Solvent-free polyurethane resin used for sofa leather middle foaming layer and preparation method thereof

A solvent-free polyurethane and foam layer technology, applied in the field of functional polyurethane synthetic leather, can solve the problems of low mechanical strength of polyurethane resin, low peel strength of synthetic leather, large difference between polarity and surface layer, etc., and achieve soft and plump hand feeling , excellent mechanical strength, and good porosity

Inactive Publication Date: 2018-01-19
HEFEI ANLI POLYURETHANE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical strength of the polyether system polyurethane resin is low, and the peel strength of the obtained synthetic leather is not high, and the difference between the polarity and the surface layer is large, resulting in weak interfacial bonding.

Method used

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  • Solvent-free polyurethane resin used for sofa leather middle foaming layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Preparation of polyether polyester copolymer oligomer diol

[0056] Equipped with magnetic stirrer, thermometer, N 2 The four-necked flask of the inlet pipe and the air-cooling condensing pipe is installed in a jacketed resistance heater, and 285 mass parts of polypropylene oxide glycol (PPG, molecular weight 400), 190 mass parts of 1, 4-butanediol, 325 parts by mass of adipic acid, nitrogen gas for 30 minutes to remove the air in the system. Under the protection of nitrogen, gradually heat up to about 140°C to start the dehydration polycondensation reaction, and control the temperature at the top of the condensation tube to be lower than 100°C during the heating process. When the detected acid value is less than or equal to 30 mgKOH / g, add 0.3 parts by mass of tetraisopropyl titanate to react for 30 minutes, and gradually heat up to 240°C. Keep the system at 240°C, vacuum degree ≥0.095MPa, continue the reaction for 3 hours, then lower the temperature to separate ...

Embodiment 2

[0070] (1) Preparation of polyether polyester copolymer oligomer diol

[0071] Equipped with magnetic stirrer, thermometer, N 2 The four-necked flask of the inlet pipe and the air-cooling condensing pipe is installed in a jacketed resistance heater, and 300 mass parts of polypropylene oxide glycol (PPG, molecular weight 1000), 200 mass parts of 1, 4-butanediol, 300 parts by mass of adipic acid, and nitrogen gas for 30 minutes to remove the air in the system. Under the protection of nitrogen, gradually heat up to about 140°C to start the dehydration polycondensation reaction, and control the temperature at the top of the condensation tube to be lower than 100°C during the heating process. When the detected acid value is less than or equal to 30 mgKOH / g, add 0.3 parts by mass of tetraisopropyl titanate to react for 30 minutes, and gradually heat up to 240°C. Keep the system at 240°C, vacuum degree ≥ 0.095MPa, continue the reaction for 3 hours, then cool down to separate the pr...

Embodiment 3

[0085] (1) Preparation of polyether polyester copolymer oligomer diol

[0086] Equipped with magnetic stirrer, thermometer, N 2 The four-necked flask of the inlet pipe and the air-cooling condensing pipe was installed in the jacketed resistance heater, and 243 mass parts of polypropylene oxide glycol (PPG, molecular weight 400), 243 mass parts of 3 -Methyl-1,5-pentanediol, 315 parts by mass of adipic acid, nitrogen gas for 30 minutes to remove the air in the system. Under the protection of nitrogen, gradually heat up to about 140°C to start the dehydration polycondensation reaction, and control the temperature at the top of the condensation tube to be lower than 100°C during the heating process. When the detected acid value is less than or equal to 30 mgKOH / g, add 0.3 parts by mass of tetraisopropyl titanate to react for 30 minutes, and gradually heat up to 240°C. Keep the system at 240°C, vacuum degree ≥ 0.095MPa, continue the reaction for 3 hours, then cool down and separa...

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Abstract

The invention discloses solvent-free polyurethane resin used for a sofa leather middle foaming layer and a preparation method thereof. The solvent-free polyurethane resin is formed by mixing componentA and component B according to the mass ratio of (1: 2) to (2: 1). The solvent-free polyurethane resin prepared in the invention does not contain any solvent, synthetic leather prepared as a middle layer is green, environmentally-friendly, soft and plump in hand feel, the physical performance can reach one hundred thousand times of bending at normal temperature without cracking, eighty thousand times of bending at the cold-resistant temperature of -10 DEG C without cracking, the peeling strength is more than 50 N / 3cm, and the retention rate of the peeling strength for 5 to 7 weeks under the constant temperature and humidity conditions of 70 DEG C and 95% humidity can reach 75%.

Description

technical field [0001] The invention belongs to the field of functional polyurethane synthetic leather, and in particular relates to a solvent-free polyurethane resin for a middle foam layer of sofa leather with soft and plump hand feeling and a preparation method thereof. Background technique [0002] As a new multifunctional polymer material, polyurethane occupies an important position in the material industry, and has now developed into one of the world's six major synthetic materials. Among them, solvent-based polyurethane is widely used in the field of synthetic leather and gradually replaces PVC artificial leather. The wet process uses the solvent in the polyurethane resin to replace it with water. Because the polyurethane resin is insoluble in water and cannot form a homogeneous phase, it is condensed and formed; in addition, after the solvent is replaced by water Drying forms a loose and porous structure, which makes the hand feel soft and plump, which is closer to g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32C08G63/672C08G101/00
Inventor 李晓飞王海峰孔为青范仁祥姚克俭
Owner HEFEI ANLI POLYURETHANE NEW MATERIAL
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