JPS5937377B2 - Unvulcanized rubber sheet suitable for waterproof turning in complex areas - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is suitable for waterproofing sheets for buildings, more specifically, for pasting on complex areas such as projecting corners, entering corners, and around drain pipes in waterproofing building roofs. This invention relates to waterproof rubber sheets.

(Prior Art) Conventionally, in roof waterproofing of buildings, sheet waterproofing or paint film waterproofing has generally been applied to complex areas such as protruding corners, internal corners, and around drain pipes.

Of these, especially in the case of rubber sheet waterproofing, waterproofing is generally done using a vulcanized rubber sheet, but in the case of an unvulcanized rubber sheet, it easily adapts to uneven underlying surfaces. and those with relatively high green strength, such as EVA and PVC.The former is suitable for construction in complex areas, but it is difficult to use in cases where cracks occur in the base due to the poor rubber properties of the sheet after construction. There is a risk that the rubber sheet may be cut due to a phenomenon called netting, in which the rubber sheet at the cracked portion is stretched and becomes thinner.

On the other hand, in the case of the latter, that is, in the case of PVC and vulcanized rubber sheets, repulsion occurs in the corners and recesses of complex locations, so it is especially difficult to bond them to the base using adhesives at the construction site. Although it is preferred,
The performance of such rubber sheet construction is usually greatly influenced by the skill level of each person performing the construction, and especially when the rubber sheet is pasted under tension, it may cause lifting or peeling at the joints due to changes over time. It is normal for this to occur.

Furthermore, even when using auxiliary materials such as sealants and unvulcanized rubber tape, the joints may lift or peel unless the rubber sheet is sufficiently relaxed, which can cause water leakage. It is something we experience every day. As mentioned above, the current waterproof rubber sheets have some disadvantages as materials for waterproofing roofs, especially complex areas, and despite the strong desire for improvement, there are still unsatisfactory waterproof rubber sheets. has not yet been provided.

(Purpose of the Invention) In view of the above-mentioned circumstances, the present invention focuses on the composition and characteristics of a waterproof sheet, and enables easy and complete adhesion to the underlying surface during waterproofing of complex parts of buildings. The purpose is to do so.

(Structure of the Invention) The present invention for achieving the above object is characterized in that an unvulcanized rubber sheet containing a vulcanizing agent, a vulcanizing aid, etc. Vulcanizable, that is, natural vulcanization by solar heat for waterproofing roofs, and a film viscosity (MLl + 5,100'C) of 45 to 70 when applied to the base surface. The point is that

Here, the low unsaturated rubber component used in the present invention is an ethylene-propylene terpolymer (EPT) with excellent weather resistance.
Alternatively, it is preferable to use a blend of EPT and butyl rubber (IIR).
A vulcanization aid is mixed and blended.

The above vulcanizing agent is sulfur-based, P-quinone dioxime (GMF)
Examples of resins include olefin, phenol, and xylene resins, which are appropriately selected and used depending on the type of unvulcanized rubber sheet. However, the most common ones are sulfur-based and GMF-based. In addition, vulcanization aids mainly include vulcanization accelerators, such as test latium monsulfide (TTM), lead peroxide, tritan base, etc.
All known vulcanization accelerators are included, but superaccelerators may also be used.

The usual formulation for the unvulcanized rubber sheet of the present invention is a mixture of 1 to 6 parts by weight of a vulcanizing agent and 2 to 10 parts by weight of a vulcanization accelerator to 100 parts by weight of rubber, and within this range. Use as appropriate.

Thus, the unvulcanized rubber sheet of the present invention having the above-mentioned composition is constructed by the same operation as the conventional unvulcanized and vulcanized rubber sheet, but as described above, the film material used during construction is It is important that the viscosity (MLl + 5,100℃) is 45 to 70, and after it is attached to a wood or metal substrate, the viscosity increases due to natural vulcanization by solar heat, and it becomes resistant to external damage. This is a vulcanized rubber sheet that can increase the viscosity and sufficiently protect the base. In addition, when applying the unvulcanized rubber sheet of the present invention to a wood or metal substrate, the viscosity (MLl+5,1000C) is particularly set at 45 to 7.
The reason for limiting the value to 0 is that when the viscosity is 45 or less, the netting phenomenon occurs, which is a region where the physical properties of the rubber are poor, which can lead to the risk of cracking the base and cutting the rubber sheet, and when the viscosity is 70 or more, the base surface of corners and recesses in complex areas becomes a problem. We have clearly detected that this is the region where the rebound elasticity is large, that is, the cause of the drawback of the prior art. [Viscosity (MLl+5,
This is because I was acutely aware that a temperature of 45 to 70 (100°C) is important.

Therefore, by using the unvulcanized rubber sheet of the present invention, it is possible to prevent the netting phenomenon, that is, the cutting of the rubber sheet due to cracks in the base, and it is also possible to sufficiently adapt to the base surface of complicated places.

In particular, after being adhered to the base surface, the viscosity increases due to vulcanization by solar heat, the elongation rate of the rubber physical properties decreases, and the tensile force increases, so the tension across the entire surface of the rubber sheet also increases. Even if there is a slight floating distortion of the rubber sheet, it will be corrected naturally after vulcanization, that is, it is possible to easily and completely perform waterproofing without requiring any skill.
Furthermore, it goes without saying that the unvulcanized rubber sheet of the present invention is also suitable for construction on ordinary flat substrate surfaces other than complex parts of buildings. In addition, when joining the unvulcanized rubber sheets of the present invention to each other, it is only necessary to apply an aromatic hydrocarbon solvent such as toluene to the joining part and join them, as in the case of conventional ones, and the rest is done by applying solar heat. It is an unvulcanized rubber sheet that further strengthens the bond through natural vulcanization.

(Example) Hereinafter, an example of construction using the sheet of the present invention will be described with reference to the attached drawings.

(Example 1) The unvulcanized rubber sheet composition shown in Table 1 was kneaded in a Banbury mixer to obtain a sheet having a thickness of 1.2 to 2.0 mTfL.

However, in the summer, the surface of the unvulcanized rubber sheet reaches 70 to 80 degrees Celsius due to direct sunlight, so the unvulcanized rubber sheet is placed in an oven for 70 years. The changes in physical properties over time were investigated after storage.

The results are shown in FIGS. 1 and 2. Figure 1 shows the change in physical properties due to vulcanization at 80°C, and Figure 2 shows the change in physical properties due to vulcanization at 70°C.As can be seen from both figures, the tensile strength (white dots) of the unvulcanized rubber sheet was measured. The elongation (line with black dots) sharply rises from day 1 to 5 of the elapsed days on the horizontal axis, and the elongation (line with black dots) on the contrary decreases, and is close to that caused by solar heat.

The tensile strength and elongation were measured using No. 3 tamper test pieces according to JIS K-6301. Next, the unvulcanized rubber sheet 1 having a viscosity (MLl+5, 10'C) of 55 is adhered to the base surface of the wood 2 having corners as shown in FIG. After curing for 1 day and night, put it in a gear oven at 8'C and check the raised state of the corners after vulcanization of the unvulcanized rubber sheet and the shrinkage of the rubber sheet (100 mm between marked lines).
When the condition of TIL0A "D" was examined, no lifting of the rubber sheet was observed with the naked eye, and no shrinkage of the rubber sheet was observed.

As is clear from the above table, when the unvulcanized rubber sheet of the present invention is applied, it is found that the unvulcanized rubber sheet of the present invention is naturally vulcanized while fully blending into the irregularities of the base.

(Example 2) As shown in FIG. 4, toluene was applied to the joint portion of the unvulcanized rubber sheet, and after drying to the touch, the joint was performed.
After curing for 1 day and night at 25°C, they were stored in an 80°C dry oven and 70°C warm water, and after a few days, a shear peel test was performed using JISK-6301 (500 dragon tensile speed). As a result, the rubber sheet broke in both cases. .

As described above, the viscosity of the present invention (MLl+5,10
An unvulcanized rubber sheet mainly composed of EPT of 45 to 70 has good adhesion to wood or metal substrates when waterproofing complex parts of buildings, especially building roofs.
In addition, due to its ability to be naturally vulcanized by solar heat, it is possible to prevent base cracks, which are problems with conventional unvulcanized and vulcanized rubber sheets, as well as sheet breakage due to residual air expansion inside the sheet. Improved adhesion by eliminating lifting and peeling at joints, eliminating concerns about water leakage, etc.
In addition, as can be seen from the above examples, the tensile strength of the sheet increases rapidly within a short period of 1 to 5 days, and the base can be quickly protected, making it possible to perform waterproofing easily and completely. It has excellent effects.

[Brief explanation of drawings]

Figures 1 and 2 show 8'C and 70' of unvulcanized rubber sheets.
3 is a perspective view showing the state of adhesion of the unvulcanized rubber sheet to the base corner in Example 1, and FIG. 4 is Example 2. It is a perspective view of the unvulcanized rubber sheet joint part in .

Claims (1)

[Claims] 1 A rubber sheet that is applied to the wood or metal base of the waterproofing area of a building and is vulcanized using solar heat, and the sheet is made of ethylene propylene terpolymer or a blend of ethylene propylene terpolymer and butyl rubber. Contains curing agents and vulcanization aids, etc., and can be naturally vulcanized at temperatures above 60°C, and has a Mooney viscosity (ML) of
_1_+_5, 100°C) of 45 to 70, an unvulcanized rubber sheet suitable for waterproofing construction of complex areas.