JPH0350080B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a fixing agent used for inserting an anchor bolt into a hole provided in concrete, rock, etc. and fixing the anchor bolt to concrete or rock. The fixing agents for anchor bolts currently on the market generally consist of an easily broken base capsule such as a glass tube that encapsulates a base agent mainly composed of unsaturated polyester resin, and an organic peroxide encapsulated in the base capsule. It consists of hardening agent capsules. This fixing agent is inserted into the hole where the anchor bolt is to be fixed prior to the anchor bolt, then the anchor bolt is inserted into the hole, the capsule is destroyed by the anchor bolt, the fixing agent is mixed, a hardening reaction is caused, and the bolt is Fix it to the hole wall. This adhesive based on unsaturated polyester shrinks during curing, making it difficult to obtain large adhesive strength.
In upward-facing holes such as ceilings, the viscosity of the fixing agent has some effect, but in places where there is moisture, gelation time is particularly long, causing problems such as leakage and difficulty in fixing. In order to solve this problem, the inventor of the present invention has proposed the following fixing agent for anchor bolts as a result of extensive studies, and has already filed a patent application. That is, this fixing agent compensates for the shrinkage of polyester during curing by adding urethane resin to polyester resin that foams by reaction with moisture in a damp place, increases volume, and hardens in a short time. Even in upward facing holes, it is possible to secure the anchor bolt to the hole wall before outflow occurs. However, in such adhesives for anchor bolts, the reaction of the unsaturated polyester and the reaction of the urethane resin occur almost simultaneously, so the reaction of the urethane resin, that is, the foaming, becomes highly foamed, especially in places with moisture, and the cured product becomes There is a practical problem of reduced strength. An object of the present invention is to provide a fixing agent for anchor bolts that eliminates such drawbacks and has excellent storage stability. In order to achieve this object, the present invention provides a base capsule encapsulating a base material mainly composed of an unsaturated polyester and a non-amine polyol, and a polyisocyanate or isocyanate prepolymer and an aromatic tertiary polymer encapsulated in the base capsule. This is a three-component fixing agent for anchor bolts comprising an isocyanate capsule encapsulating an amine and an organic peroxide capsule encapsulating an organic peroxide in a base capsule. The present invention is made by adding urethane resin, which foams by reaction with moisture in damp places, increases volume, and hardens in a short time, to polyester resin, which has high strength and is cheaper than epoxy resins and acrylic resins. In addition, the aromatic tertiary amine encapsulated in the isocyanate capsule acts as a curing accelerator for the unsaturated polyester, and the reaction of the unsaturated polyester takes precedence, and then the reaction of the urethane resin occurs during the reaction of the unsaturated polyester. This not only compensates for the shrinkage of polyester during curing, but also suppresses the foaming of the urethane resin to a low level even in damp locations, producing a cured product with sufficient strength for practical use. It is something. In addition, the present invention is characterized in that the polyol (isocyanate curing agent) encapsulated together with the unsaturated polyester in the base capsule is non-amine based, and the amine encapsulated together with the polyisocyanate in the isocyanate capsule is an aromatic tertiary amine ( curing accelerator for polyester),
As a result of the above, the storage stability of polyester and isocyanate is improved, and the storage stability of the fixing agent for anchor bolts is improved as a whole. The unsaturated polyester resin used in the present invention can be mixed with α, β unsaturated dibasic acids such as maleic anhydride and fumaric acid, or, if necessary, a part thereof with saturated dibasic acids such as phthalic anhydride, isophthalic acid, and terephthalic acid. those substituted with basic acid components, ethylene glycol,
propylene glycol, diethylene glycol,
Styrene, unsaturated polyester obtained by polycondensing glycols such as dipropylene glycol and hydrogenated bisphenol A at a molar ratio of about 1:1,
It is dissolved in unsaturated monomers for crosslinking such as vinyltoluene, chlorostyrene, divinylbenzene, diallyl phthalate, acrylic esters, and methacrylic esters, and a polymerization inhibitor such as hydroquinone is added thereto. Non-amine polyols used in the present invention include sucrose, sorbitol, glycerin, pentaerystol, and the like. The mixing ratio of unsaturated polyester and non-amine polyol to be encapsulated in the base capsule is from 80/20 to unsaturated polyester/non-amine polyol.
The ratio is 30/70, preferably 70/30 to 40/60 (weight ratio). The polyisocyanate used in the present invention can be any of those used in the production of ordinary polyurethane, such as various isomers of toluene diisocyanate and mixtures thereof, purified products and crude products of diphenylmethane diisocyanate, etc.; In terms of curing speed, etc., purified or crude diphenylmethane diisocyanate is suitable. In addition, isocyanate prepolymers include alkylene oxides (e.g., ethylene oxide, propylene oxide, tetrahydrofuran, etc.) and low-molecular polyols (e.g., ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, glycerin, trimethylolpropane, 1,2, 6-hexanetriol,
A polyoxyalkylene ether polyol having a molecular weight of about 500 to about 4,000 obtained by adding it to pentaerythritol, sorbitol, sorbitan, sucrose, etc.) and the above-mentioned polyisocyanate can be used. Aromatic tertiary amines used in the present invention include dimethyl para-toluidine (DMPT), dimethylaniline, diethylaniline, and the like. As the organic peroxide, benzoyl peroxide, cyclohexanone peroxide, and tertiary butyl hydroperoxide are used. The amount of each of the aromatic tertiary amine and organic peroxide to be enclosed in the capsule is 0.5 to 5 parts by weight of the aromatic tertiary amine per 100 parts by weight of the total weight of the unsaturated polyester and non-amine polyol. parts by weight, and 1 to 5 parts by weight of organic peroxide are used. In addition to the above, the main ingredients include organic tin compounds such as dibutyltin laurate, anti-shrinkage agents such as polyethylene and polystyrene, talc, clay, fine silica powder, alumina, barium sulfate, asbestos fibers, glass powder, and bone substances such as glass fibers. materials, desiccants such as cobalt naphthenate, and others. The foaming rate of urethane is preferably 1 to 10%. Next, examples will be shown. Inner diameter 19mm in concrete,
A hole with a depth of 130 mm was drilled. The main ingredient capsule is a test tube with an inner diameter of 16 mm and a length of 110 mm, with a polyethylene stopper. A capsule with a melt-sealed end was selected to fill the capsule depending on the amount used, and the capsule was encapsulated in the main ingredient. The formulation examples and test results are shown in the table below. As shown in the following table, the fixing agent according to the present invention has a short gelation time, a large fixing force (pulling force), and excellent storage stability.

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Claims (1)

[Scope of Claims] 1. A base capsule encapsulating a base containing an unsaturated polyester and a non-amine polyol as main components, and a polyisocyanate or an isocyanate prepolymer and an aromatic tertiary amine encapsulated in the base capsule. A fixing agent for anchor bolts, comprising: an isocyanate capsule encapsulating the isocyanate capsule; and an organic peroxide capsule encapsulating an organic peroxide in a base capsule.