JP2003041758A - Floor finishing base material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor finishing material having a prescribed bending strength and water repellency, using a base material for a floor finishing material having same damage resistance or more as that of a floor finishing material of a MDF(medium density fiberboard) base material and same dimension stability or more as that of a floor finishing material of a plywood base material, and having superior flame retardancy and thermal conductivity in a sheet-form thermoforming body containing prescribed amounts of inorganic compound having endothermic degradability, cellulose fiber, inorganic fiber, and thermoplastic resin. SOLUTION: This base material for the floor finishing material comprises the sheet-form thermoforming body containing 50-90 mass% of the inorganic compound having endothermic degradability in solid, 2-27 mass% of the cellulose fiber in solid, 2-20 mass% of the inorganic fiber in solid, and 5-20 mass% of thermoplastic resin in solid. This base material is characterized in having 19 MPa or more in the bending strength (JIS A-5905) obtained by finding the average of the both measuring results in the fiber orientation direction and the direction orthogonally crossing therewith, 1-4 mm in the thickness, and the water repellency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base material for floor finishing material, and more particularly to a base material for floor finishing material which can be suitably used by being applied on a heating element for floor heating.

[0002]

2. Description of the Related Art Conventionally known base materials for floor finishing materials include
Generally, plywood or medium fiberboard (hereinafter MD
It is abbreviated as F. ) Is used. When used as an actual floor finishing material, it is common to use a decorative surface material such as a decorative veneer, printing paper, or vinyl chloride sheet, which is laminated and integrated on the surface of such a floor finishing material. is there.

[0003]

However, a floor finish made of a plywood base material is inferior in scratch resistance. That is, there is a drawback that tableware and the like are easily scratched and casters such as chairs are easily scratched. On the other hand, the floor finishing material using the MDF base material has a high surface hardness of MDF,
It has excellent scratch resistance and has the advantage that it is less likely to suffer drop impact scratches on tableware or the like and caster scratches on casters such as chairs, but has the drawback of poor dimensional stability against moisture or moisture absorption and desorption.

Further, an electric heater or a hot water heater is built in the heating element for floor heating, and when the electric heater is built in, there is a risk of catching fire and burning due to an electric short-circuit or the like, which may cause a fire. There is a demand for a base material for a floor finish that is excellent in However, the plywood base material or the MDF base material usually does not have flame retardancy.

Further, since the floor finishing material used for floor heating is required to have improved heat transfer efficiency from the viewpoint of energy saving, the base material for floor finishing material used for the same purpose also has as good thermal conductivity as possible. It is preferable to secure

[0006] Therefore, it has the same or more scratch resistance as the floor finishing material made of the MDF base material and the dimensional stability equal to or more than the floor finishing material made of the plywood base material, and at the same time, it has excellent flame retardancy and thermal conductivity. There was an urgent need to develop a base material for floor finishing materials that can realize floor finishing materials.

Therefore, the present inventor has conducted repeated diligent trial and error to solve the above problems, and found that a sheet form containing a predetermined amount of an endothermic decomposable inorganic compound, cellulose fiber, inorganic fiber and thermosetting resin. A base material for a floor finish material having a predetermined bending strength, water repellency, and a predetermined thickness, which is a thermocompression molded body, and a plywood having a scratch resistance equal to or higher than that of a floor finish material made of an MDF base material. The present invention has been completed by finding that it is possible to realize a floor finishing material having a dimensional stability equal to or higher than that of a floor finishing material made of a base material and also excellent in flame retardancy and thermal conductivity.

[0008]

The base material for floor finishing material according to the present invention comprises an inorganic compound having an endothermic decomposability in a solid content of 5%.
0 to 90% by mass and cellulose fiber in solid content of 2 to 17
A sheet-like thermocompression molded body containing 2% by mass to 20% by mass of inorganic fibers and 5% to 20% by mass of thermosetting resin in a solid content, and a fiber orientation direction and this. The bending strength (according to JIS A-5905) obtained by measuring in a direction forming a right angle and averaging the two is 19 MPa or more, has water repellency, and has a thickness of 1 to 4 mm.

As the above-mentioned endothermic decomposable inorganic compound, one or both of a hydrous inorganic compound and a carbonate may be used in combination. Examples of the above-mentioned hydrated inorganic compound include aluminum hydroxide, magnesium hydroxide, calcium hydroxide, gypsum dihydrate, calcium aluminate and the like. Each of these compounds has water of crystallization in the molecule and has a chemically similar structure. Further, the hydrous inorganic compounds have some differences in decomposition temperature and heat absorption depending on the type, but they are quite common in that they decompose when heated at a high temperature and exhibit a flame retarding effect by an endothermic action. Therefore, basically, any of the above-mentioned hydrated inorganic compounds may be used, but aluminum hydroxide is most suitable in consideration of economical efficiency such as availability.

Examples of the carbonate used in the present invention include calcium carbonate, magnesium carbonate, barium carbonate, strontium carbonate, beryllium carbonate and zinc carbonate. These carbonates have some differences in the decomposition temperature and the amount of heat absorption depending on their types, but they are quite common in that they decompose when heated at a high temperature and exhibit a flame retarding effect by an endothermic action. Therefore, basically, any of the above-mentioned carbonates may be used, but calcium carbonate is most suitable in consideration of economical efficiency such as availability. As another important effect of the addition of carbonate, the present inventor has described in Japanese Patent Laid-Open No. 5-112
The effect of reducing the amount of smoke, which is pointed out in Japanese Patent No. 659, can be mentioned.

The inorganic compound having endothermic decomposability in the base material for floor finishing material according to the present invention is 50 to 90% by mass in solid content. It is preferably 55 to 85% by mass, more preferably 60 to 80% by mass. If the content is less than 50% by mass, sufficient flame retardancy cannot be obtained. On the other hand, if it exceeds 90% by mass, it is not suitable because sufficient paper-making property or mechanical strength cannot be obtained due to an excess of inorganic substances. In addition, the inorganic compound having endothermic decomposability in the base material for floor finishing material is solid content 55
It becomes easy to secure sufficient flame retardancy and paper-making property or mechanical strength by making it into the range of -85 mass%, and it becomes more sufficient flame-retardant and paper-making property by making it the range of 60-80 mass%. It becomes easier to secure the mechanical strength.

As the above-mentioned cellulose fibers, one or two selected from among softwood-based or hardwood-based chemical pulp, mechanical pulp, wood pulp such as semi-chemical pulp or cotton pulp, hemp pulp, and various waste papers.
It may be used in combination with more than one kind. Wood pulp is the most easy-to-use cellulose fiber raw material because of its stable supply and quality and its relatively low price. The supply amount of cotton pulp and hemp pulp is unstable and the price is expensive, but in a sheet-like thermocompression molded body containing a large amount of an endothermic decomposable inorganic compound as in the present invention, if necessary, By using the cotton pulp or hemp pulp, it is possible to minimize the decrease in mechanical strength of the sheet-shaped thermocompression molded body.

The content range of the cellulose fibers in the base material for floor finishing material according to the present invention is 2 to 17% by mass, preferably 4 to 13% by mass, and more preferably 5 to 10% by mass in terms of solid content. If the content is less than 2% by mass, sufficient paper-making properties cannot be obtained due to the insufficient amount of cellulose fibers, and
The mechanical strength is also insufficient. On the other hand, if it exceeds 17% by mass, sufficient dimensional stability cannot be obtained, and sufficient flame retardancy cannot be obtained due to the excess of organic substances. In addition,
When the content of cellulose fibers in the base material for floor finishing material is more than 15% by mass and 17% by mass or less, the dimensional stability upon immersion in water is slightly lacking, but the dimensional stability during drying and moisture absorption, scratch resistance, and difficulty Since the flammability, the thermal conductivity and the bending strength are all good, it can be used according to the application, and when the content of the cellulose fiber is in the range of 4 to 13% by mass, the papermaking property is sufficient. It is easy to ensure mechanical strength and dimensional stability, and flame resistance. In addition, the content rate of the cellulose fiber in the base material for floor finishing material is 5 to 10
By setting the content in the range of mass%, it becomes easier to secure sufficient papermaking properties, mechanical strength, dimensional stability, and flame retardancy.

As the above-mentioned thermosetting resin, at least one kind is selected from phenol resin, melamine resin, epoxy resin, urea resin, urea melamine resin and unsaturated polyester resin (including fibrous resin). To use. These thermosetting resins have some differences in curing temperature depending on the type, but due to the flow hardening effect associated with heat treatment, various molding shaping effects or various strength development effects or curved surface workability can be applied to flame-retardant materials. Furthermore, they are quite common in that they provide the effect of preventing the inorganic compounds having endothermic decomposability from falling off. Therefore, basically, any of the thermosetting resins described above may be used, but preferably the curing temperature of the thermosetting resin used is lower than the decomposition temperature of the inorganic compound having endothermic decomposability used in combination. Should be. Furthermore, considering the economics such as acquisition price, phenol resin,
Melamine resin, urea / melamine resin, etc. are most suitable.

The content range of the thermosetting resin in the base material for floor finishing material according to the present invention is 2 to 20% by mass, preferably 6 to 17% by mass, more preferably 7 to 15% by mass in terms of solid content.
Is. If the content is less than 5% by mass, the effect of preventing the removal of inorganic compounds having sufficient mechanical strength and endothermic decomposability cannot be obtained, and if it exceeds 20% by mass, sufficient flame retardance is caused by an excess of organic substances. I can't get sex. In addition,
The content of the thermosetting resin in the base material for floor finishing material is 6 to 17
When the content is within the range of 7% by mass, it is easy to ensure the effect of preventing the inorganic compound from having a drop in mechanical strength and endothermic decomposability, and it is also easy to ensure flame retardancy.
When the content is in the range of mass%, it becomes easier to secure the flame retardancy and the effect of preventing the inorganic compound from dropping off, which has sufficient mechanical strength and endothermic decomposability. As the above-mentioned inorganic fiber,
At least one selected from glass fiber, rock wool fiber, ceramic fiber, carbon fiber and the like is used.

The content range of the inorganic fibers in the base material for floor finishing material according to the present invention is 2 to 20% by mass, preferably 3 to 17% by mass, and more preferably 4 to 15% by solid content.
When the content is less than 5% by mass, sufficient dimensional stability and flame retardancy cannot be obtained, and when it exceeds 20% by mass, sufficient paper-making properties cannot be obtained and mechanical strength is insufficient. Become. By setting the content of the inorganic fibers in the base material for floor finishing material in the range of 3 to 17% by mass, it becomes easy to secure sufficient dimensional stability and flame retardancy, and papermaking properties and mechanical strength It becomes easier to ensure the above, and by setting it in the range of 4 to 15% by mass, it becomes easier to secure sufficient dimensional stability, flame retardancy, paper-making property and mechanical strength.

The base material for floor finishing material according to the present invention has water repellency. In order to impart water repellency to the base material for floor finishing material, water repellency treatment must be performed. The water repellent treatment is not particularly limited, and various wax-based water repellent agents such as natural wax, petroleum wax, chlorinated paraffin, and wax emulsion, higher fatty acid derivatives, synthetic resins, chromium complex salts, zirconium salts, silicone resins, etc. The water repellency-imparting agent may be internally added, impregnated or applied. The amount of the water repellency-imparting agent added is not particularly limited, but what is important is that the amount of the water repellency-imparting agent should be such that the base material for floor finishing material has sufficient water resistance.

Bending strength (according to JIS A-5905) obtained by measuring the fiber orientation direction of the floor finish base material according to the present invention and the direction perpendicular to the fiber orientation direction, and averaging the two.
Hereinafter the same) is 19 MPa or more, preferably 20 MPa
Or more, More preferably, it is 21 MPa or more. 19M
If it is less than Pa, sufficient scratch resistance cannot be secured. In addition, by setting the bending strength obtained by measuring the fiber orientation direction of the base material for floor finishing material and the direction perpendicular to the fiber orientation direction to be 20 MPa or more, sufficient scratch resistance is easily ensured, and 21 MPa is obtained. With the above, it becomes easier to secure sufficient scratch resistance.

The thickness of the base material for floor finishing material according to the present invention is 1
-4 mm, preferably 1.5-3.5 mm, more preferably 2-3 mm. If the thickness is less than 1 mm, sufficient mechanical strength cannot be ensured and it becomes difficult to perform actual processing. On the other hand, if it exceeds 4 mm, it becomes impossible to secure sufficient thinness and lightness. By setting the thickness of the base material for floor finishing material within the range of 1.5 to 3.5 mm, it is easy to secure sufficient mechanical strength and actual workability, and also secure sufficient thinness and lightness. Easy to do, 2
By setting the range to 3 mm, it becomes easier to secure sufficient mechanical strength, actual workability, and thinness / lightness.

The base material for floor finishing material according to the present invention may have a composition of endothermic decomposable inorganic compound / cellulosic fiber / inorganic fiber / thermosetting resin based on the above composition, and a method for producing the same. As, as a wet papermaking method, any method such as a dry molding method is applicable, and is not limited to a specific manufacturing method, in the following, in the case of applying the wet papermaking method, to the manufacturing method Further details will be given with reference to.

The base material for floor finishing material according to the present invention includes various retention aids for improving the retention of inorganic compounds having an endothermic decomposability, or synthetic dyes, pigments, etc. for coloring as necessary. May be included. Needless to say, a dry or wet paper strengthening agent, a sizing agent, a water resistant agent, etc. should be added depending on the application in order to improve the mechanical strength or the post-processability.

The method for incorporating the thermosetting resin into the base material for floor finishing material according to the present invention is to internally add a liquid material, a fibrous material or a granular material of the thermosetting resin to the raw material, It may be applied or impregnated after the paper layer is formed.

As a method of incorporating an endothermic decomposable inorganic compound, a method of coating or impregnating a base material with a coating material containing an endothermic decomposable inorganic compound may be considered, but a predetermined content is secured. In order to achieve uniform quality in the thickness direction, it is most preferable to internally add an endothermic decomposable inorganic compound to the raw material slurry in the form of powder or slurry. in this case,
The addition method and the order of addition of the endothermic decomposable inorganic compound, the cellulose fiber, the inorganic fiber and the thermosetting resin are arbitrary, and a beating treatment or the like may be performed as necessary.

In order to perform wet papermaking using the raw material slurry thus obtained, a usual papermaking method may be used. That is, the raw material slurry may be supplied onto a paper making net such as a Fourdrinier, a cylinder or an inclined net, filtered, dehydrated, and then squeezed and dried. Further, if necessary, two or more paper layers may be superposed by various combination nets, multi-row nets, various laminators, and the like.

For the hot-press forming, conventionally-used conventional hot-press press forming, preheating-cold press forming, high-frequency heat forming, etc. may be applied alone or in combination of two or more kinds. However, in the actual thermocompression molding, the flow-curing effect of the thermosetting resin contained is sufficiently exerted so that the bending strength of the obtained sheet-shaped thermocompression molding has a value within the range specified in the present invention. It is important to secure the hot-pressing conditions as described above.

The important point of the present invention is that the dimensional stability and the scratch resistance, which have hitherto been difficult to achieve both as the base material for floor finishing material and the floor finishing material using the base material, can be achieved at the same time. That is, a sheet-like thermocompression molded body containing an inorganic compound having endothermic decomposability as a main component and containing a small amount of cellulose fibers, inorganic fibers and a thermosetting resin has a predetermined bending strength and is subjected to a water repellent treatment. Good results were obtained by applying.

Regarding the dimensional stability, it is necessary to keep the content of the cellulose fibers, which causes the dimensional change, to a small amount, to contain a predetermined amount of inorganic fibers that can be expected to be effective for dimensional stabilization, and to apply a water repellent treatment. To achieve stabilization. However, in order to secure sufficient dimensional stability and also high flame retardancy, the content of the thermosetting resin must be small. Therefore, most of the constituent components of the base material for floor finishing material of the present invention are occupied by the endothermic decomposable inorganic compound, and the thermosetting resin and the cellulose fiber having a mechanical strength expressing action can be contained only in a small amount. Therefore, the mechanical strength of the base material for floor finishing material having such a configuration becomes considerably weaker than that of a plywood base material or an MDF base material.
From a common sense point of view, it is judged that the floor finish made of such a base material having weak mechanical strength is considerably weak in scratch resistance (caster durability).

However, surprisingly, a sheet-like thermocompression-molded base material containing a small amount of cellulose fibers, inorganic fibers and a thermosetting resin as a main component of an inorganic compound having an endothermic decomposability as a base material for a floor finishing material. Then, the bending strength of the plywood base material and the MDF base material is about 1 / 1.5 to 1/3, that is, the bending strength of the plywood base material and the MDF base material is about 50 to 60 MPa, while 19 MPa. Only by securing the above bending strength, the floor finishing material made of the base material is superior to the floor finishing material made of the plywood base material, and the scratch resistance (caster durability) equivalent to that of the floor finishing material made of the MDF base material is obtained. It was.

As described above, although the base material for floor finishing material of the present invention is weaker in mechanical strength than the plywood base material or the MDF base material, when it is used as a floor finishing material, the floor of the MDF base material is used. The details of the action / mechanism that achieves the same scratch resistance (caster durability) as the finishing material is unknown,
The content rate of each component is in the range specified in the present invention, and further,
By selecting the hot-pressing conditions under which the bending strength specified in the present invention is obtained, the inorganic compound having the endothermic decomposability that is the main component is a network structure of cellulose fibers and inorganic fibers with the flow hardening process of the thermosetting resin. It is considered that the specific scratch resistance is exhibited because the constituent components are solidly and densely integrated as a whole by being solidified in a form that strongly bonds to each other.

[0030]

EXAMPLES Next, the present invention will be described more specifically based on the following examples. The measurement of each item in this example was carried out by the following methods. (1) Thickness and density: According to JIS P-8118. (2) Bending strength: According to JIS A-5905. When the fiber orientation is present, the fiber orientation direction and the direction perpendicular to the fiber orientation direction were measured and the average of both was obtained. (3) Flame retardancy 1: JIS A-1321 surface test (1
The test was performed at 0 min) and the evaluation was performed based on the following evaluation criteria. ○: When the exhaust temperature curve does not exceed the standard temperature curve. Δ: Exhaust temperature curve exceeds the standard temperature curve, and the area surrounded by the exhaust temperature curve and the standard temperature curve is 100 ° C · mi
When not exceeding n. ×: The exhaust temperature curve exceeds the standard temperature curve, and the area surrounded by the exhaust temperature curve and the standard temperature curve is 100 ° C · mi.
When n is exceeded.

(4) Flame Retardancy 2: A surface test (10 min) of JIS A-1321 was conducted, and evaluation was carried out based on the following evaluation criteria. ◯: When the smoke generation coefficient does not exceed 60. Δ: When the smoke generation coefficient exceeds 60 and does not exceed 120. X: When the smoke generation coefficient exceeds 120. (5) Drying shrinkage ratio: A test piece of 100 mm square in which each side is parallel or perpendicular to the fiber orientation direction is 23 ° C.
After adjusting the humidity at 50% relative humidity and measuring the length of each side,
It is put in a hot air circulation dryer adjusted to 110 ° C. for 24 hours and then taken out, and the length of each side is measured. Shrinkage ratio of each side ((length before drying-length after drying) / length before drying) x
The shrinkage in the fiber orientation direction and the direction perpendicular to the fiber orientation direction was obtained by obtaining 100 (%), and the average of both was obtained. (6) Moisture-absorption elongation: A 100 mm square test piece was taken at 23 ° C. so that each side was parallel or perpendicular to the fiber orientation direction.
After adjusting the humidity at 50% relative humidity and measuring the length of each side,
After putting it in a thermo-hygrostat adjusted to 30 ° C. and a relative humidity of 90% for 24 hours, it is taken out and the length of each side is measured. The elongation of each side is calculated by ((length after moisture absorption-length before moisture absorption) / length before moisture absorption) × 100 (%), and the elongation percentage in the direction perpendicular to the fiber orientation direction. Was calculated, and the average of both was calculated.

(7) Water resistance: Two 100 mm square test pieces were used.
After adjusting the humidity at 3 ° C and relative humidity of 50% and measuring the mass,
It is taken out after being immersed in distilled water at 23 ° C. for 24 hours. next,
Quickly wipe off excess water attached to the surface with paper or cloth,
The mass is immediately measured, and the water absorption rate is determined by the water absorption rate (%) = ((mass after water absorption−mass before water absorption) / mass before water absorption) × 100.
I asked for. (8) Water absorption elongation: A 100 mm square test piece, which was taken so that each side was parallel or perpendicular to the fiber orientation direction, at 23 ° C.
After adjusting the humidity at 50% relative humidity and measuring the length of each side,
It is taken out after being immersed in distilled water at 23 ° C. for 24 hours. next,
Quickly wipe off excess water attached to the surface with paper or cloth,
Immediately measure the length of each side. Elongation of each side ((length after water absorption-length before water absorption) / length before water absorption) × 100
The elongation rate in the fiber orientation direction and the direction perpendicular to the fiber orientation direction was obtained by calculating (%), and the average of both was obtained. (9) Thermal conductivity: According to JIS R-2618. (10) Scratch resistance: diameter 50 mm, width 40 on the test piece
With a load of 200 N applied to a plastic caster of mm, a span of about 20 cm is about 7 m / min.
The test piece was tested by reciprocating at a speed of 1, and the number of times of reciprocation at which damage such as significant scratches or peeling occurred on the surface of the test body was measured. The evaluation was performed based on the following evaluation criteria. ○: 35,000 times or more △: 25,000 times or more and less than 35,000 times ×: Less than 25,000 times

Example 1 Commercially available softwood unbleached sulfate pulp and rockwool fiber having a fiber length of 3 mm were disintegrated with a pulper, and aluminum hydroxide powder (average particle size of 5.7 μm. The same applies hereinafter). , Calcium carbonate powder (having an average particle size of 1.5 μm, the same applies hereinafter) and powdered phenol resin (average particle size of 3)
It is 0 μm. The same shall apply hereinafter), a wax emulsion-type water repellent is further added, and the mixture is sufficiently dispersed and mixed, and then 16 sheet layers are laminated by a take-up paperboard machine having a fourdrinier / windup roll configuration to produce paper. After squeezing, drying,
Heat treatment with a hot press (temperature 175 ° C, pressure 3.0MP
a, time 6 minutes) to obtain a base material A for floor finishing. Regarding the base material A for floor finishing, the content of each component is shown in Table 1, and the thickness, density, flexural strength, flame retardancy 1, flame retardancy 2, dry shrinkage, hygroscopic elongation, water resistance, water absorption. The elongation rate and the thermal conductivity were measured, and the results are shown in Table 1. Next, apply 0.3 mm of melamine adhesive on both sides of the base material A for floor finishing.
A test piece was prepared by laminating and integrating thick wood veneer, and the scratch resistance of the test piece was measured. The results are shown in Table 1.

Example 2 A floor finishing base material B was obtained in the same manner as in Example 1 except that the calcium carbonate powder was not added.
Regarding the floor-finishing base material B, the content of each component is shown in Table 1, and the thickness, density, flexural strength, flame retardancy 1, flame retardancy 2, dry shrinkage, hygroscopic elongation, water resistance, water absorption The elongation rate and the thermal conductivity were measured, and the results are shown in Table 1.
Next, a test piece was obtained by laminating and integrating a wood veneer with a thickness of 0.3 mm with a melamine-based adhesive on both sides of the floor-finishing base material B, and the scratch resistance of the test piece was measured. Is shown in Table 1.

Example 3 A floor-finishing base material C was obtained in the same manner as in Example 1 except that the compounding amount of each component was changed. Regarding the floor-finishing base material C, the content of each component is shown in Table 1, and the thickness, density, flexural strength, flame retardancy 1, flame retardancy 2, dry shrinkage, hygroscopic elongation, water resistance, water absorption The elongation rate and the thermal conductivity were measured, and the results are shown in Table 1.
Next, a 0.3 mm thick wood veneer laminated with a melamine adhesive on both sides of the floor-finishing substrate C was used as a test body, and the test body was measured for scratch resistance, and the result was obtained. Is shown in Table 1.

Example 4 A floor-finishing substrate D was obtained in the same manner as in Example 1 except that glass wool having a fiber length of 3 mm was used instead of rock wool fiber having a fiber length of 3 mm. . Regarding the base material for floor finishing D, the content of each component is shown in Table 1, and the thickness, density, flexural strength, flame retardancy 1, flame retardancy 2, dry shrinkage, hygroscopic elongation, water resistance, water absorption. The elongation rate and the thermal conductivity were measured, and the results are shown in Table 1. Next, apply 0.3 mm of melamine adhesive on both sides of the floor finishing base material D.
A test piece was prepared by laminating and integrating thick wood veneer, and the scratch resistance of the test piece was measured. The results are shown in Table 1.

Example 5 A floor-finishing substrate E was obtained in the same manner as in Example 1 except that the compounding amounts of the respective components were changed. Regarding the base material E for floor finishing, the content of each component is shown in Table 1, and the thickness, density, flexural strength, flame retardancy 1, flame retardancy 2, dry shrinkage, hygroscopic elongation, water resistance, water absorption The elongation rate and the thermal conductivity were measured, and the results are shown in Table 1.
Next, a laminate obtained by laminating and integrating a wood veneer having a thickness of 0.3 mm with a melamine-based adhesive on both sides of the base material E for floor finishing was used as a test body, and the test body was measured for scratch resistance, and the result was obtained. Is shown in Table 1.

Comparative Example 1 A floor finishing base material F was obtained in the same manner as in Example 1 except that the compounding amounts of the respective components were changed. Regarding the base material F for floor finishing, the content of each component is shown in Table 1, and the thickness, density, flexural strength, flame retardancy 1, flame retardancy 2, dry shrinkage, hygroscopic elongation, water resistance, water absorption. The elongation rate and the thermal conductivity were measured, and the results are shown in Table 1.
Next, a 0.3 mm thick wood veneer laminated with both sides of the floor-finishing base material F with a melamine adhesive was used as a test body, and the test body was measured for scratch resistance. Is shown in Table 1.

Comparative Example 2 In Example 3, the heat treatment condition of the hot press was set to the temperature of 1.
A floor finishing base material G was obtained in the same manner as in Example 3 except that the temperature was 50 ° C., the pressure was 1.5 MPa, and the time was 6 minutes. Regarding the base material for floor finishing G, the content of each component is shown in Table 1, and the thickness, density, flexural strength, flame retardancy 1, flame retardancy 2, dry shrinkage, hygroscopic elongation, water resistance, water absorption. The elongation rate and the thermal conductivity were measured, and the results are shown in Table 1. Next, apply 0.3 mm of melamine adhesive on both sides of the base material G for floor finishing.
A test piece was prepared by laminating and integrating thick wood veneer, and the scratch resistance of the test piece was measured. The results are shown in Table 1.

Comparative Example 3 A floor-finishing substrate H was obtained in the same manner as in Example 1 except that the calcium carbonate powder was not added and the wax emulsion water repellent was not added. Regarding the base material H for floor finishing, the content of each component is shown in Table 1, and the thickness, density, bending strength, flame retardancy 1, flame retardancy 2, dry shrinkage, hygroscopic elongation, water resistance, water absorption. The elongation rate and the thermal conductivity were measured, and the results are shown in Table 1. Next, apply 0.3 mm of melamine adhesive to both sides of the floor finishing base material H.
A test piece was prepared by laminating and integrating thick wood veneer, and the scratch resistance of the test piece was measured. The results are shown in Table 1.

Comparative Example 4 For commercially available plywood, thickness, density, flexural strength, flame retardancy 1, flame retardancy 2, dry shrinkage, moisture absorption elongation, water resistance, water absorption elongation and thermal conductivity were measured. And the results are shown in Table 1.
It was shown to. Next, a test piece was obtained by laminating and integrating a wood veneer having a thickness of 0.3 mm with a melamine adhesive on both sides of the plywood to make a test piece, and the test piece was measured for scratch resistance, and the results are shown in Table 1. Indicated.

Comparative Example 5 For commercially available MDF, thickness, density, bending strength, flame retardancy 1, flame retardancy 2, dry shrinkage, moisture absorption elongation, water resistance, water absorption elongation and thermal conductivity were measured. And the results are shown in Table 1.
It was shown to. Next, a test piece was obtained by laminating and integrating a wood veneer with a thickness of 0.3 mm on both sides of the MDF with a melamine adhesive, and the test piece was measured for scratch resistance, and the results are shown in Table 1. Indicated.

[004]

[Table 1]

[0044]

EFFECTS OF THE INVENTION The base material for floor finishing material of the present invention is a sheet-like thermocompression molded product containing a predetermined amount of each component in the constitution of endothermic decomposable inorganic compound / cellulose fiber / inorganic fiber / thermosetting resin. Since it has a predetermined bending strength, is water repellent, and has a predetermined thickness, it has a scratch resistance equal to or higher than that of a floor finishing material made of an MDF base material and a floor finishing material made of a plywood base material. It is possible to realize a floor finishing material which has dimensional stability equivalent to or better than that, and which is also excellent in flame retardancy and thermal conductivity.

That is, regarding the floor finishing material with a plywood base material and the floor finishing material with an MDF base material that have been generally used as floor finishing materials, the floor finishing material with a plywood base material has a dimension against moisture or moisture absorption / release. Although it has relatively good stability, it has a drawback that it is inferior in scratch resistance and is susceptible to caster scratches, etc. On the other hand, a floor finishing material using an MDF base material has excellent scratch resistance and is unlikely to suffer caster scratches, etc. A floor that has both merits and demerits, such as poor dimensional stability against moisture absorption and desorption, and has the same or more scratch resistance as the floor finishing material made of MDF base material and the same or more dimensional stability as the floor finishing material made of plywood base material. There was no finishing material. Therefore, as a floor finishing material for floor heating that is subject to sudden drying and moisture absorption conditions, a floor finishing material with a plywood base material with good dimensional stability is often used.In this case, use a chair with casters. Since it cannot withstand such problems, the operational range was limited.

However, the base material for floor finishing material of the present invention is
As shown in Examples 1 to 4 above, when the content of the cellulose fibers is 2% by mass or more and 15% by mass or less, the dry shrinkage is about 1/3 to 1/4 of the MDF substrate, and the hygroscopic elongation. The ratio is about 1/3 of that of the MDF base material, and even when compared with the plywood base material, the dry shrinkage ratio is about 1/3 and the moisture absorption elongation ratio is about 1/2, which is excellent in dimensional stability. Further, the floor finish material of the present invention for floor finish material has the same scratch resistance as the floor finish material of MDF base material and has sufficient durability even when a chair with casters is used. Therefore, the floor finishing material using the base material for floor finishing material of the present invention can be suitably used for floor heating which is required to be subjected to rapid drying and moisture absorption conditions, and also in applications where chairs with casters are used. When the content of cellulose fibers in the base material for floor finishing material is more than 15% by mass and 17% by mass or less, the dimensional stability upon immersion in water is slightly lacking, but the dimensional stability and scratch resistance during drying and moisture absorption. Since flame retardancy, thermal conductivity and bending strength are all good,
For example, it can be used according to other purposes such as floor finishing materials excluding places around water and other applications.

Since the base material for floor finishing material of the present invention is treated to be water repellent, the content of cellulose fibers is 2% by mass or more and 15% by mass or less as shown in Examples 1 to 4 above. In some cases, the water absorption rate is extremely low even when immersed in water, and the water absorption dimension elongation rate is also small (compared to plywood base materials and MDF base materials, the water absorption rate is about 1/6 to 1/9, Approximately 1/2), and can be suitably used for parts requiring high water resistance such as a washroom, a bathroom, a changing room, and a kitchen.

Further, the base material for floor finishing material of the present invention is excellent in flame retardancy, so that even if an electric short circuit occurs, there is no fear of catching fire or burning, and for floor heating for which an electric heater is incorporated. It can be used safely even if it is installed on a heating element. Further, the flame retardancy of the base material for floor finishing material of the present invention is expressed by containing an inorganic compound having an endothermic decomposability as a main component and containing a predetermined amount of inorganic fiber, which is harmful to the human body. No flame retardants are used. Therefore, it can be safely used as a base material for floor finishing materials that are often touched by the skin.

In addition, since the floor finishing base material of the present invention has a thermal conductivity about three times that of the plywood base material and the MDF base material,
It has good heat transfer efficiency during floor heating and is advantageous in terms of energy saving.

Claims (7)

[Claims] 1. An endothermic decomposable inorganic compound in a solid content of 50 to 90% by mass, and a cellulose fiber in a solid content of 2 to 90% by mass.
17% by mass, and inorganic fibers in a solid content of 2 to 20% by mass,
A sheet-like thermocompression molded body containing a thermosetting resin in a solid content of 5 to 20% by mass, the bending strength obtained by measuring the fiber orientation direction and the direction perpendicular to the fiber orientation direction and averaging the two. JIS A-5905) is 19 MPa or more, is water repellent, and has a thickness of 1 to 4 mm. 2. The endothermic decomposing inorganic compound is at least one selected from hydrous inorganic compounds and carbonates.
The base material for floor finishing material according to claim 1, wherein the base material is made of a kind. 3. The hydrous inorganic compound comprises at least one selected from aluminum hydroxide, magnesium hydroxide, calcium hydroxide, gypsum dihydrate and calcium aluminide. The base material for a floor finishing material according to 2. 4. The base material for floor finishing material according to claim 1, 2 or 3, wherein the carbonate is calcium carbonate. 5. The thermosetting resin is a phenol resin,
3. At least one selected from a melamine resin, an epoxy resin, a urea resin, a urea melamine resin and an unsaturated polyester resin.
The base material for floor finishing material according to 3 or 4. 6. The inorganic fiber comprises at least one selected from rock wool fiber, glass fiber and ceramic fiber.
The base material for floor finishing material according to 4 or 5. 7. The sheet-shaped thermocompression-molded article comprises a laminate of two or more sheet layers.
The base material for floor finishing material according to 2, 3, 4, 5, or 6.