JPH0299543A - Colored waterproof sheet composition - Google Patents

Abstract

PURPOSE:To obtain a colored waterproof composition capable of preventing surface foulings and maintaining bright beautiful appearance by blending a specific substance, colorant and additives in chlorosulfonated polyethylene or chlorinated polyethylene rubber. CONSTITUTION:A colored waterproof sheet composition obtained by blending a required colorant and other additives with (A) >=4% hydrotalcites expressed by formula I and >=20% electrically conductive calcium carbonate prepared by treating surface thereof with an organic substance, such as a quaternary ammonium salt, expressed by formula II (R represents >=1 carbon atoms and covalently bonded to N; X is a compound ionic bonded with a halogen, such as tetrabutylammonium bromide), (B) 4-40% polyethylene glycol ester-based plasticizer or (C) 4-30% acid-modified type low-molecular weight polyethylene.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a color tarpaulin sheet composition that can prevent surface stains and always maintain a clear aesthetic appearance when used as a tarpaulin sheet. .

[Prior Art] For example, a rubber sheet mainly made of ethylene propylene diene (EPDM) rubber was proposed as a waterproof sheet for roofs from an early stage, and the applicant has already had many achievements. Furthermore, many heat-insulating and waterproof sheets made of composites with foamed polymer materials such as foamed polyethylene have already been put into practical use.

Such waterproof sheets are used for long periods in outdoor waste storage facilities, building rooftops, etc., and are required to have excellent weather resistance and mechanical properties. For this reason, black waterproof rubber sheets filled with carbon black, which can impart excellent reinforcing effects and weather resistance to rubber, have conventionally been used as materials for the above-mentioned IIJj water sheets.

However, the above-mentioned black tarpaulin sheet is not a very desirable color from an aesthetic point of view, and recently there has been a trend to use colored tarpaulin sheets instead of the above-mentioned black tarpaulin sheets on building rooftops and artificial ponds for aesthetic purposes. is large.

Traditionally, colored tarpaulin sheets were typically colored by painting, but such a painted finish required repainting after several years, increasing maintenance costs and causing color variations. It is very disgraceful to paint in a way that eliminates it, and there are various problems. In view of this, a composite color waterproof rubber sheet was proposed, in which a color waterproof rubber sheet made of chlorosulfonated polyethylene rubber or chlorinated polyethylene rubber mixed with a coloring agent was adhered to the surface of the above-mentioned black waterproof rubber sheet, and this sheet was put into practical use. It became so.

[Problem to be solved by the invention] This composite color waterproof sheet has excellent weather resistance, clear coloring, and little discoloration. Another problem is that it tends to attract dust and dirt when used for many years, and it has become increasingly clear that the dirt is particularly noticeable after rain and is not aesthetically pleasing.

As a countermeasure against this stain, it is possible to wash the sheet surface, but this increases the cost and may cause pollution problems depending on the detergent used. It is also possible to apply paint to the surface, but it is unavoidable that the cost will be high, and as mentioned above, in the case of paint, there is always the problem that maintenance by repainting is required.

The purpose of the present invention is to solve the problems of the prior art described above,
The object of the present invention is to provide a composition for a color tarpaulin sheet that is extremely superior in its stain prevention effect.

[Means for Solving the Problems] The present invention uses chlorosulfonated polyethylene or chlorinated polyethylene rubber as a material, and contains calcium carbonate which has been surface-treated with hydrotalcites and organic substances to give surface conductivity. Alternatively, a polyethylene glycol ester plasticizer is blended into the above material, or acid-modified low molecular weight polyethylene is blended into the above material.

Chlorosulfonated polyethylene or chlorinated polyethylene rubber is used as a material because these materials have both the properties of rubber and the properties of plastic, and the blending characteristics of colorants are better than other rubbers. This is because not only does it have excellent coloring and vivid coloring, but it also has excellent weather resistance and mechanical properties, which are essential for a waterproof sheet.

Organic Substance Surface Treatment A quaternary ammonium salt compound represented by the following general formula is suitable as a surface treatment substance for calcium carbonate.

(R represents at least one carbon atom, which may be branched or unbranched, saturated or unsaturated, and is covalently bonded to a nitrogen atom, and X is a halogen ionic bonded compound, such as tetrabutyl Examples include ammonium bromide, trimethyloctadecylammonium chloride, benzyltrimethylammonium chloride, trioctylpropylammonium bromide, etc.) The blending amounts of hydrotalcite and the above-mentioned organic surface-treated calcium carbonate are 4 phr or more and 20 phr or more, respectively. shall be. This is because if the amount is less than that, the stain prevention effect will not be observed. As for the upper limit, an appropriate amount may be determined by experiment, taking into consideration the degree of deterioration of mechanical properties due to the addition of these substances.

Further, the amount of polyethylene glycol ester plasticizer blended into the material is in the range of 4 to 40 phr. Below 4phr, there is no stain prevention effect;
Above phr, it begins to bleed onto the rubber surface.
Undesirable.

Furthermore, it is appropriate that the amount of acid-modified low molecular weight polyethylene blended into the material is in the range of 4 to 30 phr.

No stain prevention effect is seen below 4 phr, and 30 phr
This is because the strength decreases significantly above r.

[Function] When the above-mentioned compounded substances are mixed into chlorosulfonated polyethylene or chlorinated polyethylene rubber as described above, it becomes extremely difficult for dust and dirt to stick to it when exposed outdoors, and it lasts for many years. It is possible to maintain a clear color and maintain an excellent appearance.

[Example] The present invention will be described below with reference to Examples.

FIG. 1 is a cross-sectional view of one color sheet 1 made using the composition according to the present invention, and FIG. FIG. 3 is a cross-sectional view showing a composite waterproof sheet obtained by laminating and adhering the foamed polymer sheet 3 to the composite waterproof sheet. FIG.

The manner in which the color sheet according to the present invention is used can be appropriately selected depending on the purpose of use.

Next, we will explain the results of preparing a sample made of TIT's color sheet as shown in FIG. 1 and measuring its stain characteristics due to outdoor exposure.

Example 1 Chlorosulfonated polyethylene was used as the material, and the compounding agents shown in the Examples and Comparative Examples in Table 1, as well as appropriate amounts of vulcanizing agents, vulcanization accelerators, lubricants, anti-aging agents, coloring pigments, etc. were added. This was mixed in a Banbury mixer to form an unvulcanized rubber compound, which was made into a sheet with a thickness of 1.5+ m using a calendar roll, and then the unvulcanized rubber sheet was vulcanized in a high-temperature, high-pressure vulcanization device. , a color tarpaulin sheet.

Comparative Examples 1 to 4 that do not contain hydrotalcite, or Comparative Examples 5 to 7 that do not contain conductive calcium carbonate that has been treated with an organic surface, and even if conductive calcium carbonate that has been surface treated with an organic material is mixed, its amount is small. Comparative example 8
4 ph hydrotalcite does not show any stain prevention performance and stains occur early due to outdoor exposure.
It was found that in Examples 1 to 4, in which 20 phr or more of conductive calcium carbonate which had been surface-treated with an organic material was added, an excellent stain prevention effect was observed and clear colors could be maintained.

Example 2 Chlorosulfonated polyethylene rubber was used as the material, and the compounding agents shown in Table 2 and appropriate amounts of vulcanizing agents, vulcanization accelerators, lubricants, anti-aging agents, coloring pigments, etc. were added, and a Banbury mixer was used. The mixture was kneaded to form an unvulcanized rubber compound. This was made into a sheet with a thickness of 1.5 cm using a calender roll, and then the unvulcanized rubber sheet was vulcanized using a high-temperature, high-pressure vulcanizer, and a color waterproof sheet was formed.

Table 2 shows the results of comparing the stain prevention performance of the color waterproof sheets obtained as described above exposed outdoors.

In Comparative Example 1 in which no ethylene glycol ester plasticizer was blended, stains appeared on the surface at an early stage. In addition, in Comparative Example 2 in which a large amount of the plasticizer was added, bleeding occurred on the surface and the tensile strength and hardness were significantly reduced, resulting in insufficient stain prevention performance. However, in Examples 1 to 4 in which the polyethylene glycol ester plasticizer was blended within the blending range according to the present invention, it was found that all exhibited excellent surface stain prevention performance.

Example 3 Chlorosulfonated polyethylene rubber was used as the material, and the compounding agents shown in Table 3 and appropriate amounts of vulcanizing agents, vulcanization accelerators, lubricants, anti-aging agents, coloring pigments, etc. were added, and a Banbury mixer was used. The mixture was mixed to form an unvulcanized rubber compound. This was rolled to a thickness of 1.5mm using a calendar roll.
The unvulcanized rubber sheet was then vulcanized using a high-temperature, high-pressure vulcanization device to obtain a color waterproof sheet.

Table 3 shows the results of comparing the stain prevention performance of the colored waterproof sheets obtained as described above exposed outdoors.

In Comparative Example 1, which did not contain acid-modified polyethylene, surface staining occurred at an early stage. Furthermore, Comparative Example 2, in which a large amount of acid-modified polyethylene (40 Dhr) was blended, was found to be unfavorable as it had excellent stain prevention performance, but had a large drop in tensile strength.

However, in Examples 1 to 5 according to the present invention, the degree of decrease in tensile strength was small, the mechanical properties were excellent, and
It was also found that the antifouling performance showed very good results.

1: Color sheet, 2: Black ethylene globylene diene rubber sheet - 1-53:
Foamed polymer sheet.

[Effect of the invention 1 As described above, the colored tarpaulin sheet made of the composition of the present invention can effectively prevent stains on the surface of the sheet even when used outdoors for many years, and the sheet always remains clear. It has great industrial significance, as it can maintain its natural color and maintain its environmental aesthetics.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a color sheet made from the composition of the present invention, and Figure 2 is a cross-sectional view of a composite waterproof sheet in which the color sheet of the present invention is laminated and adhered to a black ethylene propylene diene rubber sheet. 3 is a sectional view showing a heat insulating waterproof sheet in which the composite waterproof sheet of FIG. 2 is bonded to a foamed polymer sheet.

Claims (3)

[Claims] (1) Hydrotalcite [Mg_4_. ＿
5Al_2(OH)_1_3CO_3・3.5H_2O
A color waterproof sheet composition comprising 4 phr or more of the following compounds, 20 phr or more of conductive calcium carbonate surface-treated with an organic substance, and necessary colorants and other additives. (2) A color waterproof sheet composition prepared by blending 4 to 40 phr of a polyethylene glycol ester plasticizer and necessary coloring agents and other additives into chlorosulfonated polyethylene or chlorinated polyethylene rubber. (3) Acid-modified low molecular weight polyethylene in chlorosulfonated polyethylene or chlorinated polyethylene rubber
A color waterproof sheet composition containing 30 phr and necessary colorants and other additives.