 150-350 parts of conventional dihydric alcohol, 50-120 parts of colored polyester polyol, 1-20 parts of micromolecule chain extender, 10-45 parts of hydrophilic chain extender and 400-1200 parts of deionized water. The colored polyester polyol is prepared from the following raw materials in parts by weight: 20-100 parts of binary acid, 30-110 parts of a micromolecular chain extender, 5-20 parts of dye containing active hydroxyl and 0.1-0.5 part of tetrabutyl titanate, wherein the mole number of hydroxyl to carboxyl is (1.1-1.3): 1. According to the colored waterborne polyurethane, the colored group is synthesized into a polyurethane molecular chain in situ through a chemical reaction, and the dye is combined with polyurethane through a chemical bond, so that the defects of color migration, low rubbing fastness and low water fastness are overcome; meanwhile, the dye and the polyurethane are in the same molecular structure and belong to a system, so that the stability is higher, and the flooding phenomenon is avoided. When being applied to the microfiber leather, the colored waterborne polyurethane has higher color fastness to washing, color fastness to rubbing and color migration resistance levels.

Description

technical field

[0001] The invention relates to the field of polymer synthesis, in particular to a colored water-based polyurethane and a preparation method thereof. Background technique

[0002] my country is the world's largest producer and exporter of textiles. The sustained and steady growth of textile exports is crucial to ensuring my country's foreign exchange reserves, balance of payments, stable RMB exchange rate, social employment and sustainable development of the textile industry. Especially in recent years, my country's PU synthetic leather has developed extremely rapidly. According to statistics, China's synthetic leather output in 2019 was 3.2828 million tons, a year-on-year increase of 9.6%.

[0003] Water-based polyurethane is widely used in textile printing and dyeing, leather processing and other fields due to its special molecular structure and aggregation state structure, which has good film-forming properties, excellent thermal and mechanical properties,...

Examples

preparation example Construction

[0038] A colored water-based polyurethane and its preparation method, comprising the following components, step 1: preparation of colored polyester polyol, prepared from the following raw materials in parts by weight: 20-100 parts of dibasic acid, 30 parts of small molecule chain extender -110 parts, 5-20 parts of dyes containing active hydroxyl groups, 0.1-0.5 parts of tetrabutyl titanate, wherein the molar ratio of hydroxyl and carboxyl groups is 1.1-1.3:1; Step 2: The preparation of colored water-based polyurethane consists of the following parts by weight Prepared from raw materials: 50-200 parts of diisocyanate, 150-350 parts of conventional diol, 50-120 parts of colored polyester diol, 1-20 parts of small molecule chain extender, 10-20 parts of hydrophilic chain extender 45 parts, 400-1200 parts of deionized water.

[0039] A kind of colored water-based polyurethane and its preparation method as described above, the said dibasic acid is any one of adipic acid, sebacic ac...

Embodiment 1

[0049] Step 1: Preparation of colored polyester polyol, (1) Weigh 100 parts of adipic acid, 51 parts of ethylene glycol, 10 parts of disperse yellow dye, and 0.4 part of tetrabutyl titanate into a four-necked flask During the process, the temperature was raised to 80°C, and the materials were stirred evenly by means of ultrasonic dispersion and stirring; (2) gradually raised to 240°C for 4 hours of reaction; (3) reduced to -0.09Mpa to distill out water and residual monomers, and detect The water content is less than 0.05%, the acid value is less than 1 mgKOH / g, and the hydroxyl value is 52-58 mgKOH / g, and the colored polyester polyol is obtained.

[0050] Step 2: Preparation of colored water-based polyurethane (1) 300 parts of polytetrahydrofuran ether diol (number average molecular weight is 2000), 100 parts of colored polyester polyol of step 1, and 25 parts of dimethylol propionic acid in a vacuum at 120°C Dehydrate for 1 hour, lower the temperature to 50°C, add 23 parts of...

Embodiment 2

[0052] Step 1: Preparation of colored polyester polyol, (1) 60 parts of adipic acid, 50 parts of sebacic acid, 71 parts of 1,4-butanediol, 13 parts of acid orange dye containing active hydroxyl groups, Weigh 0.3 part of tetrabutyl titanate into a four-necked flask, heat up to 80°C, and stir the material evenly by means of ultrasonic dispersion and stirring; (2) Gradually raise the temperature to 240°C for 4 hours; (3) reduce Water and residual monomers are distilled out under pressure, and the water content is less than 0.05%, the acid value is less than 1 mgKOH / g, and the hydroxyl value is 52-58 mgKOH / g, and the colored polyester polyol is obtained.

[0053] Step 2: the preparation of colored water-based polyurethane (1) with 205 parts of polytetrahydrofuran diols (number-average molecular weight is 1000), 100 parts of polypropylene glycol (number-average molecular weight is 2000), 80 parts of colored polyester polyols of step 1 and 30 parts 1 part of dimethylolpropionic acid...

technical field

[0001] The invention relates to the field of polymer synthesis, in particular to a colored water-based polyurethane and a preparation method thereof. Background technique

[0002] my country is the world's largest producer and exporter of textiles. The sustained and steady growth of textile exports is crucial to ensuring my country's foreign exchange reserves, balance of payments, stable RMB exchange rate, social employment and sustainable development of the textile industry. Especially in recent years, my country's PU synthetic leather has developed extremely rapidly. According to statistics, China's synthetic leather output in 2019 was 3.2828 million tons, a year-on-year increase of 9.6%.

[0003] Water-based polyurethane is widely used in textile printing and dyeing, leather processing and other fields due to its special molecular structure and aggregation state structure, which has good film-forming properties, excellent thermal and mechanical properties,...

Examples

preparation example Construction

[0038] A colored water-based polyurethane and its preparation method, comprising the following components, step 1: preparation of colored polyester polyol, prepared from the following raw materials in parts by weight: 20-100 parts of dibasic acid, 30 parts of small molecule chain extender -110 parts, 5-20 parts of dyes containing active hydroxyl groups, 0.1-0.5 parts of tetrabutyl titanate, wherein the molar ratio of hydroxyl and carboxyl groups is 1.1-1.3:1; Step 2: The preparation of colored water-based polyurethane consists of the following parts by weight Prepared from raw materials: 50-200 parts of diisocyanate, 150-350 parts of conventional diol, 50-120 parts of colored polyester diol, 1-20 parts of small molecule chain extender, 10-20 parts of hydrophilic chain extender 45 parts, 400-1200 parts of deionized water.

[0039] A kind of colored water-based polyurethane and its preparation method as described above, the said dibasic acid is any one of adipic acid, sebacic ac...

Embodiment 1

[0049] Step 1: Preparation of colored polyester polyol, (1) Weigh 100 parts of adipic acid, 51 parts of ethylene glycol, 10 parts of disperse yellow dye, and 0.4 part of tetrabutyl titanate into a four-necked flask During the process, the temperature was raised to 80°C, and the materials were stirred evenly by means of ultrasonic dispersion and stirring; (2) gradually raised to 240°C for 4 hours of reaction; (3) reduced to -0.09Mpa to distill out water and residual monomers, and detect The water content is less than 0.05%, the acid value is less than 1 mgKOH / g, and the hydroxyl value is 52-58 mgKOH / g, and the colored polyester polyol is obtained.

[0050] Step 2: Preparation of colored water-based polyurethane (1) 300 parts of polytetrahydrofuran ether diol (number average molecular weight is 2000), 100 parts of colored polyester polyol of step 1, and 25 parts of dimethylol propionic acid in a vacuum at 120°C Dehydrate for 1 hour, lower the temperature to 50°C, add 23 parts of...

Embodiment 2

[0052] Step 1: Preparation of colored polyester polyol, (1) 60 parts of adipic acid, 50 parts of sebacic acid, 71 parts of 1,4-butanediol, 13 parts of acid orange dye containing active hydroxyl groups, Weigh 0.3 part of tetrabutyl titanate into a four-necked flask, heat up to 80°C, and stir the material evenly by means of ultrasonic dispersion and stirring; (2) Gradually raise the temperature to 240°C for 4 hours; (3) reduce Water and residual monomers are distilled out under pressure, and the water content is less than 0.05%, the acid value is less than 1 mgKOH / g, and the hydroxyl value is 52-58 mgKOH / g, and the colored polyester polyol is obtained.

[0053] Step 2: the preparation of colored water-based polyurethane (1) with 205 parts of polytetrahydrofuran diols (number-average molecular weight is 1000), 100 parts of polypropylene glycol (number-average molecular weight is 2000), 80 parts of colored polyester polyols of step 1 and 30 parts 1 part of dimethylolpropionic acid...

Images