Special polyurethane resin for bright oily synthetic leather and preparation method of special polyurethane resin

Abstract

The invention relates to the technical field of leather finishing agent production, in particular to special polyurethane resin for bright oily synthetic leather and a preparation method of the special polyurethane resin. The polyurethane resin comprises components in percentage by weight as follows: 8%-20% of polyester polyol, 15%-20% of isocyanate, 2%-5% of micromolecular dihydric alcohol with the molecular weight lower than 150, 1%-5% of a chain extension modifier, 1%-5% of an acrylic acid end-capping reagent, 60%-69% of a solvent and 1%-3% of auxiliaries, wherein the auxiliaries comprise 0.1%-1% of an antioxidant, 0.05%-0.1% of a catalyst, 0.1%-1% of a high-temperature-resistant auxiliary and 0.1%-2% of a nano-powder auxiliary, and the sum of the antioxidant, the catalyst, the high-temperature-resistant auxiliary and the nano-powder auxiliary is in a range from 1% to 3%. The polyurethane resin is utilized to process a surface of a coating formed on the surface of the synthetic leather, oily gloss and brightness is strong, the hand feeling is dry and comfortable, and the problem that the polyurethane resin in the current market touches sticky especially when hands sweat in summer is solved.

Description

technical field

[0001] The invention relates to the technical field of leather treatment agent production, in particular to a special polyurethane resin for bright oil leather synthetic leather and a preparation method thereof. Background technique

[0002] At present, synthetic leather has largely replaced natural leather with insufficient resources to make bags, clothing, shoes, and decorations for vehicles and furniture. With the improvement of people's living standards and aesthetic tastes, synthetic leather products not only need to be durable, It should also have a good appearance and touch, which not only puts forward higher requirements for the polyurethane resin for the production of synthetic leather, but also puts forward higher requirements for the leather finishing agent. Synthetic leather is required to have a special visual effect and a strong sense of genuine leather; the polyurethane finishing agents currently on the market feel sticky to the touch due to sw...

Examples

Embodiment 1

[0032] A polyurethane resin specially used for bright oil leather synthetic leather, which is made of the following components in weight percentage: 10% polyester polyol, 17% isocyanate, 2% small molecule diol with a molecular weight below 150, and a chain extension modifier 4%, acrylic acid end-capping agent 1%, solvent 65%, antioxidant 0.1%, catalyst 0.05%, high temperature resistance additive 0.1%, nano powder additive 0.75%.

[0033] In this embodiment: the polyester polyol is polyethylene adipate-1,4-butylene glycol ester diol, and the number average mass is 700-1500 g / mol. It can be used in poly(1,3-butylene adipate diol), poly(1,4-butylene adipate) diol, poly(hexanediol adipate) diol (commercially available) according to the actual situation One or more mixtures of polyethylene adipate glycol-1,4-butylene glycol ester diol, and the number average mass is 700-1500g / mol.

[0034] In this embodiment: the small molecule diol with a molecular weight below 150 is 1,6-hexaned...

Embodiment 2

[0045] A kind of polyurethane resin specially used for bright oil leather synthetic leather, which is made of the following components in weight percentage: 8% polyester polyol, 20% isocyanate, 3.4% small molecule diol with molecular weight below 150, chain extension modifier 3%, acrylic acid end-capping agent 1.6%, solvent 62%, antioxidant 0.1%, catalyst 0.05%, high temperature resistance additive 0.3%, nano powder additive 1.55%.

[0046] In the formula of this embodiment, the polyester polyol is polyethylene adipate-1,4-butanediol and polyadipate-1,3-butanediol according to the weight of 1:1 The ratio of the composition of the mixture, the number average mass of the polyester polyol is 700-1500g / mol. Small molecule diols with a molecular weight below 150 are a mixture of 1,3-butanediol and 1,4-butanediol in a weight ratio of 1:1. The chain extension modifier is a mixture of castor oil and tung oil in a mass ratio of 3:1. The solvent is a mixture of N,N-dimethylformamide a...

Embodiment 3

[0055] A polyurethane resin specially used for bright oil leather synthetic leather, which is made of the following components in weight percentage: 15% polyester polyol, 15% isocyanate, 2% small molecule diol with a molecular weight below 150, and a chain extension modifier 4.2%, acrylic acid end-capping agent 1.5%, solvent 60%, antioxidant 0.1%, catalyst 0.05%, high temperature resistance additive 0.8%, nano powder additive 1.35%.

[0056] In the formula of this example, the dosages of 0.8% of high temperature resistant additive and 1.35% of nano powder additive are interchangeable, becoming 0.8% of high temperature resistant additive and 1.35% of wetting and dispersing additive.

[0057] In the formulation of this embodiment, the polyester polyol is polyhexamethylene adipate diol, and the number-average mass of the polyester polyol is 700-1500 g / mol. The small molecule diol with a molecular weight below 150 is 1,4-butanediol, the chain extension modifier is a mixture of cas...

technical field

[0001] The invention relates to the technical field of leather treatment agent production, in particular to a special polyurethane resin for bright oil leather synthetic leather and a preparation method thereof. Background technique

[0002] At present, synthetic leather has largely replaced natural leather with insufficient resources to make bags, clothing, shoes, and decorations for vehicles and furniture. With the improvement of people's living standards and aesthetic tastes, synthetic leather products not only need to be durable, It should also have a good appearance and touch, which not only puts forward higher requirements for the polyurethane resin for the production of synthetic leather, but also puts forward higher requirements for the leather finishing agent. Synthetic leather is required to have a special visual effect and a strong sense of genuine leather; the polyurethane finishing agents currently on the market feel sticky to the touch due to sw...

Examples

Embodiment 1

[0032] A polyurethane resin specially used for bright oil leather synthetic leather, which is made of the following components in weight percentage: 10% polyester polyol, 17% isocyanate, 2% small molecule diol with a molecular weight below 150, and a chain extension modifier 4%, acrylic acid end-capping agent 1%, solvent 65%, antioxidant 0.1%, catalyst 0.05%, high temperature resistance additive 0.1%, nano powder additive 0.75%.

[0033] In this embodiment: the polyester polyol is polyethylene adipate-1,4-butylene glycol ester diol, and the number average mass is 700-1500 g / mol. It can be used in poly(1,3-butylene adipate diol), poly(1,4-butylene adipate) diol, poly(hexanediol adipate) diol (commercially available) according to the actual situation One or more mixtures of polyethylene adipate glycol-1,4-butylene glycol ester diol, and the number average mass is 700-1500g / mol.

[0034] In this embodiment: the small molecule diol with a molecular weight below 150 is 1,6-hexaned...

Embodiment 2

[0045] A kind of polyurethane resin specially used for bright oil leather synthetic leather, which is made of the following components in weight percentage: 8% polyester polyol, 20% isocyanate, 3.4% small molecule diol with molecular weight below 150, chain extension modifier 3%, acrylic acid end-capping agent 1.6%, solvent 62%, antioxidant 0.1%, catalyst 0.05%, high temperature resistance additive 0.3%, nano powder additive 1.55%.

[0046] In the formula of this embodiment, the polyester polyol is polyethylene adipate-1,4-butanediol and polyadipate-1,3-butanediol according to the weight of 1:1 The ratio of the composition of the mixture, the number average mass of the polyester polyol is 700-1500g / mol. Small molecule diols with a molecular weight below 150 are a mixture of 1,3-butanediol and 1,4-butanediol in a weight ratio of 1:1. The chain extension modifier is a mixture of castor oil and tung oil in a mass ratio of 3:1. The solvent is a mixture of N,N-dimethylformamide a...

Embodiment 3

[0055] A polyurethane resin specially used for bright oil leather synthetic leather, which is made of the following components in weight percentage: 15% polyester polyol, 15% isocyanate, 2% small molecule diol with a molecular weight below 150, and a chain extension modifier 4.2%, acrylic acid end-capping agent 1.5%, solvent 60%, antioxidant 0.1%, catalyst 0.05%, high temperature resistance additive 0.8%, nano powder additive 1.35%.

[0056] In the formula of this example, the dosages of 0.8% of high temperature resistant additive and 1.35% of nano powder additive are interchangeable, becoming 0.8% of high temperature resistant additive and 1.35% of wetting and dispersing additive.

[0057] In the formulation of this embodiment, the polyester polyol is polyhexamethylene adipate diol, and the number-average mass of the polyester polyol is 700-1500 g / mol. The small molecule diol with a molecular weight below 150 is 1,4-butanediol, the chain extension modifier is a mixture of cas...