JPH01262130A - Manufacture of heat-insulating colored waterproof rubber sheet - Google Patents

Abstract

PURPOSE:To obtain excellent weather resistance, waterproofing, mechanical characteristics and heat-insulating properties by superposing a non-crosslinking colored chlorine-containing polyethylene sheet to an unvulcanized black ethylene propylene rubber sheet and vulcanizing both sheets and heat-fusing an expanded polyolefin sheet to the black ethylene-propylene rubber sheet side. CONSTITUTION:An unvulcanized black ethylene-propylene rubber sheet 2 is extruded, and an unvulcanized red chlorosulfonated polyethylene rubber sheet 4 is superposed on the top face side of the rubber sheet 2, and contact-bonded by a preheating roller 5, thus acquiring an unvulcanized black ethylene-propylene rubber sheet 21. The rubber sheet 21 is pressed in a vulcanizing device 6 at pressure of 1.0kg/cm<2> and a temperature of 180 deg.C, thus obtained a red chlorosulfonated polyethylene rubber sheet 4 bonded black ethylene-propylene group rubber sheet 22. Lastly, the sheet 22 is fed to the heating roll 18 side of a fusion press roll 8 and an expanded polyethylene sheet 7 to the cooling roll 82 side, and heat-fused, thus acquiring a heat-insulating colored waterproof rubber sheet 23.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a heat-insulating colored waterproof rubber sheet.

[Conventional technology] In recent years, waterproof structures for buildings have become waterproof and weatherproof.

Insulating properties and cosmetic properties are increasingly required.

A heat insulating and waterproof rubber sheet as shown in FIG. 3 has been put into practical use as a sheet that satisfies these requirements.

In Fig. 3, 2 is a waterproof rubber sheet layer made of a vulcanized black ethylene propylene rubber sheet, etc., and 8 is a heat insulating polyolefin sheet layer made of a foamed polyethylene sheet, etc., and both are integrated by heat fusion. is normal.

The reason why a black ethylene propylene rubber sheet, which has poor cosmetic properties, is used as the waterproof rubber sheet layer 2 is that a black carbon black compound exhibits the most excellent weather resistance, water resistance, and mechanical properties.

However, it cannot be denied that the black ethylene propylene rubber sheet 2 naturally has poor cosmetic properties.

For this reason, in conventional waterproofing work using waterproof rubber sheets,
After a heat insulating and waterproof rubber sheet is installed on a construction surface such as concrete, colored paint is applied to the black ethylene propylene rubber sheet 2 to form a colorful colored coating film.

However, this colorful paint film with excellent cosmetic properties has poor weather resistance, and has the disadvantage that it fades or partially peels off within 1 to 2 years after being applied, significantly impairing its cosmetic appearance.

Therefore, the lower black ethylene propylene rubber sheet 2
It is necessary to apply colored paint on the top about once every two years, which is problematic in terms of painting cost and cosmetic retention.

As a countermeasure to this problem, ethylene/propylene rubber itself is colored and vulcanized sheets are used in some cases, but this is still insufficient in terms of weather resistance.

On the other hand, since ethylene polymers containing chlorine (hereinafter referred to as chlorine-containing ethylene polymers)9, such as chlorosulfonated polyethylene rubber and chlorinated polyethylene, have excellent weather resistance, colored sheets using these as base polymers have been developed. Although these are being used as a single sheet, they are not suitable for use as a laminated sheet with foamed polyolefin.

That is, while foamed polyolefin is a typical non-polar polymer, chlorine-containing ethylene polymer is a polar polymer, and therefore it is fundamentally impossible to integrate them by heat fusion due to the difference in polarity. The reality is that in many cases adhesives are used.

However, the use of adhesives involves many complicated factors such as adhesive formulation, viscosity control, the need for drying equipment, and safety measures against solvents. There was a strong desire to establish a lamination technology for heat-insulating colored waterproof rubber sheets.

[Problems to be Solved by the Invention] The present invention has been made based on this point, and its purpose is to eliminate the drawbacks of the prior art mentioned in the previous two,
It is an object of the present invention to provide a method for manufacturing a heat-insulating colored waterproof rubber sheet that has excellent weather resistance, water resistance, mechanical properties, heat insulation properties, and cosmetic maintenance properties.

[Means for solving the LI problem] The gist of the heat-insulating colored waterproof rubber sheet of the present invention is to add an uncrosslinked colored chlorinated polyethylene sheet to an unvulcanized black ethylene propylene rubber sheet extruded from an extruder. The colored chlorine-containing polyethylene sheet is then vulcanized by passing through a vulcanization device that applies heat and pressure to form a black ethylene propylene rubber sheet, which is then foamed on the side of the black ethylene propylene rubber sheet. This is a heat-sealed, colored waterproof rubber sheet made by heat-sealing polyolefin sheets.

In the present invention, the unvulcanized black ethylene propylene rubber sheet is a rubber compound made by blending appropriate amounts of a vulcanizing agent, a vulcanization accelerator, a lubricant, an anti-aging agent, a carbon black reinforcing agent, etc. with ethylene propylene rubber. A product extruded by an extruder to a predetermined width and thickness, the width of which is several 1.0 to 1.5'rrL1, and the thickness of which is approximately 0.1 to 1.8 m+. be.

In the present invention, the uncrosslinked colored chlorinated polyethylene sheet is polyethylene containing chlorine in the main chain or side chain of the molecule, such as chlorosulfonated polyethylene rubber, chlorinated polyethylene, and the like. This uncrosslinked colored chlorine-containing polyethylene sheet has the same width as the unvulcanized black ethylene propylene rubber sheet, and its thickness is 1.8 to 0.1 m.
It is of a certain degree.

In the present invention, in order to adhere an uncrosslinked colored chlorine-containing polyethylene sheet to one side of a high-temperature unvulcanized black ethylene propylene rubber sheet immediately after being extruded from an extruder, a pair of preliminary pressure rolls is often used. Let it pass. The temperature of the preliminary pressure roll is not particularly limited, but it is desirable that the uncrosslinked colored chlorinated polyethylene sheet not undergo thermal deformation;
Moreover, a suitable temperature is such that vulcanization of the unvulcanized black ethylene propylene rubber sheet and crosslinking of the uncrosslinked colored chlorine-containing polyethylene sheet do not occur, for example, 10 to 70°C.

In the present invention, the vulcanization device continuously feeds a sheet-like material obtained by pre-pressing an uncrosslinked colored chlorine-containing polyethylene sheet on one side of an unvulcanized black ethylene propylene rubber sheet, pressurizes it, and vulcanizes it. It is something that can be brought out. The temperature of the vulcanizer may be a temperature at which vulcanization of the unvulcanized black ethylene propylene rubber sheet and crosslinking of the uncrosslinked colored chlorine-containing polyethylene sheet occur, for example, 1
A temperature of 20 to 190°C is suitable, and a pressure of at least 0.2 Ky/aJ or more is suitable.

In the present invention, the base polymer for the foamed polyolefin sheet includes polyethylene, ethylene-vinyl acetate copolymer, and the like. These foamed polyolefin sheets may be cross-linked by electron beam irradiation or water cross-linked to improve impact resistance, and in this case, the degree of cross-linking should be limited to an upper limit of about 30% gel fraction from the point of view of thermal adhesiveness. be.

To measure the gel fraction, first, accurately weigh the foamed polyolefin sheet sample using a chemical balance, then immerse the weighed foamed polyolefin sheet sample in hot xylene at 80 to 120°C for a predetermined time, take it out, and dry it. The sample was accurately weighed using a chemical balance, and the percentage of dissolved residue was determined.

Further, in the case of polyethylene, in order to improve impact resistance, ultra-high molecular weight polyethylene having a molecular weight of 2 million or more can be used alone or in a blend.

In the present invention, the foaming ratio of the foamed polyolefin sheet is suitably 20 to 45 times, because if it is too low, the heat insulation properties will be poor, and if it is too high, the mechanical strength will be reduced. From the viewpoint of heat insulation, these foams are preferably closed foams.

Moreover, the thickness of the foamed polyolefin sheet is suitably about 2 to 45 mm in order to exhibit a heat insulating effect.

In the present invention, the thermal adhesion between the vulcanized colored chlorinated polyethylene sheet and the black ethylene propylene rubber sheet and the foamed polyolefin sheet is usually done by heating the rubber sheet side, and the heating temperature is A suitable temperature is above the softening point of the polyolefin, for example in the range of 100 to 160°C.

In the present invention, the rubber sheet side of the vulcanized colored chlorinated polyethylene sheet-adhered black ethylene propylene rubber sheet has just passed through the vulcanization device, so the temperature ranges from 100 to 160°C. No special heating process is required.

[Function] Now, in the method for producing a heat-insulating colored waterproof rubber sheet of the present invention, the colored chlorine-containing polyethylene sheet and the black ethylene propylene rubber sheet are inherently difficult to bond due to their polarity differences.

Therefore, until now, there have been very few cases in which the two have been integrated without adhesive.

The most significant feature of the present invention is that these two materials can be completely bonded together, thereby completely heat-sealing the black ethylene propylene rubber sheet and the foamed polyolefin sheet, which have the same polarity and are compatible. This has become possible.

That is, the method for manufacturing the heat-insulating colored waterproof rubber sheet of the present invention is as follows:
Surprisingly, by stacking a black ethylene propylene rubber sheet and a colored chlorine-containing polyethylene sheet in an unvulcanized or uncrosslinked state and introducing them into a vulcanization device that applies pressure and heat, they can be bonded to each other. It is possible to strongly integrate the black ethylene propylene rubber sheet and the colored chlorine-containing polyethylene sheet, which have opposite polarities. Effectively, a foamed polyolefin sheet with excellent heat insulation properties is heat-fused to the black ethylene propylene rubber sheet side, and as a result, one side of the black ethylene propylene rubber sheet with excellent weather resistance has a weather resistant and This is the first to obtain a heat-insulating colored waterproof rubber sheet made by completely heat-sealing a colored chlorinated polyethylene sheet with excellent stability and a foamed polyolefin sheet with excellent heat-insulating properties on the other side.

[Example] Next, an example of the method for manufacturing a heat-insulating colored waterproof rubber sheet of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory view showing one embodiment of the method for manufacturing a heat-insulating colored waterproof rubber sheet of the present invention.

First, an unvulcanized black ethylene propylene rubber sheet 2 having a thickness of 0.2 m and a temperature of 60°C is extruded from an extruder 1, and the upper surface side of the unvulcanized black ethylene propylene rubber sheet 2 having a temperature of 60°C is colored. An unvulcanized red chlorosulfonated polyethylene rubber sheet 4 with a thickness of 0.711 wI pulled out from the sheet bobbin 3 was attached, and then 0.06 Ng/25
Pass through preheated rolls at a pressure of m+ and press together,
An unvulcanized black ethylene propylene rubber sheet 21 was obtained by pressing an unvulcanized red chlorosulfonated polyethylene rubber sheet 4 onto the upper surface.

Next, an unvulcanized black ethylene propylene rubber sheet 21 with an unvulcanized red chlorosulfonated polyethylene rubber sheet 4 crimped onto the upper surface thereof was placed at a pressure of 1.0 Ky/~ and a temperature of 18
The vulcanized red chlorosulfonated polyethylene rubber sheet 4 is bonded to the black ethylene propylene rubber sheet 22 by passing through a vulcanizer @ 6 at 0°C.

Here, the red chlorosulfonated polyethylene rubber sheet bonded black ethylene-buO-pylene rubber sheet 22, which was vulcanized immediately after A 5'A in the vulcanization chamber @ 6, has a temperature of 130°C on the black ethylene-propylene rubber sheet side. .

At the top, there is a heating roll 81 at 130°C on the top, and a heating roll 25 on the bottom.
A vulcanized red chlorosulfonated polyethylene rubber sheet with a surface temperature of 130° C. is attached to a black ethylene propylene rubber sheet 22 on the heating roll 81 side of the fused pressure roll 82 which serves as a cooling roll 82 at 130° C. Further, a foamed polyethylene sheet 7 with a foaming ratio of 30 times and a thickness of 45aI drawn from a foamed sheet bobbin (not shown) is fed to the cooling roll 82 side, and the surface of the foamed polyethylene sheet 7 is thermally softened to form a black ethylene propylene rubber sheet surface side. Heat fused to.

Figure 2 shows the heat-insulating colored waterproof rubber sheet 23 obtained in this way.
This figure shows a cross-sectional view of.

In FIG. 2, 2 is a vulcanized black ethylene propylene rubber sheet, 4 is a vulcanized red chlorosulfonated polyethylene rubber sheet, and 7 is a foamed polyethylene sheet.

Table 1 shows the interlayer adhesion between the vulcanized black ethylene propylene rubber sheet 2 and the vulcanized red chlorosulfonated polyethylene rubber sheet 4 and the vulcanized black ethylene propylene rubber sheet 2 for the thus obtained heat-insulating colored waterproof rubber sheet 23. The interlayer adhesion between the foamed polyethylene sheet 7 and the foamed polyethylene sheet 7 was determined.

The comparative example is a heat-insulating waterproof rubber sheet made by heat-sealing a foamed polyethylene sheet made of the same material as an example of the present invention to a 1.2 m thick red chlorosulfonated polyethylene sheet under the same conditions.

Table 1 Interlayer adhesion strength of heat-insulating colored waterproof rubber sheet Notes (1) Interlayer adhesion strength is
The maximum delamination value was determined by pulling and peeling at a tensile speed of 0.00 am/min.

(2) The reason why the interlayer adhesion force is "unmeasurable" is because when the two-layer sheet is peeled off by pulling it in a 180° direction at a pulling speed of 200 m/min, the interlayer adhesion force is too strong. This indicates that the vulcanized black ethylene propylene rubber sheet 2 has broken.

As is clear from Table 1, the heat insulating colored waterproof rubber sheet obtained by the method for producing a heat insulating colored waterproof rubber sheet of the present invention, the black ethylene propylene rubber sheet 2 and the red chlorosulfonated polyethylene rubber sheet 4 are It is strongly vulcanized and bonded, and is also strongly heat-sealed to the black ethylene buO pyrene rubber sheet 2 and the foamed polyethylene sheet 7.
As a result, these three elements are integrated to exhibit excellent adhesive properties, mechanical properties, weather resistance, water resistance, heat insulation properties, etc. Moreover, the red chlorosulfonated polyethylene rubber sheet 4 on the negative side is colored. is clear and exhibits excellent cosmetic properties.

[Effect of the invention] According to the method for producing a heat-insulating colored waterproof rubber sheet of the present invention,
A black ethylene propylene rubber sheet and a colored chlorine-containing polyethylene sheet, which had traditionally been difficult to laminate together due to their different polarities, are strongly adhered, and the other side of the black ethylene propylene rubber sheet is colored and chlorine-containing. By heat-sealing polyethylene sheets, a heat-insulating colored waterproof rubber sheet that exhibits excellent weather resistance, water resistance, mechanical properties, heat insulation and cosmetic properties is obtained through the synergistic effect of these three elements. Industrially useful.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of the method for producing a heat-insulating colored waterproof rubber sheet of the present invention, and FIG. 2 is an explanatory diagram showing an example of the method for producing a heat-insulating colored waterproof rubber sheet of the present invention. A cross-sectional view of a waterproof rubber sheet. FIG. 3 is a cross-sectional view of a conventional heat-insulating waterproof rubber sheet. 1: Extruder, 2: Unvulcanized black ethylene propylene rubber sheet, 3:
Colored sheet bobbin, 4: Unvulcanized red chlorosulfonated polyethylene rubber sheet, 5: Preheating roll, 6: Added Ta device, 7: Foamed polyethylene sheet, BL: Fusion pressure roll, 22: Red chlorosulfonated polyethylene Rubber sheet adhesive black ethylene propylene rubber sheet, 23: Insulating colored waterproof rubber sheet. 63.8. 9 2. Title of the invention: Process for producing heat-insulating colored waterproof rubber bands 3. Relationship with the case of the person making the amendment Patent Representative Hiroshi Hashimoto 4 Agent Address: 100
2-1-2-6 Marunouchi, Chiyoda-ku, Tokyo Figures 1 and 2 of the drawings subject to the amendment. 7.Amendment details are as shown in the attached sheet. 8 List of attached documents (1) Attachment (corrected drawings Figures 1 and 2) At least 1 copy
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Claims (1)

[Claims] 1. Add an uncrosslinked colored chlorine-containing polyethylene sheet to the unvulcanized black ethylene propylene rubber sheet extruded from the extruder, and then pass it through a vulcanization device that can apply heat and pressure. A method for producing a heat-insulating colored waterproof rubber sheet, which comprises heat-sealing a foamed polyolefin sheet to the rubber sheet side.