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.

Inactive Publication Date: 2014-03-26
COVESTRO DEUTSCHLAND AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, the use of amino polyols and chemical thixotropes in this formulation results in a

Method used

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  • Polyurethane wood substitution composition
  • Polyurethane wood substitution composition

Examples

Experimental program
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Example Embodiment

[0111] Example 1-6

Example Embodiment

[0112] Example 1: Implement the following steps. Prepare 1000 g of materials according to the weight percentage shown in Table 1, and mix them by hand. All operations (weighing and mixing) are carried out at room temperature in a fume hood (temperature 20-25°C, relative humidity 45% to 55%).

[0113] 300g of the mixed material was horizontally coated on a vertical surface of a foam as a substrate, with thicknesses of 20mm, 30mm, 40mm and 50mm, respectively, to evaluate its anti-sagging performance.

[0114] Apply 500g of the mixed material to a foam substrate with a thickness of 30mm. After curing for 12 hours at room temperature, it is processed to a designed shape with a CNC machine tool, and the surface quality is observed with an electronic magnifying glass.

[0115] The remaining 200g of material is used to test Shore D hardness and density. The test standards are ISO868: 2003 and ISO2781: 1996 respectively.

[0116] The operation method of Example 2-6 is the same as that of Exa...

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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.

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

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Application Information

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IPC IPC(8): C08G18/76C08G18/75C08G18/73C08G18/78C08G18/48C08G18/42C08K3/36C08K7/28B32B27/40
CPCC08G18/36C08G18/0885C08G18/3206C08G18/3215C08G18/6662C08G18/6696C08G18/7664B32B27/40B32B2375/00C08G18/4018C08G18/6629C08K3/36C08K7/28
Inventor 成源顾永明郑伊辰
Owner COVESTRO DEUTSCHLAND AG
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