JPH066825B2 - Long plate material with pre-sealing material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a pre-sealing that exhibits excellent workability, waterproofness and economical efficiency when joining substantially the actual structural portion provided at the side end of a cement-based long plate material. The present invention relates to a long plate material having a material.

2. Description of the Related Art Conventionally, a building construction method has been performed in which cement-based or gypsum-based or metal-based plate materials made from Portland cement, asbestos or the like are joined to form a wall surface. At that time, the joining of the plate materials is performed by each structure such as abutting, phase determination, and the actual body provided in the longitudinal direction of these plate materials, and usually, for waterproofing and displacement absorption, The joint is filled with an elastic sealing material.

When the side end portion of the plate material has a phase-determining structure, styrene, which is generally called hot melt, isobutylene copolymer, styrene, butadiene copolymer, synthetic resin using thermoplastic elastomer such as polyisobutylene as a base polymer. A resin composition containing as a main component is often used. However, when the joint portion of the long plate material has the actual structure, hot melt is not adopted. The reason for this is
In the case of phase determination, the hot melt intervening in the joint is clamped by the force of driving the nail into the plate, whereas in the case of this actual structure, the hot melt is After interposing it between males and males and pushing it into the females by the force of the construction worker's hand, after crimping the females and males sufficiently to ensure water tightness , One plate is nailed. This is a fairly difficult task because the impact resilience of the entire hot melt in the direction perpendicular to the length direction of the plate material, which is usually 2 to 3 m, becomes a large resistance force. In addition, cement-based plate materials have unevenness, bending, warpage, etc. in the lengthwise direction at the ends of the plate materials, and unless the male is pushed through the hot melt considerably strongly, the total length of the mating part between the plate materials However, the watertightness cannot be secured, and there is a risk of rain leaks.

Recently, in order to solve the above-mentioned drawbacks, it has been attempted to add many fine bubbles to the hot melt. However, this method requires less labor for pushing the male fruit, but has the following drawbacks and has not been put into practical use. That is, the fitting of the plate materials is usually not carried out once at a predetermined position, and the plate materials are often separated again to perform fitting again. In this case, the hot melt is crushed and deformed,
If there is a deviation from the initial position, a perfect seal cannot be made even if you try again. It is essential that the sealing material does not lose its shape restoring property ((elasticity) even in the long term. However, the current technology of hot melt is not perfect in the above points. When a hot melt containing bubbles is created by mixing gas and discharging and foaming it into the actual part of the plate material, it is discharged because of the increased heat insulation due to the bubbles and the decrease in heat capacity. In addition, the hot melt is cooled quickly on the plate material, hardly penetrates into the plate material, and the anchor effect cannot be expected. Therefore, the adhesive force to the plate material is extremely weak.

In addition, a method of using a one-component urethane resin in the case of phase-bonding has been proposed. However, since the one-component urethane resin foams and cures essentially depends on the humidity in the air, the cure is extremely slow and is not suitable for conveyor system factory production, and the foaming rate can be adjusted arbitrarily. I can't. In order to improve this point, it has been proposed to apply water to the plate material and then spray water on it, but foaming is intense on the surface and becomes extremely uneven as it rapidly weakens inward, resulting in a very uneven surface. The strength is apt to be unduly weak, and the variation in the foaming rate is large, which is not suitable for practical use. In addition, hardening here does not mean becoming hard but means that the foamed body that has been foamed into an elastic body is cured (molecularly crosslinked) to be detackified.

The present invention, as a result of various studies on the above drawbacks, is selected from the upper and lower surfaces of the male and female inner surfaces of the actual structure provided at the longitudinal side ends of the cement-based long plate material. A long plate material having a pre-sealing material obtained by applying a two-pack type foamable urethane resin solution to at least one surface of the coated plate, and then foaming and curing the same 2 to 5 times, preferably 3 to 4 times. It is intended to provide.

FIG. 1 shows an example of the phase-separated actual strip structure of the cement-based long plate material 1, which is selected from at least the upper and lower surfaces 2a and 2b of the inner side of the female seed 2 and the upper and lower surfaces 3a and 3b of the male seed 3. By providing the pre-sealing material on one surface, it becomes easy to absorb the variation in the fitting degree caused by the bending or warpage of the cement type plate material which is essentially unavoidable or the variation in the construction. The above-mentioned pre-sealing material may be provided on the inner side 2c of the female seed 2 or the tip 3c of the male seed 3, but if it is applied only here, the above-mentioned variation is not usually absorbed. Further, the variation of the fitting degree can be dealt with by setting the expansion ratio of the urethane resin used in the present invention to be sufficiently large so that the compression rate of the pre-sealing material is increased.

Cement-based board materials that are currently on the market or expected to enter the market in the future can sufficiently absorb the above variations by increasing the expansion ratio of urethane to 2 to 6 times, preferably 3 to 5 times. 6
If it is more than twice, the strength of the pre-sealing material is largely reduced, and it tends to be damaged during handling, and if it is less than twice, the absorption efficiency of variation is poor.

Further, the labor required for compression at the time of construction is much less in the present invention than in the case of hot melt. Further, since the two-pack type foamable urethane resin used in the present invention is a type in which two stock solutions are mixed, a foaming material and a curing accelerator are added to the stock solution on the polyether or polyol side which does not contain polyisocyanate. Therefore, it can be cured according to the conveyor speed at the time of factory production.

The foaming agent may be water or the like, and the curing accelerator may be a known material such as an amine-based material (for example, trade name: DABCO 33LV). Further, it is possible to keep the two stock solutions to be mixed at a constant temperature, mix them at a high speed by using, for example, a dedicated mixing injection machine, and foam and gel them in a few tens of seconds after the discharge. For this reason, it becomes possible to mass-produce a long plate material having a pre-sealing material, and it is possible to produce a factory product of uniform quality, whose foaming and curing rates are hardly affected by temperature and humidity.

Isocyanates and prepolymers that can be used in the present invention include methylene diphenyl diisocyanate (MDI),
It is a prepolymer made from tolylene diisocyanate (TDI), hexanemethylene diisocyanate (HDI), etc. and a polyol. Among them, the prepolymer made from tolylene diisocyanate is excellent because of its high tear strength. One of the liquids to be mixed with this is a polyol and is called a curing agent, but both liquids may be mixed with an anti-sagging agent, a pigment and a filler.

The adhesion between the two-component urethane foam resin and the cement-based board material is extremely good. The applied resin partially impregnates the plate material before foaming, and thus exhibits a sufficient anchoring effect and exhibits excellent adhesive force. In addition, the above-mentioned resin is less likely to deteriorate in resilience due to pressurization for a long time as compared with hot melt. This is an important advantage as a sealing material for construction.

Further, as one aspect of the present invention, in order to reduce the frictional resistance when the urethane foam material is rubbed against the cement surface of the mating real part during fitting work, oil or the like is added in advance to one or both of the two stock solutions. In addition, the two liquids are mixed, discharged, foamed, and cured, and at the same time, the added oil or the like is exuded to cover the surface of the foamed urethane resin and act as a lubricant.

Oils and the like used for this purpose are natural or synthetic oils and fats, liquid hydrocarbons, and metal salts of higher fatty acids. Many of these oils and the like are water-repellent, which also contributes to improving the waterproofness of the presealing material.

As described above, the long plate material having the pre-sealing material of the present invention has the following excellent effects.

(A) The pre-sealing material absorbs the variation in the fitting degree caused by the bending or warpage of the cement-based plate material that is essentially unavoidable or due to the variation in the construction. It will be easier.

(B) The pre-sealing material is obtained by applying a two-pack type foamable urethane resin liquid, foaming and curing it,
This two-component foamable urethane resin liquid has excellent adhesiveness with the cement-based plate material, and because it exhibits a sufficient anchoring effect by partially impregnating the plate material before foaming, and exhibits excellent adhesive strength,
The long plate material having this presealing material has excellent watertightness.

(C) Since the two-component type foamable urethane resin is a type that mixes two undiluted solutions, it is possible to add a foaming agent and a curing accelerator to the undiluted solution on the side of the polyether or polyol that does not contain polyisocyanate. It can be cured according to the conveyor speed at the time of factory production, and therefore the productivity is extremely excellent.

(D) Two-component type foamable urethane resin liquid, one or both of them, bleeds on the surface after foaming and curing, and reduces frictional resistance between the cement hardened product and urethane foam, natural or synthetic Contains lubricants such as oils and fats, liquid hydrocarbons, metal salts of higher fatty acids, etc., both undiluted solutions are mixed, discharged and foamed and hardened, and the contained lubricant exudes and covers the surface of the foamed urethane resin. From
The pre-sealing material, which greatly reduces the frictional resistance when it is rubbed by the cement surface of the mating part during the fitting operation, is a material having excellent workability and waterproofness.

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples.

Example 1 A prepolymer having an isocyanate group at the molecular end, which was produced by the reaction of tolylene diisocyanate (TDI) and diethylene glycol [HO (C ₂ H ₄ OC ₂ H ₄ ) OH], was used as solution A, Propine oxide, ethylene oxide copolymer [HO (CHCH ₃ · CH ₂ O) _m (C ₂ H ₄ O) OH: molecular weight about 1
000] to an amine-based reaction accelerator (for example, trade name Dabco 3
3 LV) and water respectively 1% to the total after mixing
And that added so as to be 2% are referred to as solution B. These liquids A and B are put in a dedicated mixer (for example, Model F-200 manufactured by Tuba Co.) so that the mixing ratio of both liquids is 1: 1 in terms of the equivalent ratio of isocyanate groups and hydroxyl groups. While running this on the conveyor to the lower surface of the female inside of the actual structure of 15 mm thick cement asbestos board width 6 mm,
Apply in a line with a height of 3 mm. Foaming starts at 25 ° C at room temperature in 25 seconds, finishes in about 40 seconds and hardens once, and at that time, it is possible to wrap the plate material, and even after 2 hours of hardening, it can be used for construction. It was The foaming ratio of this pre-sealing material was about 4 times. A wall surface was made by applying this plate material, but the workability was excellent. The watertightness was investigated by pouring tap water into it, but no water leaked to the back surface.

Example 2 Liquid B in Example 1 was mixed with 2 parts of liquid paraffin (liquid hydrocarbon).
%, A plate material was manufactured in exactly the same manner as in Example 1 except that the content was added. When this plate material was used for construction after 2.5 hours,
The fitting was done smoothly during fitting work, and workability was extremely good.
The fluid paraffin was also attached to the male by the fitting of the plates, and the water repellency further improved the waterproof property.

Comparative Example 1 A commercially available one-pack type urethane resin is used as a cement having an engaging portion of the actual structure, and the inner bottom surface of the female seed of the asbestos board is 5 mm wide and 3 high.
It was applied in a linear shape of mm. The room temperature was 25 ° C. and the humidity was 75%. After a few hours, the surface was in a skinned state, but the urethane resin spread on the cement asbestos board material and was sucked in, so that the height became 1.7 mm and the width became 9 mm. After several days, it was in a cured state, but the expansion ratio during this period was less than 2 times, a sufficient compression ratio could not be obtained when fitted, and it was not possible to cover the large variation in the fitting part gap, so that it would meet the actual requirements. I couldn't do it.

Comparative Example 2 A listed in Example 1 in place of the commercially available one-component urethane resin
When the liquid was used, the result was almost the same as in Comparative Example 1.

As described above, the long plate material having the pre-sealing material of the present invention has the following excellent effects.

(A) The pre-sealing material absorbs the variation in the fitting degree caused by the bending or warpage of the cement-based plate material that is essentially unavoidable or due to the variation in the construction. It will be easier.

(B) The pre-sealing material is obtained by applying a two-pack type foamable urethane resin liquid, foaming and curing it,
This two-component foamable urethane resin liquid has excellent adhesiveness with the cement-based plate material, and because it exhibits a sufficient anchoring effect by partially impregnating the plate material before foaming, and exhibits excellent adhesive strength,
The long plate material of the present invention having this presealing material has excellent watertightness.

(C) Since the two-part type foamable urethane resin is a type that mixes two undiluted solutions, it is possible to add a foaming agent and a curing accelerator to the undiluted solution on the side of polyether and polyol that does not contain polyisocyanate. It can be cured according to the conveyor speed at the time of factory production, and therefore the productivity is extremely excellent.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a phase-shifting actual strip structure of a cement board, and FIG. 2 is a perspective view showing an example of the present actual strip structure.

Claims (2)

[Claims] 1. An inner upper and lower surface of a female fruit and an upper and lower surface of a male fruit of a real fruit-like structure or a phase-resolved fruit-like structure provided at a side end portion along a longitudinal direction of a cement-based long plate material. The two-component foamable urethane resin liquid has been applied to at least one surface, foamed, and cured, and furthermore, one or both of the two-component foamable urethane resin liquid has been foamed and cured. A long plate material having a pre-sealing material containing a lubricant that oozes out to the rear surface and reduces the frictional resistance between the cement hardened body and the urethane foam. 2. A length having a pre-sealing material according to claim 1, wherein the lubricant is at least one selected from natural or synthetic oils and fats, liquid hydrocarbons, and metal salts of higher fatty acids. Scale plate material.