JPH048785A - Sealing of end of sheet made of ept - Google Patents

Abstract

PURPOSE:To improve adhesiveness, base resistance, weather resistance and water resistance of sheet made of EPT by applying a sealing material consisting of a urethane-modified epoxy resin, a tackifier and a curing agent to both the surfaces of an ethylene propylene terpolymer sheet and a substrate. CONSTITUTION:A sealing material consisting of (A) 100 pts.wt. urethane-modified epoxy resin, (B) 20-150 pts.wt. tackifier for an ethylene propylene terpolymer and (C) a curing agent is applied to the bath the surfaces to be contacted of sheets made of an ethylene propylene terpolymer and a concrete or mortar substrate, respectively, from the end of the sheet to the substrate to seal the end of the sheet.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an ethylene-propylene terpolymer (hereinafter referred to as
This invention relates to a sealing method for GITNO terminals manufactured by EPT.

<Prior Art> EPT sheets are used in sheet waterproofing methods for waterproofing concrete or mortar buildings. In the sheet waterproofing method, a waterproof sheet made of EPT or the like is adhered to cocrete or mortar using a rubber-based, epoxy-based, urethane-based, or synthetic resin emulsion-based adhesive, but the end portions of the sheet are particularly susceptible to peeling off.

Therefore, when fishing on a boat, the end of the sheet is sealed by applying a sealant to the surface of the sheet and the base material from the end of the sheet to the base material.

Further, regarding the so-called joint portion of the sheets, a sealing agent is applied to the surfaces of both sheets from the end portion of one sheet to the end portion of the other sheet to seal the end portions of both sheets.

By the way, conventionally, one-component type silicone sealants have been exclusively used as sealants for such applications. However, when the waterproof sheet is made of EPT, the wave-shaped silicone sealant does not have sufficient adhesion to EPT, so the end portion of the EPT sheet whose end portion is sealed with the sealant is likely to peel off. Therefore, there was a drawback that water easily penetrated the end portion of the EPT sheet.

Furthermore, no sealing agent other than the -wave type silicone sealant is known.

<Problems to be Solved by the Invention> When using an EPT sheet, whose weather resistance has attracted attention in recent years, as a waterproof sheet, it is necessary to use a sealant applied to seal the end portion of the EPT sheet as described above. is currently unknown.

The sealant for sealing the end portion of the EPT sheet must (a) have excellent adhesion to the EPT sheet, (b) not deteriorate the EPT sheet, and (C) contain concrete, etc. The following properties are required: (d) excellent weather resistance and water resistance; and (e) economical properties.

The present invention was made in view of the above facts, and has excellent adhesion, base resistance, and water resistance, and can be bonded to EPT sheets and concrete or mortar base materials without the need for brimer treatment. E using sealant
The purpose of this invention is to provide a method for sealing the ends of PT sheets.

Means for Solving the Problems> The present invention is a method for sealing the end of an ethylene-propylene copolymer sheet adhered to a base material of concrete or mortar, comprising: 100 parts by weight of a urethane-modified epoxy resin; In contrast, adhesion promoter 20 for ethylene-propylene terpolymer
A sealing agent containing ~150 parts by weight and a curing agent,
By applying the ethylene-propylene terpolymer sheet to the surface of the ethylene-propylene terpolymer sheet and the base material from the end of the ethylene-propylene terpolymer sheet to the base material, the ethylene-propylene terpolymer The present invention provides a method for sealing the ends of an ethylene-propylene terpolymer sheet, which comprises sealing the ends of a composite sheet.

The present invention also provides a method for sealing the ends of an ethylene/propylene terpolymer sheet adhered to a base material made of concrete or mortar. Adhesive agent 20 for original copolymer
A sealing agent containing ~150 parts by weight and a curing agent,
It is characterized by sealing the ends of a plurality of ethylene/propylene terpolymer sheets by applying it to the surface near the end lap portions or butt portions of the ethylene/propylene terpolymer sheets. The present invention provides a method for sealing the ends of a sheet made of ethylene/propylene terpolymer.

The sealant further comprises epoxidized natural rubber,
20 to 100 parts by weight of urethane-modified epoxy resin
It is preferable that the content is 80 parts by weight.

The present invention will be explained in detail below.

The first aspect of the present invention is to coat the surfaces of the EPT sheet and the base material with a specific two-component agent described below from the end of the EPT sheet adhered to a concrete or mortar base material to the base material. This is a method for sealing the ends of an EPT sheet, characterized in that the ends of the EPT sheet are sealed by applying a mold sealant.

That is, as shown in FIG. 1, adhesive 4 is applied to base material 2.
or by applying a specific two-component sealant 3 described later to the surface from the end portion of the EPT sheet 1 adhered with the adhesive 4 and the temporary fixing tape 5 to the base material 2. be.

A second aspect of the present invention is to apply a specific two-component sealant described below to the surface near the seam of a plurality of EPT sheets bonded to a base material made of concrete or mortar. , a method for sealing the ends of an EPT sheet, characterized by sealing the ends of the EPT sheet.

That is, as shown in FIG. 2, from the surface near the end of the EPT sheet 1a adhered to the base material 2 with the adhesive 4, the end of the EPT sheet 1a, which is also adhered to the base material 2 with the adhesive 4, The portion extends to the surface near the end portion of the EPT sheet 1b which is adhered to the surface of the end portion of the sheet 1a with adhesive 4 or with adhesive 4 and temporary tape 5 (this sheet 1a and sheet 1
The overlapping part of b is called a lap part), and is a method of applying a specific two-component sealant 3 described later. Although not shown in FIG. 2, the EPT sheet 1a also has adhesive 4.
It may be adhered to the base material 2 with a temporary tape.

Alternatively, as shown in FIG. 3a, adhesive 4 is applied to base material 2.
In this method, a specific two-component sealing agent 3 described later is applied to the surface of the EPT sheets 1a and 1b bonded together near the end abutting portions. Although not shown in FIG. 3a, the EPT sheets 1a and/or 1b are attached to the base material by adhesive 4 and temporary tape.
It may be glued to.

In this case, the applied sealant 3 is applied to the sheet 1.
The sheet I
It may get between the end of ai and the end of sheet 1b, or it may even reach the base material 2, as shown in FIG. 3C.

The sealing agent used in the first and second aspects of the present invention is a specific two-component sealant described below, and the method for using it is that after mixing the two components at a predetermined ratio, the sealant is used under normal conditions. , apply a sealant to a predetermined position by a method such as a gun method, and then apply a sealant to a predetermined position by a method such as a method using a gun, and then apply a sealant of about 0.5
It is sufficient to cure it for about 7 days.

Further, the EPT sheet used in the methods of the first and second embodiments of the present invention is a triester consisting of ethylene, propylene, and dienes such as butadiene, dicyclopentadiene, and 5-methylene-2-norbornene. It is a sheet made of original copolymer.

Note that the adhesive and bonding method for bonding the EPT sheet to the base material are not limited, and any known adhesive or known method may be used. Also, use tape for temporary fixing.
The material of the tape for temporarily fixing the T sheet to a base material is not limited, and any known tape such as butyl tape may be used.

The sealing agent used in the first and second aspects of the present invention is as follows: (1) Based on 100 parts by weight of the urethane-modified epoxy resin,
One containing 20 to 150 parts by weight of an adhesion imparting agent for ethylene/propylene terpolymer and a curing agent, (2) per 100 parts by weight of urethane-modified epoxy resin,
20 to 150 parts by weight of an adhesion agent for the ethylene/propylene terpolymer and 20 to 8 parts by weight of epoxidized natural rubber.
0 parts by weight, and a curing agent.

The components contained in these urethane-modified epoxy resin sealants will be explained in detail below.

The components contained in the urethane-modified epoxy resin sealant are a urethane-modified epoxy resin, an adhesive agent for EPT, a curing agent, and epoxidized natural rubber.

The urethane-modified epoxy resin is produced by reacting (a) a compound having an epoxy group and a hydroxyl group with a urethane-bonded metal compound containing an isocyanate group at the end obtained from a polyhydroxyl compound and a polyisocyanate compound. can be obtained.

(a) A compound having an epoxy group and a hydroxyl group is a compound having 1 to 3 epoxy groups and 1 to 2 hydroxyl groups in the molecule, and preferably has a molecular weight of 70 to 70.
2000 compounds. Examples include glycidyl ethers of polyhydric alcohols such as glycidol, ethylene glycol monoglycidyl ether, and glycerin diglycidyl ether, and commercially available epoxy resins having hydroxyl groups.

(b) The urethane-bonded gold-containing compound containing an isocyanate group at the terminal is produced by the reaction of (b-1) a polyhydroxyl compound and (b-2) a polyisocyanate compound.

(b-1) As the polyhydroxyl compound, for example,
Examples include various polyester polyols or polyether polyols used in the production of general urethane compounds.

Examples of the polyester polyol mentioned here include condensates of polyhydric alcohols and polybasic carboxylic acids, condensates of hydroxycarboxylic acids and polyhydric alcohols, etc. The polyhydric alcohols used in these include, for example, ethylene Examples of polybasic carbonic acids include glycol, propylene glycol, butanediol, diethylene glycol, glycerin, hexanetriol, and trimethylolpropane. Examples of polybasic carbonic acids include adipic acid, geltaric acid, azelaic acid, fumaric acid, maleic acid, phthalic acid, Examples include terephthalic acid, dimer acid, and pyromellitic acid.

In addition, condensates of hydroxycarboxylic acids and polyhydric alcohols include castor oil, castor oil and ethylene glycol,
Reaction products such as propylene glycol are also useful.

Examples of polyether polyols include products obtained by addition-polymerizing one or more alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran to a compound having two or more active hydrogens, Any known polyether polyol used in the production of ordinary polyurethane resins can be used. In this case, examples of compounds having two or more active hydrogens include the polyhydric alcohols and polybasic carboxylic acids mentioned above, amines such as ethylenediamine and hexamethylenediamine, ethanolamine, and propatoolamine. Examples include alkanolamines such as resorcinol, polyhydric phenols such as bisphenol, and castor oil.

(b-2) The polyisocyanate compound used in the production of a urethane bond-containing compound containing an isocyanate group at the end is a compound having two or more incyanate groups in the molecule, and is a compound used in the production of ordinary polyurethane resins. Commonly used diisocyanates include, for example, tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, triphenylmethane triisocyanate, and the like.

The urethane-modified epoxy resin has the above (a) and (b-1)
, (b-2), preferably as follows.

The urethane bond-containing compound containing an isocyanate group at the end can be obtained by reacting a polyhydroxyl compound and a polyisocyanate compound in the same manner as in the production method of a usual incyanate group-containing urethane prepolymer.

A urethane-modified epoxy resin can be obtained by reacting a urethane bond-containing compound containing an incyanate group at the end with the above-mentioned compound having an epoxy group and a hydroxyl group by a conventional method.

The adhesion imparting agent for EPT may be any adhesive compound having a polarity close to that of EPT, but preferably butyl rubber, halogenated butyl rubber, EPT, styrene-ethylene/butylene block copolymer, carboxyl group-containing styrene- One or more types of ethylene/butylene block copolymers are used.

As the curing agent, a general curing agent for epoxy resins can be used, but preferably a curing agent used in a room temperature curing solvent-based epoxy resin adhesive is used.

Specifically, aliphatic polyamines, aromatic polyamines, modified aliphatic polyamines, polyamide amines, various mercaptan curing agents, and liquid NBR1 having an amino group at the end.
Examples include acid anhydrides, latent curing agents, and tertiary amines, with polyamines being preferred.

These curing agents may be used alone or in combination.

Epoxidized natural rubber is made by oxidizing some of the double bonds of natural rubber latex to epoxidize it. For example, ENR-2 is oxidized using peracetic acid, etc.
0, ENR30, ENR-50 (both KUM P
OLANGUTHRIE 5ENDIRIAN BER
Products known by trade names such as "HAD" are commercially available, and these may be used.

Such epoxidized natural rubber is compatible with epoxy resin, and when mixed with epoxy resin, it imparts excellent tackiness to the epoxy resin composition and improves the elongation of the cured product of the epoxy resin composition. .

The epoxidation rate of the epoxidized natural rubber may be 20% or more, preferably 30% or more of the double bonds present in the natural rubber.

If it is less than 20%, the compatibility with the epoxy resin is poor,
This is because, on the contrary, adhesive properties and the like deteriorate.

Next, the blending amounts of each component will be described.

The urethane-modified epoxy resin sealing agent used in the present invention contains (1) 20 to 150 parts by weight, preferably 50 to 120 parts by weight, of an adhesive agent for EPT, and a curing agent, based on 100 parts by weight of the urethane-modified epoxy resin. or (2) 20 to 150 parts by weight, preferably 50 to 120 parts by weight of an adhesion imparting agent for EPT, and 20 to 80 parts by weight of epoxidized natural rubber, based on 100 parts by weight of the urethane-modified epoxy resin. It preferably contains 30 to 701 parts by weight and a curing agent.

If the amount of adhesion imparting agent for EPT is less than 20 parts by weight, the cured product of the sealant will have insufficient adhesion to the EPT sheet, and if it exceeds 150 parts by weight, it will not be particularly effective even if the amount is more than 150 parts by weight. Not only does it not peel off, it is also water resistant.
Base resistance deteriorates.

The amount of curing agent used is not particularly limited, but preferably 10 to 2 parts by weight per 100 parts by weight of the urethane-modified epoxy resin.
00 parts by weight.

Within this range, an appropriate curing speed will be achieved.

If the amount of epoxidized natural rubber is less than 20 parts by weight, the elongation of the cured product of the urethane-modified epoxy resin sealant used in the present invention will be reduced, which is undesirable. If it exceeds 80 parts by weight, the sealant itself will The viscosity increases,
Workability deteriorates.

In addition to the above-mentioned essential components, various additives can be added to such a urethane-modified epoxy resin sealant as necessary.

For example, solvents, tackifiers, anti-sagging agents, fillers, curing accelerators, pigments, adhesion agents, antifoaming agents, leveling agents,
These are polymerization agents, rubber, plasticizers, heat-resistant anti-aging agents, and other additives.

Furthermore, an unmodified epoxy resin may also be added.

As the solvent, xylene, toluene, methyl ethyl ketone, etc. are preferably used, and as the filler, silica, talc, calcium carbonate, clay calcium silicate, etc. are preferably used.

In addition, as a tackifier, rosin or its conductor,
Natural resins such as terpene resins, petroleum resins, hydrogenated petroleum resins, etc. are preferably used.

The urethane-modified epoxy resin sealant may be manufactured as a two-component type containing only one of a urethane-modified epoxy resin and a curing agent, and preferably contains a urethane-modified epoxy resin, an adhesion imparting agent, and a filler. etc. may be mixed with a solvent to form a one-part sealant, and on the other hand, a curing agent, a solvent, a filler, etc. may be mixed to form a two-part sealant, and a two-part room temperature curing sealant may be obtained.

<Example> The present invention will be specifically described below with reference to Examples and Comparative Examples.

(1) Manufacturing compositions of sealing agents in Examples and Comparative Examples are shown in Table 1.

Sealing agent - liquid is urethane modified epoxy resin, EP
It was obtained by mixing an adhesion agent for T, epoxidized natural rubber, a solvent, and other specified raw materials.

The two-part sealant was obtained by mixing a curing agent, a solvent, and other window raw materials.

(2) Peel adhesion strength As the adherends to be sealed, an EPT sheet and a slate board (made by mortar) were used.

After mixing the sealant liquid and the two sealant liquids, apply it uniformly to the surface of the slate board, and apply EP to the coated surface.
T-sheets were crimped and cured under normal conditions (20±2℃, 60℃ 1
0% RH). Peel sealing strength was measured under the following conditions using a test piece after 48 hours of normal curing.

In addition, a test piece was prepared in the same manner using a conventionally used 17-night silicone sealant, and the peel adhesion strength was measured. The results are shown in Table 1.

(a) Peeling at 180 degrees at a tensile speed of 200 mm/min at normal room temperature
The test was conducted.

(b) Place the base resistance test piece in a 0.1% aqueous sodium hydroxide solution at room temperature for 48 hours.
After soaking for a period of time, a peel test was conducted under the same conditions as the normal sealing force.

(c) Heat resistance test piece was heated for 48 hours in a constant temperature bath adjusted to 80°C, then allowed to cool at room temperature for 2 hours, and a peel test was conducted under the same conditions as the normal sealing force.

(3) Stretch sealant - A mixture of a liquid and a two-part sealant or a conventional one-component silicone sealant with a thickness of 2 mm and normal curing (20±2℃, 60±10℃)
%RH). After 48 hours of normal curing, a test piece was punched out using a No. 2 dumbbell, and a tensile test was conducted according to JIS K6301 to measure elongation. The results are shown in Table 1.

Explanation of the ingredients of Sealing <1> 1) Glycidol, polytetramethylene gupgol (molecular weight 85σχ, kerethane-modified epoxy resin made from toile diisocyanate (epoxy equivalent weight 68o) 2) Glycidol, polybutylene diglycol (molecular weight 2000), urethane modified epoxy resin made from isophorone diisocyanate (epoxy equivalent weight 1300) 3) Hydrogenated bisphenol A type epoxy resin EP-408
0, Asahi Denka Kogyo Co., Ltd. (epoxy equivalent: 25o) 4) Powder 47
Minacrylonitrile/butadiene rubber HYCARAT
BN 1300x16, manufactured by Gutdrich Chemical Company 5
) Modified aliphatic polyamine ADEKA hardener EH-270, manufactured by Asahi Denka Kogyo Co., Ltd. 6)
2,4.6-)-li(dimethinogeminomethyl)phenol sequal TDMP Manufactured by i-Oh Kagaku Co., Ltd. 7
] Kraton G1652, manufactured by Shell Chemical Company 8)
Toughtic M, manufactured by Asahi Kasei Industries, Ltd. As shown in Table 1, when an EPT sheet and a slate board are bonded using the sealant used in the method of the present invention, the adhesive strength in normal conditions, base resistance, and heat resistance is improved. Large adhesion was possible.

Furthermore, the cured product of G-SONG agent used in the method of the present invention is
It had excellent elongation properties.

Therefore, if the ends of the EPT sheet are sealed using such a sealant, the EPT sheet will not peel off, and the EPT sheet will not peel off.
Improves performance as a waterproof sheet.

<Effects of the Invention> The urethane-modified epoxy resin sealing agent used in the method for sealing the ends of EPT sheets of the present invention has the following characteristics. When sealing the end portion of a manufactured sheet, work efficiency is improved, time is shortened, and performance after construction is significantly improved.

(1) Long pot life.

(2) Oven assembly time can be longer.

(3) Adheres to EPT sheets and concrete or mortar base materials without brimer treatment.

(4) Excellent adhesiveness.

(5) Excellent flexibility.

(6) Good water resistance and base resistance.

[Brief explanation of drawings]

FIGS. 1, 2, and 3a are diagrammatic cross-sectional views illustrating the method for sealing the end of an EPT sheet according to the present invention,
Figures 343b and 3c are partially enlarged views of Figure 3a (
Diagrammatic sectional view). Explanation of symbols b... Sheet, 2... Base material, 3... Sealing agent, 4... Adhesive agent, 5... Tape IGI FIG, 3b FIG, 3c

Claims (3)

[Claims] (1) A method for sealing the ends of an ethylene-propylene terpolymer sheet adhered to a base material made of concrete or mortar, comprising: urethane-modified epoxy resin 1
00 parts by weight, a sealing agent containing 20 to 150 parts by weight of an adhesion imparting agent for the ethylene/propylene terpolymer and a curing agent is applied from the end of the ethylene/propylene terpolymer sheet to the above. The ethylene/propylene terpolymer sheet is applied to the surface of the ethylene/propylene terpolymer sheet and the base material to seal the ends of the ethylene/propylene terpolymer sheet. A method for sealing the ends of a propylene terpolymer sheet. (2) A method for sealing the ends of an ethylene/propylene terpolymer sheet adhered to a base material made of concrete or mortar, wherein ethylene/propylene ternary copolymer is added to 100 parts by weight of a urethane-modified epoxy resin. Adhesion imparting agent 20 for coalescence
A sealing agent containing ~150 parts by weight and a curing agent,
It is characterized by sealing the ends of a plurality of ethylene/propylene terpolymer sheets by applying it to the surface near the end lap portions or butt portions of the ethylene/propylene terpolymer sheets. A method for sealing the ends of sheets made of ethylene-propylene terpolymer. (3) The sealing agent further contains 20 to 80 parts by weight of epoxidized natural rubber based on 100 parts by weight of the urethane-modified epoxy resin.
A method for sealing an end of an ethylene-propylene terpolymer sheet as described in .