Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1990-07-30
1991-12-24
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528 75, 526227, 526301, C08G 1867
Patent
active
050754041
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
This invention relates to a concrete-protective material to coat the surface of concrete.
TECHNICAL BACKGROUND
In the fields of civil engineering and construction, processes for spray painting and resin lining on the surface of a concrete structure to prevent deterioration of the concrete structure are widely known.
Further, processes for improvement of adhesion, gas permeability, water permeability, etc., by incorporating a synthetic polymer emulsion into cement paste and cement mortar are also known, and as a process for improvement of adhesion of cement mortar, there is a process for precoating the surface with a synthetic polymer emulsion to promote adhesion of the mortar, as is described in Japanese Patent Publication No. B-Sho-44-18757.
The above prior techniques have a problem that it cannot but rely on periodic repainting and mending of an outer surface to maintain long durability, since they do not give any sufficient adhesion to concrete.
DISCLOSURE OF THE INVENTION
In view of the above problem, this invention aims to provide a concrete-protective material which is excellent not only in adhesion to concrete but also in durability.
BEST MODE FOR CARRYING OUT THE INVENTION
This invention relates to a concrete-protective material comprising by the following general formula ##STR2## wherein R.sub.1 is selected from (a) an alkylene group having 2 to 12 carbon atoms and (b) an organic group having 4 to 12 carbon atoms, having at least two alkylene chains bonded through at least one oxygen atom where each of the alkylene chains has at least two carbon atoms, and represented by formula (CH.sub.2).sub.n --O--(CH.sub.2).sub.m (in which n and m may be different or the same, n+m is 4 to 12, and both n and m represent integers of not less than 2), and R.sub.2 represents hydrogen or a methyl group, a hydroxyl group, 2 isocyanate groups, and copolymerizable with the components (A) and (B),
In the dicyclopentadiene derivative as the component (A) in this invention, a monovalent organic group having an ethylenic double bond represented by the following formula ##STR3## is attached to the 8-position or 9-position of its dicyclopentadiene group.
In the above formula, R.sub.1 and R.sub.2 are as defined previously.
Examples of the dicyclopentadiene derivative represented by the above general formula include dicyclopentenyloxyalkyl acrylates or methacrylates such as dicyclopentenyloxyethyl acrylate, dicyclopentenyloxyethyl methacrylate, dicyclopentenyloxypropyl acrylate, etc., acrylic esters or methacrylic esters of polyalkylene glycol dicyclopentadiene monoether such as acrylic ester or methacrylic ester of diethylene glycol dicyclopentenyl monoether, etc., and dicyclopentenyloxyethyl methacrylate is preferable.
The dicyclopentadiene derivative represented by the above general formula is used in an amount of 10 to 90 parts by weight. When the amount is less than 10 parts by weight, the adhesion strength is degraded, and when it exceeds 90 parts by weight, the drying ability is poor.
Examples of the component (B), an ethylenically unsaturated monomer having a hydroxyl group, include hydroxyalkyl acrylates such as 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxybutyl acrylate, and corresponding hydroxyalkyl methacrylates, and 2-hydroxyethyl methacrylate is preferable. The amount thereof for use is 5 to 50 parts by weight. When the amount is less than 5 parts by weight, the drying ability is poor and when it exceeds 50 parts by weight, the adhesion to concrete is degraded.
Examples of the component (C), a polyvalent isocyanate compound having not less than 2 isocyanate groups, are compounds having not less than 2 isocyanate groups, such as polymethylene polyphenyl polyisocyanate, hexamethylene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, lysine diisocyanate, diphenylmethane diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, cyclohexylmethane diisocyanate, methylcyclohexane diisocyanate, isopropylidenebis(4-cyclohexyl isocyanate), burette fo
REFERENCES:
patent: 4985523 (1991-01-01), Mochizuki et al.
Iwami Etsuji
Ohwada Takeo
Tanaka Kazuyuki
Hitachi Chemical Company Ltd.
Welsh Maurice J.
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