JP4615367B2 - Non-slip sheet and roofing material using the same - Google Patents

Description

  The present invention relates to an anti-slip sheet and a roofing material using the same, and more particularly, to a non-slip sheet and an anti-slip roofing material that can be used for a roof of a house and is excellent in anti-slip property, strength, and waterproof property.

Conventionally, tiles, slate, metal plates, and the like are used for roofs of buildings and the like, but waterproof asphalt roofing and the like are used as the underlaying material for the roofs. However, in recent years, there are many roofs with slopes, so it is slippery when working on the roof, and it is unavoidable to perform extremely dangerous work. There is a need for understory materials. In general, the performance required for the roofing material includes water resistance, slip resistance, strength, and asphalt exudation.
Patent Document 1 proposes an asphalt roofing felt in which a surface layer is formed of a non-slip synthetic resin layer containing fine particles, but the amount of fine particles is small, anti-slip properties are reduced, and the fine particle size is increased. Then, the coating processability of the substrate is inferior, and furthermore, since the coating process is performed on the entire surface, if the coating amount is small, the slip resistance is extremely lowered, and conversely if it is increased, the slip resistance is improved, but the price is increased. There is.
Patent Document 2 proposes a roofing material in which a resin containing inorganic particles is partially formed in a dot shape to impart antislip properties, but if the amount of resin applied is small, the antislip property is extremely reduced. On the contrary, when the application amount is increased, the slip resistance is improved, but the dot interval of the application part is widened, and in the non-application part, since the resin containing inorganic particles is not applied, it becomes easy to slip, There is a problem that the resin of the waterproof layer is likely to ooze out.
Patent Document 3 proposes a non-slip roofing material in which the resin foam layer has a non-slip property, but there is a problem that it is easy to slip in the workability under rainy weather.

Japanese Patent No. 3225167 JP 2000-31015 A JP 2002-227352 A

  An object of the present invention is to solve the above-described problems and provide an anti-slip sheet and an anti-skid roofing material excellent in anti-slip property, productivity, strength, and seepage.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that a resin containing an anti-slip agent is disposed on the surface of the sheet base material in a low density region and a high concentration region alternately in a stripe shape. It was found that the use of the anti-slip agent improves the anti-slip property, and the present invention has been achieved. That is, the invention claimed in the present application is as follows.

(1) An anti-slip sheet in which a resin containing inorganic particles is applied on at least one side of a sheet base material, wherein the slip start angle of the sheet surface is 20 degrees or more and the burst strength is 10 kPa or more. An anti-slip sheet characterized in that low concentration regions and high concentration regions of inorganic particles in a resin are alternately arranged in a stripe shape.
(2) The application amount (A) in the low concentration region of the inorganic particles of the resin is 10 to 60 g / m ² in a width of 10 to 100 mm, and the application amount (B) in the high concentration region is 3 to 30 mm. of a 70~150g / m ² in width, and slip resistant sheet according to the coating amount difference between a and B is characterized in that it is a 20~100g / m ² (1).
(3) The average particle size of the inorganic particles is 50 to 250 μm, and the mixing ratio of the inorganic particles and the resin is 0.5: 1 to 3: 1 by weight (1) or The anti-slip sheet according to (2).
(4) The slip-proof sheet according to any one of (1) to (3), wherein the sheet base material is composed of a structure selected from at least one of nonwoven fabric, paper, and film.
(5) The non-slip sheet according to (4), wherein the non-woven fabric is a polyester-based long-fiber non-woven fabric having an average fiber diameter of 7 to 40 μm and a basis weight of 30 to 150 g / m ² .
(6) The non-slip sheet according to (4) or (5), wherein the nonwoven fabric is obtained by laminating ultrafine fibers having an average fiber diameter of 1 to 7 μm in at least one layer thereof.
(7) The slip-proof sheet according to any one of (1) to (6), wherein the sheet base material is obtained by laminating and adhering a synthetic resin film to at least one layer thereof.
(8) An anti-slip property characterized in that a waterproof layer is formed by impregnation or coating of the resin containing asphalt on the surface opposite to the resin-coated surface of the anti-slip sheet according to (1) to (7). Roofing material.

  In the present invention, a resin containing inorganic particles is present over the entire surface, and the coating amount is changed in a stripe shape between a low concentration region and a high concentration region to provide a difference in anti-slip properties on the resin-coated surface. With a relatively small coating amount, more effective anti-slip properties can be imparted, and further, the exuding property of waterproofing resins such as asphalt can be prevented. An excellent anti-slip sheet and an anti-slip roofing material can be provided.

The sheet substrate used in the present invention is not particularly limited as long as it is a sheet-like material such as a nonwoven fabric, paper, or film, but a nonwoven fabric is particularly preferably used in terms of strength, workability, economy, and the like. Moreover, the laminated structure of these sheet-like materials may be sufficient.
Basis weight of the sheet substrate is not particularly limited, in the case of using the nonwoven fabric, 30 to 150 g / m ^2, preferably from 40 to 120 g / m ^2. If the basis weight is less than 30 g / m ² , the strength may be insufficient.On the other hand, if it exceeds 150 g / m ² , the strength is sufficient, but the rigidity is increased, workability is reduced, and the cost is disadvantageous. Become.

  The fiber constituting the nonwoven fabric of the present invention is not particularly limited as long as it has heat resistance and strength during processing such as resin coating or impregnation. Examples of fibers include polyolefin fibers such as polyethylene, polypropylene, and copolymerized polypropylene, polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, and copolymerized polyester, and polyamides such as nylon-6, nylon-66, and copolymerized nylon. Fiber, sheath is polyethylene, polypropylene, copolymer polyester, core is a composite sheath such as a core-sheath structure composed of a combination of polypropylene, polyester, etc., and fibers such as biodegradable fibers such as polylactic acid, polybutylene succinate, polyethylene succinate And rayon fiber, cellulose fiber, acrylic fiber, vinylon fiber, natural fiber, regenerated fiber and the like are used.

These constituent fibers may be short fibers or long fibers alone, or two or more kinds of fibers may be laminated or mixed. For example, a multi-layer nonwoven fabric made of a spunbond fiber of relatively thick fibers such as SS, SMS, SMMS, and SMSMS and a melt blown ultrafine fiber can be used (where S is a spunbond fiber, M Indicates melt blown ultrafine fibers). The nonwoven fabric can be obtained by treating the constituent fibers by a known spunbond method, thermal bond method, airlay method, card method, melt blow method, columnar flow entanglement, mechanical entanglement, or the like.
In particular, a polyester-based long-fiber nonwoven fabric having an average fiber diameter of 7 to 30 μm and a basis weight of 30 to 150 g / m ² obtained by a spunbond method is preferably used because of heat resistance, strength, hydrophobicity, and the like. Further, a multilayer nonwoven fabric obtained by laminating a long fiber layer of a spunbond method and an ultrafine fiber layer having an average fiber diameter of 1 to 7 μm and a basis weight of ² to 10 g / m ² by a melt blow method is preferably used.

    As the paper, natural fibers such as cellulose, inorganic fibers such as glass fibers, mixed paper made of mixed fibers of synthetic fibers and cellulose, waterproof paper impregnated with asphalt, and the like are preferably used.

  A film having a softening temperature or a melting point in the range of 80 to 200 ° C. is preferable from the viewpoints of heat resistance and workability. Examples of these films include polyester resins such as polyolefin resins such as low density polyethylene, high density polyethylene, polypropylene, copolymer polyethylene, and copolymer polypropylene, aliphatic polyesters, aromatic polyesters, polylactic acid, and copolymer polyesters. Polyamide resins such as nylon 6, nylon 66, copolymer nylon, ethylene-vinyl acetate resin, etc., produced by a known T-die method, may be used alone or in a laminate film of two or more layers. The thickness of the film is preferably 20 to 100 μm, more preferably 30 to 70 μm.

  As the inorganic particles of the present invention, grindstone particles, silica sand and the like are used. If the particle size is fine, the workability is improved, but the anti-slip property is lowered.On the other hand, if the particle size is large, the anti-slip property is improved, but the wear of the coating blade becomes severe, and the workability deteriorates. An average particle size of 50 to 250 μm, particularly an average particle size of 60 to 200 μm is preferable.

  The resin for fixing the inorganic particles of the present invention includes water-soluble resins such as acrylic ester emulsion, synthetic rubber latex, vinyl acetate resin, urethane resin, acrylic resin, urethane resin, epoxy resin, etc. Solvent-based resin or the like can be used. Depending on the purpose of use, the resin may be colored by adding a pigment, or by adding a durability improver such as an ultraviolet absorber, a resin stabilizer, a water repellent or the like.

  The inorganic particles of the present invention are used by mixing with a resin to be fixed. When the ratio of the resin is large, inorganic particles are included in the resin, and the desired anti-slip property cannot be obtained. On the contrary, when the ratio of the resin is small, the inorganic particles are not sufficiently fixed and easily fall off. Therefore, the ratio (weight ratio) between the inorganic particles and the resin is preferably 0.5: 1 to 3: 1, and more preferably 0.7: 1 to 2.5: 1.

  The anti-slip sheet of the present invention has a low concentration region (A) in which a relatively small amount of resin containing inorganic particles is applied in a range where the slip start angle of the sheet surface is 20 degrees or more and the burst strength is 10 kPa or more. The high-concentration region (B) is formed in a stripe shape, and an excellent anti-slipping effect can be obtained with a relatively small coating amount by adopting an arrangement having a difference in the resin coating amount.

The anti-slip sheet of the present invention is more effective when used in an oblique direction or at a right angle to the slip direction because the anti-slip agent has a stripe shape and has a relatively large amount of stripe. Anti-slip properties can be obtained. In addition, in the work on the roof, it is particularly effective to construct 3-5 places in the form of a stripe near the operator's feet. Accordingly, the slip start angle in the present invention is measured when the sheet is disposed so that the stripe shape is perpendicular to the slip direction, as described in the examples, and when the sheet is dried and wet. The sliding start angle at the time of drying is 20 degrees or more, preferably 25 degrees or more, and the upper limit is set from the sloped shape of the roof and the like.
The assumed slip start angle when wet, such as rainy weather, is 20 degrees or more, preferably 24 degrees or more. From the description in Table 1 of the Examples, the anti-slip sheet of the present invention has the characteristics that it shows almost the same anti-slip property both when dry and when wet compared to the comparative example, and is hardly affected by wet weather such as rain. Have.

The width and coating amount (A) of the portion with a small coating amount are 10 to 100 g / m ² with a width of 10 to 100 mm, and the width and coating amount (B) of the portion with a large coating amount are 3 to 30 mm in width. in a 70~150g / m ^2, and the coating amount difference of (a) and (B) is 20 to 100 g / m ^2, more preferably 25~80g / m ^2, more preferably, both The thickness difference between the portions is 0.05 to 0.35 mm, more preferably 0.08 to 0.30 mm. Further, it is necessary to arrange (A) and (B) alternately in a stripe shape.
In this way, when areas with high anti-slip properties and areas with low slip are alternately arranged in a stripe pattern and used almost at right angles to the sliding direction, the stripe width, spacing and thickness steps (concave / convex shape), etc. From the synergistic effect of the above, the frictional force is intermittently generated, and the driving force for sliding can be suppressed in a stepwise manner, and as a result, excellent slip resistance can be obtained. In particular, superior slip resistance can be obtained in an oblique direction or a perpendicular direction. When there is no stripe shape, the frictional force is constant, and once it starts to slide, it cannot be suppressed, resulting in low slip resistance.

  The method of applying the resin to the sheet base is, for example, using a knife blade provided with a recess of depth 0.01 to 1.0 mm, preferably 0.03 to 0.8 mm, a width of 3 to 30 mm, and a distance of 10 to 100 mm. It is applied by a known knife coating method or floating method, dried, and heat set. Depending on the purpose, finishing such as printing and water repellent is also performed.

  The anti-slip property of the anti-slip sheet of the present invention is a sliding start angle of 20 degrees or more, preferably 25 degrees or more. The greater the sliding start angle, the better the slip resistance.

  The rupture strength of the anti-slip sheet of the present invention is required to be 10 kPa or more, preferably 20 kPa to 500 kPa, so that it is difficult to break during the installation work of the roofing material.

The anti-slip roofing material of the present invention is a known process using a waterproofing agent composed of straight asphalt, blown asphalt, modified asphalt containing rubber resin in asphalt, etc. It is obtained by forming a waterproof layer by impregnation or coating using a machine. The application amount of the waterproofing agent is usually 50 to 1000 g / m ² , preferably 100 to 700 g / m ² .

EXAMPLES Hereinafter, although this invention is demonstrated further more concretely using an Example, this invention is not limited at all by these Examples. The characteristic values used in the present invention were measured by the following methods.
(1) Weight per unit area (g / m ² ): Conforms to JIS-L-1906.
(2) Average fiber diameter (μm): Take an enlarged photograph 500 times with an electron microscope,
Ask.
(3) Burst strength (kPa): Measured at three locations using a JIS-L-1096 Murren type testing machine,
Obtained by average value.
(4) Sliding start angle: A sample with a width of 5cm x length of 30cm is attached to the measurement part, and the load is 250g
Start sliding by applying cm ² (5 kg load with a contact surface width of 4 cm and a length of 5 cm)
Measure the angle to perform. However, the specimen must be attached when the load is slipped.
The direction should be 90 degrees to the stripe shape (when wet)
: State measured after wetting the sample in water).
(5) Tensile strength (N / 5cm): according to JIS-L-1906, with a tensile tester, 5cm wide and 30cm long
The material is cut and gripped at a distance of 10 cm and a tensile speed of 10 cm / min.
Measure 3 points each and find the average of 3 points.

[Examples 1-4, Comparative Examples 1-2]
Using polyethylene terephthalate (intrinsic viscosity 0.78) by a known spunbond method, melt spinning, drawing, opening, collecting, and obtaining a fiber web through an extruder, gear pump, and spinneret, and then between an embossing roll and a smooth roll, A polyester continuous fiber non-woven fabric was thermocompression-bonded by heating and pressurization to obtain a partially heat-bonded polyester non-woven fabric (average fiber diameter 13 μm, basis weight 70 g / m ² , partial thermocompression rate 15%).
Next, in order to form a stripe-like coating portion on the nonwoven fabric, using a knife blade with the depth, width, and interval of the recesses changed, an acrylic resin fixing agent (Dainippon Ink Industries, product) Name: Chris Coat P1330) was mixed with abrasive particles and resin containing inorganic particles was applied with a coating processing machine and dried at a temperature of 130 ° C. to obtain an anti-slip sheet of the present invention. The results are shown in Table 1.
From Table 1, in Examples 1 to 4, the processability of the resin containing inorganic particles was able to be continuously produced without any problem in durability, such as the amount of coating being changed due to wear of the knife blade. The obtained anti-slip sheet was excellent in anti-slip property and strength by providing a stripe-like difference in the coating amount.
On the other hand, Comparative Example 1 is a sheet having a small particle diameter of 10 μm and a small effect of the particle diameter, so that it has a low anti-slip effect. Comparative Example 2 is a small particle diameter of 10 μm and partially coated. However, since the thing with a small inorganic type particle diameter was used, it was a thing with a low anti-slip effect.
The sliding start angles when wet in Examples 1 to 4 were almost the same as those during drying, and the slipperiness was less affected by wetness than Comparative Examples 1 and 2.

[Example 5]
The modified asphalt was applied at a coating amount of 350 g / m ² with a coating machine on the opposite side of the non-slip sheet of the anti-slip sheet of Example 2 to form a waterproof layer. The obtained roofing material was excellent in waterproofness and slip resistance.

Claims (8)

A slip-proof sheet in which a resin containing inorganic particles is applied to at least one surface of a sheet base material, and the slip start angle of the sheet surface is 20 degrees or more, and the burst strength satisfies 10 kPa or more. An anti-slip sheet characterized in that the low concentration region and high concentration region of inorganic particles are alternately arranged in a stripe shape. The application amount (A) in the low concentration region of the inorganic particles of the resin is 10 to 60 g / m ² in a width of 10 to 100 mm, and the application amount (B) in the high concentration region is in a width of 3 to 30 mm. a 70~150g / m ^2, and slip resistant sheet according to claim 1, the coating amount difference between a and B is characterized in that it is a 20 to 100 g / m ^2. The average particle size of the inorganic particles is 50 to 250 µm, and the mixing ratio of the inorganic particles and the resin is 0.5: 1 to 3: 1 by weight. Anti-slip sheet. The anti-slip sheet according to any one of claims 1 to 3, wherein the sheet base material is composed of a structure selected from at least one of nonwoven fabric, paper, and film. The slip-proof sheet according to claim 4, wherein the nonwoven fabric is a polyester-based long-fiber nonwoven fabric having an average fiber diameter of 7 to 40 µm and a basis weight of 30 to 150 g / m ² . The anti-slip sheet according to claim 4 or 5, wherein the nonwoven fabric is obtained by laminating ultrafine fibers having an average fiber diameter of 1 to 7 µm in at least one layer thereof. The slip-proof sheet according to any one of claims 1 to 6, wherein the sheet base material is obtained by laminating and adhering a synthetic resin film to at least one layer thereof. An anti-slip roofing material, wherein a waterproof layer is formed on the surface opposite to the resin-coated surface of the anti-slip sheet according to claim 1 by impregnation of the resin containing asphalt or coating.