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Wet type polyurethane resin, production process and application method thereof

A wet-process polyurethane and production process technology, which is applied in the chemical industry, can solve problems such as poor crystallinity, poor structural regularity and strength, and weak hydrogen bonds, and achieve increased density, full hand feeling, improved hydrolysis resistance and peeling The effect of intensity

Active Publication Date: 2013-03-27
FUJIAN GUOBANG RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyether soft segment with low polarity is relatively poor in terms of structural regularity and strength.
Moreover, most polyether polyols contain side chains, which can produce steric hindrance effects, weaken the hydrogen bonds between PU molecular structures, and deteriorate crystallinity, which have a direct impact on the peel strength and tensile strength of the product.

Method used

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  • Wet type polyurethane resin, production process and application method thereof
  • Wet type polyurethane resin, production process and application method thereof
  • Wet type polyurethane resin, production process and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0040] Proceed as follows:

[0041]1. The so-called soft segment is synthesized into polyether polyol (PTMEG), poly(1,4-butylene adipate (BA) and polyethylene adipate (EA) in a molar ratio of 4:3:3 The mixture and diphenylmethane diisocyanate (MDI) are dissolved in the solvent N,N-dimethylformamide and then synthesized; the weight of the mixed polymer diol, diphenylmethane diisocyanate and solvent accounts for the total weight of the formula 33% by weight, the reaction stirring speed of the soft segment synthesis is 30 rpm, the temperature is controlled at 65° C., and the time is 2.5 hours.

[0042] 2. Add the product of the synthesis reaction to a solvent with 15% of the total weight of the formula to carry out the first prepolymer reaction. The reaction stirring speed of the first prepolymer reaction is 30 rpm, the reaction temperature is 65°C, and the reaction time is 2.5 hours , the reaction viscosity of the soft segment is 100,000.

[0043] 3. After the first prepolyme...

Embodiment 3

[0047] Proceed as follows:

[0048] 1. The so-called soft segment is synthesized into polyether polyol (PTMEG), poly(1,4-butylene adipate (BA) and polyethylene adipate (EA) in a molar ratio of 4:3:3 The mixture and diphenylmethane diisocyanate (MDI) are dissolved in the solvent N,N-dimethylformamide and then synthesized; the weight of the mixed polymer diol, diphenylmethane diisocyanate and solvent accounts for the total weight of the formula 35% by weight, the reaction stirring speed of soft segment synthesis is 30 rpm, the temperature is controlled at 70°C, and the time is 2.3 hours.

[0049] 2. Add the product of the synthesis reaction to a solvent with 15% of the total weight of the formula to carry out the first prepolymer reaction. The reaction stirring speed of the first prepolymer reaction is 30 rpm, the reaction temperature is 70°C, and the reaction time is 2.0 hours , the reaction viscosity of the soft segment is 120,000.

[0050] 3. After the first prepolymer rea...

Embodiment 4

[0055] It includes the following weight ratio: 100 parts of polyurethane (PU) resin, 12 parts of color paste, 0.7 parts of anionic surfactant (GB-11), 2 parts of nonionic surfactant (GB-7), and 45 parts of DMF.

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Abstract

The invention provides a wet type polyurethane resin, a production process and an application method thereof. The production process mainly comprises the following steps: 1, carrying out a soft-segment synthetic reaction on macromolecule dihydric alcohol and diphenyl methane diisocyanate; 2, enabling a first prepolymer to react; 3, adding a chain extender, and carrying out hard-segment synthetic reaction; and 4, adding an auxiliary. The wet type polyurethane resin manufactured by the production process is in form of yellowish transparent and thick viscous fluid, has viscosity of 180,000 to 220,000 (cps / 25 DEG C), modulus of 100% under 4.5 to 5.5 Mpa, elongation of not less than 550% and strippability of not less than 12.0kg / 3cm, the hydrolysis resistance is that 10% of NaOH is hydrated for 24 hours, and the wet type polyurethane resin has texture formation of 50 to 65%. The production process has the advantages that the texture formation, peeling strength and hydrolysis resistance of the wet type polyurethane resin are improved; the auxiliaries are selected before forming the leather, so that the density of the wet type polyurethane resin is improved, the finished artificial leather has washing durability and is high in strippability and full in touch.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a wet-process polyurethane resin and its production process and use method. Background technique [0002] At present, artificial leather is made by traditional technology, and the polyurethane resin produced by traditional technology is used to process the leather to obtain high peelability, good myogenicity and good hydrolysis resistance. [0003] The size of the leather cells is related to the viscosity of the prepolymer in the previous stage. The soft segment and the hard segment in the traditional process are a combined reaction. Various factors are not easy to control. The leather cells produced are small and poor in regularity, resulting in poor leather muscle formation. , the peel strength is not high. It is necessary to increase the number of scrapers and increase the amount of slurry used to achieve the relevant myogenicity, which increases the cost to a certain extent....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32C08G18/12D06N3/14B32B27/12B32B27/40
Inventor 李文国黄志红
Owner FUJIAN GUOBANG RESIN
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