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Preparation method of polyester polyol of modified isocyanate, preparation method of isocyanate prepolymer and preparation method of polyurethane elastomer

A technology of isocyanate prepolymerization and polyester polyol, which is applied in the field of isocyanate modified polyester polyol preparation, isocyanate prepolymer preparation and polyurethane elastomer preparation, which can solve the problems of increased material cost, inconvenient processing, high melting point, etc.

Active Publication Date: 2011-06-15
ZHEJIANG HUAFON NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, adding an appropriate amount of hydrolysis-resistant agent to polyester polyol can make up for the disadvantage of poor hydrolysis resistance of polyester polyol-type polyurethane materials to a certain extent, but it also greatly increases the cost of materials.
On the other hand, there are also people who use some relatively long molecular chain diols and / or acid components to synthesize polyester polyols, but such synthetic polyester polyols generally have a high melting point, which brings inconvenience to processing

Method used

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  • Preparation method of polyester polyol of modified isocyanate, preparation method of isocyanate prepolymer and preparation method of polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Commercially available dry polyethylene adipate / diethylene glycol a1 has a hydroxyl value of 75 mgKOH / g, and the molar ratio of ethylene glycol to diethylene glycol is 1:1 for comparison.

Embodiment 2

[0015] Commercially available dry polyethylene adipate / diethylene glycol a2 has a hydroxyl value of 200 mgKOH / g, and the mass ratio of ethylene glycol to diethylene glycol is 1:1 for comparison.

[0016] Embodiment 1 of the present invention

[0017] Weigh polyester polyol a1 and carbodiimide-modified MDI in a molar ratio of 2.1:1, place in a reaction kettle, react at 60-80°C for 2-3 hours under the protection of nitrogen, and discharge to obtain Isocyanate-modified polyester polyol a3. Among them, the carbodiimide-modified MDI is provided by Dow Chemical Company, the brand is Isonate 143L, 2~2.2 functionalities, and the NCO mass fraction is 28%~30%, which is used to improve the hydrolysis resistance and storage stability of MDI .

[0018] Embodiment 2 of the present invention

[0019] Weigh polyester polyol a2 and carbodiimide-modified MDI at a molar ratio of 2.2:1, place in a reaction kettle, react at 60-80°C for 2-3 hours under the protection of nitrogen, and discharge t...

Embodiment 3

[0035]Prepare the POL components and weigh them respectively: polyester polyol is a3 100 kg, chain extender ethylene glycol 8 kg, catalyst Dabco EG 1.6 kg (U.S., produced by Air Products, commercially available), foam stabilizer DC193 (U.S. , produced by Air Products, commercially available) 0.25 kg and foaming agent water 0.45 kg. Put the weighed raw materials in a reaction kettle at 20-50°C, mix them well for 2-4 hours, discharge them, and keep them sealed. The temperature of the POL component and the ISO (prepolymer b2) component was adjusted so that the temperature of the POL component was 38-40°C, and the temperature of the ISO component was 41-43°C. Using a low-pressure foaming machine, according to the ratio of isocyanate index to 100%, quickly mix the POL component and ISO component in the mixing chamber at a speed of 6000 rpm, and pour it into a mold with a mold temperature of 45°C. Molding, keeping the pressure for 5 minutes, demoulding, and then curing at 75°C for ...

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Abstract

The invention belongs to a preparation method of polyester polyol of modified isocyanate, a preparation method of isocyanate prepolymer and a preparation method of polyurethane elastomer. The preparation method of the polyester polyol of the modified isocyanate comprises the following step of: reacting component A and component B at the temperature of between 60 and 80 DEG C under the protection of nitrogen, wherein the component A is one or more of polyester polyols which have 2 to 3 functionality degrees and the hydroxyl value which is between 50 and 500mgKOH / g; and the component B is modified isocyanate. The preparation method of the isocyanate prepolymer comprises the following step of: reacting the polyester polyol of the modified isocyanate and one or more of organic diisocyanates at the temperature of between 60 and 80 DEG C under the protection of nitrogen. The preparation method of the polyurethane microporous elastomer comprises the following step of: blending the modified isocyanate-containing polyester polyol, the isocyanate prepolymer and one or more of compounds selected from a chain extender, a catalyst, a foaming agent and a mixture of the chain extender, the catalyst and the foaming agent at the speed of between 5,000 and 7,000 revolutions per minute, wherein the index of the isocyanate is 100 percent.

Description

technical field [0001] The invention belongs to a method for preparing isocyanate-modified polyester polyol, a method for preparing isocyanate prepolymer, and a method for preparing polyurethane elastomer. Background technique [0002] Polyurethane microcellular elastomers belong to a very important category of polyurethane materials. In recent years, due to the continuous advancement of two-component liquid infusion molding (RIM) technology, the development of polyurethane microcellular elastomer industry has been actively and effectively promoted. Because of this special processing technology, polyurethane microcellular elastomer is very suitable for the processing of profiled materials, so it has been widely used in many fields such as shoe sole materials, automotive interior parts, cushioning materials, and load bearing tires. Polyurethane microcellular elastomers are formed by the reaction of polyol components and polyisocyanate components with the assistance of cataly...

Claims

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Application Information

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IPC IPC(8): C08G63/91C08G18/42C08G18/10
Inventor 朱彦温文宪郝智平刘旭赵叶宝章海飞
Owner ZHEJIANG HUAFON NEW MATERIALS CO LTD
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