JPS61185580A - Joint sealing material for connecting part of concrete and pipe - Google Patents

Abstract

PURPOSE:The titled sealing material useful for joints of connecting part of Hume concrete pipe, etc., having a proper pot life, improved water stopping properties, durability, etc., obtained by blending exoxyurethane resin with epoxy resin and an amine curing agent in a fixed ratio. CONSTITUTION:(A) 100pts.wt. resin component containing (i) 20-80pts.wt. epoxyurethane resin and (ii) 80-20pts.wt. epoxy resin is blended with (B) 10-100 pts.wt. amine curing agent (e.g., dimer acid amide polyamine), to give the aimed sealing material.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a joint sealing material for use in concrete pipe joints. More specifically, the present invention provides a method for sealing by injecting into the gap created between adjacent concrete pipes when joining concrete pipes in a box culvert or humid pipe press-in propulsion method.
A joint sealing material with excellent elasticity, adhesiveness, water-stopping properties, and durability that will not peel or crack even if it is slightly bent or misaligned due to ground movement or the load of passing vehicles. It is related to.

Conventional technology Conventionally, in the box culvert and humid pipe press-in promotion methods used in sewage pipe construction and other underground pipe burying works, cement is added to the joints of adjacent concrete pipes for water stoppage and adhesion. The main component is cement mortar mixed with waterproofing agent and coagulant.

However, the gap between the joints is usually 0.5 to 0.
711M, and the depth is about 3 to 10 meters, so it is very difficult to completely apply cement mortar to the entrance and rising parts, and in many cases, the effect is insufficient. cannot be avoided. Moreover, even if it is completely coated, the cured product lacks adhesiveness and elasticity, so vibrations from passing vehicles such as large trucks and ground movement can cause it to crack or peel, causing water leakage. .

In particular, in sewage fume pipes, the joints are usually 2.
Every 430 ff requires a sealing material with perfect reeds, water-stopping, and adhesion, as well as excellent durability. This means that if sewage water from the sewage pipe flows out from the joint, it will not pollute the groundwater, and if rainwater from outside flows into the sewage pipe, the amount of sewage will reach the sewage treatment plant. This is because it may exceed the capacity and become impossible to process. The same can be said about box culverts for rainwater treatment.

In this way, it is important to completely seal the joints of box culverts and humid pipes in order to stop water and make them waterproof, but the conventional method of applying cement mortar is as follows. For some reason, this is not a completely satisfactory method.

Problems to be Solved by the Invention Under these circumstances, the object of the present invention is to provide a method that can be easily injected into the joint joints of box culverts, humid pipes, etc., and that the cured product has elasticity and adhesive properties. properties, water resistance,
To provide a resin composition for sealing a joint which is excellent in durability, provides perfect waterproofing and adhesion of the joint, and can be applied even when the joint is wet.

Means for Solving the Problems As a result of extensive research, the present inventors discovered that a composition containing a specific epoxy resin and a curing agent was suitable for the above purpose, and based on this knowledge, As a result, the present invention was completed.

That is, the present invention provides (A) epoxy urethane resin 20
For concrete pipe joints made of a fluid resin composition containing 10 to 100 parts by weight of an amine curing agent component to 100 parts by weight of a resin component containing ~80% by weight and 80 to 20% by weight of an epoxy resin. It provides a joint sealing material.

In the sealing material of the present invention, the resin component used as the gradient component is a mixture of 20 to 80% by weight of epoxy urethane resin and 80 to 20% by weight of epoxy resin.

This epoxy urethane resin is a urethane resin having an epoxy group at the end of the molecule, and such resins are known and commercially available. The component (c) of the present invention is:
Those containing ether bonds, hydroxyl groups, amine groups, etc. in addition to urethane bonds in the molecule can also be used.

When this material is cured using, for example, an amine non-curing agent, a cured product with excellent flexibility, elasticity, adhesiveness, water resistance, chemical resistance, etc. is obtained. Such an epoxy urethane resin can be obtained, for example, by reacting polyor-no with an isocyanate such as TD or MD to produce a urethane prepolymer, and then epoxidizing the terminal hydroxyl groups.

A typical example of such a compound is epoxyurethane E-195 (manufactured by Dainippon Ink Chemical Co., Ltd., trade name).
can be mentioned.

Next, the epoxy resins used in combination with this include, for example, epoxy resins derived from phenols such as bisphenol A1 novolak, polyphenol, and polyhydroxybenzene, and epoxy resins derived from aromatic carboxylic acids such as oxycarboxylic acids and aromatic dicarboxylic acids. epoxy resin,
Vinyl polymer epoxy resins, epoxy resins derived from alicyclic compounds such as cyclohexene and dicyclopentadiene, nitrogen-containing epoxy resins, nitrogen-containing heterocyclic epoxy resins, metal-containing epoxy resins, asphalt epoxy resins (especially (see Japanese Patent Publication No. 52-19852), colored picumene epoxy resin (see Japanese Patent Publication No. 52-3738), and the like. Among these, particularly preferred are bisphenol A-based epoxy resins, asphalt epoxy resins, and colored bitumen epoxy resins, which are liquid at room temperature.

In the present invention, it is necessary to use one in which the content of the epoxy urethane resin is in the range of 20 to 80% by weight based on the total amount of resin components.

If this amount is less than 20% by weight, the elasticity and adhesiveness of the cured product will decrease, and if it exceeds 80% by weight, the bending strength, flexural modulus, compressive strength, and tensile shear strength (adhesion strength) of the cured product will decrease. etc. will decrease. A preferable content ratio of the epoxy urethane resin is in the range of 60 to 70% by weight based on the total amount of resin components.

In the composition of the present invention, (as the curing agent used as a homogeneous component, an amine curing agent is used that cures component (A) at room temperature and provides an appropriate pot life.

Examples of such substances include naphthenic acid amide polyamines obtained by condensing naphthenic acid with alkyl diamines, and cyclic carboxylic acid amide polyamines obtained by condensing alkylene diamines with cyclic dimers of higher unsaturated fatty acids. However, dimer acid amide polyamine, which is a condensation product of linoleic acid dimer and ethylene diamine, and is represented by the formula % is particularly suitable as a substance that improves the curing characteristics of the composition and the physical properties of the obtained cured product. It is. Regarding the blending ratio of this curing agent, (A) component 1
00 parts by weight and 10 to 100 parts by weight.

The composition of the present invention needs to have fluidity so that it can be injected into desired joints using a pressure injection machine. To this end, a composition with appropriate fluidity can be prepared by appropriately selecting and combining the types of each component, and if necessary, within a range that does not impair the purpose of the present invention. ,
The fluidity can also be adjusted by adding a reactive diluent such as lc.

The composition of the present invention may contain resins other than epoxy resins as long as the object of the present invention is not impaired, and fillers such as metal oxides and metal hydroxides may be added as desired. , metal salts, carbon, metal powder, precipitated calcium carbonate, heavy calcium carbonate, hydrated silicic acid, anhydrous silicic acid, aluminum silicate, talc, magnesium oxide,
Silica sand etc. can be mixed.

The composition of the present invention is prepared by blending an epoxy urethane resin and an epoxy resin in a predetermined ratio, and then mixing them uniformly at room temperature or by heating. It is obtained by blending photonic agents and reactive diluents and mixing them uniformly.

Effects of the Invention The joint sealing material of the present invention thus obtained has a suitable pot life and can be easily and satisfactorily used to join box culverts, humid pipes, etc. using a manual or electric pressure injection machine. Can be injected into joints. The injected composition cures at room temperature or by heating if necessary, and the cured product has excellent elasticity, adhesiveness, water-stopping properties, and durability, so it is effective for water-stopping and adhesion of the joint. It also has good durability because it does not crack or peel off due to vibrations from passing vehicles. Furthermore, the use of the sealing material of the present invention has the advantage that sealing can be performed even if the joint is wet.

Example Next, the present invention will be explained in more detail with reference to Examples.

The types of each component used are shown below.

Bisphenol A epoxy resin: x ? '=r −
) 828 (manufactured by Shell Chemical Co., Ltd.) Asphalt epoxy resin: L-707 (Special Publication No. 5
2-19852 publication example) Colored bitumen epoxy resin: CL-7Q7 (Japanese Patent Publication No. 52-5758 publication example) Epoxy urethane resin: E-195 (manufactured by Dainippon Ink Chemical Co., Ltd.) Dimer acid amide polyamine: Q, - 651 (manufactured by Mitsui Epoxy Co., Ltd.) Example 1 80 g of bisphenol A-based epoxy resin and 20 g of epoxy urethane resin were heated to 100°C, thoroughly stirred and mixed, then cooled, and dimer acid amide polyamine 61.9 was uniformly added thereto. A sealing material was prepared by blending. This sealing material was injected into the joint joint of the fume tube and heated to 25°C.
After curing for 7 days, a perfect seal was formed. The physical properties after curing are shown in the table.

Example 2 60 fl of bisphenol A-based resin and 40.9 g of epoxy urethane resin were heated and mixed at 130°C, further stirred at this temperature for 30 minutes, cooled, and 49 g of dimer acid amide polyamine was uniformly blended to form a sealing material. was prepared and cured in the same manner as in Example 1. The physical properties of the cured product are shown in the table.

Example 3 40 g of bisphenol A-based epoxy resin and 60 J of epoxy urethane resin were heated and mixed at 150°C, further stirred at this temperature for 30 minutes, cooled, and 37.9 g of dimer acid amide polyamine was uniformly blended and sealed. A material was prepared and cured as in Example 1. The physical properties of the cured product are shown in the table.

Example 4 Bisphenol A-based epoxy resin 20. Iil and epoxy urethane resin 801 were heated and mixed at 165°C, stirred at this temperature for 30 minutes, cooled, and further mixed with this mixture evenly with 25 g of dimer acid amide polyamine to prepare a sealing material. and cured. The physical properties of the cured product are shown in the attached table.

Example 5 Asphalt epoxy resin 75. lit and epoxy urethane resin 25.9 were uniformly mixed at 165° C., cooled, and further mixed with dimer acid amide polyamine 589 to prepare a sealing material, and cured in the same manner as in Example 1. The physical properties of the cured product are shown in the table.

Example 6 Colored bitumen epoxy resin 5011 and 50 g of epoxy urethane resin were heated to 170°C, mixed uniformly, cooled, and dimer acid amide polyamine 43J was uniformly mixed to form a sealing material. Prepare
It was cured in the same manner as in Example 1.

The physical properties of the cured product are shown in the table.

Comparative Example 1 A composition was prepared by uniformly mixing 61 g of dimer acid amide polyamine with bisphenol A-based epoxy resin 100I, and cured in the same manner as in Example 1. The physical properties of the cured product are shown in the table.

Comparative Example 2 A composition was prepared by uniformly mixing 13 g of dimer acid amide polyamine with epoxy urethane resin 100I, and cured in the same manner as in Example 1. The physical properties of the cured product are shown in the table.

As can be seen from this table, the cured product obtained from the composition of the present invention has overall good physical properties such as elasticity, adhesiveness, and various strengths, and is particularly excellent in tear strength. I understand.

Claims (1)

[Scope of Claims] 1 (A) 10 to 100 parts by weight of an amine curing agent component to 100 parts by weight of a resin component containing 20 to 80% by weight of an epoxy urethane resin and 80 to 20% by weight of an epoxy resin. Joint sealing material for concrete pipe joints made of a fluid resin composition containing 2. The joint sealing material according to claim 1, wherein the amine curing agent component is a dimer acid amide polyamine.