JP2019025711A - Nonflammable sheet, smokeproof vertical wall and smokeproof screen/curtain using nonflammable sheet, and method for producing nonflammable sheet - Google Patents

Abstract

To provide a nonflammable sheet which can be easily produced, prevents generation of a waste generated in a conventional production process, and is excellent in flexibility and cutting properties.SOLUTION: A nonflammable sheet 1 that is formed by laminating a thermoplastic resin layer 4 on both surfaces of a glass cloth 2 through an adhesive layer 3, where a yarn count of a glass fiber in the glass cloth 2 is 3-20 tex, a density total of warp and weft is 80-190/25 mm, the adhesive layer 3 is formed of a resin composition containing a polyvinyl chloride (PVC) paste resin and at least one plasticizer having a molecular weight of 380 or less, a percentage content of the plasticizer to the total amount of the resin composition constituting the adhesive layer 3 is 30-80 mass%, and total light transmittance thereof is 75% or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a non-combustible sheet in which a thermoplastic resin layer is laminated on both surfaces of a glass cloth via an adhesive layer, a manufacturing method thereof, a smoke-proof hanging wall and a smoke-proof screen curtain using the non-combustible sheet.

  Buildings such as office buildings and commercial facilities are provided with smoke barriers and smoke screens as part of smoke exhausting and smoke shielding facilities. Since the smoke proof wall is attached to a ceiling free of visual obstacles, it is generally composed of a member having transparency (for example, a transparent plate glass) so as not to obstruct the visual field. In addition, curtains and partitions are widely used at factories and warehouse entrances, clean booths, etc., but this type of curtains and partitions can be used even when closed, and the other side can be seen through the curtain. Many are known which are composed of a transparent sheet made of a flexible transparent member (for example, vinyl chloride resin) and a central bone attached to the transparent sheet at equal intervals.

  In recent years, non-combustible sheets have been widely used in the smoke barriers and smoke screens. For example, a transparent noncombustible sheet having a structure in which a glass fiber fabric is impregnated with a curable resin composition and sandwiched between a pair of curable resin sheets is known (for example, see Patent Documents 1 and 2).

JP 2011-84070 A JP 2015-42794 A

  The transparent noncombustible sheet in which the glass fiber fabric described in Patent Documents 1 and 2 is disposed inside the curable resin plate is manufactured through a step of impregnating the glass fiber fabric with a curable resin in the glass fiber fabric. Since the conventional transparent incombustible sheet thus obtained requires the above-described process in the manufacturing process, there is a problem that the process is complicated and the manufacturing cost is high.

  Moreover, although the transparent nonflammable sheet as disclosed in Patent Documents 1 and 2 has the advantages of being transparent and nonflammable and having high mechanical strength, it has poor flexibility and the sheet is rolled. It is difficult to wind it up and the form of supply is limited. Furthermore, since the sheet is hard, it is necessary to cut many times when cutting during processing, and there is a problem that workability is poor.

  This invention is made | formed in order to solve the subject of said prior art, and makes it a subject to provide the nonflammable sheet | seat which can be manufactured easily and was excellent in the softness | flexibility and cutting property.

As a result of intensive studies to solve the above-mentioned problems, the present inventors formed a predetermined adhesive layer on a predetermined thermoplastic resin film, and laminated it with a predetermined glass cloth, which is equivalent to a conventional product. The present inventors have found that a non-combustible sheet can be produced and have completed the present invention.
That is, the present invention is a non-combustible sheet in which a thermoplastic resin layer is laminated on both surfaces of a glass cloth through an adhesive layer, the glass fiber count in the glass cloth is 3 to 20 tex, warp and weft yarns The total density is 80/25 mm to 190/25 mm, and the adhesive layer includes a polyvinyl chloride (PVC) paste resin and at least one plasticizer having a molecular weight of 380 or less. The content of the plasticizer with respect to the mass is 30 to 80% by mass, and the total light transmittance is 75% or more.

  In the incombustible sheet of the present invention, the difference in refractive index between the plasticizer and the resin composition constituting the glass cloth and the thermoplastic resin layer is preferably 0.06 or less.

  In the incombustible sheet of the present invention, the plasticizer preferably contains a phthalate ester plasticizer as a main component.

  In the non-combustible sheet of the present invention, the thermoplastic resin layer is composed of a resin composition containing a vinyl chloride resin and a plasticizer, and the plasticizer content is 50% by mass with respect to the total mass of the thermoplastic resin layer. The following is preferable.

  Moreover, the nonflammable sheet of the present invention preferably has a surface roughness Ra on the adhesive layer side of the thermoplastic resin layer of 0.5 to 15.0 μm.

  Moreover, it is preferable that the thickness of the said thermoplastic resin layer is 0.05-0.20 mm in the nonflammable sheet | seat of this invention.

In the incombustible sheet of the present invention, the coating amount of the adhesive layer is preferably 10.0 to 60.0 g / m ² .

  Moreover, it is preferable that the thickness of the whole nonflammable sheet | seat of this invention is 0.45 mm or less.

  Moreover, it is preferable that the nonflammable sheet | seat of this invention is used for any of a smoke-proof hanging wall, a smoke-shielding screen, a smoke-proof partition wall, and a smoke-proof curtain.

  Moreover, it is preferable that the nonflammable sheet | seat of this invention is used for a smoke-proof hanging wall, a smoke-proof screen, or a smoke-proof curtain.

  Further, the non-combustible sheet of the present invention comprises a step 1 of forming an adhesive layer on one surface of a thermoplastic resin layer, and a glass cloth on the adhesive layer of the thermoplastic resin layer formed with the adhesive layer obtained in the step 1. And a step 2 of laminating and laminating the glass cloth and the thermoplastic resin layer through an adhesive layer.

  According to the non-combustible sheet of the present invention, it is possible to provide a transparent non-combustible sheet that is easy to manufacture and low in cost and excellent in transparency, non-combustibility, flexibility, and cutting properties.

FIG. 1 is a view showing a nonflammable sheet 1 of the present invention.

The present invention is a non-combustible sheet in which a thermoplastic resin layer is laminated on both surfaces of a glass cloth via an adhesive layer, the glass fiber count in the glass cloth is 3 to 20 tex, and the total density of warps and wefts Is 80 pieces / 25 mm to 190 pieces / 25 mm, and the adhesive layer includes a polyvinyl chloride (PVC) paste resin and at least one plasticizer having a molecular weight of 380 or less, based on the total mass of the adhesive layer The plasticizer content is 30 to 80% by mass, and the total light transmittance is 75% or more.
Hereinafter, the present invention will be described in detail, but the present invention is not limited to the embodiments described below.

  For example, as shown in FIG. 1, the incombustible sheet 1 of the present invention has an adhesive layer 3 of a thermoplastic resin composition on both surfaces of a glass cloth 2 and a surface of the adhesive layer 3 opposite to the glass cloth 2. And a thermoplastic resin layer 4 provided on the surface.

(Glass cloth)
The glass cloth 2 used in the present invention is composed of a glass fiber fabric. Examples of the glass fiber fabric include one woven with warp and weft glass fibers, one in which a plurality of glass fibers in one direction are arranged in a direction in which the glass fibers intersect with each other, and a glass fiber orthogonal laminated net. Among these, those woven with glass fiber warp and weft are preferable. Examples of the woven structure by weaving include plain weave, satin weave, twill weave, oblique weave, and weave. The weaving structure by weaving is not particularly limited, but plain weaving is preferable in that uniform tensile strength can be obtained in any direction.

  Moreover, as glass fiber in a glass fiber fabric, general-purpose non-alkali glass fiber (E glass), acid-resistant alkali-containing glass fiber (C glass), high-strength and high-modulus glass fiber (S glass, T glass, etc.) ), Alkali-resistant glass fiber (AR glass) and the like. Among them, the use of alkali-free glass fibers having high versatility is preferable. The glass fibers constituting the glass cloth 2 may be made of one kind of glass material, or may be a combination of two or more kinds of glass fibers made of different glass materials.

  The glass fiber fabric may be woven with one type of glass fiber, or may be woven with two or more types of glass fibers. For example, the warp and the weft may be separate glass fibers. When woven with two or more types of glass fibers, the glass fiber counts may be the same or different. For example, the glass fiber composition may be the same, and the glass fiber diameter and count may be different.

  The glass cloth 2 of the present invention is subjected to fiber opening treatment, heat treatment, and silane coupling agent treatment for the purpose of ensuring adhesion performance and transparency. In the fiber opening treatment, it is possible to expect the effect of facilitating the impregnation of the resin by flattening the yarn and expanding the warp and weft stitches.

  As for the density of the glass fiber in the glass fiber fabric, the total warp and weft density is 80/25 mm or more, preferably 90/25 mm or more, and preferably 95/25 mm or more. The higher the density of the glass fiber, the higher the nonflammability, but the lower the transparency. Therefore, the upper limit of the density is preferably 190/25 mm or less, and more preferably 180/25 mm or less.

  The glass fiber thickness (tex count) is 3 tex or more, preferably 4 tex or more, more preferably 5 tex or more, and the upper limit is 20 tex or less, preferably 15 tex or less, more preferably 12 tex or less. One type of glass fiber count may be used alone, or two or more types may be combined. The tex count of the glass fiber corresponds to the number of grams per 1000 m.

  The gap between adjacent warp yarns in the glass fiber fabric is preferably 0.5 mm or less, and more preferably 0.3 mm or less. Moreover, it is preferable that the clearance gap between the adjacent wefts in a glass fiber fabric is 0.5 mm or less, and it is still more preferable that it is 0.3 mm or less. When the gap between the warp or weft of the glass fiber fabric is narrow, the flame may be difficult to pass through the glass fiber fabric. Therefore, the gap between the warp and the weft is preferably within the above range.

  The thickness of the glass cloth 2 is not particularly limited, but is usually preferably 0.3 mm or less. The thicker the glass cloth 2 is, the higher the mechanical strength such as the tear strength and rigidity of the non-combustible sheet 1 is, and the non-flammability can be enhanced. It becomes easy to impregnate a fiber fabric, it becomes easy to discharge | release the bubble contained between glass fibers outside, and the transparency of the nonflammable sheet | seat 1 can be improved more. From these viewpoints, the thickness of the glass cloth 2 in the incombustible sheet 1 is preferably 0.06 mm or less, more preferably 0.04 mm or less, and further preferably 0.03 mm or less. In particular, when the thickness of the glass cloth 2 is 0.03 mm or less, the flexibility of the non-combustible sheet 1 can be further increased. For example, when the non-combustible sheet 1 is used as a smoke shielding sheet or the like, the feeding portion Can be easily wound up and can be easily cut during processing. In addition, as a lower limit of the thickness of the glass fiber fabric 2, it can be about 0.01 mm, for example.

  The surface of the glass cloth 2 is preferably subjected to a silane coupling agent treatment. Examples of the silane coupling agent treatment include treatment using an aminosilane-based silane coupling agent. This treatment can improve the impregnation of the thermoplastic resin composition constituting the adhesive layer into the glass cloth. In addition, since a silane coupling agent adheres to the surface of each glass fiber, it does not affect the light transmission characteristic, air permeability, etc. of the glass cloth 2 substantially.

  Although it does not restrict | limit especially as a refractive index of the glass fiber which comprises the glass cloth 2, From a viewpoint of improving transparency, it is preferable to make it close with the refractive index of the thermoplastic resin composition which is an adhesive layer. Specifically, the refractive index of the glass fiber constituting the glass cloth 2 is about 1.40 to 1.70, more preferably about 1.50 to 1.60.

(Adhesive layer)
The adhesive layer 3 used in the incombustible sheet 1 of the present invention is composed of a thermoplastic resin composition containing polyvinyl chloride (PVC) paste resin and at least one plasticizer having a molecular weight of 380 or less. The material of the adhesive layer 3 is not particularly limited as long as it can adhere the thermoplastic resin 4 and the glass cloth 2, but polyvinyl chloride (PVC paste resin is dispersed in a plasticizer). Preferably, a PVC paste sol is used.
When the PVC paste sol is heated, absorption of the plasticizer into the PVC particles proceeds to change from a sol state to a gel state. If heating is further continued, melting proceeds and a good adhesive layer can be formed.

  The at least one plasticizer having a molecular weight of 380 or less used in the adhesive layer 3 of the non-combustible sheet 1 of the present invention is not particularly limited as long as the molecular weight is 380 or less. For example, phthalic acid ester compounds such as butyl benzyl phthalate (BBP), dibutyl phthalate (DBP), dimethyl phthalate (DMP), diethyl phthalate (DEP); diallyl phthalate (DAP), diallyl isophthalate, terephthalic acid Phthalic acid diallyl ester compounds such as diallyl; adipic acid ester compounds such as dioctyl adipate (DOA); benzoic acid ester compounds such as benzoic acid glycol ester (DEDB); tricresyl phosphate (TCP); triphenyl phosphate (TPP) And phosphate ester compounds such as cresyl diphenyl phosphate (CDP). These plasticizers may be used alone or in combination of two or more.

  The refractive index difference between the plasticizer having a molecular weight of 380 or less used in the adhesive layer 3 and the resin composition constituting the glass cloth 2 or the thermoplastic resin layer 4 is 0.06 or less, preferably 0.05 or less. Yes, and more preferably 0.03 or less. Therefore, the refractive index of the plasticizer is desirably 1.44 to 1.66, preferably 1.45 to 1.65, and more preferably 1.47 to 1.63. If the refractive index of the plasticizer is within the above range, the transparency can be improved.

  For the purpose of bringing the refractive index of the adhesive layer 3 close to the refractive index of the glass fiber constituting the glass cloth 2 and the refractive index of the thermoplastic resin constituting the thermoplastic resin layer, butylbenzyl phthalate is used as a plasticizer having a molecular weight of 380 or less. It is preferable to use (BBP).

  The plasticizer used in the adhesive layer 3 may contain a plasticizer having a molecular weight greater than 380 in addition to a plasticizer having a molecular weight of 380 or less. For example, dioctyl phthalate (DOP), diisononyl phthalate (DINP), diisodecyl phthalate (DIDP), diisononyl adipate (DINA), tris phosphate (TXP), resorcinol bisdiphenyl phosphate (RDP), bisphenol A bisdiphenyl phosphate (BDP), and the like. These plasticizers may be used alone or in combination of two or more.

  The content of all plasticizers contained in the thermoplastic resin composition constituting the adhesive layer 3 is not particularly limited, but is preferably 30% by mass or more, preferably with respect to the total amount of the resin composition constituting the adhesive layer. Is 50 mass% or more, more preferably 60 mass% or more, and the upper limit is 80 mass% or less, preferably 70 mass% or less. If content of the plasticizer contained in the contact bonding layer 3 is the said range, the thermoplastic resin composition which comprises the contact bonding layer 3 can be made into a sol state, and can be easily impregnated into a glass fiber fabric.

  The adhesive layer 3 is filled with other synthetic resins and, if necessary, stabilizers, ultraviolet absorbers, hindered amine light stabilizers, antioxidants, slip agents, colorants, and fillers as long as the effects of the present invention are not impaired. An agent, a nucleating agent, a flame retardant, an antibacterial agent, a refractive index adjusting agent and the like may be added.

The coating amount of the adhesive layer 3 is 10.0 g / m ² or more, preferably 20 g / m ² or more, more preferably 30 g / m ² or more, 60 g / m ² or less, preferably 50 g / m ² or less, and Preferably it is 40 g / m ² or less. If the coating amount of the adhesive layer 3 is within the above range, it is preferable to prevent the adhesive layer from being impregnated into the glass cloth and overflowing excess.

(Thermoplastic resin layer)
The thermoplastic resin used in the thermoplastic resin layer 4 of the incombustible sheet 1 of the present invention can approximate the refractive index of the glass fiber of the thermoplastic resin composition constituting the adhesive layer 3 and the glass cloth 2. If there is, it will not be specifically limited. Preferred thermoplastic resins include, for example, polyvinyl chloride resins, polyester resins, polyolefin resins, acrylic resins, polycarbonate resins, polyvinyl alcohol resins, ethylene vinyl acetate copolymers, polyamide resins, polyarylate resins, and the like. For example, when alkali-free glass fiber is used as the glass fiber constituting the glass fiber fabric, from the viewpoint of refractive index, among these, polyvinyl chloride resin, polyester resin, and acrylic resin are preferable, and polyvinyl chloride resin is more preferable. . A thermoplastic resin may be used individually by 1 type, and may be used in combination of 2 or more types from which refractive index differs in order to approximate the refractive index of the glass fiber to be used.

  The thermoplastic resin layer 4 may contain a plasticizer for imparting flexibility. The plasticizer used in the thermoplastic resin layer 4 is not particularly limited. Examples include phthalic acid ester compounds, adipic acid ester compounds, trimetic acid ester compounds, adipic acid polyester compounds, phthalic acid polyester compounds, terephthalic acid ester compounds, phosphoric acid ester compounds, etc. From the viewpoint of versatility and cold resistance Diisononyl adipate (DINA) is preferred.

  The plasticizer contained in the thermoplastic resin layer 4 can be used within a range that does not impair the properties of the thermoplastic resin to be used, and is preferably 50% by mass or less based on the total amount of the thermoplastic resin layer 4, and is nonflammable. From the viewpoint of preventing blocking of the adhesive sheet, it is preferably 35% by mass or less.

  In addition, the thermoplastic resin layer 4 includes, for example, a flame retardant, an ultraviolet absorber, a hindered amine light stabilizer, a filler, an antistatic agent, a colorant, an antibacterial agent in addition to the plasticizer to the extent that the effects of the present invention are not impaired. Additives such as agents, stabilizers, slip agents and the like may be further included.

  The thermoplastic resin layer 4 is preferably embossed on the surface of the adhesive layer for the purpose of improving adhesion to the glass cloth and allowing the thermoplastic resin composition of the adhesive layer to penetrate into the glass cloth. Specifically, the surface roughness Ra on the adhesive layer side of the thermoplastic resin layer is 0.5 μm or more, preferably 1.0 μm or more, more preferably 3.0 μm or more, and 15.0 μm or less, preferably 12 It is desirable that the thickness be 0.0 μm or less, more preferably 10.0 μm or less.

  The thickness of the thermoplastic resin layer 4 is not particularly limited, but is about 0.05 to 0.20 mm, preferably 0.08 to 0.15 mm, from the viewpoint of maintaining transparency and nonflammability. If the thermoplastic resin layer 4 is too thick, the incombustibility is lowered. On the other hand, if the thermoplastic resin layer 4 is too thin, wrinkles are likely to occur, and the uneven shape of the glass cloth tends to appear on the surface of the incombustible sheet.

(Non-combustible sheet)
Although it does not restrict | limit especially as thickness of the non-combustible sheet 1 whole of this invention, From a viewpoint of maintaining transparency, a softness | flexibility, and a cutting property, it is 0.45 mm or less, Preferably it is 0.40 mm or less, More preferably, it is 0. .35 mm or less.

The nonflammable sheet 1 of the present invention may be partially transparent, and the average value of the total light transmittance at a wavelength of 400 nm to 700 nm is 75% or more, preferably 80% or more, and more preferably 85% or more. In order to further improve the transparency, the difference between the refractive index of the glass fiber constituting the glass fiber fabric and the refractive index of the adhesive layer of the thermoplastic resin composition is preferably 0.06 or less.
Moreover, a part may be opaque by printing or coloring. In addition, various surface treatments such as hairline treatment, embossing treatment, hard coat treatment, antifouling treatment, antistatic treatment, and heat shielding treatment may be performed.

  The incombustibility of the incombustible sheet 1 of the present invention varies depending on the composition of the adhesive layer 3 and the thermoplastic resin layer 4, but the thickness and woven density of the glass cloth 2 are obtained so that desired incombustibility and transparency can be obtained. The composition of the adhesive layer 3 and the thickness of the thermoplastic resin layer 4 can be set.

The incombustible sheet 1 of the present invention has a total heat generation amount of 8 MJ / m ² or less in the heating start 20 minutes in the exothermic test in which the surface of the sheet is irradiated with 50 kw / m ² of radiant heat and the heating start 20 minutes. In addition, the maximum heat generation rate can be imparted with nonflammability of less than 200 kw / m ² for 10 seconds or more. Such a non-combustible transparent non-combustible sheet is preferable because it can be certified as a non-combustible material as stipulated in the Building Standard Law.

  The incombustible sheet 1 of the present invention can be used as a smoke-proof hanging wall, a smoke-shielding screen, a sheet used for partitioning a smoke-proof partition wall, a smoke-proof curtain, a warehouse or a factory, a transparent blind, and the like. The non-combustible sheet 1 of the present invention is suitably used for a smoke-proof hanging wall, a smoke-proof screen, a smoke-proof partition wall or a smoke-proof curtain.

The manufacturing method of the incombustible sheet 1 of the present invention includes the step 1 of forming the adhesive layer 3 on one surface of the thermoplastic resin layer 4 and the adhesion of the thermoplastic resin layer 4 formed with the adhesive layer 3 obtained in the step 1 above. It is preferable to include the step 2 of laminating the glass cloth 2 on the layer 3 and laminating the glass cloth 2, the adhesive layer 3, and the thermoplastic resin layer 4.
As a specific example, a sol-like resin composition containing a polyvinyl chloride (PVC) paste resin and at least one plasticizer having a molecular weight of 380 or less on one surface of a thermoplastic resin film as the thermoplastic resin layer 4 is provided. The adhesive layer 3 is formed by coating (Step 1), and the adhesive layer 3 of the thermoplastic resin layer 4 having the adhesive layer 3 formed on both surfaces of the glass cloth 2 is laminated (Step 2-1), and then the glass cloth The non-combustible sheet 1 is obtained by bonding a pair of thermoplastic resin layers 4 and 4 to both surfaces of 2 by thermocompression bonding via the adhesive layer 3 (step 2-2).

  Moreover, since the adhesive layer 3 can be impregnated into the glass cloth 2 and solidified in a gel state by using heat and pressure at the time of bonding, it is cured by applying thermal energy or light energy in a separate process. There is no need, and the power cost can be reduced. Further, bubbles contained in the glass cloth 2 can be discharged and removed to the outside by heating and pressurization.

  A transparent non-combustible sheet in which a conventional glass fiber fabric is placed inside a curable resin plate is coated with a curable resin on one side of a process film such as a polyethylene terephthalate film, and the curable resin layer is formed on the formed curable resin layer. A glass fiber fabric is stacked, and a new process film is stacked on the glass fiber fabric, and the glass fiber fabric is impregnated with the curable resin of the curable resin layer by pressing. Next, after the curable resin is cured by heat or light, the process films on both sides are peeled off, and then a reinforcing sheet made of, for example, a flame retardant vinyl chloride resin is pasted on both sides using a urethane adhesive. It was manufactured by the method of attaching.

  Since the transparent noncombustible sheet obtained by the conventional manufacturing method has many steps and used a process film, it is necessary to dispose of the peeled process film. For this reason, the conventional manufacturing method has a problem that the manufacturing cost and the disposal cost are required. Moreover, in the conventional manufacturing method, since it was necessary to harden | cure by giving a thermal energy and light energy, there also existed a problem that electric power cost started.

  In the present invention, since the glass cloth 2, the adhesive layer 3, and the thermoplastic resin layer 4 can be manufactured through the above-described steps 1 and 2, there is no need to use a process film, and the manufacturing cost and disposal A transparent incombustible sheet with reduced costs can be easily produced.

  Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the examples.

<Material constituting each layer>
1. Thermoplastic resin layer [thermoplastic resin]: polyvinyl chloride resin (ZEST-1300Z; manufactured by Shin-Daiichi PVC Co., Ltd.)
[Plasticizer 1]: Diisononyl adipate (DINA; manufactured by JPLUS)
[Flame Retardant]: Phosphate ester (Reophos-65; manufactured by Ajinomoto Fine Techno Co., Ltd.)
[Stabilizer]: Ba—Zn stabilizer (manufactured by ADEKA)
[Ultraviolet absorber]: Benzophenone ultraviolet absorber (Kimasoap 81; manufactured by BASF Japan Ltd.)
[Pigment]: MP MKV 073 Blue (manufactured by Dainichi Seika Kogyo Co., Ltd.)

2. Material used for adhesive layer [polyvinyl chloride (PVC) paste resin]: PSH-161 (manufactured by Kaneka Corporation)
[Plasticizer 2]: Butylbenzyl phthalate (BBP) (manufactured by Ferro Japan)
[Plasticizer 3]: Dioctyl phthalate (DOP) (J-Plus)
[Curable resin]: Vinyl ester resin (manufactured by Iupika Japan)
[Stabilizer]: Ba—Zn stabilizer (manufactured by ADEKA)

3. Glass cloth 1067 (Arisawa Fiber Glass)
1080 (Arisawa Fiber Glass Co., Ltd.)
2116 (Unitika)

<Example>
[Production of thermoplastic resin film]
(Film A)
65.6% by weight of polyvinyl chloride resin, 13.8% by weight of plasticizer 1, 2.62% by weight of stabilizer, 0.66% by weight of ultraviolet absorber, 17.1% by weight of flame retardant, charging Add 0.07% by mass of inhibitor, 0.03% by mass of slip agent, and 0.12% by mass of pigment, mix using a Henschel mixer, and use polyvinyl chloride resin film A with a calendar molding machine. Was made.
(Film B)
58.5% by weight of polyvinyl chloride resin, 4.69% by weight of plasticizer 1, 2.35% by weight of stabilizer, 0.24% by weight of UV absorber, 33.9% by weight of flame retardant, charging Add 0.07% by weight of inhibitor, 0.13% by weight of slip agent and 0.12% by weight of pigment, mix using Henschel mixer, and use polyvinyl chloride resin film with calender machine B was produced.

[Coating adhesive layer]
Polyvinyl chloride (PVC) paste resin and plasticizer 2 or plasticizers 2 and 3 are blended in the proportions shown in Table 1, and 1% by mass of Ba-Zn stabilizer is added and mixed to form an adhesive layer. A resin composition was prepared, and an adhesive layer was formed using the resin composition.
Comparative Example 2 did not contain polyvinyl chloride (PVC) paste resin and plasticizers 2 and 3, and a resin composition using a vinyl ester resin (curable resin) was used as the resin composition for the adhesive layer.

[Production of transparent incombustible sheet]
The resin composition which comprises the contact bonding layer shown in Table 1 was apply | coated to the said film A and the film B, and the laminated body which distribute | arranged the contact bonding layer and the film A or the film B on both surfaces of the glass fiber fabric was produced. Thereafter, the film A or the film B, the adhesive layer, and the glass fiber woven fabric were nipped with a metal roll and a rubber roll set at 160 ° C. to produce a transparent noncombustible sheet.
The following evaluation was performed about the obtained transparent incombustible sheet. The evaluation results are shown in Table 1.

<Evaluation of nonflammability>
Beyond the produced transparent incombustible surface of the sheet, in radiant electric heater irradiating radiant heat of 50 kw / m ^2, the total calorific value of the heating start after 20 minutes, the heating value in the start of heating after 20 minutes a 200 kW / m ² The time was measured. If the total calorific value is 8 MJ / m ² or less and the time exceeding 200 kw / m ² continues for less than 10 seconds, the nonflammability evaluation is “◯”, and if it exceeds, “×” It was.

<Evaluation of transparency>
The total light transmittance (average value of wavelengths 400 to 700 nm) of the produced transparent incombustible sheet was measured using a spectrophotometer UV-3500 manufactured by Hitachi, Ltd. When the total light transmittance is 90% or more, the transparency is evaluated as “◎”. When the total light transmittance is 80% or more and less than 90%, “◯”, and when it is 60% or more and less than 80%, “△”. , “X” when less than 60%.

<Evaluation of blocking properties>
Two pieces of the produced transparent incombustible sheet were cut into a size of 10 cm square, and in a state where the two sheets were overlapped, a test piece was obtained by sandwiching between two stainless steel plates of 3 mm thickness and 10 cm square. The test piece was subjected to a load of 20 kg per 100 cm ^{2 and} allowed to stand in a constant temperature room at 50 ° C. for 24 hours, and then the incombustible sheet was peeled off to evaluate the blocking state. “◎” indicates that the sheet can be peeled without resistance, “◯” indicates that the sheet has resistance but can be removed somehow, and “x” indicates that the sheet cannot be strongly peeled.

<Evaluation of flexibility>
The flexibility of the produced transparent incombustible sheet was evaluated by the JIS L 1096A method (45 ° cantilever method). Place the test piece on a smooth horizontal platform with a 45 ° slope, align one end of the test piece with the boundary with the slope, hold the test piece gently with a metal plate, and center the tip of the test piece. The scale when touching the slope was read. When the scale was 40 mm or less, “◎”, when it was larger than 40 mm but not more than 60 mm, “◯”, when it was larger than 60 mm and not more than 80 mm, “Δ”, when it was larger than 80 mm, “×”.

  As shown in Table 1, if the glass composition in the range specified in the present invention and the resin composition constituting the adhesive layer are used, a low-cost incombustible sheet having transparency, flexibility, blocking property and incombustibility is obtained. It can be produced by an easy production method (Examples 1 to 5). On the other hand, when the resin composition constituting the adhesive layer does not contain a plasticizer having a molecular weight of 380 or less, and when a glass cloth outside the range specified in the present invention is not used, the non-combustible sheet with poor transparency and (Comparative Examples 1 and 3). Further, when the adhesive layer was not a polyvinyl chloride (PVC) paste resin, the flexibility was inferior and the production cost was increased (Comparative Example 2).

  The non-combustible sheet of the present invention is a transparent non-combustible sheet that is easy to manufacture and low in cost, does not generate waste in the manufacturing process, and has excellent transparency, non-combustibility, flexibility, and cutting properties. It can be suitably used for smoke barriers and smoke screens / curtains.

1 Incombustible sheet 2 Glass cloth 3 Adhesive layer 4 Thermoplastic resin layer

Claims (12)

A non-combustible sheet formed by laminating a thermoplastic resin layer on both sides of a glass cloth with an adhesive layer,
The glass fiber count in the glass cloth is 3 to 20 tex, and the total density of the warp and the weft is 80/25 mm to 190/25 mm,
The adhesive layer is made of a resin composition containing a polyvinyl chloride (PVC) paste resin and at least one plasticizer having a molecular weight of 380 or less. The content is 30 to 80% by mass, and
A nonflammable sheet characterized by having a total light transmittance of 75% or more.   The incombustible sheet according to claim 1, wherein a difference in refractive index between the plasticizer and the resin composition constituting the glass cloth and the thermoplastic resin layer is 0.06 or less.   The nonflammable sheet according to claim 1, wherein the plasticizer is mainly composed of a phthalate ester plasticizer.   The said thermoplastic resin layer is comprised with the resin composition containing a vinyl chloride-type resin and a plasticizer, and the content rate of the plasticizer with respect to the gross mass of the said thermoplastic resin layer is 50 mass% or less, The Claims 1-3 The nonflammable sheet according to any one of the above.   The non-combustible sheet according to any one of claims 1 to 4, wherein surface roughness Ra of the thermoplastic resin layer on the adhesive layer side is 0.5 to 15.0 µm.   The nonflammable sheet according to any one of claims 1 to 5, wherein the thermoplastic resin layer has a thickness of 0.05 to 0.20 mm. The coating amount of the adhesive layer is 10.0~60.0g / ^{m 2,} incombustible sheet according to any one of claims 1 to 6.   The nonflammable sheet according to any one of claims 1 to 7, wherein the entire sheet has a thickness of 0.45 mm or less.     The nonflammable sheet according to any one of claims 1 to 8, which is used for any one of a smoke-proof hanging wall, a smoke-shielding screen, a smoke-proof partition wall, and a smoke-proof curtain.     A smoke-proof hanging wall using the non-combustible sheet according to claim 1.   A smoke-proof screen curtain using the non-combustible sheet according to claim 1.   Step 1 of forming an adhesive layer on one surface of the thermoplastic resin layer, and laminating a glass cloth on the adhesive layer of the thermoplastic resin layer formed with the adhesive layer obtained in Step 1, the glass cloth and the thermoplastic The process 2 which laminates a resin layer through an contact bonding layer, The manufacturing method of the nonflammable sheet | seat in any one of Claims 1-9 characterized by the above-mentioned.

Images