JPH0892449A - Waterproof sheet made from plasticized polyvinyl chloride resin - Google Patents

Abstract

PURPOSE: To obtain a waterproof sheet made from a plasticized polyvinyl chloride resin and having higher weather resistance and persistence of waterproofness than formerly attainable. CONSTITUTION: This sheet is produced from a compsn. prepd. by compounding 100 pts.wt. polyvinyl chloride resin with 50-80 pts.wt. linear phthalic ester. The phthalic ester used is produced by using an alcohol component comprising an alcohol having 9-12 carbon atoms and a linearity of 70% or higher or a mixture of such alcohols.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft polyvinyl chloride resin waterproof sheet stretched on a flat roof of a house, for example.

[0002]

2. Description of the Related Art In recent years, with the increase in the durability of houses, waterproof sheets stretched over the flat roof have been required to have further excellent durability.

Conventionally, as a waterproof sheet of this kind, a polyvinyl chloride resin is blended with a plasticizer such as DOP (di-2-ethylhexyl phthalate) to give a required flexibility, and at the same time, a stabilizer or a filler is added. The most commonly used one is a soft polyvinyl chloride resin based on which the hiding property, the sheet moldability and the weather resistance are improved by compounding the agent.

[0004]

However, the above-mentioned conventional soft polyvinyl chloride resin-based waterproof sheet, when used outdoors for a long period of time, deteriorates its material with time, and is particularly flexible. Damaged, and to a large extent,
There is a drawback that a marked decrease in mechanical strength is observed. Therefore, during long-term use, there is a problem that cracks occur due to the occurrence of local stress, which eventually impairs the waterproof performance, and it is not always possible to obtain sufficient satisfaction in terms of durability. .

The present invention is intended to provide a soft polyvinyl chloride resin-based waterproof sheet having weather resistance and waterproof durability superior to those of conventional products for the purpose of solving the above problems. .

[0006]

As a result of earnest research, the inventors of the present invention have found that deterioration of a waterproof sheet with time is caused by volatilization of a plasticizer. Such volatilization causes the waterproof sheet to be stretched. It was possible to find that it was remarkable in the high temperature range of the environmental temperature range. That is, in a conventional waterproof sheet, a side chain alcohol phthalate ester such as DOP is used as a plasticizer. Generally, the side chain alcohol phthalate ester is remarkably volatilized at a temperature of 70 ° C or higher. It was found that the flexibility of the sheet is lost and the mechanical strength is reduced because the plasticizer in the sheet is reduced.

Based on the above findings, the soft polyvinyl chloride resin waterproof sheet of the present invention can volatilize a plasticizer in an environmental high temperature range of 70 to 100 ° C. by newly selecting and properly blending a phthalic acid plasticizer. It can be suppressed, and is composed of a polyvinyl chloride resin and a single or mixture having a carbon number of the alcohol portion of 9 to 12 and a linearity of 70% or more with respect to 100 parts by weight of the polyvinyl chloride resin. The present invention is characterized in that it is mixed with 50 to 80 parts by weight of a linear alcohol phthalate ester.

In the soft polyvinyl chloride resin-based waterproof sheet of the present invention, the type of the polyvinyl chloride resin as the base is not particularly limited, and is a vinyl chloride monopolymer, or vinyl chloride and vinyl acetate, ethylene, propylene, etc. And a copolymer of two or more of them can be used.

The use of a linear alcohol-based phthalic acid ester having a carbon number of the alcohol portion of 9 to 12 and a linearity of 70 or more as a plasticizer does not easily volatilize even in a high temperature range, and is a waterproof sheet. This is because it has the effect of preventing the deterioration of flexibility over time. Besides, weather resistance, non-migration,
It is also excellent in terms of non-extractability and greatly contributes to preventing deterioration of the material of the waterproof sheet over time. Among alcohol-based phthalates, those having 8 or less carbon atoms in the alcohol portion have a significantly increased volatilization amount at high temperatures, and those having 13 or more carbon atoms have a marked decrease in processability.
Items other than 2 need to be excluded. Also, the linear rate is 7
Those of less than 0% have a large amount of volatilization at high temperature and are inferior in weather resistance, non-migratory property, and non-extractability, and therefore must be excluded. The linear alcohol phthalic acid ester may have any one of alcohols having 9 to 12 carbon atoms, or may be a mixture of two or more thereof. However, at present, straight-chain alcohol phthalates with a single carbon number are expensive to purify and expensive, and even if a mixture is used, it is not different from the single one in terms of volatilization loss of the plasticizer. Is economically advantageous to use.

If the blending ratio of the plasticizer is less than 50 parts by weight with respect to 100 parts by weight of the polyvinyl chloride resin, the plasticizing effect is insufficient, and the required flexibility cannot be imparted to the waterproof sheet. It is inferior in weather resistance, cold resistance, and workability. On the other hand, if the amount exceeds 80 parts by weight, the waterproof sheet cannot have the required tensile strength, and it is economically disadvantageous and costly. Therefore, the mixing ratio of the plasticizer is 1
The amount should be 50 to 80 parts by weight with respect to 00 parts by weight, the preferred lower limit is 60 parts by weight, and the preferred upper limit is 70 parts by weight.

In the blending of the material for the soft polyvinyl chloride resin-based waterproof sheet of the present invention, various additives may be blended in addition to the polyvinyl chloride resin and the plasticizer for the purpose of improving various properties of the waterproof sheet. The main additives are:
Stabilizers and fillers are generally included. As the stabilizer, in addition to organic acid barium salts and organic acid zinc salts that are commonly used for soft polyvinyl chloride resins, organotin stabilizers, which are not commonly used for soft polyvinyl chloride resins, can be used. The filler is preferably added mainly for improving the hiding property of the waterproof sheet, and examples thereof include titanium oxide, calcium carbonate, kaolin clay and the like.
Further, in addition to these additives, an ultraviolet absorber, an antioxidant, a processing aid, a colorant, etc. may be appropriately blended.

The soft polyvinyl chloride resin-based waterproof sheet according to the present invention can be formed into a sheet by a conventional extrusion method by blending the above-mentioned respective material components according to a conventional method.

[0013]

In the soft polyvinyl chloride resin-based waterproof sheet according to the present invention, a straight chain composed of a plasticizer having 9 to 12 carbon atoms in the alcohol portion and having a straight chain ratio of 70% or more is used alone or in a mixture. Since the alcohol-based phthalate ester is blended, the plasticizer is less volatile even at high temperatures. Therefore, the deterioration of flexibility of the waterproof sheet with time is suppressed.

[0014]

EXAMPLES Next, specific examples of the soft polyvinyl chloride resin waterproof sheet of the present invention will be described.

The waterproof sheet is a vinyl chloride monomer 10
The materials shown in Table 1 below were mixed in an amount of 0 part by weight, and the mixture was dry blended with a Henschel mixer, and then extruded according to a conventional method to form a sheet having a thickness of 1.3 mm. did.

[0016]

[Table 1]

[0017]

[Table 2]

The soft polyvinyl chloride resin-based waterproof sheet produced as described above was evaluated for weight loss on heating, initial physical properties, and weather resistance by the following test methods. The evaluation results are also shown in Table 2.

(Loss on heating) A test piece was placed at 70 ° C. or 100
It was heated for 45 days in an oven whose temperature was adjusted to 0 ° C., and the weight loss rate (%) due to volatilization of the plasticizer was measured.

(Initial physical properties) In accordance with JIS A6008, those having a tensile strength of 2000 N / cm ² or more and an elongation of 200% or more were regarded as good, and indicated by "○" in Table 1.

(Weather resistance) A sunshine carbon arc lamp type weather resistance tester (manufactured by Suga Test Instruments Co., Ltd., Sunshine weatherometer WEL-SUN-DC type) was used for 18 minutes in 120 minutes of a spray cycle, and B. P. After conducting a weathering accelerating test for 2500 hours under the condition of T (black panel temperature) 83 ° C., elongation was measured by the same method as in the initial physical property test, and the residual rate (%) from the initial elongation was evaluated.

From the results shown in Table 2, the soft polyvinyl chloride resin-based waterproof sheet of the present invention has almost no volatilization of the plasticizer even at 100 ° C., the elongation does not decrease even under severe conditions, and the weather resistance is excellent. I was able to confirm that

[0023]

As described above, the soft polyvinyl chloride resin-based waterproof sheet of the present invention has 9 to 12 carbon atoms in the alcohol portion based on 100 parts by weight of the polyvinyl chloride resin and polyvinyl chloride resin. In addition, since the linear alcohol-based phthalic acid ester is mixed with 50 to 80 parts by weight of a linear alcohol having a linear ratio of 70% or more, the plasticizer is volatilized even in a high temperature range. It is less, and deterioration in flexibility over time is suppressed. As a result, even if it is used in a harsh environment for a long period of time, it is possible to obtain a waterproof sheet that is excellent in weather resistance without impairing its flexibility, and by extension is excellent in waterproof durability.

Claims (1)

[Claims] 1. A polyvinyl chloride resin and a single or a mixture of 100 parts by weight of the polyvinyl chloride resin, wherein the alcohol portion has 9 to 12 carbon atoms and the linearity is 70% or more. A soft polyvinyl chloride resin-based waterproof sheet, characterized by being blended with 50 to 80 parts by weight of a linear alcohol-based phthalate ester.