JPS58164667A - Waterproofing technique - Google Patents

Abstract

PURPOSE:To carry out waterproofing easily without deleterious change in working circumstances, by applying a water-base adhesive consisting mainly of an ethylene/vinyl ester copolymer dispersion onto one side of a ground such as concrete or plywood and pressing a waterproof sheet against the adhesive in a highly dried state. CONSTITUTION:A water-base adhesive consisting mainly of an aq. dispersion with a glass transition temp. of -5--40 deg.C, having 5-50wt% ethylene content and 95-50wt% vinyl ester (e.g., vinyl acetate, vinyl propionate) content is applied on one side of a ground comprising concrete or plywood, and a waterproof sheet (e.g., a sheet consisting mainly of ethylene/propylene/diene terpolymer) is pressed against the adhesive in a dryness of 40-100%. There is no fear of deleterious change in working circumstances caused by evaporation of solvents. When dried, waterproofing can be carried out in application onto only one side but not both sides, which are difficult to work, and also in a highly dried state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses nine waterproofing methods using **sheets used for roof inder materials.

Conventional waterproofing methods for structures include asphalt waterproofing, mortar waterproofing, sheet waterproofing, and m-membrane waterproofing.Among these, sheet waterproofing has been widely adopted due to its ease of construction and excellent waterproof performance, and its construction track record has increased in recent years. It's growing nicely.

However, in the conventional sheet fat water construction method, organic solvent-based glue cIc is used to bond the base material such as slab concrete, the waterproof sheet, and O.
It is necessary to apply 1iK# adhesive to both the base and waterproof sheet using a prene rubber type or butyl rubber type adhesive, dry the 10011, and press it for 90 minutes.

Although it is said to be easier to implement than the water method, it has problems such as deterioration of the papermaking work environment due to organic solvent emission and the complexity of making 1 ml of paper.

From these and other viewpoints, the use of various water-based adhesives has been proposed, but these water-based adhesives have various problems. For example, acrylic products are alkali resistant,
Low-temperature adhesion is insufficient, and synthetic rubber type 040 has drawbacks not only in low-temperature adhesion but also in durability. Tarpaulin sheets are made of ethylene-propylene-genter primer (hereinafter abbreviated as EPT) as its main ingredient due to its good durability, and there are various types of tarpaulin sheets, but these sheets are generally difficult to adhere to because of their low polarity and hydrophobicity. In particular, the fact is that the water-based adhesive described above does not provide sufficient adhesion for EPT sheets, let alone when coated on one side of the substrate, or even when coated on both sides. Recently, sheets with an adhesive layer that have improved the adhesive properties of EPT sheets have been sold, but some acrylic emulsions will adhere to these, but if the degree of dryness is high, the tack will be lost and pressure bonding will not be possible. The reality is that it will disappear.

The inventors of the present invention have conducted extensive research on a method of waterproofing by applying a single-sided coating to the base using a waterproof sheet containing EPT as its main component without deteriorating the working environment71! i fruit! The inventors have discovered that the required performance can be satisfied by using an adhesive composition containing a certain range of ethylene-vinyl ester copolymer dispersion as a main component, and have thus arrived at the present invention.

That is, an aqueous dispersion with an ethylene content of 5 to 50% by weight and a vinyl ester content of 5 to 50% on a surface made of slab concrete and special plywood and a glass transition temperature of 15°C to -40°C. A piece of water-based adhesive composition mainly composed of
This is a waterproofing method in which the mold is coated and then the waterproof sheet is crimped.Once it dries, the work is done.
It is important to apply the adhesive on one side and in a highly dry state.Dryness refers to the apparent dryness, and the adhesive layer dries after application.According to JIK, the adhesive layer changes from milky white to transparent. The drying time changes to the point where it becomes transparent.
It shall be O#II.

The waterproof sheets used in the present invention include unvulcanized sheets and vulcanized sheets made of EPT butyl rubber, polychloroprene sheets, chlorosulfonated polyethylene sheets, ethylene-vinyl acetate copolymer sheets, polychlorinated sheets, etc. Vinyl sheets and asphalt-based fat-water sheets made by laminating the above-mentioned synthetic polymers as the main raw material and a base fabric and other materials and soaking asphalt in the base fabric can all be used. Nine EFT's with excellent durability and strength
A waterproof sheet containing as a main component is preferable.

The ethylene content of the ethylene-vinyl ester copolymer that can be used for WAKIN of the present invention is 5 to 50% by weight. If the weight is less than 5 weight bags, the adhesiveness to EFT will decrease even if the glass transition temperature is 15° C. or less, and if it exceeds 50 weight bags, the cohesive force will be extremely reduced and the high temperature adhesive strength will be reduced. The vinyl ester content is limited to 50-95% by weight. If the weight is less than 50%, the cohesive force decreases and the high temperature adhesive strength decreases.
If the weight exceeds -, the low-temperature adhesive strength decreases.

The vinyl ester used in the present invention has 2 or more carbon atoms.
Vinyl esters of 12 aliphatic carboxylic acids, such as vinyl acetate, vinyl propionate, vinyl laurate, and vinyl tertiary carboxylates with an average carbon number of 10 (VeoVa
10 m (Shell company product name)
IIPK vinyl acetate, vinyl propionate V@ova
1 G and mixtures thereof are effective.

Furthermore, as long as the above two components are within a specific range, it is also possible to use a component that can be copolymerized together with these two components. Particularly suitable are acrylic acid esters of 11 tL or less, phosphor acrylate, hexyl acrylate, 2-ethylhexyl acrylate, etc. Other copolymerizable unsaturated compounds include acrylic acid, methacrylic acid, maleic acid, fumaric acid, etc. acids, unsaturated carboxylic acids such as crotonic acid and itaconic acid,
Methacrylic ester, N-vinylpyrrolidone, acrylamide, 2-hydroxyethyl acrylate, N-
Examples include methylol acrylamide, glycidyl methacrylate, vinyl chloride, diallyl phthalate, triallyl cyanurate, ethylene glycol dimethacrylate, etc. The aqueous dispersion used in the present invention is prepared in the presence of a surfactant or a safety coid. Although a protective colloid is preferable, it is also effective to use a protective colloid alone or in combination with a surfactant. Polyvinyl alcohol (hereinafter referred to as Pvm) is the best protective colloid, with an average degree of polymerization of 100.
-4200, degree of saponification 70-100 molar Os fraction Saponified product t'#- is completely saponified, and in addition to 7-acrylonitrile, acrylamide, talonic acid, acrylic acid, methacrylic acid, 4-leic acid in the polymerization process. , copolymerization of unsaturated carboxylic acids such as itaconic acid and their esters in alcohol with vinyl acetate and saponification, and reaction of PVA with sulfuric acid, phosphoric acid, formalin, urea, maleic anhydride, etc. So-called qualitative properties such as things pvAtiFipv
As the protective colloid other than OPVA, which can also be used as an As conductor, maleic anhydride-isobutylene copolymer, carmenic acid-loving copolymer of styrene, diethyl cellulose in hydrochloride, hydroxyglobil cellulose, etc. can be used.

As the surfactant, commercially available anionic surfactants, nonionic surfactants, and cationic surfactants are used.

The polymerization initiator used is a water-soluble inorganic peroxide such as hydrogen peroxide or potassium persulfate, or a persulfate or an azo compound.A redox type initiator can be created by combining these with oxidation. You can also use −′□”4.

In the polymerization method, the vinyl ester may be added all at once, in portions, or continuously.

The glass transition ii* of the aqueous copolymer dispersion applied to the present invention is limited to -5° to -40'C.

The value of the cough transition temperature varies depending on the scooping method, but here it is determined by TBA.

Frequency IH3 or lower) refers to the value determined by K. About TBAK#
For example, Chemical Society of Japan Nabe; f#Experimental Chemistry Course Volume 19;
Page 904 (Published by Kufyo in 1978) K listed 0
When the glass transition temperature is higher than 15°C, the adhesive strength at room temperature and low temperature decreases, and when the glass transition temperature is below -40'C, the adhesive strength at bird temperature decreases, making it unsuitable. 〇 The construction method of the present invention is to apply the wrinkled ethylene-vinyl ester copolymer aqueous component to the base material, such as slab concrete platform special plywood, etc., and achieve a dryness of 40 to 100 cm. It consists of oven time in a bottle and then crimping the tarpaulin residue, but when dry: 1. For substrates with a weave of 40 seconds or less, which are difficult to mature, 1.
・、：・・・1 After applying VIL, there is a risk of damage to the adhesive of the pigeon house, so it is necessary to dry it for more than 40 minutes before laminating.

The construction measures of the present invention are mainly Kl & water-based concrete,
Although it is made of mortar, it can also be applied to non-water-based insulation materials and waterproof sheets. However, in that case, it is necessary to dry the adhesive layer for 100 minutes before bonding.

A feature of the present invention is that waterproofing is performed once under specific conditions using a specific adhesive using a waterproof sheet containing non-polar EPT as a main component. Namely.

Most common water-based adhesives have properties that allow them to act as release agents as well as adhesives for EPTK, and even the well-known aqueous ethylene-vinyl ester copolymer dispersion has low adhesive properties. However, the glass transition temperature is 15℃.
The round-hole copolymer mainly composed of vinyl ester and ethylene with a composition in a specific range at ~-40°C exhibits significantly high adhesion to EPTK, and the low-temperature adhesive strength is improved to 41%.

The wrinkle adhesive has ethylene as one of its main components, so it is different from rubber-based adhesives. Oligomers are synthesized during one polymerization, and tackifying substances are also automatically synthesized, which improves the adhesion to waterproof sheets and to other substances. The adhesion is improved and the workability is good (4).

Furthermore, one of the features of the present invention is that it is non-polluting, water-based, and can be bonded to a concrete base plate @ 0 base plate with one single-sided coating without the need for a primer, making it possible to apply it in a single-sided manner. Of course, it also has excellent cold resistance, heat resistance, and aging resistance.

Adhesives used in Kabumoto-1 may be prepared by mixing aqueous dispersions of other polymers, such as vinyl-based polymers, acrylic, monoalcohol-based copolymers, and aqueous dispersions of other polymers. Examples include aqueous dispersions Il of olefin polymers, vinyl chloride polymers, styrene-butadiene copolymers, and the like. Furthermore, stone additives commonly used in the adhesive of the present invention, such as thickeners, tackifiers, hazy agents, antifoaming agents, isocyanate compounds in pigments, phenolic resins,
A melamine resin, a urea resin, a crosslinking agent such as an Epoxy compound, etc. may be mixed, but as in the case of mixing other polymer aqueous dispersions mentioned above, it is necessary to use a crosslinking agent that does not reduce the performance of the composition. amount of kill.

Hereinafter, we will give two examples of detailed examples and ratios to illustrate the present invention.
However, these examples are not intended to limit the invention. ``s'' and ``arrogance'' in these examples are expressed on the basis of @t)Fi storage capacity unless otherwise specified.

Example 1 In an autoclave with a stirrer and a jacket, 60.3 parts of ion-exchanged water and 0.2% of sodium bisulfate were added.

Potassium persulfate 0.5i1S, PVA (saponification degree 88 molar capsules, polymerization degree 500) 2.6f! 6. Add 1.3 parts of diethylene nonylphenyl ether (number of moles of ethylene oxide added - 30) in polyethylene, dissolve uniformly, and apply ethylene pressure to 501 v/j K to adjust the ratio to 3o+:1'c.

0.06 parts of sodium metabisulfite and 0.26 parts of ion-exchanged water
1/6 of this solution was added to the autoclave. At the same time, 52.5 parts of vinyl acetate was continuously added over a period of 11 hours, and 7.2 parts of polyoxyethylene nonyl was added to 33.79 parts of ion-exchanged water.

ether (ethylene oxide addition mole a-30) 1.
A solution containing 3 parts was added sequentially. Polymerization started immediately upon addition of vinyl acetate. During the polymerization, add the remaining p of the sodium metabisulfite solution in 5 WAK portions.During the polymerization, take a small sample as appropriate and use the bromine titration method to determine the vinyl acetate 11 degrees in the system. Nine. 9 ethylene pressure is 50 IQ/ai, temperature is 3
It can be maintained at a constant temperature of ±1°C after adding vinyl acetate. The stability of the hydrotactic dispersion obtained was good, and the composition of the six-scissor dispersion is shown in the first machine.

Armpit dispersion on sidewalk 1 [(305w830m, JIS
-A-5304) with a sponge roller.
The adhesive layer was applied with a coating weight of 7i and the apparent dryness of the adhesive layer was 70 after 30 minutes of open time. Next, an EPT waterproof sheet (Toyo Rubber Co., Ltd.) was crimped and the bales were cured for 3 days (1
) to ts+ conduct the adhesion strength test.

(υ Regular embroidery peeling strong vertical Peel at 20°C, auto 3::: The 90°I11 separation strength was determined using a graph.

, 11° (1) Water Resistance--Strength 20°C 6 □ After immersing in tap water for one hour, maintain the peel strength in accordance with (1) (in a wet state).

(1) Warm Leap Test Shear creep was measured under a load of 200 tons at 70°C.
(Adhesion area: 25 x zs)
After curing for 3 days, the 90° peel strength was measured at 5°C and the results are shown in Section 2-.

As is clear from the table, it has good adhesion at low temperatures, and is also excellent in normal state, water resistance strength, and high temperature creep properties.

Example 2 In the same autoclave as in Example, 70% of P V A 4.51B with an average degree of polymerization of 1700 and a degree of saponification of 88 mol-0
76 parts of vinyl ester of a tertiary carboxylic acid having an average carbon number of 10 and vinyl acetate were dissolved in 1% aqueous solution of hydrogen peroxide and 5s aqueous solution of Rongarits at 60°C under a pressure of 35 kl/j of ethylene. was used for continuous polymerization. The resulting aqueous dispersion was stable. The composition of the dispersion is shown in Table 1. Table 2 shows the peel strength measured in the same manner as in Example 1.

Example 3 In the same autoclave as in Example 1, an average polymerization degree of 1700,
PVA21B with a saponification degree of 88 mol- and a nonionic activator (
Norpol 4001 (manufactured by Sanyo Chemical) 2s was dissolved in 70s of ion-exchanged water, and under 401v/j ethylene pressure, 50
Acrylic acid, 0.5 part of phosphoric acid, vinyl acetate 6011.2-
The composition of the hydrotactic dispersion obtained by continuous polymerization of 22s of ethyl silacrylate using an aqueous solution of am7nium persulfate is shown in Table 1, and the results of adhesion performance evaluation are shown in Table 2*.

Example 4 An aqueous dispersion with a different monomer composition was obtained using the same polymerization method as in Example 3. The composition is shown in No. 111. Isa dispersion liquid 100
Dipterphthale) 3s was added and mixed to m to prepare a composition, and the adhesive performance was evaluated. The results are shown in Table 2.

Example 5 An aqueous dispersion having a different monomer composition was obtained by the same polymerization method as in Example 3. The composition of 90 mL of the dispersion is shown in Table 1. The adhesive performance of the dispersion is shown in Table 2. Example 6 Polymerization was carried out under the same conditions except that 5 parts of a nonionic activator (Noniball 200) was used in place of 5 parts of PVA in Example 2. The composition of the obtained aqueous dispersion is shown in Table 1t4 and the adhesion performance of the cough dispersion is shown in Table 2.0 Example 7 In place of 5 parts of PVA in Example 2, 1 part of diethyl cellulose and nonionic active [1j (Nonipole 200) 4@
Polymerization was carried out under the same conditions except that . The composition of the resulting nine-bonded dispersion is shown in 1st*, and the adhesion performance of the carcass dispersion is shown in 2nd.
Shown in the table.

Comparative examples 1 to 4 Polymerization was carried out using the same polymerization method as in the examples, but with different monomer compositions.

Table 1 shows the composition of the nine-pronged dispersion obtained. Measurements were made under the same conditions as in Example 1, and good adhesion performance was shown in the second group.

As is clear from Table 2, the glass transition temperature is −・t′
.

Items outside the range of 5℃ to -40℃, ethylene content of 5wtn or less, vinyl ester content of 50 to 9
Items outside of the 5 weight range, regular rise, water resistance, low peeling strength II! and high temperature creep properties.

It can be seen that one of them is low.

Comparative Example 5 and Example 8 An outdoor construction test was conducted using the aqueous dispersion used in Example 2 under the above conditions.

Base: Concrete integrally coated with polymer cement mortar to a thickness of 5 m Adherent material: EPT waterproof sheet [Toyo Rubber TS-8 sheet] Application type: 300 f/m' (wet), adhesive surface structure The aqueous dispersion was applied to a 1 m x 1 m substrate using a roller, and an open time was taken, and when the apparent dryness reached an apparent dryness of 10 m x 60 m, a waterproof sheet was laminated to each base.

Next, assuming rainfall immediately after construction, 3 times after applying the aqueous dispersion.
After an hour water was sprinkled on the waterproof sort.

After 24 hours of watering, we made a 25-wide cut in the edge of the tarpaulin sheet and measured the adhesive strength between the tarpaulin sheet and the substrate.When the degree of dryness was 10%, it was 60*o*eu-ti. """Pa・", 01V/25" I got it in 1.

If a waterproof sheet is attached to a substrate with relatively low water absorption, such as polymer-containing cement mortar, when the dryness level of the adhesive is low, there is a risk of poor adhesion due to rainfall after construction.

Patent applicant Kuraray Co., Ltd. Agent Benshio Honda Satoru

Claims (1)

[Claims] (1) Concrete is a base made of plywood etc. Ethylene content 5-50% by weight, vinyl ester content 5-50%, glass transition temperature -50--4oQco
Waterproofing method 0 characterized by applying an aqueous adhesive containing an aqueous dispersion as a main component and press-bonding a waterproof sheet with a dryness of 40 to 10011. Patent claim 01 which is a sheet that
The waterproofing method described in Section 11111s1.