Search

JP-7855419-B2 - Method for manufacturing a laminate, the laminate itself, and the asphalt waterproofing layer with urethane waterproofing material.

JP7855419B2JP 7855419 B2JP7855419 B2JP 7855419B2JP-7855419-B2

Inventors

  • 吉成 昭人
  • 今井田 和典
  • 濱田 有紀子
  • 桂田 恭宏

Assignees

  • ＡＧＣポリマー建材株式会社

Dates

Publication Date
20260508
Application Date
20220620

Claims (10)

  1. A method for manufacturing a laminate, comprising providing a laminate on an asphalt waterproofing layer, a urethane coating waterproofing layer, and a topcoat layer on the urethane coating waterproofing layer, The process includes a primer layer formation step of forming a primer layer, which is a hardened layer of a primer layer formation composition, on the asphalt waterproof layer, and a urethane coating formation step of forming the urethane coating waterproof layer on the primer layer. The primer layer forming composition comprises a first compound E having two or more epoxy groups in its molecule, and a second compound H having two or more curable functional groups in its molecule that can react with epoxy groups. At least one of the first compound E and the second compound H has a polysulfide structure P represented by the following formula 1, A method for producing a laminate, comprising applying a mixture of a main component composition containing an isocyanate group-terminated prepolymer obtained by reacting a polyol with a polyisocyanate compound, and a curing agent composition containing a compound having an active hydrogen-containing group, onto the primer layer in the urethane coating film formation step. -(R 10 -Sx)- ...Formula 1 (In the formula, R 10 represents a divalent or trivalent organic group, x represents an integer from 1 to 5, including at least x = 2, and the average value of x is greater than 1 and less than or equal to 2.5.)
  2. The method for producing a laminate according to claim 1, wherein the first compound E comprises compound E1 having the polysulfide structure P.
  3. The method for producing a laminate according to claim 2, wherein the compound E1 includes a compound E11 represented by the following formula 2. (In the formula, R1 and R3 each independently represent an organic group, R2 represents an organic group containing -( R4 -Sx)-, R4 represents a divalent or trivalent organic group, x represents an integer from 1 to 5, including at least x=2, and the average value of x is greater than 1 and less than or equal to 2.5.)
  4. The method for producing a laminate according to claim 1, wherein the second compound H comprises compound H1 having the polysulfide structure P.
  5. The method for producing a laminate according to claim 4, wherein the compound H1 comprises a compound H11 represented by the following formula 6. HS-(R 11 -Sx) n -R 11 -SH...Formula 6 (In the formula, R 11 represents a divalent organic group containing an -O-CH 2 -O- bond, or a trivalent organic group containing -CH 2 C(H)CH 2 -; n represents the number of repetitions of (R 11 - Sx) and is an integer from 1 to 200; x is an integer from 1 to 5, including at least x=2, and the average value of x is greater than 1 and less than or equal to 2.5.)
  6. The method for producing a laminate according to claim 1, wherein the primer layer forming composition further comprises a curing catalyst.
  7. A method for producing a laminate according to any one of claims 1 to 6, wherein the content ratio of the epoxy group to the total number of moles of the epoxy group and the number of moles of the polysulfide structure P in the primer layer-forming composition is 40 to 90 mol%.
  8. The method for manufacturing a laminate according to claim 1, wherein in the primer layer formation step, the primer layer formation composition is applied to the asphalt waterproofing layer in an application amount of 0.1 to 1.0 kg/ m² and cured to form the primer layer.
  9. A laminate provided on an asphalt waterproofing layer, the laminate comprising a primer layer on the asphalt waterproofing layer, a urethane coating waterproofing layer on the primer layer, and a topcoat layer on the urethane coating waterproofing layer, The primer layer comprises a reaction product of a first compound E having two or more epoxy groups in its molecule and a second compound H having two or more curable functional groups in its molecule that can react with epoxy groups, wherein the reaction product has a polysulfide structure P represented by the following formula 1. The aforementioned urethane coating waterproof layer is a laminate comprising a reaction product of an isocyanate-terminated prepolymer obtained by reacting a polyol with a polyisocyanate compound, and a compound having an active hydrogen-containing group. -(R 10 -Sx)- ...Formula 1 (In the formula, R 10 represents a divalent or trivalent organic group, x represents an integer from 1 to 5, including at least x = 2, and the average value of x is greater than 1 and less than or equal to 2.5.)
  10. An asphalt waterproof layer with a urethane waterproofing material, comprising an asphalt waterproof layer and a urethane waterproofing material covering the asphalt waterproof layer, wherein the urethane waterproofing material includes the laminate described in claim 9 .

Description

This invention relates to a method for manufacturing a laminate on an asphalt waterproofing layer, a laminate provided on an asphalt waterproofing layer, and an asphalt waterproofing layer with a urethane waterproofing material. Asphalt waterproofing layers, consisting of an asphalt layer, are known as waterproofing layers to be installed on concrete substrates of buildings and other structures. As a method for repairing asphalt waterproofing layers that have deteriorated over time, a torch method (for example, Patent Document 1) is known, which involves laminating an asphalt waterproofing sheet on top of the asphalt waterproofing layer. The torch method requires the use of heavy asphalt sheets, where the asphalt on the back of the sheets is melted with a torch burner and then adhered to the asphalt waterproofing layer to be repaired. This method requires skilled workers and presents challenges in terms of working conditions. Patent Document 2 describes a urethane-based coating waterproofing method suitable for waterproofing rooftops, verandas, balconies, and open corridors of buildings, particularly those in residential environments. Japanese Patent Publication No. 2010-255336Japanese Patent Publication No. 2002-250099 The following definitions of terms apply throughout this specification and the claims. A numerical range represented by "~" means a range of numbers whose lower and upper limits are the numbers before and after "~". An "active hydrogen-containing group" is at least one group selected from the group consisting of a hydroxyl group, a carboxyl group, an amino group, a monovalent functional group obtained by removing one hydrogen atom from a primary amine, and a thiol group, all of which are bonded to a carbon atom. "Active hydrogen" refers to hydrogen atoms based on the active hydrogen-containing group and hydrogen atoms based on the hydroxyl group of water. In this specification, the number-average molecular weight is the polystyrene-equivalent molecular weight obtained by measuring it by gel permeation chromatography (GPC) using a calibration curve prepared with standard polystyrene samples of known molecular weight. ≪Method for manufacturing laminates≫ The manufacturing method of the laminate according to this embodiment includes a step of forming a primer layer, which is a hardened layer of a primer layer forming composition, on an asphalt waterproof layer (primer layer formation step), and a step of forming a urethane coating waterproof layer on the primer layer (urethane coating formation step). <Composition for forming primer layer> The primer layer-forming composition comprises a first compound E having two or more epoxy groups in its molecule, and a second compound H having two or more curable functional groups in its molecule that can react with epoxy groups. At least one of the first compound E and the second compound H has a polysulfide structure P represented by the following formula 1. -(R 10 -Sx)- ...Formula 1 In formula 1, R 10 represents a divalent or trivalent organic group. R 10 can be either a divalent organic group containing an -O-CH 2 -O- bond or a trivalent organic group containing -CH 2 C(H)CH 2- , with examples being -CH 2 CH 2 OCH 2 OCH 2 CH 2- or -CH 2 C(H)CH 2- . In equation 1, x represents an integer from 1 to 5. The polysulfide structure P represented by formula 1 may be present in one or more molecules, and may be present in quantities of 1 to 50. The polysulfide structure P represented by formula 1 includes at least x = 2, and the average value of x is greater than 1 and less than or equal to 2.5. In a primer layer-forming composition, the first compound E includes either or both of compound E1 having a polysulfide structure P and compound E0 not having a polysulfide structure P. In a primer layer-forming composition, the second compound H comprises either or both of compound H1 having a polysulfide structure P and compound H0 not having a polysulfide structure P. The first compound E and the second compound H are combined such that the primer layer-forming composition contains at least one of compound E1 and compound H1. <Compound E1> Compound E1 is a compound having two or more epoxy groups in its molecule and a polysulfide structure P represented by formula 1. Compound E1 may be used alone or in combination of two or more types. Compound E1 is preferably compound E11, represented by the following formula 2. In Equation 2, R1 and R3 each independently represent an organic group, R2 represents an organic group containing -( R4 -Sx)-, R4 represents a divalent or trivalent organic group, x represents an integer from 1 to 5, including at least x=2, and the average value of x is greater than 1 and less than or equal to 2.5. R2 is, for example, -Z-( R4 -Sx)m- R5 -Y-. R5 represents a divalent or trivalent organic group. R4 and R5 may be the same or different. Preferred embodiments of R4 and R5 are the same as those of R10 . Y and Z are divalent groups selected from -