JPH01278482A - Lining of acrylic resin - Google Patents

Abstract

PURPOSE:To make operation efficient and to readily clean devices by blending an acrylic monomer with a polymer soluble or dispersible into the monomer to give the resin solution, dividing the solutions into two solutions, dissolving a polymerization initiator in one of the solutions and a curing promoter in the other and blending both the solutions. CONSTITUTION:A resin solution comprising a monomer (a) of (meth)acrylic acid and/or an ester thereof, a polymer (b) soluble in the monomer (a) or capable of being swollen in the monomer, a plasticizer (c) to dissolve the monomer (a) and a compound (d) containing two or more polymerizable unsaturated bonds in one molecule is used. The components (a) and (b) among the components are essential components. The resin solution is divided into two solutions, the solutions are fed to dissolving tanks 1 and 2, a polymerization initiator is dissolved in the former, a curing promoter in the latter to give a solution A and a solution B, respectively. The solution A and the solution B are fed to a nozzle 7 by pumps 3 and 4, mixed by the nozzle 7 and sprayed upon a hume concrete pipe to carry out lining.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for lining concrete structures, concrete floors, concrete products, etc., particularly humid pipes, with acrylic resin.

[Conventional technology]

The inner walls of concrete hume pipes are lined with resin. When using acrylic resin for such linings, acrylic thread tops are generally used.
Lining is performed by mixing a polymerization initiator into a solution in which a curing accelerator is dissolved.

However, in this lining method, curing occurs in about 15 minutes after mixing the polymerization initiator, so it is necessary to clean the equipment immediately after each lining, resulting in poor workability. was there.

Another method is to dissolve the polymerization initiator in a solvent or plasticizer and mix it with the monomer in which the curing accelerator is dissolved, but in this case there is a problem that the amount of solvent or plasticizer increases and the strength of the lining layer becomes weaker. There was a point.

[Problem to be solved by the invention]

The purpose of the present invention is to solve the above-mentioned problems by making it possible to efficiently perform lining with simple operations, to obtain a lining layer with excellent strength, and to provide a lining layer that is easy to clean and has excellent workability. The purpose of this invention is to propose a lining method for acrylic resin.

[Means to solve the problem]

In the present invention, a resin liquid consisting of at least one monomer component selected from (meth)acrylic acid and its ester and a polymer that can be dissolved or swelled in this monomer component is divided into two liquids, and one liquid is polymerized. Dissolve the initiator,
This is an acrylic resin lining method characterized by dissolving a curing accelerator in the other liquid and mixing both liquids to perform lining.

In the present invention, objects to be lined include humid pipes, concrete structures, concrete floors, concrete products, and other arbitrary objects.

The acrylic resin used in the present invention includes at least one selected from (meth)acrylic acid and its ester.
It is possible to use a monomer component of al mixed with a polymer that can be dissolved or swelled in this monomer component.

As an example of such acrylic resin, for example, (
a) a monomer of (meth)acrylic acid and/or its ester; (b) a polymer that can dissolve or swell in the monomer component; (c) a plasticizer that dissolves in the monomer component; and (d) one molecule. Examples include compounds having at least two polymerizable unsaturated bonds therein. Of these, components (a) and (b) are essential components,
Components (c) and (d) are preferred ingredients.

Monomers (a) include alkyl (meth)acrylates such as methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, butyl acrylate (normal, iso), butyl methacrylate (normal, iso), Acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, methacrylic-2-hydroxyethyl,
Ethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, butylene glycol di(meth)acrylate, hexylene glycol di(meth)acrylate, 2 , 2-bis[4-(meth)acryloyloxyphenyl]propane, 2,2-bis[4-
(meth)acryloyloxycyclohexyl]propane, 2,2-bis[3-(meth)acryloyloxy-2
Examples include -hydroxypropoxyphenyl]propane, trimethylolpropane tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, and dipentaerythritol hexa(meth)acrylate.

Examples of the polymer (b) include monopolymers or copolymers of the above-mentioned monomers, particularly (meth)acrylic acid esters.

Representative examples of the plasticizer (C) include phthalate esters such as dimethyl phthalate, dibutyl phthalate, dicyclohexyl phthalate, dioctyl phthalate, dioctyl phthalate, di-2-ethylhexyl phthalate, diisodecyl phthalate, and dibutylbenzyl phthalate. can.

Also included are internal plasticizers such as α,β-unsaturated carboxylic acid esters that can be copolymerized with (a) such as diethyl maleate, dibutyl maleate, dioctyl maleate, dibutyl fumarate, and dioctyl fumarate. .

Typical polymerizable unsaturated bond compounds (d) are:
Ethylene glycol di(meth)acrylate.

1.2-Propylene glycol di(meth)acrylate.

1. Alkanediol di(meth)acrylates such as 3-butylene glycol di(meth)acrylate, 2.2
-Bis[3-(meth)acryloyloxy-2-hydroxypropoxyphenyl]propane and Showa Kobunshi Co., Ltd.
[Product name: Lipoxy VR-60 or Lipoxy VR-9
Examples include (meth)acrylic acid modified products of epoxy resins such as No. 0.

Generally, the blending ratio of each of these components is (a) 45 to 85% by weight of the monomer component, 5 to 20% by weight of the polymer (b), 1 to 25% by weight of the plasticizer (c), The remainder is (d)
It is preferable to consist of

In the present invention, the resin liquid consisting of the above components (a) to (d) is
Divide into two liquids and dissolve the polymerization initiator in one liquid.

A curing accelerator that promotes curing at room temperature is dissolved in the other liquid.

Components (b) to (d) may be dissolved in either one of the liquids, or in both liquids.The volume ratio of the two liquids should be adjusted to dissolve the polymerization initiator or curing accelerator. You can choose as much as you like as long as you can.

Diacyl peroxide is used as a polymerization initiator.

Alkyl peroxide, aralkyl peroxide.

Peroxides such as peracids and peracid esters, azo compounds, and the like can be used, but among these, diacyl peroxides are preferably used. Specifically, diacyl peroxides include dibenzoyl peroxide,
Examples include diacetyl peroxide, cicapril peroxide, dilauroyl peroxide, and distearoyl peroxide.

As the amines used as the curing accelerator, either primary amines or tertiary amines can be used, but tertiary amines are preferably used.

Specifically, aniline, toluidine, and xylidine.

Phenyldiamine, N,N-dimethylaniline, N
.

N-diethylaniline, N,N-di(β-hydroxyethyl)aniline, N,N-dimethyltoluidine, N,N
-diethyltoluidine, N,N-dimethylanisidine,
N.

N-diethylanisidine, N,N-dimethyl-p-
t-butylaniline, N,N-diethyl-p-t-butylaniline, N,N-diethyl-p-chloroaniline,
Examples include diphenylamine, N,N-(β-hydroxyethyl)-p-toluidine, and the like. Among these, N,N-dimethyl-p-toluidine, N
, N-dimethyl-p-butylaniline, N,N-dimethylanisidine, N,N-dimethyldochloroaniline,
Tertiary amines having an electron donor substituent at least at the 2-position of benzenes are preferred, such as N,N-bis(β-hydroxyethyl)-p-toluidine, and N,N-dimethyl-p-toluidine.

Particularly preferred is N,N-dimethyl-p-t-butylaniline.

The blending ratio of the polymerization initiator and curing accelerator to the resin liquid is the resin liquid io consisting of the above (a) to (d).

The former is approximately 0.1 to 20 parts by weight, and the latter is approximately 0.1 to 20 parts by weight.

In addition, in order to prevent the surface hardening reaction from progressing sufficiently due to radical scavenging by oxygen in the air, it is preferable to add solid paraffin, preferably paraffin wax with a melting point of 40 to 60°C.The proportion of this paraffin in the resin mortar is , resin liquid 1 consisting of the above (a) to (d)
The amount is 0.1 to 1.0 parts by weight per 0.00 parts by weight.

In addition, fillers such as silica sand, kaolin, talc, and calcium carbonate, and colorants such as organic pigments and inorganic pigments may be blended, and these may be blended into either or both of the liquids.

The lining method involves spraying a mixture of a solution containing the polymerization initiator and a solution containing a curing accelerator.

Perform lining. The two liquids may be mixed in a spray device such as a nozzle, or may be mixed by spraying from a separate nozzle.

The lined acrylic resin is 15 to 3
It hardens in 0 minutes to form a lining layer.

The lining layer obtained in this way has good adhesion because the resin solution penetrates into the cracks and gaps of the fume tube and hardens, and since it contains a polymer of acrylic monomer, it has better adhesion than when only the monomer is polymerized. The shrinkage rate is small, and since it contains a compound having two polymerizable unsaturated bonds, it has a three-dimensional structure and has high strength.

After the lining work, it is only necessary to wash the part after the mixing part of the two liquids, and the other parts can be used continuously for a long time, and the workability is excellent.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

A resin liquid consisting of 70 parts by weight of methyl methacrylate, 20 parts by weight of polymethyl methacrylate, 5 parts by weight of l,4-butylene glycol dimethacrylate, and 85 parts by weight of dicyclohexy-polymers is divided in a ratio of 1:1, One A
Diacyl peroxide was added to the solution as a polymerization initiator, and N,N-dimethyl-p was added to the other B solution as a curing accelerator.
- 3 parts by weight of toluidine was dissolved.

FIG. 1 is a system diagram showing the lining method of the embodiment.
In the figure, 1.2 is a dissolution tank in which liquids A and B are dissolved respectively.These liquids A and B are supplied to the nozzle 7 from the line 5゜6 by a pump 3.4, and are fed into the nozzle 7. The mixture is mixed and sprayed into the fume pipe 8 for lining.

The lining layer thus obtained has good adhesion, excellent strength, weather resistance, etc., and can protect the inner surface of the humid tube for a long period of time.

After lining, only the nozzle 7 needs to be cleaned before curing, and the other parts can be used continuously.

〔Effect of the invention〕

According to the present invention, acrylic resin lining can be performed efficiently with simple operations, a lining layer with excellent strength can be formed, and furthermore, it is easy to clean and has excellent workability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram of an embodiment. 1.2 is the dissolution tank, 3.4 is the pump, 7 is the nozzle, 8
is Huyum's canal. Agent Patent Attorney Sei Yanagihara 3.4: Pump 7: Nozzle 8: bz-, - Police

Claims (1)

[Claims] (1) A resin liquid consisting of at least one monomer component selected from (meth)acrylic acid and its ester and a polymer that can be dissolved or swelled in this monomer component is divided into two liquids, and one liquid starts polymerization. A method for lining an acrylic resin, characterized by dissolving a hardening agent in the other liquid, dissolving a curing accelerator in the other liquid, and mixing both liquids to perform lining.