申请人:Sanyo Chemical Industries, Ltd.
公开号:EP3896136A1
公开(公告)日:2021-10-20
The present invention aims to provide a two-component curable urethane adhesive that is easy to handle while it is substantially solvent-free, having weak to strong adhesive properties, and being capable of forming a cured film having excellent physical properties. The present invention provides a two-component curable urethane adhesive containing: a main agent; and a curing agent, the main agent containing at least one of a hydroxy group-containing urethane prepolymer (P1) or a polyol component (A), the hydroxy group-containing urethane prepolymer (P1) being a reaction product between the polyol component (A) and an organic polyisocyanate component (B), the curing agent containing at least one of an isocyanate group-containing urethane prepolymer (P2) or an organic polyisocyanate component (B), the isocyanate group-containing urethane prepolymer (P2) being a reaction product between the polyol component (A) and the organic polyisocyanate component (B), wherein the two-component curable urethane adhesive satisfies the following properties (1) to (5):
(1) at least one of the polyol component (A) used in the hydroxy group-containing urethane prepolymer (P1) or the polyol component (A) used as the main agent contains a polyol (A1) having at least one of a group represented by a formula (1) or a group represented by a formula (2) at a molecular end thereof, and a total number of groups represented by the formula (1) in the polyol (A1) accounts for 40% or more based on a total number of groups represented by the formulas (1) and (2) in the polyol (A1) ;
(2) an average total unsaturation degree of all the polyol components (A) used in the two-component curable urethane adhesive is 0.010 meq/g or less;
(3) a weight average molecular weight of each of the urethane prepolymer (P1) and the urethane prepolymer (P2) is 1,000 to 100,000;
(4) a chemical formula weight or number average molecular weight of each of the polyol component (A) and the organic polyisocyanate component (B) is 20,000 or less; and
(5) a total weight of solvents in the main agent (excluding the polyol component (A)) and solvents in the curing agent (excluding the organic polyisocyanate component (B)) accounts for 5 wt% or less based on a total weight of the main agent and the curing agent,
wherein in the formulas (1) and (2), each a is independently an integer of 0 or greater.
本发明旨在提供一种双组分可固化聚氨酯粘合剂,该粘合剂易于操作,同时基本上不含溶剂,具有弱到强的粘合性能,并能形成具有优异物理性能的固化膜。本发明提供了一种双组分可固化聚氨酯粘合剂,它含有主剂主剂含有至少一种含羟基的聚氨酯预聚物 (P1) 或多元醇组分 (A),含羟基的聚氨酯预聚物 (P1) 是多元醇组分 (A) 和有机多异氰酸酯组分 (B) 的反应产物、固化剂含有含异氰酸酯基的聚氨酯预聚物(P2)或有机多异氰酸酯组分(B)中的至少一种,含异氰酸酯基的聚氨酯预聚物(P2)是多元醇组分(A)和有机多异氰酸酯组分(B)之间的反应产物,其中双组分可固化聚氨酯胶粘剂满足以下特性(1)至(5):
(1) 含羟基聚氨酯预聚物 (P1) 中使用的多元醇组分 (A) 或作为主剂使用的多元醇组分 (A) 中至少有一种含有多元醇 (A1),其分子末端至少有一个由式 (1) 所代表的基团或一个由式 (2) 所代表的基团、且多元醇(A1)中由式(1)代表的基团总数占多元醇(A1)中由式(1)和(2)代表的基团总数的 40%或以上;
(2) 双组分固化型聚氨酯胶粘剂中使用的所有多元醇组分(A)的平均总不饱和度为 0.010 meq/g 或以下;
(3) 聚氨酯预聚物(P1)和聚氨酯预聚物(P2)各自的重量平均分子量为 1 000 至 100 000;
(4) 多元醇组分(A)和有机多异氰酸酯组分(B)各自的化学式重量或数均分子量为 20,000 或以下;以及
(5) 基于主剂和固化剂的总重量,主剂(不包括多元醇组分(A))和固化剂 (不包括有机多异氰酸酯组分(B))中溶剂的总重量占 5 wt%或以下、
其中,在式 (1) 和 (2) 中,每个 a 独立地为 0 或更大的整数。