JP2698474C - - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a synthetic polymer roofing material that can be used for outdoor roof waterproofing work, indoor water storage tanks, pools, heat storage tanks, and the like. (Prior Art) Conventionally, asphalt roofing materials, synthetic polymer roofing materials, and the like have been used for waterproofing general buildings and civil engineering structures. Since the roofing material is mainly installed outdoors, it has good weather resistance and heat resistance, and has a small expansion and contraction in a wide temperature range from low to high, and is flexible even at low temperatures. , Mechanical strength and elongation are required. In addition, when the roofing material is applied, the joining property between the sheets is also required. Asphalt roofing materials have occupied the mainstream of waterproofing work for many years, but there are many work environment problems and the number of work processes associated with the use of fire in the hot work method, and physical property changes due to changes in outside temperature are large. There are many other problems, such as difficulty in construction on steep slopes. Synthetic polymer roofing materials have been developed to improve these drawbacks. As such synthetic polymer roofing materials, vulcanized rubbers, non-vulcanized rubbers, polyvinyl chloride resins and the like are mainly used. (Problems to be Solved by the Invention) However, vulcanized rubber-based roofing materials have excellent mechanical strength, but have problems in bonding between sheets, and non-vulcanized rubber-based roofing materials have an internal stress relaxation. Although the construction is relatively easy and the sheet followability is excellent, the mechanical strength is weak and a protective layer is required in a place where an external force such as walking is applied. Although a polyvinyl chloride resin-based roofing material has excellent bonding properties and mechanical strength, it is generally exposed to outdoors for a long period of time because a small molecular weight plasticizer such as a small molecular weight phthalate ester plasticizer is used. During this time, a change in weight, a change in dimensions, etc. of the sheet due to the disappearance of the volatilization of the plasticizer occurs, and as a result, the weak point portion is broken due to the curing and shrinkage of the sheet, and the waterproof function is impaired. Therefore, an object of the present invention is to solve the above problems of the polyvinyl chloride resin-based coated waterproof sheet material, and the migration, leaching, and volatilization of the plasticizer even when used outdoors for a long time. An object of the present invention is to provide a polyvinyl chloride resin-based synthetic polymer-based roofing material which is low in stability, excellent in stability and mechanical strength. (Means for Solving the Problems) The present invention is a synthetic polymer-based roofing material comprising an additive and a synthetic polymer base, wherein the synthetic polymer base has an average degree of polymerization of 1,000 to 4,000. It comprises a vinyl homopolymer resin base alone and the additive is a high molecular weight phthalate plasticizer having an average molecular weight of 450 to 620, or a saturated polyester plasticizer having an average molecular weight of 2600 to 6000 and 450 to 620. A high molecular weight phthalate plasticizer having an average molecular weight, wherein the high molecular weight phthalate plasticizer is from the group consisting of undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol and hexadecanol. It is synthesized from the selected higher alcohol and phthalic acid, and 30 to 90 parts by weight based on 100 parts by weight of the vinyl chloride homopolymer resin base. Wherein the plasticizer is added, it relates to a synthetic polymer roofing materials. The vinyl chloride resin used for the synthetic polymer roofing material of the present invention has an average degree of polymerization of 1,000 to 4,000. When the average degree of polymerization is lower than 1,000, the mechanical strength of the material is reduced, and when the average degree of polymerization is higher than 4,000, the workability of the material and the associated economic efficiency are reduced. The polyester plasticizer used in the present invention includes succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, dicarboxylic acids such as sebacic acid and phthalic acid and ethylene glycol, 1,2-propanediol, 1 , 3-propanediol, 2-methyl-2-ethyl-1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 2 , 2-Dimethylpropane-1,3-diol, 1,4-pentanediol, 1,6-hexanediol, 2-methyl-2
Polyester plasticizer having an average molecular weight of 2600 to 6000, which is arbitrarily synthesized from various glycols such as 1,4-pentanediol, diethylene glycol and triethylene glycol. If the average molecular weight exceeds 6000, the workability of the resulting material, cold resistance, poor compatibility, if less than 2600 plasticizer migration, leaching, volatilization,
This is because the durability under severe conditions such as long-term outdoor exposure, that is, the waterproof function is reduced. The high molecular weight phthalate ester plasticizer used in the present invention has an average molecular weight of
450-620. When the average molecular weight exceeds 620, the processability and compatibility of the obtained material are poor, and when the average molecular weight is less than 450, migration, leaching and volatilization of the plasticizer increase,
The durability under severe conditions such as long-term outdoor exposure, that is, the waterproof function is reduced. The high molecular weight phthalate plasticizer is an alcohol having 11 to 16 carbon atoms, that is, 1-undecanol (11 carbon atoms), 1-dodecanol (12), 1-tetradecanol (14), 1- An alcohol selected from higher alcohols such as hexadecanol (16) and higher alcohols having different hydroxyl substitution positions, which are isomers thereof,
It is synthesized from phthalic acid. One or more plasticizers selected from the group consisting of the above-mentioned polyester plasticizers and the above-mentioned high molecular weight phthalate esters are added in an amount of 30 parts by weight or more and 90 parts by weight or less based on 100 parts by weight of the vinyl chloride resin. If the addition amount is less than 30 parts by weight, the sheet becomes hard and has low elongation, which is poor in workability and may cause stiffening at a low temperature to cause trouble. If the amount is more than 90 parts by weight, the mechanical strength of the sheet becomes small, and the strength is remarkably reduced particularly at a high temperature such as in summer, and there is a possibility that an external force may be applied to the sheet to cause trouble. Further, in the synthetic polymer roofing material of the present invention, if necessary, stabilizers, fillers, pigments, processing aids, and the like used in ordinary soft polyvinyl chloride resin compositions can be used. (Function) The synthetic polymer roofing material of the present invention uses a high molecular weight phthalate ester plasticizer, or a polyester plasticizer and a high molecular weight phthalate ester plasticizer, or four large molecular weight plasticizers. Therefore, compared with general polyvinyl chloride-based waterproofing sheet materials that use small molecular weight plasticizers such as general-purpose phthalate ester plasticizers, they have excellent mechanical strength and plasticity under severe conditions such as long-term outdoor exposure. The sheet is stable without any hardening or shrinkage of the sheet caused by a change in weight or dimensional change of the sheet due to migration, leaching, volatilization, etc. of the agent. Thus, the synthetic polymer-based roofing material of the present invention is a plasticizer migration, leaching,
Since there is little volatilization, it can be installed by directly contacting the sheet on the asphalt waterproof layer or the foamed styrene insulation board, and it can be used like a general polyvinyl chloride waterproof sheet material using a general low molecular weight phthalate ester plasticizer. In addition, there is no need to use an insulating film or an insulating sheet, and the material and the steps at the time of construction can be omitted. In addition, the synthetic polymer roofing material of the present invention has little curing and expansion and contraction even when used for many years, and has a stable mechanical strength, so that it can maintain the bonding property between sheets for a long time, and can be partially repaired. It is easy to maintain and very easy to maintain. Hereinafter, the present invention will be described with reference to the following examples and comparative examples. Preparation of coated waterproof sheet In the proportions shown in Table 1, polyvinyl chloride was used alone with various polyester plasticizers (Test Examples 1 to 3) and a high molecular weight phthalate ester plasticizer (here, DUP: phthalic acid). Diundecyl) (alone) (Example 1) and a combination of a polyester plasticizer and a high molecular weight phthalate plasticizer (here, DUP: diundecyl phthalate) (Example 2). A compound was produced using a shell mixer, and the compound was extruded into a 1.5 mm thick sheet using a 110 mm bidirectional twin screw extruder. For comparison, a general-purpose small-molecular-weight phthalate-based plasticizer (here, DOP: di (2-ethylhexyl) phthalate and DINP: diisononyl phthalate) was blended with polyvinyl chloride by the same production method as described above. And made a similar sheet. Table 1 shows these compounding ratios. * 1 Polyvinyl chloride: Suspension polymerized polyvinyl chloride resin with average polymerization degree P = 1300 * 2 Polyester A: Adipic acid-1,6-hexanediol average molecular weight 26
Polyester plasticizer of 00 * 3 Polyester B: adipic acid-neopentyl glycol polyester plasticizer of average molecular weight 2600 * 4 Polyester C: 1,6-hexanediol sebacic acid Average molecular weight 60
Polyester plasticizer of 00 * 5 Ultraviolet absorber: Tinuvin P (Triazole-based ultraviolet absorber manufactured by Ciba Geigy) * 6 Polyethylene wax: Low-density polyethylene wax * 7 Pigment: 0.5 parts by weight of chlorinated rutile type titanium oxide, carbon black 0.5
Parts by weight * 8 Calcium carbonate: Shirayuka cc (manufactured by Shiraishi Industry Co., Ltd.) The molecular weight of the phthalate plasticizer is as follows. DUP: 474 DOP (Comparative Example): 390 DINP (〃): 418 Each of the obtained sheets is subjected to a tensile test according to JIS-A 6008 (synthetic polymer roofing) to obtain a tensile strength, a tensile elongation, and 100%. Measure the modulus, and
The hardness was measured according to JIS-K 6301 (vulcanized rubber test method), and the results shown in Table 2 were obtained. Next, samples were taken from sheets belonging to the same lot as each sheet subjected to the above test, and these were collected by Suga Test Instruments Co., Ltd. Super Long Life Weather Meter (WEL-SUN).
-HCH-B) for 9000 hours under the irradiation conditions of JIS-A 1415 (Accelerated exposure test method for plastic building materials), and conduct tensile tests based on JIS-A 6008 to determine the tensile strength and tensile elongation. The hardness was measured based on JIS-K 6301, and these values were expressed as a percentage of the values of physical properties at room temperature.
The results shown in the table were obtained. Next, JIS-K 63
Punched into a dumbbell-shaped No. 3 shape specified in 3.2 of 01, subjected to air heating aging treatment based on JIS-K 6301 at a heating temperature of 80 ± 2 ° C, heating days of 100 days, 200 days, and 300 days. The volatile weight loss due to the heat aging treatment expressed as a percentage of the original test piece weight was defined as the volatile loss I. In addition, a tensile test is performed based on JIS-A 6008, tensile strength and tensile elongation are measured, and a hardness measurement is performed based on JIS-K 6301.These values are expressed as percentages of untreated normal physical properties. The resulting material was designated as a heat aging property retention ratio I, and the results shown in Table 4 were obtained. Further, for each sheet belonging to the same lot as each sheet subjected to the above test, a test similar to the test whose test results are shown in Table 4 was performed. However, the heating temperature of each sheet was set to 125 ± 2 ° C., and the number of heating days was 15 days and 30 days. In this way, the loss on evaporation II and the retention of heat aging properties II were measured for each sheet according to the method shown in Table 4, and the results shown in Table 5 were obtained. However, the heat aging retention rate II of 125 ° C. × 30 days in Comparative Example 1 in the above table was too hard to cure due to the heat aging of the sample, and the sheet became brittle, and could not be measured. (Effect of the Invention) As described above, the soft polyvinyl chloride composition as the synthetic polymer roofing material of the present invention has good weather resistance, heat aging resistance, and volatilization loss in addition to room temperature physical properties. Under severe conditions such as outdoor exposure for a long period of time, it has features such as stable dimensions and physical properties, and good mechanical strength and elongation in a wide temperature range from low to high temperatures. Therefore, the synthetic polymer roofing material of the present invention,
It is effective not only for rooftop waterproofing but also for applications requiring high performance such as indoor water storage tanks, pools, and heat storage tanks, and is particularly effective as a coated waterproof sheet material that is exposed for long periods under severe outdoor conditions.

Claims (1)

[Claims] 1. A synthetic polymer-based roofing material comprising an additive and a synthetic polymer base, wherein the synthetic polymer base comprises only a vinyl chloride homopolymer resin base having an average degree of polymerization of 1,000 to 4,000, and the additive Is a high molecular weight phthalate plasticizer having an average molecular weight of 450 to 620, or a saturated polyester plasticizer having an average molecular weight of 2600 to 6000 and a high molecular weight phthalate ester plasticizer having an average molecular weight of 450 to 620. Wherein the high molecular weight phthalate plasticizer is synthesized from a higher alcohol selected from the group consisting of undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol and hexadecanol and phthalic acid. Wherein 30 to 90 parts by weight of the plasticizer is added to 100 parts by weight of the vinyl chloride homopolymer resin base. To, synthetic polymer-based roofing materials.