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Sulfonic acid type solvent-free waterborne polyurethane resin and preparation method thereof

A water-based polyurethane, solvent-free technology, applied in the field of polyurethane, can solve the problems of increasing the cost of solvent recovery, limiting the scope of application, unfavorable environment and human health, etc., and achieves the effects of convenient operation and processing, no environmental pollution, and production cost saving.

Inactive Publication Date: 2021-07-16
明新梅诺卡(江苏)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the carboxylic acid type, the sulfonic acid type waterborne polyurethane particles are more uniformly dispersed, and the emulsion stability is good; the traditional carboxylic acid type waterborne polyurethane can only exist stably in an alkaline environment, which limits its application range, while the sulfonic acid type waterborne polyurethane can only exist stably in an alkaline environment, while the sulfonic acid type Water-based polyurethane can exist stably in both neutral and weakly acidic (PH=5-7) environments; compared with traditional carboxylic acid-based water-based polyurethane, sulfonic acid-based water-based polyurethane has better crystallinity, bonding strength, heat resistance, and water resistance. and mechanical properties have been improved to varying degrees
[0004] The water-based polyurethane preparation method prepared by the prior art and the prepared product have the following defects: 1. Some solvents, such as acetone, N-methylpyrrolidone, etc., are used in the production process, which are not only harmful to the environment and human health, but also Increased solvent recovery costs; 2. The mechanical properties and stability of traditional waterborne polyurethane still have a large room for modification

Method used

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  • Sulfonic acid type solvent-free waterborne polyurethane resin and preparation method thereof

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preparation example Construction

[0051] The preparation method of sulfonic acid type solvent-free waterborne polyurethane is as follows:

[0052] Step 1: Drying of polyether polyol

[0053] Weigh 100-200g of polyether polyol, 1-2g of antioxidant, 1-2g of light stabilizer in a four-necked flask equipped with a stirrer, thermometer, constant pressure funnel and vacuum pump, turn on the stirrer, vacuum pump, and pass through the automatic The temperature control system heats the material in the reactor to 100-120°C, adjusts the pressure to ≤-0.08MPa, vacuum distills for 1-2 hours, dehydrates the raw materials, and uses a trace moisture meter to measure the water content below 0.05%.

[0054] Step 2: Preparation of solvent-free waterborne polyurethane prepolymer

[0055] Lower the temperature of the polyol obtained in step (1) to below 80°C, then add 40 to 70 g of diisocyanate to the polyol from a constant pressure funnel, stir evenly, gradually raise the temperature to 80°C to 100°C, and react at a constant tem...

Embodiment 1

[0061] Step 1: Drying of polyether polyol

[0062] First, add 180g polytetrahydrofuran ether glycol (PTMG2000) and 1.44g antioxidant 1010, 1.68g light stabilizer 866 to a 500ml four-necked flask with electric stirring, thermometer, constant pressure funnel and vacuum pump, then turn on the electric stirring for stirring , Turn on the oil bath to heat up, turn on the positive air pump to vacuumize the four-necked flask, start timing when the thermometer on the four-necked flask reaches 110°C and the vacuum pressure is ≤-0.08MPa, keep the temperature at 100°C-120°C, Vacuum dehydration for 1.5h under the condition of pressure ≤ -0.08MPa.

[0063] Step 2: Preparation of solvent-free waterborne polyurethane prepolymer

[0064] When the water content in the polyol is less than 0.05%, turn off the vacuum pump and reduce the temperature of the oil bath. When the temperature of the thermometer drops to 80°C, slowly add 53.02g of isophorone diisocyanate (IPDI) through a constant pressu...

Embodiment 2

[0070] Step 1: Drying of polyether polyol

[0071] Add 146.20g polypropylene glycol (PPG2000) and 25.8g polycarbonate diol (UH-200), 3.56g polyethylene glycol monomethyl ether (N120) and 1.43g antioxidant 1010, 1.66g light stabilizer 866 to 500ml A four-necked flask with an electric stirrer, a thermometer, a constant pressure funnel and a vacuum pump, then turn on the electric stirrer to stir, turn on the oil bath to heat up, turn on the positive vacuum pump to vacuum the inside of the four-necked flask, when the thermometer on the four-necked flask When the temperature reaches 110°C and the vacuum pressure is ≤-0.08MPa, start timing, and keep the temperature between 100°C and 120°C and the pressure is ≤-0.08MPa for vacuum dehydration for 1 hour.

[0072] Step 2: Preparation of solvent-free waterborne polyurethane prepolymer

[0073] When the water content in the polyol is less than 0.05%, turn off the vacuum pump and reduce the temperature of the oil bath. When the temperatu...

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Abstract

The invention discloses sulfonic acid type solvent-free waterborne polyurethane resin and a preparation method thereof. The sulfonic acid type solvent-free waterborne polyurethane resin comprises the following components in parts by weight: 100-200 parts of polyol, 1-2 parts of an antioxidant, 1-2 parts of a light stabilizer, 0-3 parts of a chain extender, 0.5-3 parts of a cross-linking agent, 4-10 parts of a hydrophilic chain extender, 40-70 parts of diisocyanate, 300-600 parts of deionized water, 1-5 parts of a sulfonic acid type hydrophilic chain extender and 5-50 parts of a 20% post chain extender, so that the sulfonic acid type solvent-free waterborne polyurethane with the solid content of 30-50% can be obtained. The prepared sulfonic acid type solvent-free waterborne polyurethane resin does not contain any organic solvent, and has excellent properties in the aspects of alkali resistance, temperature resistance, stability, elongation at break and breaking strength.

Description

technical field [0001] The invention relates to the technical field of polyurethane, in particular to a sulfonic acid type solvent-free waterborne polyurethane resin and a preparation method thereof. Background technique [0002] Water-based polyurethane has developed rapidly as a material for microfiber synthetic leather. Microfiber synthetic leather is based on a non-woven fabric made of ultra-fine fibers with a sea-island structure. series of treatments to make a synthetic material that resembles natural leather. At present, most polyurethanes on the market are solvent-based resins prepared from toluene, xylene, acetone, methyl ethyl ketone, ethyl acetate, etc., because solvent-based polyurethanes contain a large amount of volatile organic solvents (VOC), in use During the process, it will be discharged into the atmosphere, which not only damages the environment and endangers health, but also wastes resources and energy. [0003] Since the first appearance of water-base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/12C08G18/32C08G18/34C08G18/40C08G18/44C08G18/48C08G18/66
CPCC08G18/10C08G18/12C08G18/6692C08G18/4854C08G18/4018C08G18/4825C08G18/44C08G18/3206C08G18/348
Inventor 庄君新刘婵婵宋兵
Owner 明新梅诺卡(江苏)新材料有限公司
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