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foundation waterproof structure

A technology for structures and foundations, which is applied to coagulating pavements, roads, bridges and other directions laid on site. It can solve the problems of slow drying, delayed construction period, poor adhesion between layers, etc., and achieve excellent adhesion and shorten construction. effect of time

Active Publication Date: 2021-10-15
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The urethane resin used in the aforementioned urethane waterproofing material layer and adhesive layer is low in cost, so it is widely used in Japan, but the following problems have been pointed out: urethane waterproofing material and asphalt pavement In addition, the interlayer adhesion is poor, and the construction period is delayed due to slow drying

Method used

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Examples

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Embodiment

[0089] Hereinafter, the present invention will be described in more detail using examples.

Synthetic example 1

[0090] [Synthesis Example 1] Preparation of Moisture Curable Urethane Composition (ii-1) for Urethane Waterproofing Material

[0091] In a four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet, and a reflux condenser, 1,000 parts by mass of polytetramethylene glycol (number average molecular weight: 1,000) and 297 parts by mass of dipropylene glycol were mixed, and 661 parts by mass of toluene diisocyanate was added thereto, and reacted at 90° C. for 8 hours under a nitrogen stream to obtain a urethane prepolymer having an NCO% of 2.5 mass % and a weight average molecular weight of 6,080.

[0092] Next, 100 parts by mass of polyoxyethylene polyoxypropylene diol (number average molecular weight: 1,000, content of oxyethylene structure: 20 mass %) and 80 parts by mass of toluene diisocyanate were reacted to obtain NCO% of 16.8 mass % Urethane prepolymer. Next, 40 parts by mass of xylene was added, and 114.5 parts by mass of N-2-isopropyl-3-(2-hydroxyethyl...

Synthetic example 2

[0095] [Synthesis Example 2] Preparation of Moisture Curing Type Urethane Primer (iii-1)

[0096] In a four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet, and a reflux condenser, 300 parts by mass of crude MDI ("Millionate MR-200" manufactured by Nippon Polyurethane Industry Co., Ltd.), polypropylene glycol (number average molecular weight: 700) 210 parts by mass, 474 parts by mass of toluene, and 474 parts by mass of ethyl acetate were reacted at 80°C for 5 hours to obtain a moisture-curable urethane having a solid content of 35% by mass and an NCO% of 5.2% by mass Primer (iii-1).

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Abstract

The problem to be solved by the present invention is to provide a foundation waterproof structure having excellent interlayer adhesion between a urethane waterproof material layer and an asphalt pavement layer. The invention provides a foundation waterproof structure, which is characterized in that a foundation layer (i), a urethane waterproof material layer (ii), a urethane primer layer (iii), and a free radical layer are sequentially stacked from bottom to top. An adhesive layer (iv) obtained by curing the curable composition, and an asphalt pavement layer (v). The urethane waterproof material layer and the asphalt pavement layer in the foundation waterproof structure of the present invention have excellent interlayer adhesion. In addition, since the foundation waterproof structure of the present invention uses a radical curable composition excellent in normal temperature drying properties for the adhesive layer, the construction time of the foundation waterproof structure can be shortened.

Description

technical field [0001] The present invention relates to a foundation waterproof structure having excellent interlayer adhesion between a urethane waterproof material layer and an asphalt pavement layer. Background technique [0002] Recently, early deterioration of foundations of road bridges led by expressways has become apparent due to increasing traffic load, spraying of antifreeze. The mechanism of this early deterioration is considered to be that rainwater, antifreeze, etc. penetrate into the structure through cracks generated in the asphalt pavement and reinforced concrete foundation, causing corrosion of steel bars and reducing the durability of the structure. [0003] As a method of improving the durability of these road bridge foundations, various foundation waterproof structures in which a base layer, a waterproof material layer, and an asphalt pavement layer are sequentially laminated have been studied. [0004] As the foundation waterproof structure, for example...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/12B32B11/04B32B27/40E01C7/18E01C7/32E01D19/08
CPCB32B11/04B32B27/40E01C7/18E01C7/32E01D19/08E01D19/12
Inventor 神崎满幸松本高志西村纪夫
Owner DIC CORP
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