JPH0441835A - Joint material for uncontinuous surface - Google Patents

Abstract

PURPOSE:To enhance the watertightness and improve the joint filling effect by using a joint material consisting in a laminate of two or more layers of a water-swelling urethane elastomer having a specific hardness and a non- swelling elastomer not including urethane elastomer having specific hardness. CONSTITUTION:Aliphatic and/or aliphatic ring type polyisocyanate is left to reaction to form a water-swelling urethane elastomer layer 1 of 5mm or more in thickness, having a hardness of 20-55 Hs-JISA, and with a water swelling magnification of 1.2 thru 4. Meantime a non-swelling elastomer layer 2 not containing urethane elastomer is formed having a hardness of 40-80 Hs-JISA made of a material selected from chloroprene, natural rubber type elastomer, etc. From these layers 1, 2, one of more each, a rectangular joint material is formed to be used over an uncontinuous surface. The joint material is applied to a surface having uncontinuity exceeding 5mm per meter, and a stable watertightness is exerted free from influence of the water quality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a joint material for uneven surfaces. More specifically, the present invention relates to a joint material for uneven surfaces, in which a water-swellable urethane elastomer layer is applied to an uneven surface with an unevenness of 5 mm or more per meter, and exhibits watertightness or an excellent joint filling effect.

[Prior Art] Conventionally, non-water-swellable rubbers and sponges have been used as joint material between two surfaces, at least one of which is an uneven surface.

However, with non-water-swellable rubbers, if the unevenness is large, large tightening is necessary, and complete watertightness cannot be expected. Sponges have good ability to follow uneven surfaces, but their watertightness deteriorates when water pressure is applied.

Also, JP-A-57-5773. Japanese Patent Publication No. 57-6107
7, JP-A-57-1351EiO, JP-A-58-185
A composite of a water-swellable rubber and a non-water-swellable rubber is known, such as in JP-A No. 2 Eil-34087.

[Problems to be Solved by the Invention] However, in the composite of these water-swellable rubbers and non-water-swellable rubbers, the water-swellable rubbers are all made by dispersing and/or partially crosslinking a water-absorbing resin in ordinary rubber. It is something that
If the unevenness is large, the water swelling rate is slow (to increase the water swelling rate, it is necessary to increase the amount of water absorbent resin and increase the water swelling ratio, and in such cases, long-term pressure resistance and elution of the water absorbent resin (remaining problems), it takes a long time to demonstrate its performance, and there is also a problem of environmental pollution due to water-absorbing resin elution into water, making it impractical.

[Means for Solving the Problems] The present inventors have conducted intensive studies to find a joint material that has good ability to follow uneven surfaces, maintains watertightness even under high water pressure, and does not pollute the environment, and has developed the present invention. reached.

That is, the present invention uses a water-swellable elastomer with a hardness of 20 to 55 Hs-JISA and a water-swellable elastomer with a hardness of 40 to 80 Hs-JISA.
A water-swellable urethane elastomer consisting of at least two layers of a non-water-swellable elastomer that does not contain a urethane elastomer can be applied to an uneven surface with an unevenness of 5 mm or more per meter, and has stable watertightness without being affected by water quality. It is a joint material for uneven surfaces (also referred to as the joint material of the present invention) that exhibits the following properties.

The water-swellable urethane elastomer in the joint material of the present invention has a hardness of 20 to 55 Hs-J I SA1, preferably 2.
It has 5-45Hs-JISA. Hardness 20Hs-J
Water-swellable urethane elastomer without ISA grooves has good ability to follow uneven surfaces, but when water pressure of about 0.1 kgf/cm or more is applied, water leaks and the hardness becomes 8.
If Hs-JISA is exceeded, the ability to follow uneven surfaces deteriorates and watertightness decreases.

The water swelling ratio of water-swellable urethane elastomer is usually 1.
It is 2 to 4 times, preferably 1.5 to 3.5 times.

If the water swelling ratio is 1.2 times, the watertightness will deteriorate as the unevenness increases, and if the water swelling ratio exceeds 4 times, the watertightness and durability under high pressure will deteriorate.

Water-swellable urethane elastomers include aliphatic and/or
Or an organic polyisocyanate component consisting of an alicyclic polyisocyanate, a polyoxyalkylene ether with an oxyethylene content of 20 to 100% by weight, and optionally an ungrooved polyoxyalkylene ether with an oxyethylene content of 20% by weight, and a chain extender. Examples include those obtained by reacting with an active hydrogen component consisting of:

Examples of aliphatic and/or alicyclic polyisocyanates include ethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, dodecamethylene diisocyanate), 2. 2. 4-trimethylhexane diisocyanate, lysine diisocyanate, 2,8-diisocyanate methyl caproate, bis(2-incyanatoethyl) fumarate, bis(
2-Isocyanatoethyl) carbonate, inphorone diisocyanate, dicyclohexylmethane diisocyanate, cyclohexylene diisocyanate, methylcyclohexylene diisocyanate, bis(2-incyanateethyl) 4-cyclohexene-1,2-dicarboxylate and/or the like. modified products (carposiimide group, uretdione group, uretdione group, urea group,
buret group and/or isocyanurate group-containing modified product).

Examples of polyoxyalkylene ethers having an oxyethylene content of 20 to 100% by weight include low-molecular polyols (ethylene glycol, propylene glycol, 1,4-butanediol, diethylene glycol, bisphenol A
1 Bisphenol S.

difunctional polyols such as cyclohexylene glycol, trifunctional or higher functional polyols such as glycerin, trimethylolpropane, pentaerythritol, sorbitol, and sucrose) and/or amines (N
- amino alcohols such as methyljetanolamine and triethanolamine; aliphatic polyamines such as ethylene diamine and diethylene triamine; alicyclic polyamines such as isophorone diamine; and heterocyclic polyamines such as aminoethyl piperazine).
EO) or EO and other alkylene oxides [3 carbon atoms
-4 alkylene oxides, such as propylene oxide (PO) and butylene oxytoco adducts. Preferred among these are adducts (random and/or block adducts) of EO and PO.

The oxyethylene content can be added if necessary.
Examples of polyoxyalkylene ethers containing 0% by weight include alkylene oxide adducts of low-molecular polyols and/or amines, or alkylene oxide adducts of polyoxyalkylene ethers containing 20 to 100% by weight of polyoxyethylene. Examples include ring polymers having an oxyethylene group content of less than 20% by weight.

If necessary, chain extenders that can be added include low-molecular polyols (ethylene glycol N, 114-butanediol, propylene glycol, butylene glycol, glycerin, trimethylolpropane, etc.), low-molecular polyamines (ethylene diamine, diethylene triamine, diethyltolylene diamine, etc.). etc.).

The water-swellable urethane elastomer may be produced by directly reacting the active hydrogen component and the organic polyisocyanate component.
A part of the active hydrogen component and an organic polyisocyanate component are reacted in advance in a conventional manner (70 to 140°C) to obtain an NCo-terminated urethane prepolymer containing 1.5 to 15% of terminal NCO groups, and such an NCo-terminated urethane prepolymer is prepared. may be reacted with the remainder of the active hydrogen component.

For the production of water-swellable urethane elastomers, catalysts (dibutyltin dilaurate, lead octylate, stannath octoate, triethylamine, triethylenediamine, etc.) are used.
, fillers (talc, bentonite, calcium carbonate,
It can be done by adding colorants (titanium white, red iron, carbon black, chrome green, etc.), ultraviolet absorbers, acid value inhibitors, plasticizers, etc.

Examples of non-water-swellable elastomers that do not contain urethane elastomers in the joint material of the present invention include chloroprene rubber, styrene-butadiene rubber, nitrile rubber, isoprene rubber, butyl rubber, and natural rubber-based elastomers.

The hardness of non-water swelling elastomer is 40-80Hs-JI
SAl is preferably 45-75Hs-JISA.

When the hardness of the non-water swellable elastomer is less than 40Hs-JISA, the strength as a support layer is insufficient and sufficient effects cannot be exhibited. Moreover, if it exceeds 80Hs-JISA, the ability to follow curved surfaces deteriorates, and workability during construction decreases.

The joint material of the present invention is a two-layer product consisting of a water-swellable urethane elastomer and a non-water-swellable elastomer, or a three-layer product with a non-water-swellable elastomer as the middle layer and water-swellable urethane elastomers on both sides. Preferably.

The joint material of the present invention may be manufactured by bonding molded products of water-swellable urethane elastomer and non-water-swellable elastomer together with an adhesive (chloroprene-based, urethane-based, epoxy-based adhesive, etc.), or by bonding them together in a mold. A multi-layered product may be produced by sequentially pouring raw materials and curing them one after another.

The cross-sectional shape of the joint material of the present invention is preferably rectangular or similar (square or with a chipped edge). The size of water-swellable urethane elastomer is usually 5 mm.
~100mm thick, 20-200mm wide, non-water swellable elastomer is usually 10-200mm thick, 20-200mm
It is the width.

The surface of the water-swellable urethane elastomer in the joint material of the present invention may be processed into an uneven surface such as embossing, if necessary.

When applying the joint material of the present invention between joints where one side is an uneven surface 1: Apply the water-swellable urethane elastomer surface to the uneven surface side. Further, if necessary, the joint material of the present invention can be applied by restraining both sides with H-shaped steel or the like. In this case H
From the end of the mold steel, water-swellable urethane elastomer is 5 to 5
It is preferable that 0 mm protrudes and the non-water swellable elastomer completely enters the H-shaped steel.

When the joint material of the present invention is applied between joints that have uneven surfaces on both sides, it has a three-layer structure with a non-water-swellable elastomer as an intermediate layer and water-swellable urethane elastomer layers on both sides. In this case, the size of the joint material is that the water-swellable urethane elastomer on both sides is usually 5 to 100 mm thick, and 20 to 20 mm thick.
200mm width, non-water swellable elastomer in the middle is usually 1
It has a thickness of 0 to 200 mm and a width of 20 to 200 mm.

When using the joint material of the present invention joined in the length direction, the thickness between the joining surfaces of the joint material is 3 to 1, with a cross-sectional area comparable to that of the joint material.
It is desirable to insert a water-swellable urethane elastomer sheet with a water swelling ratio of about 1.5 to 6 times about 0 mm.

Specific application examples of the joint material of the present invention include concrete,
The attachment of other structural members to mortar or tonal structures may be applied to locations where watertightness is required, but the present invention is not limited thereto.

In the joint material of the present invention, instead of the water-swellable urethane elastomer, a water-swellable rubber such as a normal rubber that does not have water-swellability (styrene-butadiene rubber, chloroprene rubber, butyl rubber, natural rubber, etc.) and a water-absorbing resin ( CM
When using a mixture of C, starch-acrylic acid copolymer, poval, water-swellable urethane, etc., the water absorption and water-swelling speeds decrease because the water must pass through the rubber layer before coming into contact with the water-absorbing resin. It is slow, and in cases where the concrete is uneven and the water-swellable rubber layer must be thickened, it takes too long for it to be effective, making it impractical. In addition, this product has the problem that the water-absorbing resin elutes when it comes into contact with water, which poses problems in long-term use and environmental pollution.

Furthermore, when a water-swellable urethane elastomer alone is used instead of the joint material of the present invention, the direction of water swelling cannot be restricted, so the effect of following the uneven surface is reduced, and it may deform under high water pressure and cause water leakage. Sometimes.

C Example] The present invention will be further described below with reference to Examples, but the present invention is not limited thereto.

Example 1 A non-water swellable chloroprene elastomer with a hardness of 65Hs-JISA (cross-sectional shape: 50 mm inside x 90 mm height rectangle), the following prepolymer ■ and a curing agent ■ (prepolymer NCO/curing agent OH molar ratio 1) A water-swellable urethane elastomer (cross-sectional shape: 50 mm width x f 30 mm height rectangle) with a hardness of 33Hs-JISA and a water swelling ratio of 2.45 times (mixed and molded with Bond G-17 (manufactured by Konishi) was used to obtain the joint material of the present invention.

(Prepolymer ■) A mixture of PO and EO in propylene glycol (PO/E
Average molecular weight 400 obtained by adding O (weight ratio 1/1)
0 polyether glycol 151g1 A mixture of Po and EO in propylene glycol (ff1f of PO/EO
average molecule ff1400 obtained by adding fi ratio 8/2)
0 polyether glycol 591 g, glycerin was added with PO and then EO (PO/EO
The weight ratio is 8/2) 90 g of the obtained polyether polyol with an average molecular weight of ff 13,000,! : Reacted with 168 g of isophorone diisocyanate at 120°C for 8 hours to form NGO
A urethane prepolymer (hereinafter referred to as urethane prepolymer ■) having a 4.4% content was obtained.

(Curing agent ■) Average molecular weight 6 obtained by adding PO to bisphenol A
A hardening agent (hereinafter referred to as hardening agent ①) was obtained by mixing 610 g of polyether glycol No. 00, 388 g of polyether glycol with an average molecular weight FF of 12,000 obtained by adding PO to bisphenol A, and 2 g of lead octoate.

Example 2 A non-water swellable chloroprene elastomer with a hardness of 85Hs-JISA described in Example 1 (cross-sectional shape: 30 mm width x 50 mm height rectangle), the following prepolymer ■ and diethyltolylenediamine (prepolymer NGO/diethyl hardness 48Hs-JISA, water swelling ratio 3.
3x water-swellable urethane elastomer (cross-sectional shape:
A joint material of the present invention was obtained by adhering a 30 mm width x 30 mm height rectangle with a urethane primer (GL Brimer: manufactured by Sanbe Kasei Kogyo).

(Prepolymer ■) 805 g of polyether glycol with an average molecular weight of 5500, which is obtained by adding a mixture of PO and EO (PO/EO weight ratio: 6/4) to bisphenol A, and 185 g of dicyclohexylmethane diisocyanate were heated at 120°C for 7 hours. The reaction resulted in a urethane prepolymer containing 5% N00%.

Example 3 Non-water swellable styrene-butadiene elastomer with hardness of 70Hs-JISA (cross-sectional shape: 50mm width x 90mm)
Polyether glycol with an average molecular weight of 12,000 obtained by adding a mixture of EO and PO (EO/PO weight ratio 3/7) to bisphenol A (height rectangle) and inphorone diisocyanate (N of inphorone diisocyanate)
Hardness 44Hs-JISA from GO/polyether Glyfur mixed and molded at an OH molar ratio of 1.05)
.

Water-swellable urethane elastomer with water swelling ratio of 2.8 times (
Cross-sectional shape: 50mm width x 60mm height rectangle) with chloroprene adhesive (quick-drying bond G-10: manufactured by Konishi)
The joint material of the present invention was obtained by adhering the joint material.

Example 4 After treating the upper part of butyl rubber (cross-sectional shape: 40 mm width x 50 mm height rectangle) with a hardness of 55 Hs-J I SA with a urethane primer (GL Brimer: manufactured by Sanbe Kasei Kogyo), the same procedure as in Example 1 was carried out. A mixture of the described urethane prepolymer (1) and curing agent (2) was poured and cured (cross-sectional shape: 40 mm width x 40 mm height) to obtain a joint material of the present invention.

Example 5 The non-water swellable chloroprene elastomer with hardness 85Hs-J ISA described in Example 1 was used as an intermediate layer (cross-sectional shape:
50 mm wide x 90 mm thick), and on both sides there was a water-swellable urethane elastomer made from the prepolymer (1) and curing agent (2) described in Example 1 (one side was 50 mm wide x 10 m in cross-sectional shape).
m thickness, 50 mm width x 50 mm thickness on the opposite side) were adhered with a chloroprene adhesive (quick-drying bond G-17) to obtain a joint material of the present invention.

Comparative Example 1 Chloroprene rubber with hardness eOHs-JISA (cross-sectional shape: 50 mm width x 150 mm height rectangle).

Comparative Example 2 Water-swellable urethane elastomer (cross-sectional shape:
50mm width x 150mm height rectangle) 20cm x width 12
0cm) and fixed it with bolts and nuts so that the average distance between the iron plate and the concrete uneven surface was the same as the height of the joint material, and used it as a test specimen. Thereafter, the test specimen was immersed in water, and water pressure was applied every three days to track changes in water stop pressure over time.

Table 1 Test Example 1 A 150cm x 150cm concrete block with unevenness of 22mm per 1mm (maximum unevenness of 25mm) and 15
A joint material specimen having the shape shown in Fig. 5 was placed between 0 cm x 150 cm iron plates (External dimensions 1 [Effects of the invention]) If the joint material of the present invention is used, it can be used to fill joints between surfaces with large unevenness. , large tightening is possible under high pressure without requiring force,
Complete watertightness is achieved, and there is no environmental pollution such as water pollution.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of the joint material of the present invention, Figure 3 is a cross-sectional view of the joint material of the present invention when it is sandwiched between H-shaped steel, and Figure 4 is a cross-sectional view of the joint material of the present invention that is joined. FIG. 5 is a perspective view of a joint material, and FIG. 5 is a perspective view of a specimen in a test example of the joint material of the present invention. 1... Water-swellable urethane elastomer 2... Non-water-swellable elastomer 3... H-shaped steel 4... Water-swellable urethane elastomer for joint parts Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 figure

Claims (1)

[Claims] 1. A water-swellable urethane elastomer with a hardness of 20 to 55 Hs-JISA and a hardness of 40 to 80 Hs-JISA,
A water-swellable urethane elastomer consisting of at least two layers of a non-water-swellable elastomer that does not contain a urethane elastomer can be applied to uneven surfaces with an unevenness of 5 mm or more per meter, and provides stable watertightness without being affected by water quality. demonstrate,
Joint material for uneven surfaces. 2. The joint material according to claim 1, wherein the water-swellable urethane elastomer layer has a thickness of 5 mm or more. 3. The joint material according to claim 1 or 2, wherein the water-swellable urethane elastomer is a water-swellable urethane elastomer made from aliphatic and/or alicyclic polyisocyanate, and has a water swelling ratio of 1.2 to 4 times. . 4. The non-water swellable elastomer is chloroprene rubber, styrene-butadiene rubber, nitrile rubber, isoprene rubber,
The joint material according to any one of claims 1 to 3, which is selected from the group consisting of butyl rubber and natural rubber elastomer.