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Quickly-demoulded weatherproof composition for polyurethane-reaction injection molding and preparation method thereof

A mold weather-resistant, injection molding technology, applied in the field of polyurethane, can solve the problem of poor light aging resistance of aromatic isocyanate, achieve the effect of high appearance gloss, superior light aging resistance, and shorten demoulding time

Active Publication Date: 2015-03-11
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention uses aromatic system modified isocyanate to achieve high performance and fast release, but the light aging resistance of aromatic isocyanate is poor

Method used

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  • Quickly-demoulded weatherproof composition for polyurethane-reaction injection molding and preparation method thereof
  • Quickly-demoulded weatherproof composition for polyurethane-reaction injection molding and preparation method thereof
  • Quickly-demoulded weatherproof composition for polyurethane-reaction injection molding and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0038] Examples Preparation of composite catalyst: Add 1 part of dibutyltin dilaurate, 5 parts of dimethyltin dilaurate and 2 parts of acetone into the container, stir and mix evenly at room temperature, then add 2 parts of bismuth octoate and stir Mix evenly, and then add 15 parts of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole to obtain a composite catalyst.

[0039] Component B: isocyanate and modifier, heat up to 90°C with stirring, react for 3 hours, cool to room temperature and discharge.

[0040] The process of embodiment composition A, B component preparing PU-RIM material by RIM machine is as follows:

[0041] ①Feeding: According to the formula, pre-mix 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;

[0042] ②Injection: Set the material temperature of component A...

Embodiment 1

[0047] A component: 330N: 73 parts, ethylene glycol: 10 parts, trimethylolpropane: 10 parts, carbon black: 0.5 parts, 2-(2'-hydroxy-5'-methylphenyl)benzotri Azole: 0.6 parts; bis(3,5-tertiary butyl-4-hydroxyphenyl) sulfide: 0.4 parts; composite catalyst: 1.5 parts.

[0048] Component B: hydrogenated MDI: 80.1 parts, trimethylolpropane: 1.8 parts, polybutylene adipate (molecular weight: 3000): 18.1 parts. NCO mass fraction is 23.5%. Viscosity at 25°C is 800mPa.s.

Embodiment 2

[0056] A component: 330N: 71.2 parts, ethylene glycol: 18 parts, trimethylolpropane: 3 parts, carbon black: 2 parts, 2-(2'-hydroxy-3,5'-di-tert-butylphenyl )-5-chlorobenzotriazole: 2 parts; bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate: 1 part; composite catalyst: 2.8 parts .

[0057] Component B: hydrogenated MDI: 90.1 parts, trimethylolpropane: 2.4 parts, polytetrahydrofuran diol (molecular weight: 1000): 7.5 parts. NCO mass fraction is 26.0%. Viscosity at 25°C is 500mPa.s.

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Abstract

The invention discloses a quickly-demoulded composition weatherproof composition for polyurethane-reaction injection molding and a preparation method thereof. The composition comprises a component A and a component B, wherein the component A is feed liquid containing an active -OH component, a variety of substances taking the active -OH as a functional group, and a specific catalyst, and if necessary, the component A can also contain an appropriate amount of auxiliary agents including a pigment, an antioxidant, an ultraviolet absorbent, an inner demoulding agent and the like; and the component B is feed liquid containing an active -NCO radical, and consists of 4,4'-dicyclohexyl methane diisocyanate and a modifier. The composition is used for producing a polyurethane product according to an RIM (reaction injection molding) process, wherein the gel time is 8-20 seconds, and the demoulding time is 45-600 seconds; and the storage period of the composition is more than 6 months.

Description

technical field [0001] The invention relates to the field of polyurethane, in particular to a polyurethane reaction injection molding (PU-RIM) material and process. 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 polyurethane reaction injection molding process is different from the cast polyurethane elastomer, requiring less energy, rapid response, and short molding cycle. Completely different from the traditional principle of thermoplastic resin injection molding, RIM polymerizes in the mold cavity instead of forming a solid polymer by cooling. PU-RIM material has good physical and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/24C08G18/22C08G18/20C08L75/08
Inventor 孙嘉鹏董火成朱小树李宁于文杰
Owner LIMING RES INST OF CHEM IND
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