JPS5930545B2 - composite sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite sheet suitable for composite waterproofing methods.

Conventionally, the waterproofing method for concrete subsurfaces such as roofs, balconies, indoors, etc. is to apply a primer to the subsurface, then apply a primer coat waterproofing material, and in some cases, use glass cloth, non-woven fabric, or vulcanized rubber. A coating film waterproofing method is known in which a reinforcing material such as is laminated, a top coat waterproofing material is applied with two layers, and finally a finishing paint is applied.

This conventionally known waterproofing method is easy to apply, but since the base and the paint film are strongly bonded (・), if the base cracks, expands, or contracts, the stress is applied directly to the paint film. However, it has the disadvantage that cracks occur in the coating film, causing water leakage.

Therefore, in order to improve the drawbacks of the above-mentioned coating film waterproofing method, a primer is applied to the underlying surface, and then a base material layer and an asphalt composition layer are laminated over the entire surface.
And part of the base material layer is impregnated with the asphalt composition (・
The applicant proposed a composite waterproofing method in which a waterproof sheet is pasted so that the asphalt composition layer is in contact with the primer-coated surface, and then a coating film waterproofing material is applied thereon. -10731).

The waterproof sheets used in the above composite waterproofing method have high tensile strength and tear strength (・The base material layer is easily deformed (・Since the rubber asphalt composition layer is laminated, there is no possibility of cracks in the base layer). To provide a waterproof layer with excellent waterproof performance without causing cracks in the coating layer even if it undergoes expansion or contraction.

However, when the waterproof sheet is applied to a primer coated surface of a concrete base that has not dried sufficiently, the water contained in the concrete base evaporates after construction and the waterproof layer peels off, causing blistering in the waterproof layer. One of the disadvantages is that cracks occur in the waterproof layer and the waterproof layer does not perform its waterproof function. Therefore, the above-mentioned waterproof sheet is pasted on the primer-coated surface of the concrete base. difference(
・The underlying concrete had to be dried, and waterproofing took a long time. The inventors completed this invention as a result of research aimed at improving the drawbacks of the above-mentioned waterproof sheets.

In this invention, a base material having voids communicating with one side of the rubber asphalt composition layer is laminated with a film bonded to the base material, and the other side of the rubber asphalt composition layer is protected. It relates to a composite sheet in which materials are laminated.

In this invention, the rubber asphalt composition includes:
Anything is fine as long as it is mainly composed of rubber and asphalt, but especially 100 parts by weight of asphalt and 1 part of rubber substance.
0 to 40 parts by weight of sulfur, 1 to 15 parts by weight of thermoplastic resin, and 30 to 70 parts by weight of inorganic filler are further added and mixed with 0.03 to 0.25 parts by weight of sulfur.
A rubber asphalt composition obtained by heating at 20 to 200°C for 1 to 5 hours can be suitably used. As the asphalt of the rubber asphalt composition, it is possible to use what is generally called asphalt, for example naturally occurring ones such as natural asphalt and asphaltite, as well as petroleum asphalts such as straight asphalt, prone asphalt and cutback asphalt.

It is also possible to use mixtures of the abovementioned asphalts. The rubber substance of the rubber asphalt composition includes natural rubber, synthetic rubber, such as polybutadiene, polyisoprene, styrene-butadiene copolymer rubber, and styrene-butadiene block copolymer called S-B-S type thermoplastic elastomer. , chloroprene rubber, isoprene-isobutylene copolymer rubber, ethylene-propylene copolymer rubber, etc. can be used.

Thermoplastic resins for the rubber asphalt composition include ethylene polymer, ethylene monovinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, polypropylene, polybutene-1, poly-4- Use of methylbenzene-1, polystyrene, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, A-B-A type styrene-butadiene block copolymer, polyvinyl chloride, polyacrylonitrile, etc. I can do it.

Inorganic fillers for the rubber asphalt composition include particulate inorganic fillers such as calcium carbonate, magnesium silicate, anhydrous silicic acid, calcium silicate, aluminum silicate, clay, and carbon black, and fibers such as asbestos and glass fiber. Inorganic fillers can be used. As the sulfur in the rubber asphalt composition, any sulfur that is generally used in rubber vulcanization can be used.

The rubber asphalt composition includes asphalt, a rubber substance,
In addition to thermoplastic resins, inorganic fillers, and sulfur, organic compounding agents commonly used in rubber compounding, such as process oil, petrolatum, ceresin, petroleum resins, and petroleum softeners such as low-molecular-weight polyethylene, low-molecular-weight polypropylene, and low-molecular-weight polybutadiene , fatty oil-based softeners such as stearic acid, lauric acid, ricinoleic acid, and palmitic acid, various plasticizers, and fibrous materials of thermoplastic resins such as polypropylene, polyethylene, and polystyrene may also be added and mixed. In this invention, the base material laminated on the rubber asphalt composition layer via a film may be a woven fabric, nonwoven fabric, felt or paper made of organic or inorganic fibers as long as it has continuous voids.・
Can be used with any deviation.

For example, as a base material having continuous voids, a woven fabric or nonwoven fabric made of fibers such as asbestos, polyolefin, polyamide, polyester, polyvinyl alcohol, or wool, or paper such as felt or kraft paper can be used. In particular, polyester, polypropylene, or polyvinyl alcohol synthetic fibers having a basis weight of 20 to 200 f7/M2, especially 50 to 1507/M2, and a thickness of 0.1 to 5 mm are used as base materials having continuous voids. Non-woven fabrics and kraft papers made of such materials can be suitably used.As the temperature film in this invention, films made of known synthetic resins such as polyester, polyvinyl chloride, polyethylene and the like can be used.

The thickness of the film is usually 10-300μ. The film may be bonded to one side of the base material by heat fusion at °C, or may be bonded to one side of the base material using a bonding agent.

As a bonding agent, rubber latex such as styrene-butadiene copolymer latex, synthetic resin emulsion such as polyvinyl acetate emulsion, or heat-melting material such as polyethylene, polypropylene, polyvinyl chloride, or ethylene monovinyl acetate copolymer can be used. Adhesive is used. In this invention, the protective material at °C may be any material as long as it is effective in protecting the rubber asphalt composition layer and preventing contamination by the rubber asphalt composition at °C when handling composite sheets, such as asbestos. , polyolefins, polyamides, polyesters, polyvinyl alcohols, wool, etc. Woven fabrics, nonwoven fabrics, felts, paper made of inorganic or organic fibers, films bonded to these, and plastic sheets. Can be used even at different temperatures. In particular, as a protective material, composite sheets made of woven fabric, non-woven fabric, felt, paper, etc. with a film bonded to them are used for waterproof construction.
・℃・o This invention will be explained using FIG. 1, which is a sectional view of an embodiment of the composite sheet of the present invention. The base material 3 having a void communicating with one side of the rubber asphalt composition layer 2 preferably having a thickness of 0.4 to 3 ml is the base material 3.
A protective material 5 in which a film 6 is bonded to a nonwoven fabric 7 is further laminated on the other surface of the rubber asphalt composition layer 2. In this invention, it is important that a base material having voids communicating with one side of the rubber asphalt composition layer is laminated via a film bonded to the base material.

If only the base material is laminated directly on the rubber asphalt composition layer, then when this composite sheet is used to waterproof a concrete base that has not dried sufficiently, the organic solvent in the primer will dissolve the rubber asphalt composition. Since the dissolved rubber asphalt composition fills the voids in the base material, water vapor generated by vaporization of water in the base concrete cannot escape through the voids in the base material, causing blistering in the waterproof layer. Preferably (・o) The composite sheet of this invention is
A base material having interconnected voids to which the film is bonded, a protective material, and a rubber asphalt composition are prepared by a method known per se,
For example, by a method of laminating the base material, release paper, and rubber asphalt composition for 0.1 to 10 seconds at 150 to 160°C using a lamination roll, After that, the release paper is peeled off from the obtained sheet, and the rubber asphalt composition layer and the protective material of this sheet are laminated together using a roll. and the rubber asphalt composition layer using a roll (・
It can be obtained by a method of superimposing.

When waterproofing is carried out using the composite sheet of this invention, a primer is applied to the concrete base, and before the applied primer is visible, the composite sheet of this invention is inserted into the open spaces where the film is bonded. It is preferable to attach a base material having a primer so that it is in contact with the primer-coated surface, and then apply a coating film waterproofing material thereon at ℃. A primer, a rubber-based primer or a thermoplastic synthetic resin-based primer can be used.

Asphalt-based primers include asphalt or rubber-mixed asphalt; rubber-based primers include rubbers such as chloroprene rubber and butyl rubber; and thermoplastic synthetic resin-based primers include thermoplastic resins such as acrylic resin and vinyl acetate resin. Examples include those dissolved in organic solvents. The coating film waterproofing materials include synthetic rubber coating coating waterproofing materials such as polyurethane, styrene-butadiene copolymer rubber, silicone, and polysulfide, as well as epoxy resins, unsaturated polyesters, polyacrylic esters, and polyvinyl acetate. Synthetic resin coating film waterproofing materials such as the following can be used. These coating film waterproofing materials can be applied by a method known per se. For example, the composite sheet of the present invention is coated with an undercoat and a topcoat, and if necessary, a final finish such as silver paint or color paint is applied. A method of applying paint can be adopted. When the composite sheet of this invention is used, even if it is applied to a concrete base with a high moisture content, the film bonded to the base material will keep the voids in the base material stable for a long time, so the moisture content in the concrete base will remain stable for a long time. The water vapor generated by the evaporation escapes to the outside through the continuous voids in the base material, so that blistering does not occur in the waterproof layer. Therefore, when the composite sheet of this invention is used, the water vapor generated after concrete is poured escapes. Since the concrete base surface can be constructed by curing for a short period of time until it dries, the total construction period can be shortened.

Furthermore, by using the composite sheet of the present invention, it is possible to obtain a waterproof layer that can be easily constructed on-site and has an excellent heat insulating effect.

Examples, comparative examples, and reference examples are shown below.

In the following description, parts indicate parts by weight. Example 1 Width is 1m and thickness is 0.4w! m, polyester nonwoven fabric with a basis weight of 807/i (manufactured by Toyobo Co., Ltd., product name L)
A polyester nonwoven fabric having the polyethylene film bonded thereto was prepared by bonding a polyethylene film having a thickness of 30 μm to the AE-4082E) by heat fusion.

On the other hand, a rubber asphalt composition was prepared as follows. A mixture of 33 parts of prone asphalt and 155 parts of straight asphalt, 37 parts of process oil (trade name ESSOH-1) and 20 parts of polyethylene
00 capacity beaker, heated to 160°C, stirred and mixed uniformly, and then mixed high cis-1,4-polybutadiene and straight asphalt in a weight ratio of 2:1.
Add 42 parts of masterbatch and stir and mix uniformly at 160°C, then add 55 parts of calcium carbonate and 25 parts of asbestos (Quebec Standard Grade 7R) and stir, and finally add 0.2 part of sulfur. A rubber asphalt composition was prepared by stirring at 160° C. for 3 hours. This rubber asphalt composition was heated to 160°C, and two sheets of polyester nonwoven fabric with the rubber asphalt composition and the polyethylene film bonded together were laminated together using a roll (so that the polyethylene film was on both sides of the rubber asphalt composition layer). The thickness of the rubber asphalt composition layer is 0.7 mm, and the total thickness is 1 mm.
．． A composite sheet of 5 types was manufactured. Example 2 Width is 1m, thickness is 0. A polyethylene film with a thickness of 30 μm was bonded to kraft paper (manufactured by Daiko Paper Co., Ltd.) having a basis weight of 757/wl by heat fusion to produce a kraft paper with a polyethylene film bonded thereto.

A composite sheet was produced using the kraft paper to which this polyethylene film was bonded and the polyester nonwoven fabric to which the polyethylene film used in Example 1 was bonded. In place of the joined polyester nonwoven fabric, a polyester nonwoven fabric with a width of 1 m, a thickness of 0.47!Lm, and a basis weight of 80y/7rI was used to produce a sheet in the same manner as in Example 1 except that the temperature was .

Reference example 1 Concrete base surface poured on a roof with a length of 1 m, width of 3 m, and area of 37 TI.
Immediately, the composite sheet obtained in Example 1 (1 m x 3 m rectangular) was pasted so that the polyester nonwoven fabric was in contact with the primer-coated surface.

Next, the pigmented main agent of Kaken Paint Co., Ltd.'s color urethane (trade name: Ureseal R-2) and the curing agent were mixed in a weight ratio of 1:1.
The urethane mixture obtained by uniformly mixing the urethane mixture at a ratio of 1:
After coating at a rate of 1k9/wl, it was cured for 7 days to form a waterproof layer with an average thickness of 2.5 mm. This waterproof layer did not blister even after six months of construction, and the waterproof layer did not change color. Reference Example 2 The same procedure as Reference Example 1 was carried out, except that the composite sheet obtained in Example 2 was used instead of the composite sheet obtained in Example 1, and the kraft paper was pasted so that it was in contact with the primer-coated surface. , forming a waterproof layer.

This waterproof layer did not blister even after six months of construction, and the waterproof layer did not change color. Reference Example 3 The sheet obtained in Comparative Example 1 was used instead of the composite sheet obtained in Example 1 (Other than that, the same procedure as in Reference Example 1 was carried out,
Formed a waterproof layer.

This waterproof layer has a diameter of 20 ci after one week has passed after installation.
7 dome-shaped blisters with a height of 2 cm were formed, and the waterproof layer turned brown and became ℃°C.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the composite sheet of the present invention. 1 is a composite sheet, 2 is a rubber asphalt composition layer, 3 is a base material having continuous voids, 4 is a film, 5 is a protective material, 6 is a film, and 7 is a nonwoven fabric.

Claims (1)

[Claims] 1 A base material having voids communicating with one side of the rubber asphalt composition layer is laminated via a film bonded to the base material, and a protective material is further laminated on the other side of the rubber asphalt composition layer. composite sheet.