JPS59136246A - Waterproof sheet with adhesive layer - 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 roofing sheet, that is, a waterproof sheet used for waterproofing the roof of a building.

In recent years, roofing sheets using ethylene-propylene terpolymer vulcanized sheets, vinyl chloride sheets, polyolefin sheets, and the like have been commercially available. In order for these roofing sheets to perform a sufficient waterproof function, it is necessary to sufficiently bond the base concrete and the roofing sheet.

Generally, to bond the roofing sheet and the concrete base, an adhesive solution dissolved in petroleum solvent is applied to one side of the roofing sheet and the surface of the concrete base, and after a suitable open time, both are bonded together. A predetermined adhesive layer (adhesive layer) is formed in advance by crimping with a laminating roller or by applying an adhesive solution or rubber-based unvulcanized mixture to one side of the roofing sheet, and then adheres to the underlying concrete during construction. There is a method in which a roofing sheet is applied and a roofing sheet is bonded and pressed through the adhesive layer after a suitable open time is applied. However, the above method has the following drawbacks.

In other words, the surface of the underlying concrete on the roof of a general building has considerable irregularities, and the adhesive layer formed by applying an adhesive solution is not thick and is generally hard, so it is difficult to apply this to the underlying concrete surface. Even if it is crimped, a sufficient bonding area cannot be obtained and the waterproof function is low. To prevent this, when finishing the surface of the concrete base, apply multiple cans of a base conditioner (generally a polymer emulsion mixed with cement) or primer to the concrete surface to make the surface smooth. Although this is necessary, it is undesirable for construction sites, which are often pressed for construction deadlines, as it requires extra effort.

On the other hand, when using a roofing sheet with an adhesive layer formed by coating an unvulcanized rubber mixture, the adhesive layer is thick and flexible, so it can be used even when the underlying concrete is uneven. A sufficient adhesive area can be obtained. However, the adhesive layer has the disadvantage that its adhesive strength decreases significantly as the temperature increases. It is said that when a roofing sheet is exposed outdoors in the summer, the temperature rises to about 80 degrees Celsius. In such a case, the adhesive layer itself thermally expands or contracts, causing adhesive failure, causing the roofing sheet to deteriorate. Blisters, wrinkles, or peeling may occur, reducing the waterproof function.

The present invention aims to improve the above-mentioned drawbacks and provide a roofing sheet that is easy to install, exhibits excellent waterproofing properties, and has excellent heat resistance even when the underlying concrete surface has considerable unevenness. It was done for a purpose.

That is, the present invention includes 100 parts by weight of butyl rubber or halogenated butyl rubber, and 5 to 20 parts by weight of a non-crosslinkable polymeric substance.
An adhesive layer is formed on at least one side of the polymer sheet body by heating and crosslinking a compounded composition containing 0 parts by weight and 10 to 100 parts by weight of a tackifier and a crosslinking agent and a crosslinking aid. The present invention relates to a waterproof sheet with an adhesive layer, which is characterized by:

Butyl rubber and halogenated butyl rubber, which are one of the main components of the compounded composition, have the characteristics that crosslinked rubbers are more flexible and adhesive than other synthetic rubbers, and have excellent water resistance and chemical resistance. have When blending, either butyl rubber or norogenated butyl rubber may be used alone, or both may be used in combination.

The non-crosslinkable polymer substance, which is another main component of the blended composition, is a polymer that does not undergo crosslinking without being affected by the crosslinking agent and crosslinking aid when the blended composition is heated. The material is selected as appropriate depending on the crosslinking agent used.

For example, when using sulfur as a crosslinking agent, polyisobutylene, polybutene, etc., which are not affected by sulfur, are used.
When using a quinone-based crosslinking agent, use natural rubber, styrene-phtadiene copolymer, ethylene-propylene terformer, etc. that do not react with the quinone-based crosslinking agent, and when using a metal oxide as a crosslinking agent, use chloroprene and chlorosulfone. Most synthetic rubbers, excluding chemically modified polyethylene, etc.
One or more types of natural combs are used.

These non-crosslinking polymeric substances have the effect of imparting appropriate fluidity and flexibility to the adhesive layer formed by heating and crosslinking the above-mentioned unblended composition 11, and promoting adhesion.

The blending amount of the polymeric substance is 5 to 200 parts by weight, preferably 10 to 100 parts by weight, based on 100 parts by weight of butyl rubber or halogenated butyl rubber. If the blending amount is less than 5 parts by weight, it will not be possible to impart appropriate fluidity and flexibility to the adhesive layer, resulting in decreased adhesiveness. Furthermore, if the amount exceeds 200 parts by weight, the heat resistance of the adhesive layer will be reduced.

As the tackifier, which is another main component of the compounded composition, known tackifiers used in general adhesives can be used, such as polyterpenes, rosins and their derivatives, oil-soluble phenolic resins, and adhesives. Examples include marron indene resin and petroleum-based hydrocarbon resin. The blended layer is 10 to 100 parts by weight, preferably 20 to 70 parts by weight, per 100 parts by weight of butyl rubber or halogenated butyl rubber.
Parts by weight. If the amount is less than 16 parts by weight, the adhesion of the adhesive layer will be poor, and if it exceeds 100 parts by weight, the heat resistance of the adhesive layer will be reduced.

The blended composition according to the present invention has the above three components as its main components, and further contains a crosslinking agent and a crosslinking aid for crosslinking the butyl rubber or halogenated butyl rubber, which is one of the main components.

Examples of the crosslinking agent include sulfur, quinone compounds such as dibenzoquinone dioxime and P-quinone dioxime, and metal oxides such as magnesium oxide, as described above. The blending amount is 0.5 parts by weight of butylcomb or halogenated butyl rubber.
~10 parts by weight.

Further, examples of the crosslinking aid include thiazole type, thiuram type, dithiocarbamate type, amine type, etc., and the amount thereof is 05 to 10 parts by weight per 100 parts by weight of butyl rubber or halogenated butyl comb. It is.

If the amount of the crosslinking agent and crosslinking aid is less than the predetermined amount, crosslinking of sticky disease will be insufficient and heat resistance will be poor. Also,
If the blending amount exceeds a predetermined amount, the adhesive layer loses its flexibility and becomes less compatible with the irregularities of the underlying concrete surface, making it impossible to obtain a sufficient bonding area and resulting in a decrease in adhesive strength.

In addition to the above-mentioned components, the blended composition of this invention may include reinforcing agents, fillers, fillers,
Anti-aging agents, softeners, etc. can be added. These compounding amounts are butyl rubber or halogenated butyl rubber 1
The total amount is adjusted to 10 to 200 parts by weight based on 00 parts by weight.

The blended composition obtained as described above is applied to one side or both sides of a polymer sheet body such as an ethylene-propylene terpolymer vulcanized sheet, a vinyl chloride sheet, a polyolefin sheet, or, depending on the application, about 0.05 to 3 times the amount. The waterproof sheet with an adhesive layer of the present invention is obtained by applying the adhesive layer to a thickness and heating it at 90 to 200°C for 0.1 to 10 minutes to crosslink it and form an adhesive layer.

The adhesive layer of the thus obtained waterproof sheet with an adhesive layer has appropriate flexibility and fluidity, so even if the underlying concrete surface is uneven, a conventional adhesive can be applied to the concrete surface. By just using the adhesive, it blends well with the unevenness, and a sufficient adhesive area can be obtained, as well as being highly adhesive and providing sufficient adhesive force. Furthermore, it has excellent heat resistance,
Even when the temperature rises to about 80°C, the sheet does not peel off and the waterproof function does not deteriorate.

In addition, when a foaming agent and a foaming aid are blended into the above-mentioned blended composition, the adhesive layer has a foamed structure, which improves its compatibility with the irregularities of the underlying concrete surface and provides sufficient adhesive strength. However, it is preferable that the foaming ratio is 2 times or less.
If it exceeds this, the interlaminar strength of the waterproof sheet will decrease. Examples include hydrazides such as hydrazide,
The blending proportion of the butyl rubber is 0.1 to 10 parts by weight based on 100 parts by weight of the halogenated butyl rubber.

In addition, the foaming aids include urea salicylate and the like, and the blending amount is as follows:
: 100 parts by weight of l'7-butyl rubber: 0.1-1
0 parts by weight. If the blending amount of both is set within the above range, the foaming ratio will be 2 times or less, which is preferable.

Examples of this invention are shown below.

Examples 1 to 3 The compounded compositions shown in Table 1 were mixed using an open roll, and this was mixed into an ethylene-propylene copolymer-based vulcanized sheet (
It was coated with a calender roll on one side of 1° Orrrm (thickness 1°Orrrm) to a thickness of 0.3 rran in Examples 1 and 2, and to a thickness of 0.2 rm+ in Example 3, and then 180
The mixture was heated at ℃ for 2 minutes to form an adhesive layer, thereby obtaining a waterproof sheet with an adhesive layer.

Table 1 The waterproof sheets obtained in Examples 1 to 3 above were adhered to a slate board and a foamed concrete board coated with a chloroprene adhesive commonly used in roofing to examine their adhesive strength.

The slate board has relatively few surface irregularities, and the foamed concrete board is coated with a surface strength finishing agent (a mixture of latex and cement at a weight ratio of 1:1) of about 200%.
! /m'' was applied and cured to a depth of approximately ITnjn.
There are many unevenness of some degree.

After applying a chloroprene adhesive solution of about 200 F/m (solid content) to the slate board and foam concrete board and drying it, the waterproof sheets of Examples 1 to 3 were applied to a 25 mm x 150
The adhesive force at 0°C is as follows: Cut into pieces of m, pasted at 0°C or 20°C via an adhesive layer, pressed with a 2K9 roller, and then pasted at 0°C.
The adhesion strength (width/2s rrvn) at 20°C and 80°C was measured using a Schottspa tester for those that were attached at 20°C.

The above measurement results are shown in Table 2 below.

As a comparative example, a conventional butyl rubber-based unvulcanized rubber mixture was coated as an adhesive layer on an ethylene-propylene terpolymer-based vulcanized sheet (thickness 1. Orrvn) (Comparative Example 1), and a conventional Table 2 also shows the results of measuring the adhesive strength in the same manner using a product coated with a neoprene adhesive solution (Comparative Example 2). In Table 2, A indicates a slate board and B indicates a foamed concrete board.

As can be seen from the above results in Table 2, when the base surface has relatively few irregularities, a waterproof sheet coated with a conventional pressure-sensitive adhesive has good adhesion, but when the base surface is uneven, such as with a foamed concrete board. If there is a large amount of adhesive, the adhesion area of the waterproof sheet is insufficient and the adhesive force becomes low. It can be seen that when using the waterproof sheet as described above, it is essential to keep the underlying surface smooth.

In addition, for waterproof sheets coated with rubber-based unvulcanized mixtures,
It shows good adhesion regardless of whether the base surface has irregularities, but when the temperature rises, the adhesive strength decreases extremely and the heat resistance is inferior.

On the other hand, when using the waterproof sheet with an adhesive layer of the present invention, it exhibits good adhesion regardless of whether or not the underlying surface is uneven, and it also maintains its adhesion even when the temperature rises and has good heat resistance. It turns out that it is also excellent.

Patent applicant: Nitto Electric Industry Co., Ltd.

Claims (2)

[Claims] (1) Butyl rubber or halogenated butyl rubber 1
A blended composition containing a 0'O heavy background part, 5 to 200 parts by weight of a non-crosslinkable polymeric substance, and 10 to 100 parts by weight of a tackifier, and a crosslinking agent and a crosslinking aid is heated to crosslink it. 1. A waterproof sheet with an adhesive layer, characterized in that a private layer is formed on at least one side of a polymer sheet body. (2) A waterproof sheet with an adhesive layer according to claim (1), wherein the blended composition contains a foaming agent and a foaming aid.