JPS612779A - Binding agent for anchor bolt - Google Patents

Abstract

PURPOSE:Titled binding agent that is obtained by adding aggregates and a curing agent, in a specific proportion, to a binding agent containing specific amounts of monomers such as methacrylic acid esters and polymers soluble in the monomer at a specific ratio, thus showing shortened curing time under lower temperatures and increased binding strength. CONSTITUTION:The objective binding agent is obtained by combining (A) 100pts. wt. of a binding composition containing (i) 70-95wt% of a monomer mixture of 60-99.8wt% of at least one of methacrylic acid esters, 0-40wt% of at least one of acrylic acid esters, 0-5wt% of at least one of unsaturated carboxylic acids and 0.2-15wt% of at least one of tertiary amines and (ii) 5-30wt% of polymers soluble in the monomer mixture such as polymer of methyl methacrylate, and, when needed, (B) a polymerization inhibitor such as hydroquinone, with (C) 400- 950pts.wt. of aggregates such as sand and (D) a curing agent such as organic peroxide and filling narrow glass tubes with the resulting composition. USE:The resulting binding agent is used of fix anchor bolts to concrete constructions.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a fixing agent trap for fixing isobaric anchor bolts to concrete structures, and particularly relates to a fixing agent that is extremely easy to handle even in low-temperature atmospheres.・It is.

[Prior art]

Recently, construction, repair, and reinforcement work of concrete structures, such as buildings and expressways, has been widely carried out. To carry out such construction work, it is necessary to secure anchor bolts to concrete structures, etc. in order to attach construction materials to the concrete structures, etc., and so far, there have been Various fixing agents for anchor bolts have been developed, such as those shown in Japanese Patent No. 47-2249. However, these adhesives use polyester resin, epoxy resin, phenol resin, melamine resin, polyurethane resin, etc., but the resins used for conventional adhesives require a long curing time of about 5 hours or more at extremely low temperatures (below freezing). Requirement remains a major issue.

[Purpose of the invention]

An object of the present invention is to provide a fixing agent for anchor bolts that takes a short curing time even in a low-temperature atmosphere and has a fixing performance comparable to or higher than that of conventional bonding agents.

[Structure of the invention]

The present invention provides 100 parts by weight of a fixing composition prepared by mixing 70 to 95% by weight of the following monomer (I) and 5 to 30% by weight of a polymer (If) soluble in monomer (I). for aggregate 400
A fixing agent for anchor bolts obtained by adding ~950 parts by weight and a hardening agent.

[Monomer (I)]

(A) 60 to 99.8% by weight of at least one monomer selected from methacrylic esters, aromatic vinyl compounds, vinyl cyanide compounds, and vinyl esters; (B) 0 to 40% by weight of at least one acrylic ester %, (C) 0-5% by weight of at least one unsaturated carboxylic acid
, (D) Monomer consisting of 0.2 to 15% by weight of at least one tertiary amine The monomer (A) which is the main component of the monomer (I) is a methacrylic acid ester or an aromatic vinyl compound. .

A small amount of monomer selected from vinyl cyanide compounds and vinyl esters is mentioned, and is contained in monomer (I) in an amount of 60 to 99.8% by weight.

Specific examples of methacrylic esters used as monomers include methyl methacrylate, ethyl methacrylate, and n-butyl methacrylate.

Examples include i-butyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate, and lauryl methacrylate.

Specific examples of the aromatic vinyl compound used as the monomer (A) include styrene9. α-methylstyrene, vinyltoluene, t-butylstyrene.

Examples include styrene monomers such as chlorostyrene and substituted monomers thereof.

Specific examples of vinyl cyanide compounds used in the monomer (A) include acrylonitrile, methacrylonitrile,
Examples include α-chloroacrylonitrile.

Specific examples of vinyl esters used in monomer (A) include vinyl acetate and vinyl acrylate.

Examples include vinyl butyrate.

In the present invention, it is possible to contain at least one type of acrylic ester (B) in the monomer (I) in a range of 0 to 40% by weight. Specific examples of the acrylic ester include methyl acrylate, ethyl acrylate, and n-butyl acrylate.

i-butyl acrylate, t-butyl acrylate.

Examples include 2-ethylhexyl acrylate.

In the present invention, monomer (I) may contain at least one unsaturated carboxylic acid (C) in an amount of 0 to 5% by weight. Specific examples of the unsaturated acid include acrylic acid, methacrylic acid, crotonic acid, itaconic acid, and the like.

In the present invention, the monomer component constituting the monomer (I) contains 0.2 to 15% by weight of at least one tertiary amine (D) as an accelerator in addition to the monomer (A). The amount is preferably 0.2 to 5% by weight. If the content of the tertiary amine (D) in the monomer (I) is less than 0.2% by weight, the curing time at low temperatures becomes longer, which is not preferable.

The tertiary amine (D) preferably has at least one aromatic residue bonded to the nitrogen atom, especially KN,N'-dimethylaniline.

N,N'-dimethyl-P,-toluidine, N,N'-
Di(hydroxyethyl)-P-toluidine, N, N'
-Di(2-hydroxypropyl)-P-)luidine is preferably selected from at least one amine compound.

In the present invention, the above monomer (I) is used as the fixing composition.
) and 5 to 30% by weight of the polymer (It) soluble in the monomer (I).

The polymer (n) is added for the purposes of controlling the viscosity of the fixing composition, shortening the curing time, and improving strength and durability.

If the addition ratio of the polymer (II) is too low, the curability will be poor, and if the addition ratio is too high, the viscosity will become too high, resulting in uneven mixing with the aggregate and curing agent, which is undesirable. .

Further, in order to obtain a fixing agent for anchor bolts having excellent performance, it is necessary that the polymer (II) is soluble in monomer (I) K.

In the present invention, the method for producing the polymer (II) is not particularly limited, and it can be obtained by a conventional polymerization method.

In the present invention, the polymer (II) can be either a homopolymer or a copolymer.

Examples of monomers constituting the polymer (I) include methacrylic esters such as methyl methacrylate and ethyl methacrylate; acrylic esters such as methyl acrylate, ethyl acrylate, and n-butyl acrylate; styrene, α- Examples include aromatic vinyl compounds such as methylstyrene; vinyl cyanide compounds such as acrylonitrile and methacrylonitrile; and vinyl esters such as vinyl acetate and vinyl acrylate. At least one of these monomers is used. Furthermore, it is also possible to contain an unsaturated carboxylic acid depending on the case.

In the present invention, cases where the composition of the monomer constituting the polymer (If) is the same as that of the monomer (I) are also included, but in this case, the polymerization conversion of the polymer (II) rate to 30
The fixing composition of the present invention can be obtained by adding the above-mentioned tertiary amine in an amount of 0.2 to 15% by weight based on the monomer remaining in the polymer (n). It is also possible to make it a thing.

In the present invention, a polymerization inhibitor, a plasticizer, a modifier, a crosslinking agent, a stabilizer, etc. are added as necessary to the fixing composition obtained by mixing the monomer (I) and the polymer. It is also possible.

In the present invention, commonly used polymerization inhibitors such as hydroquinone can be used.

In the present invention, the plasticizer includes phthalate ester,
Examples include polyester polymer plasticizers and epoxy polymer plasticizers, and mixtures thereof may be used.

In the present invention, examples of modifiers include epoxy resins and copolymers of vinyl acetate and vinyl chloride.

In the present invention, examples of the crosslinking agent include those commonly used such as alkanediol di(meth)acrylate, polyoxyalkylene-glycol di(meth)acrylate, triallylisocyanurate, and allyl(meth)acrylate.

In Kinei Akijo, paraffin is used as a stabilizer.

Examples include wax and higher fatty acids.

In the Kinai Akira trap, aggregate is added in the range of 400 to 950 parts by weight to 100 parts by weight of the fixing composition obtained by mixing the monomer (I) and the polymer (Im). However, specific examples of aggregate include sand and silica sand.

Examples include quartz sand, calcium carbonate, alumina, and glass peas.

Further, in the present invention, it is preferable to use a combination of aggregates having different particle sizes.

The fixing agent of the present invention is produced within 2 hours at a temperature range of -30°C to 50°C using a known redox catalyst consisting of a combination of a tertiary amine, which is an accelerator contained in the fixing composition, and a curing agent. It is possible to harden it to Although various types of redox catalysts can be used, it is advantageous to use organic peroxides as curing agents.

A preferred example of the organic peroxide is benzoyl peroxide.

The peroxide is preferably in the form of a paste or powder diluted with an inert liquid or solid to a concentration of about 50% to avoid handling hazards.

In order to obtain a preferred curing time of 10 to 90 minutes for the anchor bolt fixing agent formulation of the present invention, it is necessary to adjust the amount of curing agent and/or accelerator depending on the temperature of the formulation or the temperature during operation. There is. When an organic peroxide is used as a curing agent, it is preferably used in an amount of 0.25 to 5 parts by weight per 100 parts by weight of the fixing composition used in the present invention.

In the present invention, when the fixing composition and the curing agent are mixed together, the polymerization reaction starts quickly, so it is necessary to mix the curing agent with the fixing composition immediately before fixing the anchor bolt. A preferable form of the fixing agent that satisfies the above conditions is to fill a sealed small thin glass tube (A) with the fixing composition, and to mix the aggregate and hardening agent with the glass tube (A) into the glass tube (A). A sealed small thin glass tube filled with a fixing composition (a), a sealed small thin glass tube filled with a hardening agent (b), and a bone. Examples include those filled with material into a cylindrical body to prevent damage.

Here, the cylindrical body can be made of glass or plastic, and is preferably one that can be relatively easily broken by an anchor bolt.

When using the anchor bolt fixing agent shown above,
A capsule of the fixing agent is inserted in advance into the hole of the base material in which the Ajicar bolt is to be embedded, and then an anchor bolt is implanted, and the capsule is destroyed with the anchor bolt.
By sufficiently mixing, polymerization is initiated, and by curing, the anchor bolt can be fixed to the base material.

The present invention will be explained in more detail with reference to the following examples.

<Examples 1 to 6 and Comparative Examples 1 and 2> Each component (A) to (D) of monomer (I) and polymer (I
A fixing composition (I) is prepared by mixing I) in the amounts shown in the table.
(6) was obtained.

Further, fixing compositions (I) to (6) and each component (E) to (G) shown in the table were mixed.

After this, it will be 30cm long x 30cr wide! L x height 6
Adhesive strength was determined using a Kenken type adhesion tester K (manufactured by Shiraki Kajuuki Co., Ltd.) using crrL pavement concrete blocks.

In addition, as a comparative example, fixing compositions (
+) and (li) were prepared, and the adhesive strength was determined in the same manner as in the example.

〔Effect of the invention〕

As described in detail above, it can be seen that the fixing agent for anchor bolts of the present invention has a short curing time (and high fixing performance) even at extremely low temperatures.

Claims (1)

[Claims] 1. 70 to 95% by weight of the following monomer (I) and monomer (I)
) 400 to 95 parts by weight of aggregate to 100 parts by weight of a fixing composition prepared by mixing 5 to 30% by weight of polymer (II) soluble in
Anchor bolt fixing agent obtained by adding 0 parts by weight and a curing agent [monomer (I)] (A) At least one selected from methacrylic acid esters, aromatic vinyl compounds, vinyl cyanide compounds, and vinyl esters. 60-99.8% by weight of one monomer, (B) 0-40% by weight of at least one acrylic ester, (C) 0-5% by weight of at least one unsaturated carboxylic acid.
(D) Monomer 2 consisting of 0.2 to 15% by weight of at least one tertiary amine, a sealed small narrow glass tube (A) is filled with a fixing composition, and the glass tube (A) and A fixing agent 3 for anchor bolts according to claim 1, characterized in that aggregate and a hardening agent are filled in a cylindrical body; ), a sealed small thin glass tube filled with a hardening agent (b), and a cylindrical body filled with aggregate.