阅读说明：本技术 一种水性聚氨酯树脂的制造工艺 (Process for manufacturing waterborne polyurethane resin ) 是由 施学义 于 2020-07-08 设计创作，主要内容包括：本发明涉及高分子聚合物技术领域,具体为一种水性聚氨酯树脂的制造工艺,S1、按重量份配比选取聚四亚甲基醚二醇与聚碳多元醇混合物、异佛尔酮二异氰酸酯、二氨基磺酸盐、催化剂、水、1,4-丁二醇、2,2-二羟甲基丙酸、溶剂；S2、对原料混合搅拌后进行加热；S3、在初步产物中添加乙二胺和异佛尔酮二胺中的一种,充分搅拌后进行第二阶段的加热反应；S4、对上述产物加水后进行加热乳化；S5、对上述产物在反应釜内进行保温处理；S6、对反应釜进行抽真空处理后冷却放料,以获得水性聚氨酯树脂；制造过程更加环保,降低对操作人员健康的危害,而且应用于合成革后,使得合成革革面光感自然,接近真皮的应有物性,防水性、透气性俱佳。(The invention relates to the technical field of high molecular polymers, in particular to a process for preparing waterborne polyurethane resin, S1, selecting a mixture of polytetramethylene ether glycol and polycarbopolyol, isophorone diisocyanate, diaminosulfonate, a catalyst, water, 1, 4-butanediol, 2-dimethylolpropionic acid and a solvent according to the weight part ratio; s2, mixing and stirring the raw materials, and heating; s3, adding one of ethylenediamine and isophoronediamine into the primary product, fully stirring, and then carrying out a second-stage heating reaction; s4, adding water into the product, and heating and emulsifying; s5, carrying out heat preservation treatment on the product in a reaction kettle; s6, carrying out vacuum pumping treatment on the reaction kettle, cooling and discharging to obtain the waterborne polyurethane resin; the manufacturing process is more environment-friendly, the harm to the health of operators is reduced, and after the synthetic leather is applied to the synthetic leather, the leather surface of the synthetic leather has natural light sensation, the physical property close to that of genuine leather, and the waterproof property and the air permeability are both good.)

1. A process for producing an aqueous polyurethane resin, which comprises the steps of:

s1, selecting raw materials;

selecting raw materials according to the following parts by weight, wherein the raw materials comprise 80-120 parts of a mixture of polytetramethylene ether glycol and polycarbopolyol, 100-120 parts of isophorone diisocyanate, 10-15 parts of diaminosulfonate, 3-5 parts of a catalyst, 200-300 parts of water, 15-20 parts of 1, 4-butanediol, 10-15 parts of 2, 2-dimethylolpropionic acid and 20-40 parts of a solvent;

s2, carrying out primary polymerization reaction on the raw material mixture;

firstly, mixing and stirring the raw materials selected in the step;

secondly, adding the stirred mixture into a reaction kettle for heating to obtain a primary product;

wherein the heating temperature is 70-90 ℃, and the heating duration is 3-6 h;

s3, carrying out second-stage polymerization reaction on the mixture;

firstly, adding one of ethylenediamine and isophoronediamine into the primary product obtained in the step;

secondly, fully stirring the mixture obtained in the step, and then carrying out heating reaction in a second stage to obtain a secondary product;

wherein the heating temperature is 70-80 ℃, and the heating duration is 1-1.5 h;

s4, adding water to emulsify the secondary product;

firstly, adding 300-400 parts by weight of water into a secondary product;

secondly, heating and emulsifying the secondary product after adding water to obtain a tertiary product;

wherein the heating temperature during emulsification is 70-80 ℃, and the heating duration is 1-1.5 h;

s5, carrying out heat preservation treatment on the tertiary product obtained in the step in a reaction kettle;

wherein the heat preservation temperature is 65-75 ℃;

s6, carrying out vacuum pumping treatment on the reaction kettle, cooling and discharging to obtain the waterborne polyurethane resin.

2. The process for producing an aqueous polyurethane resin according to claim 1, wherein: the mixture of polytetramethylene ether glycol and polycarbopolyol in step S1 comprises, by weight, 40-60 parts of polytetramethylene ether glycol and 40-60 parts of polycarbopolyol.

3. The process for producing an aqueous polyurethane resin according to claim 1, wherein: in the step S1, the water in the raw material is selected to be deionized water.

4. The process for producing an aqueous polyurethane resin according to claim 1, wherein: in the step S1, butanone is used as the solvent in the raw material.

5. The process for producing an aqueous polyurethane resin according to claim 1, wherein: and in the step S3, 5-20 parts by weight of ethylenediamine is added into the primary product.

6. The process for producing an aqueous polyurethane resin according to claim 1, wherein: and in the step S3, 5-20 parts by weight of isophorone diamine is added into the primary product.

7. The process for producing an aqueous polyurethane resin according to claim 1, wherein: the holding temperature in step S5 was 70 ℃.

8. The process for producing an aqueous polyurethane resin according to claim 1, wherein: and in the step S6, after vacuumizing, ensuring that the vacuum degree in the reaction kettle is 95-100 KPa.

9. The process for producing an aqueous polyurethane resin according to claim 8, wherein: and in the step S6, after vacuumizing, ensuring the vacuum degree in the reaction kettle to be 98 KPa.

10. The process for producing an aqueous polyurethane resin according to claim 1, wherein: and the temperature in the reaction kettle is 25-35 ℃ when the material is cooled and discharged in the step S6.

Technical Field

The invention relates to the technical field of high molecular polymers, in particular to a manufacturing process of waterborne polyurethane resin.

Background

Polyurethane is a short name for high polymer polyurethane containing a large number of urethane groups in the main chain. Because of the excellent physical and chemical properties, the polymer material is widely applied to the industries of synthetic leather and artificial leather, and is a multifunctional polymer material.

Traditionally, most of polyurethane resin for synthetic leather is oily, organic solvent is needed to be used as a diffusion medium for the polyurethane resin, toxic-NCO groups exist in the manufacturing process, and the polyurethane resin is easy to cause pollution to the environment and harm to the health of operators; in addition, finished leather using the oil-based polyurethane resin has the defects of unnatural light sensation, insufficient transparency and the like.

Disclosure of Invention

The invention aims to provide a manufacturing process of waterborne polyurethane resin, which is more environment-friendly in manufacturing process, reduces harm to health of operators, enables the leather surface of synthetic leather to have natural light sensation after being applied to the synthetic leather, is close to the due physical property of real leather, has good waterproofness and air permeability, and solves the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a manufacturing process of aqueous polyurethane resin comprises the following steps:

s1, selecting raw materials;

selecting raw materials according to the following parts by weight, wherein the raw materials comprise 80-120 parts of a mixture of polytetramethylene ether glycol and polycarbopolyol, 100-120 parts of isophorone diisocyanate, 10-15 parts of diaminosulfonate, 3-5 parts of a catalyst, 200-300 parts of water, 15-20 parts of 1, 4-butanediol, 10-15 parts of 2, 2-dimethylolpropionic acid and 20-40 parts of a solvent;

s2, carrying out primary polymerization reaction on the raw material mixture;

firstly, mixing and stirring the raw materials selected in the step;

secondly, adding the stirred mixture into a reaction kettle for heating to obtain a primary product;

wherein the heating temperature is 70-90 ℃, and the heating duration is 3-6 h;

s3, carrying out second-stage polymerization reaction on the mixture;

firstly, adding one of ethylenediamine and isophoronediamine into the primary product obtained in the step;

secondly, fully stirring the mixture obtained in the step, and then carrying out heating reaction in a second stage to obtain a secondary product;

wherein the heating temperature is 70-80 ℃, and the heating duration is 1-1.5 h;

s4, adding water to emulsify the secondary product;

firstly, adding 300-400 parts by weight of water into a secondary product;

secondly, heating and emulsifying the secondary product after adding water to obtain a tertiary product;

wherein the heating temperature during emulsification is 70-80 ℃, and the heating duration is 1-1.5 h;

s5, carrying out heat preservation treatment on the tertiary product obtained in the step in a reaction kettle;

wherein the heat preservation temperature is 65-75 ℃;

s6, carrying out vacuum pumping treatment on the reaction kettle, cooling and discharging to obtain the waterborne polyurethane resin.

Preferably, the mixture of polytetramethylene ether glycol and polycarbopolyol in step S1 comprises 40-60 parts by weight of polytetramethylene ether glycol and 40-60 parts by weight of polycarbopolyol.

Preferably, in the step S1, the water in the raw material is deionized water.

Preferably, the solvent in the raw material selected in step S1 is butanone.

Preferably, in the step S3, 5 to 20 parts by weight of ethylenediamine is added to the preliminary product.

Preferably, in the step S3, 5 to 20 parts by weight of isophorone diamine is added to the preliminary product.

Preferably, the holding temperature in the step S5 is 70 ℃.

Preferably, after the vacuum pumping in the step S6, the vacuum degree in the reaction kettle is ensured to be 95-100 KPa.

Preferably, after the step S6, the vacuum degree in the reaction kettle is ensured to be 98 KPa.

Preferably, the temperature in the reaction kettle when the material is cooled and discharged in the step S6 is 25-35 ℃.

Compared with the prior art, the invention has the beneficial effects that:

1. the production process of the waterborne polyurethane resin greatly reduces the generation of toxic groups, is more environment-friendly, and greatly reduces the harm to operators.

2. The waterborne polyurethane resin prepared by the process has strong universality, can be distinguished by light increasing and light extinction through compounding, and has simple components and convenient operation.

3. The waterborne polyurethane resin prepared by the process has high tearing strength and peeling strength, and has the functions of wear resistance, scratch resistance, air permeability, water resistance, aging resistance, weather resistance, alcohol resistance and the like.

4. The finished leather surface finished by the waterborne polyurethane resin coating manufactured by the process disclosed by the invention has natural light sensation, is close to the due physical properties of real leather, has good water resistance and air permeability, improves a certain added value of a product, and better replaces the physical properties which cannot be possessed by natural leather; the product is widely applied to PU leather and PVC leather, and simultaneously applied to base cloth, paper and the like, and has good effect.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.