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 demoulding time, good compactness and good selectivity

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 demoulding time, good compactness and good selectivity

CN102336882BActive Publication Date: 2013-04-10LIMING RES INST OF CHEM IND
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  • Environmentally-friendly storage-stable polyurethane composition for reaction injection molding and preparation method thereof

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[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

Patent Timeline
10 Apr 2013
Publication
CN102336882B
IPC
C08G18/66; C08G18/48; C08G18/22; C08G18/20; B29C45/76
Inventors
董火成; 于文杰