JPS59163490A - Water-proof reinforcing material for rubber asphalt emulsioncoating - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reinforcing material used in a waterproofing method for civil engineering and construction, particularly an asphalt waterproofing method at room temperature.
The invention is inspired by a reinforcing material for rubber asphalt emulsion vermilion waterproofing, which is made from a filament sheet mainly composed of secret water-based fibers and lipophilic fibers.

Hitherto, asphalt waterproofing and thermal methods have been used as waterproofing methods for civil engineering and construction, such as the asphalt waterproofing and thermal methods, sheet waterproofing methods, and cram school waterproofing methods.Among them, the majority of them are the asphalt waterproofing and thermal methods in terms of reliability, waterproofness, and durability. The current situation is that it depends on However, with this thermal method, the asphalt must be heated and melted at a construction site where there are many flammable materials such as paint, which poses a high risk of fire and human health, and the odor and smoke generated during heating and melting can be used in urban areas. In addition, if the asphalt's heat retention and pot life are not properly adjusted, it will become a waterproof layer with poor watertightness. There is.

Therefore, in recent years, an asphalt waterproofing room-temperature coffin construction method using rubber asphalt emulsion has been proposed and has been implemented in some areas, but since the rubber asphalt emulsion used as an adhesive contains 20 to 50% water by weight, it is difficult to bond. It has been pointed out that the agent itself is thin and has poor filling properties, and that the waterproof layer tends to swell.
There is a strong need for methods of curing rubber asphalt emulsions used as adhesives. Methods for curing such rubber asphalt emulsions include (1) physical aiding by natural drying, (2) chemical curing using a hydration reaction by mixing a hydraulic inorganic substance such as cement, and (3)
) Chemical curing by mixing water-reactive substances such as incyanate compounds, (4) Chemical curing by mixing different types of ions, (5) Neutralization and coagulation with inorganic acids and alkalis. ) law may cause a skinning phenomenon,
The drying time required is long, and the meat tends to become thin, (2)
In the method (3), the rowability deteriorates, and the hydration reaction progresses over time, increasing the aggregation of the coating film and impairing its deformability. It is difficult to apply to concrete substrates because of its poor alkali resistance, and methods (4) and (5) instantaneously gel, making it difficult to work and making the particles coarse, making it difficult to apply. They have drawbacks such as a decrease in the watertightness of the membrane, and both have inherent problems that need to be improved.

On the other hand, the coating film waterproofing method is gaining a stable position in the small area new construction and repair fields due to its ease of on-site construction and the ability to waterproof deformed roofs with complex shapes. Emulsions of rubber, acrylic rubber, chloroprene rubber thread, and rubber asphalt are used. Among these, rubber asphalt emulsions have the advantages of being inexpensive and having good adhesion to various substrates, but the curing method of the rubber asphalt emulsions is the same as that of the conventional method for asphalt waterproofing. There is a strong need for improvement.

Here, as a result of careful study to overcome the defects caused by sagging, the present inventors found that when a fiber sheet made of a specific fiber is used as a sleeve, rubber asphalt emulsion can be effectively formed. We have discovered that the fiber sheet can be cured, thereby forming a waterproof layer with excellent watertightness without causing thinning, and that the fiber sheet can significantly improve the strength of the waterproof coating layer. Completed the invention.

That is, the object of the present invention is to be able to effectively harden a rubber asphalt emulsion, thereby solidifying a high concentration rubber asphalt emulsion even on rising surfaces and ceiling surfaces,
A rubber asphalt emulsion reinforcement material for waterproofing elbows that can rapidly absorb moisture in the emulsion, rapidly harden the emulsion, exhibit fixation properties in a short time, and significantly improve the strength of the resulting waterproof coating layer. Another object of the present invention is to provide skin-like, meat-free,
To provide a reinforcing material that guarantees uniform lewdness and can easily form a thick waterproof coating layer.

Another purpose of the present defense is to form a waterproof layer that does not swell without the risk of moisture interfering with the adhesion between the paint film and the substrate, and to make a leap forward in times of fear of waterproofing the paint film due to its excellent water absorption and hardening properties. The purpose of this invention is to provide a reinforcing material that can shorten the construction period.

To achieve the object of the present invention, the rubber-asphalt emulsion-based waterproof reinforcing material for paint films according to the present invention has a 0.
Hydrophilic fiber containing 1 nmol/g or more of carboxyl groups and having a degree of neutralization of the carboxyl groups of 75% or less
．． It consists of a fiber sheet containing 5 to 80% by weight and 20% by weight or more of lipophilic fibers that have excellent affinity with rubber asphalt.

By using the fiber sheet according to the present invention as a reinforcing material for rubber-asphalt emulsion-based paint film waterproofing,
It is not clear why this effect is particularly remarkable, which is completely different from conventional technology, but when using fibers with a degree of neutralization exceeding 75%, the emulsion is hardened only by the water discharging performance of the fibers, whereas the hydrophilic By controlling the degree of neutralization of the carboxyl group of the fiber shell within the above-mentioned predetermined purity, the polished carboxyl group (-COOH) present in the fiber accelerates the coagulation of the rubber asphalt emulsion.
The water that oozes out during coagulation is simultaneously absorbed and captured by the aqueous fibers, making it possible to harden the emulsion even more effectively, and ultimately creating a skin that is firm, fleshy, and dense. It is believed that a waterproof coating layer having a uniform thickness and further improved strength properties is formed.

The present invention will be explained in detail below.

First, the hydrophilic fibers, which are essential components for forming the fiber sheet of the present invention, contain carboxyl groups of 0.1 mmol/g or more, and the degree of neutralization of the carboxyl groups is 75% or less. As long as the fiber content is preferably 10 to 70%, it is possible to collect without any limitation, the ease of making a sheet made by combining with lipophilic fibers, or the reinforcing effect of the waterproof coating layer. etc., acrylonitrile (hereinafter referred to as AN) was cross-linked to the thread fibers and 0.1 mmol
/g or more, preferably 0.3 to 4.0 mmol/g of carboxyl groups are introduced, and 75% or less of the carboxyl groups are neutralized to become alkali metal or ammonium salt type carboxyl groups, Moreover, it is preferable to use a fiber in which at least a portion of the fiber outer layer portion is made of a hydrophilic crosslinked polymer (hydrokel) and the remainder is made of an AN polymer and/or other polymer. There are no limitations on the method of manufacturing such fibers.
For example, as described in JP-A-54-138693, an aqueous alkaline hydroxide solution with a bacterial concentration of 6.0 mol/1000 g or more or 0.5 ml/
If a low concentration alkali metal water bladder aqueous solution coexisting with an electrolyte salt at a concentration of 1000 g or more is applied, the AN polymer present in at least a part of the outer layer of the fiber can be used without using any crosslinking agent. can be hydrogelated, and then the carboxyl groups in the cherry fibers are treated with acid to a predetermined degree of neutralization, or once treated with acid so that the degree of neutralization becomes 0%, and then a predetermined degree of neutralization is achieved. It can be industrially advantageously produced by neutralizing it with an aqueous solution of an alkali metal hydroxide or ammonia. In addition, for the above-mentioned AN-based double fiber, it is preferable to use a fiber consisting of a single AN-based polymer in industrial terms.
As mentioned above, as long as it contains preferably 50% or more of AN, the AN-based polymer and other polymers (for example, polyvinyl chloride, polyamide thread, polyolefin thread, polystyrene thread, cellulose thread end) It may be a composite spun fiber such as a sheath-core type, a random loss-spun type/sea-island type, a two-component laminated fiber, a Sanderuch type, or a fiber made of the above-mentioned polymer polymer.

Note that the above-mentioned hydrophilic fibers do not need to be individual fibers with a single degree of neutralization, and as long as the degree of neutralization is set within a predetermined range, two or more types of Morio fibers with different degrees of neutralization can be used. Mixed products do not depart from the scope of the present invention. By setting such a degree of neutralization in the range according to the present invention, the rubber asphalt emulsion is effectively coagulated, and the water in the emulsion is diffusely absorbed and hardened, resulting in tight physical properties. A multiple waterproof pigeon intelligence layer can be formed.

In addition, new oil-based fibers can be used as long as they have excellent compatibility with rubber asphalt.
By using a thermoadhesive composite fiber in which at least a part of the fiber surface is made up of a polymer component having a melting point of preferably 200C or less, more preferably 150C or less, bulkiness, shape retention, etc. are improved. It is possible to create a sheet, thereby improving the permeability of the rubber asphalt emulsion, and finally forming a thick and uniformly thick waterproof coating layer. Therefore, it is desirable.

Polymers for sealing such lipophilic straps include polyethylene, polypropylene, polystyrene, polyester, and polyamide, and among them, examples include those disclosed in Jibun No. 48-15684 and Bin Kosho No. 54- 44773
It is preferable to use a heat-curable flexible fiber described in Japanese Patent Publication No. 2003-100002, in which the first component is polyethylene and the second component is polypropylene.

The amount of carboxyl groups bonded and contained in the fibers, the amount of carboxyl groups contained in the fibers, and the amount of carboxyl groups contained in the fibers, the amount of carboxyl groups bound and contained in the fibers, It is determined appropriately depending on the water content in the asphalt emulsion, and it is difficult to set it uniquely, or it is generally within the range of 0.5 to 80% by weight, preferably 2 to 30% by weight. In addition, the amount of oil-visible fibers must be set at 20% by weight or more, preferably within the range of 50 to 98% by weight, and this structure improves the water absorption performance of the fiber sheet as well as the permeability of the comb asphalt emulsion or the waterproofing that is finally obtained. This is desirable because the gradual performance of the coating layer, such as strength, is comprehensively improved. It goes without saying that in addition to the above two types of fibers, other fibers such as bulb, black, rayon, polyhinyl alcohol-based, polyester thread, polyamide thread, acrylonitrile-based fiber, etc. can be mixed if desired. do not have.

The form of the above-mentioned fiber sheet may be nonwoven fabric, woven fabric, or knitted fabric, or may have a basis weight of 30 to 100 g/m2.
In order to achieve the purpose of this button-mei, dry-type non-blowable fabrics, in which joints are provided by heat-melting lipophilic spike fibers made of thermally attached composite fibers, are particularly desirable.

Such a fiber sheet is 0.5 times or more, preferably 1 to 5 times
Firefly has a water swelling degree of 0 times. If the lower limit of this range is exceeded, it is difficult to effectively cure the rubber asphalt emulsion to form a waterproof layer that does not become thin and remains water active.

The rubber asphalt emulsion to which such a fiber sheet reinforcing material can be applied is not limited in any way, but it is preferable to use a rubber asphalt solid content of 50% by weight or more, more preferably 80% by weight or more. This is desirable because the emulsion cures slowly, does not cause warping or thinning, and can form a thick waterproof coating with a small number of applications.

In addition, the properties applicable to the rubber asphalt emulsion of the fiber sheet reinforcing material include the amount of carboxyl groups in the hydrovisible material and the degree of neutralization of the carboxyl groups, the degree of water swelling of the fiber sheet reinforcing material, and the content of the rubber asphalt emulsion. It is determined as appropriate depending on the moisture content and the required strength of the waterproof coating layer.

Rubber asphalt emulsion can be effectively hardened by reinforcing the melon sheet as described above, and it is possible to harden the rubber asphalt emulsion effectively.
The distinguishing feature of the present invention is that it is possible to form a waterproof coating layer that is uniform, smooth, and has improved strength without causing swelling problems caused by moisture in the emulsion or moisture in the emulsion. This is an advantage.

In addition, due to the water absorption and curing power of such sleeves, it can be applied on risers and ceiling surfaces in the same way as on floor surfaces, and the construction period for waterproofing coatings can be significantly shortened. This is an effect of the present invention.

Next, examples of the present invention will be shown, and unless otherwise specified, all percentages and parts are based on Jubako standards.

The degree of water swelling, amount of carboxyl groups, and curing time described in the Examples were measured or calculated by the following methods.

(1) Degree of water swelling (times) Approximately 0.1 g of the test piece was immersed in pure water and kept at 25C.
After a period of time, it was wrapped in nylon cloth (200 mesh) and the water in the fiber layer was removed using a yoshishin dehydrator (32G x 30 minutes, where G is the nail blade acceleration). The weight of the sample thus prepared is measured (W1 g). Next, the spoils are dried in a vacuum transfer machine at 80C until they become sticky and the weight is measured (W1 g). Based on the above establishment results, it was calculated using the following formula. Therefore, the water swelling degree is a numerical value that indicates how many times the weight of the fiber or textile product can absorb and retain water.

(Water swelling degree) = W1-W2/W2 (2) Carboxyl-based paper (mmol/g) Approximately 1 g of a sufficiently dried sample was washed (Xg), 200 ml of water was added to it, and the mixture was heated to 50C. A 1N chlorine aqueous solution was then added to adjust the pH to 2, followed by a 0.1N caustic sorter solution and a titration curve determined using a conventional method. From the titration curve, the consumption of caustic soda aqueous solution consumed by carbotosyl group (Ycc)
I asked for From the above measurement results, it was calculated using the following formula.

(Amount of carboxyl group)=0.1Y/X Note that when polyvalent cations are included, it is necessary to determine the amount of these cations by a conventional method and correct the above formula.

(3) Curing time (minutes) Emulcoat G in a glass beaker (Nichigen Chemical
To 100 g of high-concentration rubber asphalt emulsion (solid content: 85%) manufactured by
．． After stirring and mixing while adding 3g, seal the container and leave it at a temperature of 20C for a period of time when the container will not deform even if the container is tilted (
minutes) was calculated.

Reference Example 1 Lansheets L (3d water-cloudy microfiber manufactured by Nippon Exlan Kogyo Co., Ltd., water swelling degree 150 times, -COONa base weight; 1
．． 9 mmol/g), add an aqueous solution of hydrochloric acid until the pH reaches 2 to change the carboxyl group to a plate type (-COOH), and then add a specified amount of an aqueous solution of caustic soda to a specified degree of neutralization to neutralize. Seven types of test fibers (a to g) were prepared.

The results of measuring the curing time are shown in Table 1 below.

In addition, when measuring the curing time, Table 1 also shows the results of visually determining the amount of water seeping out at the interface with the glass after one day of standing.

From the results in the above table, it can be reasoned that the hydrophilic fiber according to the present invention has excellent curing ability.

Note that if the degree of neutralization is lowered (particularly No. 1), the curing time will be shortened, but water will be removed from the bath.

Example 1 Reference Example 1, No. 10 parts of hydrophilic Fuga (However, .7d
A web of 50 g/m2 was prepared by carding 90 parts of 1 mm) and dry heat treated at 145° C. for 10 minutes to produce a nonwoven fabric (I) having a water swelling ratio of 16.

Approximately 0.3K of 15% styrene-butadiene latex diluted with water is used as a primer for rooftop mortar.
Emul coat G
The non-kitsune cloth (I) was poured and pasted while applying (1) at a rate of about 0.7 Kz/m2.

The emulsion was heated at 20° C. and 65% RH for 10 min.
After a few minutes, it solidified and the nonwoven fabric (1) was attached and fixed to the earthwork. Next, when the fixed nonwoven fabric (1) was coated with Emulcoat GQ at a rate of 2Ky/n2, the impregnation of the emulsion into the nonwoven fabric (1) was good, and after 20 minutes, it condensed to about 2Ky/n2. A rubber asphalt waterproof coating layer with a thickness of .6 mm could be formed.

The waterproof coating layer had a uniform thickness and excellent watertight filling properties, and did not cause any problem of swelling due to water in the emulsion.

Example 2 Three types of non-boar cloths (II to IV) were prepared in the same manner as in Example 1, except that the mixing ratio of the hydrophilic fibers and ES static fibers used in Example 1 was changed as shown in Table 2 below. was created.

Also, reference example 1 No. No. instead of d. Second class nonwoven fabrics (V and VI) were produced in the same manner as in Example 1, except that e and f were used and the mixing ratio was 5/95.

After coating and impregnating 18g of Emulcoat GQ on a 3cm x 20cm piece of non-woven fabric, 20C, 65%R was applied.
After curing for 24 hours under the soil condition of
) to a thickness of 0.5 mm without hardening,
Test piece F was produced without using non-tiered fabric. Furthermore, test D
and E were cured in 25 minutes and 30 minutes, respectively.

The strength and elongation of the test pieces (A to F) were measured using Instron (10±1c
Table 2 also shows the results obtained using the constant speed extension type (m/min).

From the above table, the test pieces (A and D) according to the present invention had good impregnation and curing properties of rubber asphalt emulsion, and also had mechanical properties as a waterproof layer at a level that should be met for practical purposes. It is clearly understood that this is much improved compared to the test piece (E) using hydrophilic fiber with a degree of neutralization of 100%.

On the other hand, in the test piece (B), Emalfoot GQ did not impregnate the small woven cloth, and in the test piece (G), although the impregnation was good, the nonwoven fabric had hardening performance. It was not possible to create a test piece for measurement.

Employer: Tsuyoshi Obayashi Co., Ltd. Question: Chugai Shoko Co., Ltd. Shoei Yakuhin Co., Ltd. Japan Exlan Industrial Pharmaceutical Co., Ltd. Agent: Yakuhinho Co., Ltd. Continuing from page 1 ■Applicant: Chugai Shoko Co., Ltd. Utsubo Nishi-ku, Osaka City 1-5-14 Honmachi ■Applicant Shoei Pharmaceutical Co., Ltd. 1-21 Azuchi-cho, Higashi-ku, Osaka-shi 0 Applicant Nippon Exlan Kogyo Co., Ltd. 2-2-8 Dojimahama, Kita-ku, Osaka

Claims (1)

[Claims] 1. Hydrophilic fibers containing 0.1 mmol/g or more of carboxyl groups and having a degree of neutralization of the carboxyl groups of 75% or less; lipophilic properties with excellent affinity between rubber asphalt and 0.5 to 80% by weight of hydrophilic fibers; A reinforcing material for waterproofing a rubber asphalt emulsion yarn coating film consisting of a fiber sheet containing 20% by weight or more of fibers.