JP3256019B2 - Flame retardant sheet material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material having excellent flame retardancy, excellent surface smoothness and excellent concealability of a base.

[0002]

2. Description of the Related Art In recent years, glass insulation mats have been widely used as building materials and interior materials. However, these glass insulation mats are required to prevent scattering of fine glass fiber as a raw material, workability and design. Surfacer material is used on the surface. Previously, asbestos paper and asphalt-impregnated paper were used as this surfacer material, but their use has been rapidly limited due to environmental and sanitary problems.

[0003] As the surfacer material, a material using glass or other inorganic fiber non-woven fabric has been proposed. For example, Japanese Patent Application Laid-Open No. 57-205600 proposes a method in which alumina sol is mixed during sheet forming. The amount of alumina sol adhering to and remaining on the surface, the so-called yield, is limited and the flame retardant effect is insufficient.

Japanese Patent Application Laid-Open No. 54-68470 proposes to use a silicone resin as a non-combustible resin. However, in order to obtain a desired flame-retardant effect, a large amount of resin is required in the sheet material. In addition, the silicone resin itself is soft and the strength of the sheet material itself is not sufficient.

[0005]

SUMMARY OF THE INVENTION A glass heat insulating mat formed of long fiber glass wool is designed to prevent fine glass fibers from scattering from the surface and to improve the design after construction.
It is used with a surfacer material attached to its surface, but in recent years the flame retardancy standards have been strengthened and it has become clear that it is difficult for conventional surfacer materials to pass such standards.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a flame-retardant sheet material impregnated with a primary binder mainly formed of glass fiber, wherein a polyvinylidene chloride- based binder is used as a secondary processing binder for the flame-retardant sheet material. Resin is used, the blending ratio of the polyvinylidene chloride- based resin is 2 to 15% by weight based on the weight of the flame-retardant sheet material, and the limiting oxygen index of the polyvinylidene chloride- based resin is 30 or more. > Oh is, and, total organic content of 20 double of the flame-retardant sheet material
% Or less .

Further, the sheet contains an inorganic powder containing a flame-retardant sheet.
Wherein the inorganic powder is aluminum hydroxide having a particle size of 0.5 to 5 μm in an amount of 10 to 30% by weight based on the weight of the material.

The polyvinylidene chloride resin used in the present invention includes, for example, polyvinylidene chloride, vinylidene chloride / acrylic copolymer, ethylene / vinylidene chloride copolymer and the like. If it is less than 2% by weight of the original fabric impregnated with the binder, there is a problem in the effect of exhibiting flame retardancy.

Further, the limiting oxygen index of polyvinylidene chloride-based resin is preferably 30 or more points of the flame retardant on the sheet material is not preferred in view of the expression effect of flame retardancy is 30 or less.

An inorganic powder is mixed with a primary binder to be impregnated into a glass sheet formed from chopped strand glass fibers. Examples of the inorganic powder include aluminum hydroxide, talc, clay, and kaolin. Preferred is aluminum hydroxide.

The adhesive used for the primary binder is preferably an acrylic latex, for example, an acrylate copolymer, a styrene-acryl copolymer,
Examples include urethane / acrylic copolymers and polymethyl methacrylate.

The particle size of the inorganic powder is 0.5 to 5 μm.
When the thickness is 0.5 μm or less, it is not preferred in terms of yield. If it is 5 μm or more, there is a problem in the smoothness of the sheet surface.

Further, the content of the inorganic powder is preferably from 10 to 30% by weight with respect to the glass sheet. 30
When the content is more than the weight%, it is not preferable in terms of sheet strength and powder falling off the sheet.

The total organic content of the sheet is 20% by weight.
The following is preferable, and if it is 20% by weight or more, the flame retardancy is reduced, which is not preferable.

[0015]

Next, the present invention will be described in more detail with reference to examples. All parts and percentages shown below are based on weight.

Example 1 (1) Preparation of Secondary Fabric for Fabrication 20 g of chopped strand glass having a fiber diameter of 9 μm and a fiber length of 13 mm was put into 5 l of water, and 0.5 l of a 0.2% polyacrylamide aqueous solution was further added. In addition, the mixture was stirred with a reciprocating agitator for 15 minutes to obtain a slurry having a concentration of 0.36%. 0.3 liter of the resulting slurry was put into a square hand box, diluted to a 10-fold concentration, and then dehydrated.
A glass sheet of 7 g / m ² was obtained. 8 g / m1 of the primary binder having the following composition was added to the glass sheet.
⁽²⁾ Impregnated to prepare a fabric for secondary processing with a basis weight of 35 g / m ² . Aluminum hydroxide (particle size: 0.5 μm) 50% dispersion 125 parts Acrylic latex (HA-16 45% liquid manufactured by Nippon Acrylic) 83 parts Water 500 parts

(2) Preparation of Binder for Secondary Processing A binder for secondary processing having the following composition was impregnated with 5 g / m ^{2 of the} original cloth to obtain a sheet having a basis weight of 40 g / m ² . Asahi Kasei Saran Latex L108A (Liquid oxygen index 30 50% solution) 30 parts Water 200 parts The finished sheet has self-extinguishing properties, no fuzziness of glass fiber, excellent surface smoothness, and excellent concealment of the base. I was The evaluation results are shown in Table 1.

Example 2 (1) Preparation of Fabric for Secondary Processing To a glass sheet having a basis weight of 27 g / m ² obtained in the same manner as in Example 1, 8 g / g of a primary binder represented by the following composition was added. m ^{2 was} impregnated to obtain a fabric for secondary processing with a basis weight of 35 g / m ² . Aluminum hydroxide (particle diameter 2.5 μm) 50% dispersion 125 parts Acrylic latex (HA-16 45% liquid manufactured by Nippon Acrylic) 83 parts Water 500 parts

(2) Preparation of Secondary Processing Binder The same secondary processing binder as in Example 1 was impregnated with 5 g / m ^{2 of the} original fabric to obtain a sheet having a basis weight of 40 g / m ² . The resulting sheet had self-extinguishing properties, no fluff of glass fiber, excellent surface smoothness, and excellent base layer hiding. The evaluation results are shown in Table 1.

Example 3 (1) Preparation of a Fabric for Secondary Processing To a glass sheet having a basis weight of 27 g / m ² obtained in the same manner as in Example 1, 8 g / g of a primary binder represented by the following composition was added. m ^{2 was} impregnated to obtain a fabric for secondary processing with a basis weight of 35 g / m ² . Aluminum hydroxide (particle size: 5.0 μm) 50% dispersion 125 parts Acrylic latex (HA-16 45% solution manufactured by Nippon Acrylic) 83 parts Water 500 parts

(2) Preparation of Secondary Processing Binder The same secondary processing binder as in Example 1 was impregnated with 5 g / m ² of the above-mentioned base cloth to obtain a sheet having a basis weight of 40 g / m ² . The resulting sheet had self-extinguishing properties, no fuzz of glass fiber, excellent surface smoothness, and excellent hiding of the substrate. The evaluation results are shown in Table 1.

Example 4 (1) Preparation of a Fabric for Secondary Processing To a glass sheet with a basis weight of 27 g / m ² obtained in the same manner as in Example 1, 8 g / g of a primary binder represented by the following composition was added. m ^{2 was} impregnated to obtain a fabric for secondary processing with a basis weight of 35 g / m ² . Aluminum hydroxide (particle diameter 0.5 μm) 50% dispersion 175 parts Acrylic latex (HA-16 45% liquid manufactured by Nippon Acrylic) 28 parts Water 500 parts

(2) Preparation of a binder for secondary processing The same binder for secondary processing as in Example 1 was impregnated with 5 g / m ^{2 of the} original fabric to obtain a sheet having a basis weight of 40 g / m ² . The resulting sheet had self-extinguishing properties, no fuzz of glass fiber, excellent surface smoothness, and excellent hiding of the substrate. The evaluation results are shown in Table 1.

Example 5 ² with a basis weight of 35 g / m ² obtained in the same manner as in Example 1.
A secondary processing binder having the following composition was impregnated into the raw fabric for subsequent processing at 5 g / m ² to obtain a sheet having a basis weight of 40 g / m ² . Asahi Kasei Saran Latex L115A (Limiting oxygen index: 43 50% solution) 30 parts Water 200 parts The finished sheet has self-extinguishing properties, has no fuzziness of glass fiber, has excellent surface smoothness, and has excellent base layer hiding. I was The evaluation results are shown in Table 1.

Example 6 (1) Preparation of Secondary Fabric for Fabrication 0.33 l of the same slurry as in Example 1 was put into a square hand-made box, further diluted to 10-fold concentration, dehydrated, and dried. A glass sheet of 30 g / m ² was obtained. The same primary binder as in Example 1 was applied to the above glass sheet at 8 g / m2.
² to obtain a fabric for secondary processing with a basis weight of 38 g / m ² .

(2) Preparation of Binder for Secondary Processing A binder for secondary processing having the following composition was impregnated with ² g / m ^{2 of the} original fabric to obtain a sheet having a basis weight of 40 g / m ² . Asahi Kasei Saran Latex L108A (Limited oxygen index: 30 50% solution) 10 parts Water 200 parts The finished sheet has self-extinguishing properties, has no fuzziness of glass fiber, has excellent surface smoothness, and has excellent concealment of the base. I was The evaluation results are shown in Table 1.

COMPARATIVE EXAMPLE 1 (1) Preparation of a Fabric for Secondary Processing To a glass sheet having a basis weight of 27 g / m ² obtained in the same manner as in Example 1, 8 g / g of a primary binder represented by the following composition was added. m ^{2 was} impregnated to obtain a fabric for secondary processing with a basis weight of 35 g / m ² . Aluminum hydroxide (particle diameter 10.0 μm) 50% dispersion 125 parts Acrylic latex (HA-16 45% liquid manufactured by Nippon Acrylic) 83 parts Water 500 parts

The same secondary fabric binder as in Example 1 was impregnated with 5 g / m ² of the above-mentioned original fabric and a basis weight of 40 g / m ^2.
Sheet was obtained. The finished sheet had slightly poor self-extinguishing properties, and was inferior in concealability and surface smoothness of the substrate. This is presumably because the specific surface area, which is considered to contribute to the self-extinguishing property by increasing the particle size of the aluminum hydroxide, is reduced, and the packing density of the particles is reduced even with the same weight blending. The evaluation results are shown in Table 1.

COMPARATIVE EXAMPLE 2 (1) Preparation of Secondary Fabric for Fabrication 0.33 liters of the same slurry as in Example 1 was put into a square hand-made box, diluted to a 10-fold concentration, dehydrated, and dried. A glass sheet of 30 g / m ² was obtained. The primary binder represented by the following composition was 8 g /
m ^{2 was} impregnated to obtain a fabric for secondary processing with a basis weight of 38 g / m ² . Aluminum hydroxide (particle size: 0.5 μm) 50% dispersion 50 parts Acrylic latex (HA-16 45% liquid manufactured by Nippon Acrylic) 167 parts Water 500 parts

(2) Preparation of Binder for Secondary Processing A binder for secondary processing having the following composition was impregnated with ² g / m ^{2 of the} original fabric to obtain a sheet having a basis weight of 40 g / m ² . Asahi Kasei Saran Latex L108A (Liquid oxygen index: 30 50% solution) 10 parts Water 200 parts The resulting sheet was inferior in self-extinguishing properties, surface smoothness and base hiding properties. This is presumably because the absolute amount of aluminum hydroxide in the sheet was small. The evaluation results are shown in Table 1.

Comparative Example 3 A 2 having a basis weight of 35 g / m ² obtained in the same manner as in Example 1.
A secondary processing binder having the following composition was impregnated into the raw fabric for subsequent processing at 5 g / m ² to obtain a sheet having a basis weight of 40 g / m ² . 30 parts of Diknal E516 (Liquid oxygen index 2650% liquid) manufactured by Dainippon Ink and 200 parts of water The finished sheet did not exhibit self-extinguishing properties.
This is presumably because the secondary processing binder had a small limiting oxygen index and did not contribute to the self-extinguishing property.

COMPARATIVE EXAMPLE 4 (1) Preparation of a Fabric for Secondary Processing To a glass sheet having a basis weight of 27 g / m ² obtained in the same manner as in Example 1, 8 g / m ^{2 was} impregnated to obtain a fabric for secondary processing with a basis weight of 35 g / m ² . 89 parts of 50% dispersion of aluminum hydroxide (particle size 0.5 μm) 80 parts of acrylic latex 45 (45% liquid of HA-16 manufactured by Nippon Acrylic) 500 parts of water

The above-mentioned fabric for secondary processing was impregnated with 5 g / m ² of the same binder as in Example 1, and the basis weight was 40 g / m ^2.
m ² sheets were obtained. The resulting sheet did not exhibit self-extinguishing properties, and was slightly inferior in surface smoothness and concealment of the underlayer. It is considered that this is because the organic content in the sheet is too high, and the mixing ratio of the powder particles is the lower limit at which the effect is exerted on the surface smoothness and the substrate hiding property.
The evaluation results are shown in Table 1.

[0034]

[Table 1]

The symbols in the table are as follows. The self-extinguishing property was implemented according to JIS A1322 (45 degree Meckelburner method). Self-extinguishing ○ Fire extinguishes within 5 seconds after releasing the ignition source Self extinguishing 消 Extinguishes the fire within 5 to 10 seconds after releasing the ignition source Self-extinguishing × No self-extinguishing even when the ignition source is released Surface smooth Good surface smoothness by visual judgment Surface smoothness: Slight irregularities on the surface are observed by visual judgment Surface smoothness × Many irregularities on the surface are observed by visual judgment Underground concealability ○ Visual judgment The base is hardly visible. The base concealing property △ The base is slightly seen through by visual judgment. The base concealing property × The base is almost seen by the visual judgment.

[0036]

As described above in detail, according to the flame-retardant sheet material of the present invention, as is clear from the results in Table 1, when used as a surfacer material of a glass heat insulating mat, the flame-retardant sheet material has a low flame retardancy. And a flame-retardant sheet material having excellent surface smoothness and excellent concealability of the underlayer.

Claims (2)

(57) [Claims] 1. A mainly in the flame retardant sheet material primary binder is impregnated formed from glass fibers, the
Inorganic powder with a particle size of 0.5 to 5 μm in the flame retardant sheet material
The body is 10 to 30 weight based on the weight of the flame retardant sheet material
% , And a polyvinylidene chloride-based resin is used as a binder for secondary processing of the flame-retardant sheet material. The blending ratio of the polyvinylidene chloride-based resin is 2 to 15% by weight based on the weight of the flame-retardant sheet material. %, And the limiting oxygen index of the polyvinylidene chloride-based resin is 30 or more, and the total organic content in the flame-retardant sheet material is 20% by weight or less. . 2. The method according to claim 1, wherein the inorganic powder is aluminum hydroxide.
The flame-retardant sheet material according to claim 1, characterized in that: