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Water expansive polyurethane formed product and producing method thereof

A technology for water-swellable and molded products, which is applied in the field of water-expandable polyurethane molded products and their manufacturing, and can solve problems such as damage to sealing materials

Inactive Publication Date: 2005-07-13
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the sealing material whose water expansion ratio is more than 2 times, if the material that has been sealed after water expansion is moved mechanically, or the material is displaced due to external impact, the sealing material will not be displaced accordingly. breakage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0092] of polyurethane resin (1) to softener (1) was kneaded for 10 minutes in the composition (parts) of Table 2 in a Banbury mixer. Next, of the vulcanizing agent (B-1) to the foaming aid (1) was added, and kneaded for 30 minutes using two rolls. The complex was formed into a ribbon using an extrusion molding machine, and heated in an oven at 160° C. for 10 minutes to obtain a molded product. The protruding cross-sectional shape of the compound provided by the extrusion molding machine after extrusion was a rectangle of 2×30 mm after the heating was completed.

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Abstract

A water-swellable polyurethane molded product obtained by heating and curing a kneaded product consisting of a polyurethane resin (A) and a vulcanizing agent (B), wherein (A) is a compound (a) represented by the following general formula (1) ), polyoxyalkylene polyol (b1) containing at least 20% by mass of ethylene oxide units, polyoxyalkylene polyol (b2) composed of one or more alkylene oxide units having 3 to 4 carbon atoms, organic polyisocyanates (c) and a polyurethane resin with at least one ethylenically unsaturated bond on the side chain obtained by adding the low-molecular active hydrogen-containing compound (d) as required; and the saturated volume water expansion ratio is 1.2 to 8 times. The present invention also relates to a method for its manufacture. (HO)mR(OX)r-m(1) In the formula, R is an r-valent polyol residue, X is a group having one or more ethylenically unsaturated bonds, r is an integer of 3 or more, and m is 2 or more and r-m is an integer of 1 or more.

Description

technical field [0001] The present invention relates to a water-swellable polyurethane molded product and a method for producing the same. More specifically, it relates to a water-swellable polyurethane molded product suitable for water-cutting materials in civil engineering, construction, and other various fields, and a method for producing the same. Background technique [0002] In recent years, as water-expandable polyurethane molded articles, water-expandable polyurethane molded articles obtained by extrusion molding or pressure molding can be exemplified, and molded articles for water-expandable sealing materials with good performance have been proposed (Japanese Patent Laid-Open 2002-194101 Bulletin). [0003] However, the sealing material using the molded article described in Patent Document 1 showed sufficient values ​​for the tensile strength and elongation before water swelling, but the elongation after water absorption was not. insufficient. Especially when the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/62C08J3/24C08L75/14
Inventor 粟原昌纪三浦公生
Owner SANYO CHEM IND LTD
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