Polyurethane wood substitution composition

A technology of polyurethane and composition is applied in the field of manual preparation of the model products, which can solve the problems such as short operating time of pasty wood substitutes, and achieve the effects of good hardness and good mechanical properties.
CN103665313AInactive Publication Date: 2014-03-26COVESTRO DEUTSCHLAND AG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
COVESTRO DEUTSCHLAND AG
Publication Date
2014-03-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a polyurethane wood substitution composition which comprises: (a) one or more organic polyisocyanate(s); (b) one or more polyether polyol(s), wherein the degree of functionality of the polyether polyols is 2-6 and the hydroxyl value of the same is 100-700; the one or more polyether polyol(s) is / are homopolymerized and / or copolymerized products of an alkylene oxide compound and an amido-free polyhydric alcohol compound; (c) one or more aliphatic polyester polyol(s), wherein the hydroxyl value of the aliphatic polyester polyols is 100-500, and the degree of functionality of the same is 2-4; (d) optional one or more thixotropic agent (s); (e) optional one or more dehumidizer(s); (f) optional one or more microsphere(s), wherein the density of the microspheres is 20-500kg / m<3>. The polyurethane composition provided by the invention has long gelation time; the prepared polyurethane wood substitution has high hardness and high glass-transition temperature.
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Description

technical field

[0001] The present invention relates to a polyurethane substitute wood composition, and a molded article prepared from the polyurethane substitute wood composition, the molded article comprising polyurethane substitute wood with improved physical and process properties; the present invention also relates to the manual preparation of said molded article Methods. Background technique

[0002] Paste substitute wood is a paste resin material system, which usually uses polyester or epoxy resin to add fillers such as glass beads to form a paste. After the paste is mixed with a curing agent and cured, it has good Toughness, hardness, dimensional stability, temperature resistance, compressive strength, flexural strength and other physical properties, as well as good machinability, are often used in the manufacture of models, molds or gages. Polyurethane paste substitute wood is a paste material system formed by filling fillers with polyurethane resin.

[0003] Pate...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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