Environmentally-friendly storage-stable polyurethane composition for reaction injection molding and preparation method thereof

A technology of injection molding and composition, which is applied in the field of polyurethane, can solve the problems that the molding cycle is less than 1 minute, and the tin catalyst is difficult to meet the environmental protection index, and achieve the effect of short curing and demolding time, good compactness and good selectivity

Active Publication Date: 2012-02-01
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The molding cycle of the part is generally only a few minutes, and the rapid system molding cycle currently used in some fields is less than 1 minute
With the continuous improvement of environmental protection requirements, automobile manufacturers have higher and higher environmental protection requirements for materials, one of which is the restriction of heavy metal elements. Automobile manufacturers have formulated high requirements for detection limits of heavy metal elements. The European Union Resolution 2009 / 425 / EC has put forward a resolution to restrict tin-based catalysts, and it is difficult to meet the requirements of environmental protection indicators by using tin-based catalysts

Method used

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  • Environmentally-friendly storage-stable polyurethane composition for reaction injection molding and preparation method thereof

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preparation example Construction

[0032] Examples The preparation method of the delayed amine catalyst is as follows: mix 1 part of triethylenediamine with 2 parts of ethylene glycol or diethylene glycol, heat to 70-80 ° C and stir to dissolve, then add 20% by mass of salicylic acid , After heating at 80°C and stirring for 1 h, the delayed catalyst was obtained.

[0033] The concrete process of embodiment composition A, B component preparing PU-RIM material by RIM machine is as follows:

[0034] ①Feeding: according to the formula, premix component A of the composition evenly and add it to the storage tank of component A of the high-pressure injection machine, and then weigh a certain amount of component B of the composition and add it to the storage tank of component B;

[0035] ②Injection: Set the material temperature of component A to 20-40°C, component B at 20-40°C, and the injection pressure at 15±3MPa. After starting the injection, inject the reaction material, which has been preheated to 50-50°C, through...

Embodiment 1

[0039] Component A: 330N: 79.6 parts; 1,4-butanediol: 13.4 parts; carbon black: 2 parts; 2-(2'-hydroxy-5'-methylphenyl) benzotriazole: 3.6 parts ; Parts of bis(3,5-di-tert-butyl-4-hydroxyphenyl)sulfide: 1.2 parts; Bismuth neodecanoate: 0.09 parts; Delayed amine catalyst: 0.1 parts. Add each component into the reaction vessel, stir evenly and then discharge.

[0040]Component B: carbodiimide-modified diphenylmethane diisocyanate (NCO mass fraction 29%-30%): 90 parts; polyoxypropylene diol with a molecular weight of 2000: 10 parts. NCO mass fraction is 26.2%.

[0041] The reaction ratio of A and B is 100:58.5.

Embodiment 2

[0051] Component A: 330N: 77.35 parts; Ethylene glycol: 20.5 parts; Carbon black: 2 parts; Bismuth neodecanoate: 0.06 parts; Delayed amine catalyst: 0.08 parts. Add each component into the reaction vessel, stir evenly and then discharge.

[0052] Component B: uretonimine modified diphenylmethane diisocyanate (NCO mass fraction: 29-30%): 90 parts; polyoxypropylene diol with a molecular weight of 2000: 10 parts. NCO mass fraction is 26.4%.

[0053] A, B reaction ratio is 100:120.

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Abstract

The invention discloses an environmentally-friendly storage-stable polyurethane composition for reaction injection molding and a preparation method thereof. The polyurethane composition is composed of a component A and a component B, wherein the component A comprises 50-90% of polyether polyol, 1-40% of chain extender, 0-10% of pigment, 0-5% of anti-aging agent and 0.01-3% of composite catalyst; the component B comprises 60-95% of diisocyanate and 5-40% of polypropylene oxide glycol; the composite catalyst is composed of an organic bismuth or organic zirconium catalyst and a hindered amine catalyst; and the hindered amine catalyst is prepared by the following steps: mixing 1 part of triethylene diamine with 2 parts of ethylene glycol or diethylene glycol, heating to 70-80 DEG C, stirring and dissolving, adding 15-30wt% of salicylic acid, and stirring and reacting for 1 hour at the temperature of 80 DEG C. The composition is stable in storage and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of polyurethane, in particular to a polyurethane reaction injection molding (PU-RIM) material and its preparation. Background technique [0002] Polyurethane-Reaction Injection Molding (PU-RIM), referred to as PU-RIM, is a process technology for manufacturing complex parts directly from low-viscosity, high-reactivity raw materials through rapid reaction. Various raw materials collide and mix with each other at high speed before entering the cavity, and react in the cavity to form a solid polymer in the shape of the cavity, completing a molding cycle. The part molding cycle is generally only a few minutes, and the rapid system molding cycle currently used in some fields is less than 1 minute. The polyurethane reaction injection molding process is different from the low-pressure injection casting of polyurethane foam or elastomer, requiring less energy, rapid response, and short molding cycle; completely different from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/22C08G18/20B29C45/76
Inventor 董火成于文杰朱小树孙嘉鹏时国珍
Owner LIMING RES INST OF CHEM IND
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