JPH0585719B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bolt fixing agent for fixing anchor bolts to concrete, rock, etc. (hereinafter referred to as base material). Conventionally, the method of fixing an anchor bolt was to drill a hole in the base material, load a fixing agent into the hole, and insert the anchor bolt while applying a rotational impact to the anchor bolt connected with a hammer drill, etc., to crush the container and store it in the container. A method is known in which an anchor bolt is fixed by curing unsaturated polyester resin. The fixative used in this method is to fill a glass container with a resin whose main component is liquid unsaturated polyester resin, and then fill the container with a hardening agent whose main component is an organic peroxide such as benzoyl peroxide. Fixatives are known in which a fixative is sealed in a glass tube. However, these fixatives had the following drawbacks. Since the resin is mainly composed of unsaturated polyester and has a large curing shrinkage rate, it was not possible to develop sufficient adhesion even in the initial strength. In addition, there was a defect in that the cured resin at the anchor bolt fixing part was eroded by the alkaline components of the concrete, and the fixing strength gradually decreased over time after the anchor bolt was installed. Furthermore, the environment in which the anchor bolt is used is, for example, an environment where it is constantly or intermittently in contact with chemicals such as acids, alkalis, and organic solvents, or an environment where it is constantly exposed to highly erosive sea breeze or sea water such as on the coast. In this case, the fixing part of the anchor bolt was eroded and sufficient fixing performance could not be maintained. The present invention solves these deficiencies and provides a bolt fixing agent with excellent corrosion resistance that shows minimal deterioration over time and can maintain a sufficiently firm fixing force even in environments with strong erosion. . Furthermore, it has been found that according to the present invention, it is possible to maintain sufficient bolt fixing force even to a base material that is subject to repeated vibrations. That is, the present invention provides a bolt fixing agent comprising a container, a resin contained in the container, and a curing agent contained in the container and separated from the resin, in which the main component of the resin is an acrylic urethane resin. Alternatively, the present invention relates to a bolt fixing agent characterized by being made of an acrylic urethane resin containing a reactive monomer. The structure of the fixative of the present invention can be designed over a wide range and is not particularly limited. Examples include those in which aggregate is housed in an outer container and sealed as necessary, or those in which an inner container is sealed with resin and a curing agent and aggregate are housed in an outer container and sealed as necessary. However, the aggregate may be mixed with either the resin or the curing agent. Containers that can be used in the present invention are those that do not break during transportation or storage, are easily broken into pieces when inserting anchor bolts, and are made of glass,
It is made of ceramics and synthetic resin, and the synthetic resin can also take the form of a film. The main component of the resin in the present invention is an acrylic urethane resin, and all known resins can be used, but it preferably contains an acrylic or methacrylic group and a urethane group, and contains substituted urea, allophanate, biuret, uretidinedione, and isocyanurate. , ester, ether, and hydrocarbon. These acrylic urethane resins are made from, for example, combinations of polyesters, polyethers, polyether esters, polyhydrocarbons containing OH groups and aliphatic, alicyclic, aromatic, and araliphatic polyisocyanate monomers and polymers. A stoichiometric amount of 2-hydroxyethyl acrylate (2
-HEA) or 2-hydroxyethyl methacrylate (2-HEMA). Reactive monomers that can be used in the present invention are:
Examples include styrene, vinyltoluene, chlorostyrene, methyl methacrylate, and diallyl phthalate, which can be used by mixing with acrylic urethane resin. The viscosity of the acrylic urethane resin or the mixture of the acrylic urethane resin and the reactive monomer is preferably 5000 poise (25° C.) or less. If the temperature exceeds 5000 poise (25℃), the sedimentation rate of the aggregate in the resin will slow down significantly, resulting in a decrease in productivity, and the hardening agent and aggregate will not be sufficiently dispersed during pouring and agitation, resulting in uneven curing. As a result, sufficient adhesion force cannot be obtained. Curing agents that can be used in the present invention include, for example, benzoyl peroxide, methyl ethyl ketone peroxide, lauryl peroxide,
Peroxides such as dicumyl peroxide, tert-butyl peroctoate, kyumene hydroperoxide, and cyclohexanone peroxide; azo compounds such as azobisisobutyronitrile; cobalt naphthenate, manganese naphthenate, calcium naphthenate, Metal soaps such as cobalt octoate; chelate compounds such as vanadyl acetylacetonate and iron acetylacetonate. It is preferred to use amines such as dimethylaniline, diethylaniline, dimethyl para-toluidine in combination with the curing agent to speed up curing. The fixative of the present invention may contain aggregate or filler if necessary. The aggregate is not particularly limited, but natural crushed stone, magnesia clinker, or artificial stone such as mining furnace slag can be used. The filler is not particularly limited, but calcium carbonate, calcium sulfate, silicic anhydride, clay, and the like can be used. The composition of the bolt fixing agent of the present invention can be selected from a wide range depending on the purpose of use, but one example is a mixture consisting of 60 to 100 parts by weight of an acrylic urethane resin and 0 to 40 parts by weight of a reactive monomer. 0.5 to 15 parts by weight of curing agent, 0 parts by weight of aggregate or filler per 100 parts by weight
~500 parts by weight. Compared to conventional bolt fixing agents, the bolt fixing agent of the present invention provides a stronger fixing force and maintains the fixing force for a long period of time. Furthermore, it is possible to maintain sufficient adhesion force even in environments with strong erosion or severe vibration. Furthermore, since the bolt fixing agent of the present invention is more compatible with acrylic urethane resin than conventional ones, it not only exhibits the chemical and physical characteristics of the resin itself, but also tube,
It is presumed that the effect was greater than expected because the debris of various sizes, including synthetic resin, was mixed together and solidified. Hereinafter, embodiments of the present invention will be specifically explained with reference to Examples. Example 1 0.45 g of benzoyl peroxide diluted with calcium sulfate to a concentration of 50% was sealed in a glass inner container with an outer diameter of 5 mm and a length of 70 mm, and the container was sealed with an outer diameter of 13 mm and a length of 85 mm.
It is housed in a glass outer container with a diameter of 1.0 to 3.3 mm.
A mixture of 6.9 g of magnesia clinker of mm, 3.0 g of acrylic urethane resin, and 1.3 g of styrene [viscosity
15 poise (at 25°C)] and 0.02 g of dimethylaniline, and then sealed with a nylon cap to prepare a fixative. The acrylic urethane used here is “Dulaneto 24A-100” manufactured by Asahi Kasei Corporation.
(Isocyanate polymer NCO content 23%)
2-hydroxyethyl acrylate in the same molar amount as OH/NCO was added and reacted at room temperature. Next, the inner diameter of the concrete with a compressive strength of 250Kg/cm ² was
After drilling a hole of 14.5 mm and length of 100 mm and inserting the above fixing agent into the hole, insert a fully threaded S45C hardened bolt with a 45 degree cut at the tip to the bottom of the hole while applying rotational impact with an electric hammer. The pullout load of the bolt was measured after 3 days and 3 months. As an alkali resistance test, a concrete block after bolting was immersed in a saturated calcium hydroxide solution, and the pullout load was measured 45 days later. As a vibration resistance test, the concrete block after bolting was fixed to the main body of a "Shimadzu servo pulser U5-QF10" testing machine, and a vibration load was applied to the bolt. As for the vibration load, a tensile load of 0.6 ton was applied repeatedly 5000 times, and then a repeated tensile load was applied 5000 times each time the tensile load was increased by 0.6 ton. The vibration load was applied to a maximum of 4.8 tons, and the pullout load was measured immediately after that. The results are shown in Table 1. Example 2 A product was prepared in the same manner as in Example 1 except that 0.45 g of methyl ethyl ketone peroxide was used as a hardening agent in the same container as in Example 1, and various tests were conducted. The results are shown in Table 1. Example 3 A fixative was produced in the same manner as in Example 1, except that the acrylic urethane resin in Example 1 was produced from polypropylene glycol, diphenylmethane diisocyanate, and 2-hydroxyethyl methacrylate, and various I did a test. The results are shown in Table 1. In this case, the viscosity of the styrene and acrylic urethane resin mixture was 30 poise (25°C). Example 4 In Example 1, styrene was not used, except that 4.3 g of an acrylic urethane resin with a viscosity of 125 poise (25°C) manufactured from polybutylene glycol, diphenylmethane diisocyanate, and 2-hydroxyethyl acrylate was used. A fixative was produced in the same manner as in Example 1, and various tests were conducted. The results are shown in Table 1. Comparative Example 1 A fixative was produced in the same manner as in Example 1, except that 4.3 g of styrene-modified unsaturated polyester resin with a viscosity of 22 poise (25°C) was used in the same container as in Example 1.
We conducted various tests. The results are shown in Table 1. 【table】

Claims (1)

[Claims] 1. A bolt fixing agent consisting of a container, a resin contained in the container, and a curing agent separated from the resin and contained in the container, in which the main component of the resin is acrylic urethane. A bolt fixing agent comprising a resin or an acrylic urethane resin containing a reactive monomer. 2. The bolt fixing agent according to claim 1, wherein the resin is liquid at room temperature and has a viscosity of 5000 poise (25° C.) or less. 3. A patent characterized in that the acrylic urethane resin contains one or more groups selected from the group consisting of substituted urea, allophanate, biuret, uretidinedione, isocyanurate, ester, ether, and hydrocarbon. The bolt fixing agent according to claim 1. 4. The bolt fixing agent according to claim 1, wherein the curing agent is selected from peroxides, azo compounds, metal soaps, and chelate compounds.