JPH0657893A - Under roofing material - Google Patents

Abstract

PURPOSE:To make a worker difficult to slip during roofing eliminate the stickiness to shoes bottom and improve nail hole sealing property after the roofing. CONSTITUTION:Rubber asphalt coat layers are formed on both surfaces of a base material impregnated with asphalt, and a mineral matter powder adhered layer or an adhesive layer to which a release paper is temporarily adhered is formed on one surface side of the rubber asphalt coat layer. Onto the other surface side, a resin mixture containing an acrylic ester emulsion, a heating expansion type microsphere, a water repelling agent, a blocking preventing agent is applied through the mineral matter powder adhered layer or a face material followed by heating. Thus, a soft resin film containing hollow microspheres and having blocking preventing effect is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roof underlaying material used for a pitched roof of a house or the like.
Prevents slippage of the asphalt covering layer and the stickiness of the operator's shoe sole even when the temperature of the underlaying material rises due to direct sunlight during construction on a pitched roof of a house, etc. The present invention relates to a roof underlaying material that is excellent in water permeability resistance and nail hole sealability even after construction.

[0002]

2. Description of the Related Art Conventionally, a roof of a general house has been mainly made of asphalt roofing with talc or silica sand adhering to the entire surface as a roof underlaying material. In addition, polyvinyl chloride resin sheets and polyethylene resin sheets have been used.

[0003]

However, in the conventional asphalt roofing, there is a small amount of talc or silica sand adhering to the surface, which is not adhering sufficiently, and is loosened by the operator. It is slippery and dangerous when walking. Further, in the summer, the asphalt is softened due to the high temperature, and there is an inconvenience that the operator's sole is sticky. Furthermore, for polyvinyl chloride resin sheets and polyethylene resin sheets, after applying the waterproof sheet,
Although the pier or the roofing material is nailed, the dimensional stability of these sheets is poor and they tend to shrink, so that the nail holes tend to become large. Moreover, these sheets are slippery, especially if the surface gets wet due to rainfall during construction, which makes them more slippery and dangerous. The present invention was made in order to solve the problems of the above-mentioned conventional under-roofing materials, and at the time of construction, the operator is unlikely to slip, and there is no stickiness to the shoe sole, and the nail hole sealability after construction is high. It is intended to provide an excellent under-roofing material.

[0004]

The roof underlayment material according to the present invention has been made to solve the above-mentioned problems.
A core material impregnated with asphalt is used as a base material, a rubber asphalt coating layer is formed on both surfaces of the base material, and one side of the rubber asphalt coating layer is a mineral powder particle adhesion layer or peeling layer. Form a tacky adhesive layer of paper, and on the other side,
A resin coating containing minute hollow spheres, which is flexible and has an antiblocking effect, is formed via a mineral powder particle adhesion layer or a face material. The resin film is preferably 5 to 60 parts by weight of heat-expandable microspheres, 2 to 20 parts by weight of solid content of a water repellent, and 10 parts by weight of an antiblocking agent with respect to 100 parts by weight of solid content of the acrylic ester emulsion.
90 to 120 after applying a resin mixture containing 40 to 40 parts by weight.
It is formed by heating at 0 ° C. for 5 to 20 minutes. The coating amount of the resin mixture is preferably 15 to 100 g / m ² .

The contents of the present invention will be described in more detail below. The asphalt-impregnated core material that forms the base material in the present invention is a non-woven fabric or woven fabric made of synthetic fibers or glass fibers, or a non-woven fabric and a woven fabric bonded together, and various types generally used for asphalt roofing. Although rug base paper made from rag or waste paper can be used, it is preferable to use a polyester synthetic fiber nonwoven fabric or a glass fiber nonwoven fabric having excellent dimensional stability and corrosion resistance. Examples of the rubber asphalt used in the present invention include those modified by adding styrene synthetic rubber to the asphalt. The amount used is preferably 5 to 15% by weight with respect to the asphalt, and as a result, rubber elasticity can be imparted to the asphalt, and elasticity can be maintained even at low temperatures, so nail hole sealability is improved. Contribute to the retention of. Examples of the styrene rubber include styrene / butadiene rubber, styrene / butadiene / styrene rubber, styrene / isoprene / styrene rubber, styrene / ethylene / butylene / styrene rubber, styrene / ethylene / propylene / styrene rubber, and the like. It can be used preferably.

Mineral powder particles in the deposit layer of mineral powder particles applied on the rubber asphalt coating layer include silica sand, talc,
Calcium carbonate and the like can be mentioned. One side of the rubber asphalt coating layer is formed on the one side of the rubber asphalt in place of the mineral powder particle adhesion layer, and the release paper is temporarily adhered to the rubber asphalt. Those to which the tackifying resin is added and those to which the tackifying resin is added to butyl rubber can be suitably used. Examples of the tackifying resin include rosin hydrogenated rosin, polyterpene resin, cyclopentadiene resin, aromatic petroleum resin, xylene resin and coumarone indene resin.

As the face material used in place of the mineral powder particles on the other side of the rubber asphalt coating layer, a non-woven fabric made of synthetic fiber or glass fiber, a woven fabric, or a non-woven fabric laminated Alternatively, it is also possible to use an asphalt felt obtained by impregnating a rug base paper usually used as a core material for asphalt roofing with asphalt, and a synthetic resin film.

The synthetic resin used to form the resin coating containing the hollow microspheres in the present invention includes acrylic ester emulsions such as homopolymer emulsions and copolymer emulsions of acrylic acid ester and methacrylic acid ester, and vinyl acetate. , Styrene, acrylonitrile, acrylamide, copolymer emulsion with acrylic acid, and the like. From the viewpoint of flexibility of the resin coating, those having a glass transition point of 0 ° C. or lower are preferable. These dried resin coatings are flexible, rich in rubber-like elasticity, and excellent in weather resistance and water resistance. In this,
A vinyl acetate / acrylic acid ester copolymer resin emulsion and a vinyl acetate / methacrylic acid ester copolymer resin emulsion are particularly preferable because they have good adhesiveness.

The heat-expandable microspheres mixed in the resin mixture used to form the resin coating containing the micro hollow spheres have vinylidene chloride-acrylonitrile copolymer as the outer shell and isobutane as the foaming material. There is an encapsulating / encapsulating compound with an average particle size of about 10 μm. When heated, the polymer in the outer shell softens, the encapsulated isobutane gasifies and expands, and it is a true sphere with a particle size of about 40 μm and has no internal pressure. A hollow sphere is created. This hollow sphere is
It has a bulk specific gravity of 0.02 or less, has a density of about 1/10 of that of ordinary lightweight aggregates such as perlite and vermiculite, and has elasticity in itself. That is, it deforms when static pressure is applied, but returns to its original shape when the pressure is removed. The amount of the heat-expandable microspheres used is
Usually, the solid content of acrylic ester emulsion is 100
5 to 60 parts by weight with respect to parts by weight, preferably 20 to
40 parts by weight. If the amount used is less than 5 parts by weight, the friction resistance of the resin coating is low, and it is difficult to obtain satisfactory anti-slip properties. Even if the amount used exceeds 60 parts by weight, the anti-slip properties do not change, and It is not preferable because the adhesiveness to the lower layer is lowered and the resin film is likely to peel off at the interface.

The water repellent used in the resin mixture of the present invention may be a fluorine-based or silicone-based resin emulsion, and the amount thereof is usually 100 parts by weight of the solid content of the acrylic ester emulsion. On the other hand, the solid content of the water repellent is 2 to 20 parts by weight. The preferred amount used is 6 to 14 parts by weight. If the amount used is less than 2 parts by weight, it is difficult to obtain a sufficient water repellency effect, while if the amount used exceeds 20 parts by weight, the effect remains the same.

Further, examples of the antiblocking agent include silica gel, activated alumina, acid clay and the like.
Among these, μm size silica gel can be effectively used. The amount used is usually 10 to 40 parts by weight with respect to 100 parts by weight of the solid content of the acrylic ester emulsion,
It is preferably 15 to 30 parts by weight. If the amount used is less than 10 parts by weight, it is difficult to obtain the antiblocking effect, and even if it is used in excess of 40 parts by weight, the effect remains the same and the dispersibility at the time of production is deteriorated, which is not preferable.

If necessary, an inorganic filler, a dispersant, a defoaming agent, etc. are mixed with the resin mixture. Examples of the inorganic filler include calcium carbonate, kaolin clay, dolomite, talc, etc., which are used as fillers,
Any of these can be suitably used, and the amount used is usually
It is 20 to 100 parts by weight based on 100 parts by weight of the solid content of the acrylic ester emulsion. If the amount used is less than 20 parts by weight, the effect as an extender is small, and if it exceeds 100 parts by weight, the dispersibility during the production of the resin mixed liquid is lowered and it becomes difficult to obtain a uniform mixed liquid.

The dispersant is used for the purpose of completely dispersing the agglomerates of solid particles in water, and includes alkyl sulfate, alkyl allyl sulfonate, dialkyl succinate, alkyl naphthalene sulfonate,
Examples thereof include alkylamide sulfonate, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether and the like. The amount of dispersant used is usually
It is preferable to add 2 to 10 parts by weight to 100 parts by weight of the solid content of the acrylic ester emulsion. If the amount used is less than 2 parts by weight, it is difficult to obtain the dispersing effect, and even if it is used in excess of 10 parts by weight, the dispersing effect is the same and does not further improve.

The antifoaming agent preferably has a foam suppressing action,
Examples thereof include silicones such as dimethyl silicone and polyether modified silicone, and polyoxyalkylene glycol. The amount of defoaming agent used is usually 2 to 100 parts by weight of the solid content of the acrylic ester emulsion.
6 parts by weight. If the amount used is less than 2 parts by weight, the defoaming effect is not sufficient, and if it exceeds 6 parts by weight, the defoaming effect remains the same. Further, if necessary, water may be added for the purpose of adjusting the viscosity of the color pigment and the resin mixed solution. The color pigment is preferably a paste in consideration of dispersibility. In addition, by coloring the resin coating in white or bright color,
The temperature rise of the rubber asphalt layer can be prevented to some extent.

In the present invention, the above resin mixture is
It is applied in the manufacturing process on the other surface side of the base material coated with rubber asphalt through the mineral powder adhering layer or face material, and it is not possible to directly apply the resin mixture on the rubber asphalt layer. It is impossible due to manufacturing technology. The coating amount of the resin mixed liquid is usually 15 to 100 g / m ² . Application amount is 15
If it is less than g / m ^2, it is difficult to prevent slipperiness, stickiness to the sole and the accompanying deviation of the asphalt layer.
Even if the coating amount exceeds 00 g / m ² , the effect is the same and it is not economical. After coating the rubber asphalt on both sides of the base material in the manufacturing process, spray the mineral powder particles on the other side surface or attach the face material, and then apply a predetermined amount of resin mixture with a roll coater. The heating device. The heating temperature is usually 90 to 120 ° C and the required time is 5 to 2
It takes about 0 minutes. If the heating temperature is high, the required time may be short, but if it exceeds 120 ° C., the softening point of the rubber asphalt becomes higher than the melting point of the rubber asphalt, or the rubber asphalt layer is softened and deformed, which is not preferable. On the other hand, if the temperature is lower than 90 ° C., the expansion of the heat-expandable microsphere is insufficient, or even if expanded, it takes a long time and is not practical.

[0016]

[Function] When the acrylic ester emulsion is heated after applying a resin mixture containing heat-expandable microspheres, the water of the resin mixture evaporates and the polymer forming the outer shell of the microsphere softens, The enclosed isobutane is gasified and expanded, and the particle size is about 4
A fine hollow sphere with no internal pressure can be produced with a true sphere of 0 μm.
When the water evaporates, a film having the flexibility and high elasticity of the acrylic ester-based resin, which covers the hollow microspheres, and which has an antiblocking effect is formed. That is, in the present invention, since a resin coating containing fine hollow spheres is formed on the surface of the roof underlaying material and is flexible and has an antiblocking effect, it is excellent in friction resistance, stickiness is also prevented, and is included in the resin coating. Due to the influence of the minute hollow spheres, the temperature rise of the rubber asphalt layer can be prevented to some extent. Further, since the rubber asphalt layer is provided on both sides of the base material, the nail hole sealing property is excellent, and when the adhesive layer is provided on the back surface, the nail hole sealing property is further improved.

[0017]

EXAMPLES Next, examples of the present invention will be described. [Example 1] With an asphalt roofing manufacturing machine, both sides of a base material in which a polyester synthetic fiber nonwoven fabric is impregnated with asphalt are coated with rubber asphalt in which 12% by weight of styrene / butadiene / styrene rubber is mixed with asphalt to coat one side. It is made by spraying silica sand (No. 7) on the surface and adding styrene / butadiene / styrene rubber, process oil, petrozine (aromatic petroleum resin), etc. to the asphalt on the rubber asphalt coating layer on the other side. The pressure-sensitive adhesive was applied and laminated, and release paper was temporarily adhered onto the pressure-sensitive adhesive to prepare an asphalt roofing having a thickness of 1.5 mm. Next, vinyl acetate / acrylic acid ester copolymer resin emulsion (solid content 50%, glass transition point 0 ° C.,
Hoechst Gosei Co., Ltd .: Product name Movinyl 662) 200 g
That is, resin solid content 100 g, heat-expandable microspheres (product name: Expancel WU manufactured by Nippon Philite Co., Ltd.)
642) 5 g, a water repellent (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd .: trade name Eras Guard 180) 20 g, an antiblocking agent (Fuji Devison Chemical Co., Ltd .: trade name Syloid 620) 10
g, 100 g of heavy calcium carbonate as an inorganic filler, a dispersant (manufactured by Lion Corporation: trade name Liponox NC-12)
0) 8 g, antifoaming agent (Lion Co .: Leocon 1020
B) 4 g and 220 g of water were put in a container having a capacity of 1 liter, and a stirring device (Shinto Kagaku Co., Ltd. three one motor TYPE
(600 GS) with stirring for 20 minutes to obtain a uniform resin mixture. Prepare a number of pieces of the asphalt roofing made earlier and cut into a size of about 30 cm square,
A resin coating containing fine hollow sphere powder by applying 15 g / m ² of the above resin mixture with a rubber brush on the surface to which silica sand has been sprinkled and adhered, and treating it in a heating constant temperature layer for 20 minutes at 90 ° C. Was formed. Various tests were performed on a plurality of samples to evaluate the performance.
In addition, the performance evaluation method and the determination criteria were performed by the methods described below. [Examples 2 to 6] Using different resin mixture liquids having different blending ratios, surface undertreatment roof underlayment materials were obtained by the same method as in Example 1, tested, and evaluated.

Comparative Examples 1 and 2 By the same method as in Example 1 except that a resin coating film (that is, a resin coating film having no minute hollow spheres) was formed with a resin mixture solution that did not use heat-expandable microspheres. A under-roof material subjected to surface treatment was obtained, tested, and evaluated (Comparative Example 1). In addition, a roof underlaying material obtained by the same method as in Example 1 was tested and evaluated (Comparative Example 2) except that no coating film of the resin mixture was formed on the surface to which the silica sand was sprayed and adhered. The above results are shown in Table 1.

[0019]

[Table 1]

[Performance Evaluation Method and Judgment Criteria] (1) Friction Resistance In a test conducted to show the resistance to slip, a steel sample was attached to a slope of 5 inch slope, and a rubber shoe sole was attached onto it. Place a weight made of steel so that the bottom surface of the shoe is in contact with the surface of the sample, and use a tensile tester to put the weight on the slope with a tensile strength of 500 mm / min.
Move by 00 mm, read the maximum load and the minimum load from the chart, and measure the average tensile load. The friction coefficient μ is calculated by the following formula μ = T / (W · cosα) + tanα where T: average tensile load (kgf) W: mass of weight (kgf) where the weight is steel 5 kg (width 10 cm, 20 cm long,
Height about 3 cm) and rubber sole 0.1 kg total 5.1 k
g, and since it is a 5 inch gradient, α = 26.34 °, and cos α = 0.894 and tan α = 0.500, so μ = T / (5.1 × 0.894) +0.500 expressed. The difficulty of slipping is judged by the magnitude of the numerical value of the friction coefficient. The criteria for judgment are as follows. μ = 1.2 or more ◎: Difficult to slip μ = 0.9 to 1.2 ○: Slightly hard to slip μ = 0.6 to 0.9 Δ: Normal μ = 0.6 or less ×: Easy to slip The above frictional resistance In the test, the coefficient of friction was determined for two types, one in which the surface of the test body was in an air-dried state and the other in which the surface was sprinkled to make it wet.

(2) Adhesion resistance 5 cm in a test conducted to check the stickiness of the shoe sole.
A sample cut into the same size is placed on a plywood of × 5 cm, a rubber plate is attached on it, and a weight (steel 3 kg, 5 cm × 5
cm × about 15 cm) was placed so that the surface of the rubber plate was in contact with the surface of the sample, and the sample was allowed to stand horizontally in a constant temperature layer heated at 70 ° C. for 2 hours to observe the presence or absence of adhesion. The criteria for judgment are as follows. ◎: No adhesion ○: Almost no adhesion △: Some adhesion ×: Adhesion

(3) Deviation resistance In this test, when the underlaying material is heated by direct sunlight during construction and the asphalt coating layer is softened, the coating layer may be displaced by the load due to walking. This is done to check the degree, and the method is to fix the four corners of the sample to the 6-inclined slope with staples, and attach a rubber plate attached weight (steel 1 kg, 5 cm × 5 cm × about 5 cm) to the rubber. The plate was placed so that the surface of the plate was in contact with the surface of the sample, and the plate was allowed to stand in a constant temperature heating layer at 70 ° C. for 1 hour, and then the deviation length was measured. The criteria for judgment are as follows. Displacement length 0 mm ・ ・ ・ ・ ◎ ◎ Less than 1 mm ・ ・ ・ ・ ○ 1 mm or more and less than 5 mm ・ ・ ・ △ 5 mm or more ・ ・ ・ ・ ・ ・ ・ ・ ×

(4) Water repellency This test was carried out because it is preferable that the surface of the underlaying material having good water repellency is hard to slip. The test method is JIS P 8
The water repellency test method for 137 paper and paperboard was applied mutatis mutandis. The criteria for judgment are as follows. Water repellency R ₉ , R ₁₀・ ・ ・ ◎ R ₇ , R ₈・ ・ ・ ○ R ₄ , R ₆・ ・ ・ △ R ₀ , R ₂・ ・ ・ ×

(5) Adhesiveness of Resin Coating In order to investigate the adhesiveness to the layer below the resin coating formed by heating, the adhesive strength (kgf / cm ² ) was measured by the adhesiveness test specified in JIS A 6910. did. The criteria for judgment are as follows. Adhesive strength 4kgf / cm ² or more ^{······· ◎ 2.0~4.0kgf / cm 2 ··· ○} 0.5~2.0kgf / cm 2 ··· △ 0.5kgf / cm 2 or less・ ・ ・ ・ ・ ×

[0025]

INDUSTRIAL APPLICABILITY The under roofing material of the present invention has a resin coating containing fine hollow sphere powder on its surface, which is flexible and has an antiblocking effect.
When it is used on a roof with a steep slope of more than 3 inches, it is highly safe for the worker to be slippery regardless of whether the surface of the roof underlayment is dry or wet. Further, even if the temperature of the underlaying material rises due to the influence of direct sunlight, since the above resin coating is present,
It is possible to prevent stickiness of the operator's sole. Further, since the hollow microspheres contained in the resin coating can prevent the temperature rise of the rubber asphalt layer as the lower layer to some extent, the shape of the rubber asphalt does not change due to walking. Further, since the rubber asphalt layer is provided on both surfaces of the base material, the nail hole sealing property is excellent even if a pier or a roofing material is nailed, and water leakage around the nail shaft can be prevented. By providing an adhesive layer such as rubber asphalt on the back surface, the nail hole sealability can be further improved.

Claims (4)

[Claims] 1. A core material impregnated with asphalt is used as a base material, and a rubber asphalt coating layer is formed on both surfaces of the base material,
And, on the one surface side of the rubber asphalt coating layer, a mineral powder particle adhesion layer or a temporarily adhered adhesive layer of release paper is formed, and on the other surface side, the mineral powder particle adhesion layer or surface. An under-roofing material, which is formed by forming a flexible resin coating containing fine hollow spheres through the material and having an antiblocking effect. 2. The resin coating is formed by applying a resin mixture containing an acrylic ester emulsion, heat-expandable microspheres, a water repellent and a blocking inhibitor, and then heating. The under-roof material according to claim 1, characterized in that. 3. The resin coating comprises 5 to 60 parts by weight of heat-expandable microspheres and 2 to 2 parts of a water repellent solid based on 100 parts by weight of the solid content of the acrylic ester emulsion.
The resin mixture solution containing 0 parts by weight and 10 to 40 parts by weight of an anti-blocking agent is applied, and then heated at 90 to 120 ° C. for 5 to 20 minutes, and formed. Under the roof of the roof. 4. The coating amount of the resin mixture liquid is 15 to 100.
The under-roofing material according to claim 2 or 3, which is g / m ² .