Polyurethane resin used for sofa leather and preparation process thereof
A polyurethane resin and sofa leather technology, which is applied in the field of polyurethane resin, can solve the problems of poor control of particle dispersion, and achieve the effects of low cost, improved adaptability, and extended service life
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Embodiment 1
[0023] Present embodiment polycarbonate diol is prepared as follows:
[0024] First, put 10 parts of 1,4-butanediol and 150 parts of propylene carbonate monomer into the reactor, add 3.2 parts of antioxidant 1010 at the same time, and start stirring rapidly, when the temperature in the reactor rises to 220 ° C, add 0.128 parts Catalyst tetrabutyl titanate, during the reaction, take samples every hour to measure the viscosity of polyester polyol until the viscosity no longer changes, that is, to the end. The viscosity of the prepared polycarbonate diol is 450mpa·s / 75°C, the hydroxyl value is 75.0mgKOH / g, and the number average molecular weight is 1496.
Embodiment 2
[0026] Present embodiment polycarbonate diol is prepared as follows:
[0027] First, put 10 parts of 1,4-butanediol and 200 parts of propylene carbonate monomer into the reactor, add 4.2 parts of antioxidant 1010 at the same time, and start stirring rapidly, when the temperature in the reactor rises to 220 ° C, add 0.168 parts Catalyst tetrabutyl titanate, the viscosity of the polyester polyol is measured by sampling every hour during the reaction, until the viscosity does not change and it reaches the end point. The viscosity of the prepared polycarbonate diol is 530mpa·s / 75°C, the hydroxyl value is 56.5mgKOH / g, and does not change any more, and the number average molecular weight is 1985.
Embodiment 3
[0029] Present embodiment polycarbonate diol is prepared as follows:
[0030] First, put 10 parts of 1,4-butanediol and 250 parts of propylene carbonate monomer into the reactor, add 5.2 parts of antioxidant 1010 at the same time, and start stirring rapidly, when the temperature in the reactor rises to 220 ° C, add 0.208 parts Catalyst tetrabutyl titanate, the viscosity of the polyester polyol is measured by sampling every hour during the reaction, until the viscosity does not change and it reaches the end point. The viscosity of the prepared polycarbonate diol is 652mpa·s / 75°C, the hydroxyl value is 44.8mgKOH / g, and the number average molecular weight is 2504.
[0031] The preparation method for synthesizing the polyurethane resin for sofa leather of the present invention by using the polycarbonate diols in Examples 1, 2 and 3 is specifically illustrated by the following Examples 4-12. The polycarbonate diol used in Comparative Example 1 is PCDL-4672 produced by Asahi Kasei ...
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Abstract
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