Alcohol-solvent-resistant, wear-resistant and yellowing-resistant surface polyurethane resin and preparation method thereof

Abstract

The invention discloses alcohol-solvent-resistant, wear-resistant and yellowing-resistant surface polyurethane resin and a preparation method thereof. The surface polyurethane resin is prepared from raw materials by mass as follows: 5-10 parts of diisocyanate, 18-22 parts of polyether diol, 1-3 parts of a chain expander, 65-75 parts of an organic solvent, 0.2%-0.5% of a reaction terminator, 0.01%-0.05% of an antioxidant and 0.01%-0.05% of a catalyst. The surface polyurethane resin has the characteristics of alcohol wiping resistance, wear resistance and yellowing resistance after being used for producing synthetic leather.

Description

[0001] 1. Technical field

[0002] The invention relates to a functional polyurethane resin, in particular to an alcohol solvent-resistant, wear-resistant and yellowing-resistant surface layer polyurethane resin and a preparation method thereof.

[0003] 2. Background technology

[0004] With the development of synthetic leather technology in recent years, synthetic leather is very close to genuine leather in terms of style and feel, and even surpasses genuine leather in some aspects. It has largely replaced natural leather with insufficient resources to make bags, clothing, shoes, and vehicle interiors and furniture decorations. With the improvement of people's living standards and aesthetic taste, synthetic leather products must not only be durable, but also have good quality Excellent appearance and touch, which undoubtedly put forward higher requirements for polyurethane resins for synthetic leather.

[0005] The application of non-yellowing synthetic leather as a high-gra...

Examples

Embodiment 1

[0042] 1. Raw material and ratio:

[0043]

[0044] 2. Preparation

[0045] (1) earlier the PC-2 of 110kg, the PTMG-2 of 25kg, the EG of 1kg, 0.3kg antioxidant I-1010 and 0.1kg organic bismuth catalyst are joined in 60kg DMF, after stirring, add 45kg HMDI, be warming up to React at 95°C for 2 hours;

[0046] (2) Add an organic solvent with 75% of the total mass of the organic solvent to the reaction solution of step (1), drop the temperature of the reactor to 40-45° C., add the diamine HMDA dropwise, and continuously add the remaining amount of solvent in the process, Add 2kg of reaction terminator MEA until the viscosity reaches 60-80Pa·s / 25℃;

[0047] (3) The temperature of the reaction solution in step (2) was raised to 80° C. and stirred for 1.5 hours to obtain a polyurethane resin.

Embodiment 2

[0049] 1. Raw material and ratio:

[0050]

[0051] 2. Preparation

[0052] (1) earlier the PC-2 of 100kg, the PPG-2 of 25kg, the EG of 2kg, 0.3kg antioxidant I-1010 and 0.1kg organic bismuth catalyst are joined in 48kg DMF, after stirring, add 48kg HMDI, be warming up to React at 95°C for 2 hours;

[0053] (2) Add an organic solvent with 70% of the total mass of the organic solvent to the reaction solution in step (1), drop the temperature of the reactor to 35-40° C., add diamine IPDA dropwise, and continuously add a surplus of solvent in the process, Add 2kg of reaction terminator PPA until the viscosity reaches 80-120Pa·s / 25℃;

[0054] (3) The temperature of the reaction solution in step (2) was raised to 75° C. and stirred for 1 hour to obtain a polyurethane resin.

Embodiment 3

[0056] 1. Raw material and ratio:

[0057]

[0058]

[0059] 2. Preparation

[0060] (1) earlier the PC-1 of 80kg, the BG of the PTMG-2 of 55kg, 3kg, 0.3kg antioxidant I-1010 and 0.2kg organic bismuth catalyst are joined in 108kg DMF, after stirring, add 100kg HMDI, be warming up to React at 45-50°C for 1 hour;

[0061] (2) Add an organic solvent with a total mass of 75% of the organic solvent to the reaction solution in step (1), lower the temperature of the reactor to 40-45° C., add diamine HMDA dropwise, and continuously add the remaining solvent in the process until the viscosity is reached. After reaching 60~80Pa·s / 25℃, add 3kg of reaction terminator MEA;

[0062] (3) The temperature of the reaction solution in step (2) was raised to 85° C., and stirred for 1 hour to obtain a polyurethane resin.

[0001] 1. Technical field

[0002] The invention relates to a functional polyurethane resin, in particular to an alcohol solvent-resistant, wear-resistant and yellowing-resistant surface layer polyurethane resin and a preparation method thereof.

[0003] 2. Background technology

[0004] With the development of synthetic leather technology in recent years, synthetic leather is very close to genuine leather in terms of style and feel, and even surpasses genuine leather in some aspects. It has largely replaced natural leather with insufficient resources to make bags, clothing, shoes, and vehicle interiors and furniture decorations. With the improvement of people's living standards and aesthetic taste, synthetic leather products must not only be durable, but also have good quality Excellent appearance and touch, which undoubtedly put forward higher requirements for polyurethane resins for synthetic leather.

[0005] The application of non-yellowing synthetic leather as a high-gra...

Examples

Embodiment 1

[0042] 1. Raw material and ratio:

[0043]

[0044] 2. Preparation

[0045] (1) earlier the PC-2 of 110kg, the PTMG-2 of 25kg, the EG of 1kg, 0.3kg antioxidant I-1010 and 0.1kg organic bismuth catalyst are joined in 60kg DMF, after stirring, add 45kg HMDI, be warming up to React at 95°C for 2 hours;

[0046] (2) Add an organic solvent with 75% of the total mass of the organic solvent to the reaction solution of step (1), drop the temperature of the reactor to 40-45° C., add the diamine HMDA dropwise, and continuously add the remaining amount of solvent in the process, Add 2kg of reaction terminator MEA until the viscosity reaches 60-80Pa·s / 25℃;

[0047] (3) The temperature of the reaction solution in step (2) was raised to 80° C. and stirred for 1.5 hours to obtain a polyurethane resin.

Embodiment 2

[0049] 1. Raw material and ratio:

[0050]

[0051] 2. Preparation

[0052] (1) earlier the PC-2 of 100kg, the PPG-2 of 25kg, the EG of 2kg, 0.3kg antioxidant I-1010 and 0.1kg organic bismuth catalyst are joined in 48kg DMF, after stirring, add 48kg HMDI, be warming up to React at 95°C for 2 hours;

[0053] (2) Add an organic solvent with 70% of the total mass of the organic solvent to the reaction solution in step (1), drop the temperature of the reactor to 35-40° C., add diamine IPDA dropwise, and continuously add a surplus of solvent in the process, Add 2kg of reaction terminator PPA until the viscosity reaches 80-120Pa·s / 25℃;

[0054] (3) The temperature of the reaction solution in step (2) was raised to 75° C. and stirred for 1 hour to obtain a polyurethane resin.

Embodiment 3

[0056] 1. Raw material and ratio:

[0057]

[0058]

[0059] 2. Preparation

[0060] (1) earlier the PC-1 of 80kg, the BG of the PTMG-2 of 55kg, 3kg, 0.3kg antioxidant I-1010 and 0.2kg organic bismuth catalyst are joined in 108kg DMF, after stirring, add 100kg HMDI, be warming up to React at 45-50°C for 1 hour;

[0061] (2) Add an organic solvent with a total mass of 75% of the organic solvent to the reaction solution in step (1), lower the temperature of the reactor to 40-45° C., add diamine HMDA dropwise, and continuously add the remaining solvent in the process until the viscosity is reached. After reaching 60~80Pa·s / 25℃, add 3kg of reaction terminator MEA;

[0062] (3) The temperature of the reaction solution in step (2) was raised to 85° C., and stirred for 1 hour to obtain a polyurethane resin.

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