JPH0832750B2 - Adhesive composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to an adhesive composition that is preferably used for fixing anchor bolts to concrete structures, rocks, and the like.

(Prior art) To fix an anchor bolt to a concrete structure, rock, etc., make a hole in the concrete structure, rock, etc., put an adhesive, and rotate the anchor bolt to insert it.
A method of curing the adhesive has been adopted.

The adhesive used in such a method is required to be inexpensive, high in strength, good in storage stability and short in curing time, and unsaturated polyester resin-based adhesives are generally used. As such an adhesive, a main agent containing a tertiary amine curing accelerator in an unsaturated polyester resin,
A two-pack type adhesive composition comprising a curing agent containing an organic peroxide as a main component is used.

(Problems to be Solved by the Invention) However, the above-mentioned adhesive composition has a problem that the curing time is short, but the storage stability of the main component is not sufficient, and gelation occurs and the composition cannot be stored for a long time. The unsaturated polyester resin usually contains a polymerization inhibitor such as hydroquinone, and if the content of the polymerization inhibitor is increased in order to improve the storage stability, the curing time becomes long and there is a problem.

The present invention solves the above problems, and an object of the present invention is to provide an adhesive composition having excellent storage stability without prolonging the curing time.

(Means for Solving the Problems) The adhesive composition of the present invention contains an unsaturated polyester resin as a main component containing a tertiary amine curing accelerator and tin naphthenate, and an organic peroxide as a main component. Consisting of a curing agent,
Thereby, the above-mentioned object is achieved.

Examples of the unsaturated polyester resin used in the present invention include unsaturated dibasic acids such as maleic anhydride and saturated dibasic acids such as phthalic anhydride, and glycols such as ethylene glycol and propylene glycol. There is a liquid resin in which a resin obtained by condensation is dissolved in a polymerizable monomer such as styrene.

Examples of the tertiary amine curing accelerator contained in the unsaturated polyester resin include dimethylaniline and diethylaniline. Such a tertiary amine curing accelerator is generally used for 100 parts by weight of the unsaturated polyester resin.
It is preferably contained in the range of 0.1 to 2.0 parts by weight. If the amount is more than 2 parts by weight, the curing time will be short, but the storage stability will not be sufficient. On the contrary, if the amount is less than 0.1 part by weight, the storage stability is improved, but the curing time becomes long.

Further, the amount of tin naphthenate contained in the unsaturated polyester resin is not particularly limited, but it is determined by the balance between its effect and economy. Considering this point, the content of tin naphthenate is preferably 10% of unsaturated polyester resin.
0.1-5 parts by weight, more preferably 0.05-
2 parts by weight. If it is less than 0.01 parts by weight, the effect of improving the storage stability is small, and if it is more than 5 parts by weight, the effect of improving the storage stability is large, but the cost of the composition becomes expensive.
Further, the curing time tends to be slightly longer.

Thus, the main component is composed of an unsaturated polyester resin containing an appropriate amount of a tertiary amine curing accelerator and tin naphthenate, and if necessary, aggregates such as crushed stone and calcium carbonate and fillers May be blended in an appropriate amount.

Examples of the curing agent containing an organic peroxide as a main component used in the present invention include a curing agent containing benzoyl peroxide, decanoyl peroxide, etc. as a main component. Such a curing agent is generally used in the range of 5 to 30 parts by weight with respect to 100 parts by weight of the main agent. The above organic peroxide is usually used after diluting it with calcium sulfate (gypsum powder), dioctyl phthalate (plasticizer) or the like.

The adhesive composition of the present invention is usually stored in a container having a double structure in which the main agent and the curing agent are composed of a glass tube or a synthetic resin tube, separately filled so that the main agent and the curing agent do not mix. To be done. Then, at the time of use, for example, the container is inserted as it is into a hole provided in a concrete structure or bedrock, and an anchor bolt is rotationally inserted into this to crush the container and mix the main agent and the curing agent, and then the adhesive. Is cured and the anchor bolts are fixed. However, it can also be used for various applications in which the main component and the curing agent are mixed and adhered after being taken out from the container during use.

(Function) In the adhesive composition of the present invention, when the unsaturated polyester resin contains a tertiary amine-based curing accelerator and tin naphthenate to form the main component, the above-mentioned main component is compared to the main component containing no tin naphthenate. The gelation of is less likely to occur. Moreover, this tin naphthenate does not suppress the curing reaction of the base compound by the curing agent containing organic peroxide as the main component.

(Example) Hereinafter, the Example and comparative example of this invention are shown.

Example 1 A base compound was prepared by uniformly mixing 100 parts by weight of an unsaturated polyester resin (Goselac 80S: manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), 1.0 part by weight of dimethylaniline and 0.1 part by weight of tin naphthenate (manufactured by Sansha Machinery). In order to evaluate the storage stability of this main agent, the time until gel formation at 80 ° C. and 120 ° C. was measured. The gelation time at 80 ° C. was measured visually and by touch to the hand, and the gelation time at 120 ° C. was measured by the rotating torque method.

In addition, 10 g of the above-mentioned base compound was uniformly mixed with 2.0 g of a curing agent prepared by diluting benzoyl peroxide to 30% by weight with calcium sulfate (corresponding to 6.0 parts by weight of benzoyl peroxide with respect to 100 parts by weight of unsaturated polyester resin). Then, an adhesive was prepared.
The curing time of this adhesive was measured at 20 ° C. The curing time was the time until the temperature in the mixing system reached the maximum.

In addition, crushed stone (size adjusted to 2 to 4 mm) in 4 g of the above main agent 8
A uniform mixture of g, outer diameter 13 mm, wall thickness 0.7 mm, length
Fill an 85 mm glass tube (outer tube) with a glass tube (inner tube) pre-filled with 0.8 g of the above-mentioned curing agent, put a synthetic resin stopper on the opening of the tube, and apply an adhesive composition. The thing was prepared.

With this adhesive composition being filled in a glass tube, a diameter of 15 m provided in a concrete block with a compressive strength of 240 kg / cm ²
m, depth 105mm, insert into this, diameter 12mm, length 150m
Rotate and agitate all the screw bolts of m with a hammer drill, and set while crushing the glass tube, -5 ℃ × 3 hours, -5 ℃ × 24
The adhesive strength of a cured product that had been cured under the conditions of 23 ° C. for 6 months was measured. The bond strength is indicated by the maximum pulling force by the hydraulic jack under the same temperature conditions as above.
This was measured three times.

 The above results are summarized in Table 1.

Examples 2 to 6 and Comparative Examples 1 to 3 A base resin, a curing agent and an adhesive composition were prepared in the same manner as in Example 1 except that the composition of the adhesive was changed as shown in Table 1. The curing time, curing time and fixing strength were measured. The results are summarized in Table 1. Comparative Examples 2 and 3 show that compounds similar to tin naphthenate are ineffective.

(Effects of the Invention) As described above, the adhesive composition of the present invention contains an unsaturated polyester resin as a main component containing a tertiary amine curing accelerator and tin naphthenate, and an organic peroxide as a main component. Comparing with the conventional adhesive composition of this kind, which consists of a curing agent and does not contain tin naphthenate, it has excellent storage stability without a long curing time, good workability in construction, and no decrease in adhesive strength. .

Therefore, the adhesive composition of the present invention is often used to store the adhesive composition for a long period of time, and further, an application requiring prompt construction work, for example, for fixing an anchor bolt to a concrete structure or rock mass. It is suitable for use as an adhesive.

Claims (1)

[Claims] 1. An adhesive composition comprising an unsaturated polyester resin, a main agent containing a tertiary amine curing accelerator and tin naphthenate, and a curing agent containing an organic peroxide as a main component.