WO2018176886A1 - Process for fabricating geothermal floor substrate and substrate - Google Patents

Abstract

A process for fabricating a geothermal floor substrate, the procedure thereof comprising the follow steps: providing wood chips, screening same, washing same using water, steaming, performing hot grinding, applying an aldehyde-free adhesive and a waterproof agent, drying, applying an additive, shaping, pre-pressing, hot-pressing, cooling, and packing on the basis of grading. Further disclosed is a geothermal floor substrate fabricated by the process. Said process adjusts the process of applying an adhesive and adds alumina and carbon fiber powders to the fibers, thus the prepared floor substrate is free of formaldehyde, and has good water resistance, eliminating the problem of the floor releasing formaldehyde pollutant during use, improving problems like deformation occurring in use of the floor, increasing the heat conduction performance and dimensional stability of the geothermal floor substrate, and saving energy consumption.

Description

Manufacturing process and substrate of geothermal floor substrate Technical field

The invention belongs to the technical field of man-made fiberboard production, and relates to the manufacture of a floor substrate, in particular to a manufacturing process and a substrate of a geothermal floor substrate.

Background of the invention

With the acceleration of the aging process in China's society and the extreme weather caused by global climate anomalies, the difficult winters in the vast areas south of the Yangtze River have brought more trouble to consumers. The geothermal floor for home decoration will be the Chinese wood flooring industry. The trend of the times. Geothermal floor refers to the floor that is applied to the ground radiant heating system and transmits heat through the board facing the room. The types mainly include solid wood flooring and laminate flooring. At present, geothermal wood flooring generally has the disadvantages of less obvious heat sensitivity, slower temperature rise, slower temperature drop, etc., and in the production process, the base material used as the core board is mostly made of urea-formaldehyde resin bonded wood fiber, at high temperature. The amount of formaldehyde released will increase.

In order to improve the heating efficiency of the geothermal floor, when the solid wood floor is prepared or installed, aluminum sheets (or heat-conductive metal sheets such as copper sheets) are inserted into the side of the floor strip to improve the heat transfer efficiency. The operation is complicated, the installation efficiency is low, and the cost is high. In view of the above problems, it is one of the industry trends in the field of wood-based panels to develop a floor substrate that is aldehyde-free and environmentally friendly, and has a high thermal conductivity, that is, a relatively high temperature rise and a good heat preservation effect.

Summary of the invention

The object of the present invention is to develop a substrate manufacturing process for geothermal floor without aldehyde and high thermal conductivity, so that the geothermal floor can achieve a heating speed and a good heat preservation effect during use.

Technical solutions

The manufacturing process of the geothermal floor substrate, the production process is wood chip → screening → water washing → cooking → hot grinding → applying aldehyde-free adhesive and waterproofing agent → drying → applying additive → paving → pre-pressing → hot pressing → cooling → Separate packaging.

The step of applying the aldehyde-free adhesive and the water repellent according to the present invention is to add diphenylmethane diisocyanate (MDI) and water repellent emulsified paraffin to the fiber after separating the wood chips into elongated fibers by a hot mill. The amount of MDI added is 2.5 to 5% of the mass of the absolute fiber, and the amount of the emulsified paraffin is 1-2% of the mass of the absolute fiber.

In the additive application step of the present invention, the additive is a mixture of alumina and carbon fiber powder, wherein the alumina and the carbon fiber powder are ultrafine powders between 200 and 300 mesh; the addition amount of the alumina powder is relatively absolute. The dry fiber mass is 5 to 7%, and the carbon fiber powder is added in an amount of 0.5 to 1% based on the mass of the dry fiber; the additive is applied in the fiber air supply pipe.

In the present invention, the moisture content after drying of the fiber is 10 to 12% before the application of the additive.

In order to prevent diphenylmethane diisocyanate (MDI) from sticking to the hot press steel strip under high temperature conditions, the inner mold release agent may be directly mixed with the glue or the outer mold release agent may be sprayed on the surface of the steel strip and the fiber formed slab in the production. A separator is formed. The specific process content of the MDI application can be referred to the applicant's Chinese patent CN 2014104620728.

The geothermal floor substrate prepared according to the process of the present invention has an appearance similar to that of a common floor substrate, that is, a density board, which uses a formaldehyde-free resin in the manufacturing process and adds a heat conductive substance to make the geothermal The thermal conductivity of the floor substrate (using the heating rate as an indicator) and the dimensional stability are improved. It is an enhanced floor substrate that adapts to the times and has low carbon and environmental protection. It can realize the efficient, fast and economical secondary processing of geothermal floor. The amount of thermal conductive material added and the board The comprehensive cost and safety of the material are the key. By applying a certain amount of heat conductive material, the performance of the substrate is ensured, and the heating heating rate of the sheet is also improved.

The raw materials used in the present invention are all self-made or commercially available, and diphenylmethane diisocyanate (MDI) is purchased from Huntsman Chemical Co., Ltd.; carbon fiber powder is purchased from Zhangzhou Zhongli New Material Co., Ltd.

Beneficial effect

The geothermal floor substrate process disclosed by the invention adjusts the sizing process and adds alumina and carbon fiber powder to the fiber, and the prepared floor substrate does not contain formaldehyde, has good water resistance; and improves the geothermal floor substrate Thermal conductivity and dimensional stability. At the same time, it eliminates the hidden danger of formaldehyde pollution in the composite geothermal floor during use, improves the deformation, arching, shrinkage and other problems of the composite floor in geothermal use, and improves the thermal conductivity and thermal insulation of the geothermal floor. Save energy consumption.

detailed description

The present invention will be described in detail below with reference to the embodiments, so that those skilled in the art can understand the invention better, but the invention is not limited to the following embodiments.

Example 1

A manufacturing process of a 7mm geothermal floor substrate comprises the following steps:

1. Fiber preparation, after the self-cut wood chips or the purchased wood chips obtained by the screening are subjected to water washing treatment, and then subjected to retort treatment, and the cooked wood chips are subjected to hot grinding treatment to obtain desired fibers;

2. The glue is applied, and diphenylmethane diisocyanate (purchased from Huntsman) and emulsified paraffin are uniformly sprayed on the fiber, wherein the amount of diphenylmethane diisocyanate (MDI) is 4%. The amount of the molding agent added is 0.5%, and the amount of the emulsified paraffin added is 1%;

3. Drying, drying the fiber after sizing and waxing, and the moisture content of the dried fiber is 11-12%;

4. Applying an additive, in the fiber air supply pipe, uniformly spraying a mixture of the additive alumina powder and the carbon fiber powder into the dried fiber, wherein the alumina powder is added in an amount of 6% of the absolute dry fiber mass, the carbon fiber powder The amount added is 0.7% of the mass of the dry fiber;

5. Pre-pressing the pavement, the fiber after sorting is paved by a paving machine, and pre-pressing is performed by a pre-pressing machine;

6. Hot pressing, hot pressing at 220-170 °C, using 5-stage temperature zone, wherein the inlet section pressure is 280-320 N/m ² and the rebound section pressure is 170-230 N/m ² , core layer molding The grading section is gradually reduced to 70-90N/m ² , and the final fixed section pressure is 140-170N/m ² , and the press speed is 560-590mm/s;

7. Cooling and tempering, the substrate of the hot press is cooled and stacked separately, and the quenching and tempering time is 48h or more;

8. Sanding sawing, sawing and sanding to the required size and size;

9, grade and packaging.

Table 1 Performance indicators of the board

Performance	7mm geothermal floor substrate	7mm ordinary floor substrate
Density kg/m 3	840-860	850-870
Plate moisture content%	4.5-5.5	4-6
Internal bond strength MPa	1.5-1.9	≥1.2
Static bending strength MPa	48-52	≥35

Modulus of elasticity MPa	3400-3800	≥3000
24h water absorption thickness expansion rate%	7-8	≤11
Formaldehyde emission mg/100g	0.2-0.3	E1≤8
Dimensional stability (mm)	0.5	≤0.8
Heating substrate heating rate °C/h	10-12	5-5.5

Example 2

A manufacturing process of a 12mm geothermal floor substrate, comprising the following steps:

1. Fiber preparation, after the self-cut wood chips or the purchased wood chips obtained by the screening are subjected to water washing treatment, and then subjected to retort treatment, and the cooked wood chips are subjected to hot grinding treatment to obtain desired fibers;

2. The glue is applied, and diphenylmethane diisocyanate (purchased from Huntsman) and emulsified paraffin are uniformly sprayed on the fiber, wherein the amount of diphenylmethane diisocyanate (MDI) is 3.5%. The amount of the molding agent added is 0.5%, and the amount of the emulsified paraffin added is 1.5%;

3. Drying, drying the fiber after sizing and waxing, and the moisture content after drying is 10-11%;

4. Applying an additive, in the fiber air supply pipeline, uniformly spraying the additive carbon fiber powder and the alumina powder into the dried fiber, wherein the addition amount of the alumina powder is 7% of the mass of the dry fiber, and the addition of the carbon fiber powder The amount is 1% of the mass of the dry fiber;

5. Pre-pressing the pavement, the fiber after sorting is paved by a paving machine, and pre-pressing is performed by a pre-pressing machine;

6, hot pressing, hot pressing at 235 ~ 180 °C temperature, using 5 sections of temperature zone, wherein the inlet section pressure is 300 ~ 350N / m ² , the rebound section pressure is 190 ~ 240N / m ² , core layer plastic The grading section is gradually reduced to 80-100 N/m ² , and the final constant section pressure is 150-180 N/m ² , and the press speed is 350-380 mm/s;

7. Cooling and tempering: the substrate of the hot press is cooled and stacked separately, and the quenching and tempering time is 48h or more;

8. Sanding sawing: After sanding, sawing to the required size plate;

9, grade and packaging.

Table 2 Performance indicators of the board

Performance	12mm geothermal floor substrate	12mm ordinary floor substrate
Density kg/m 3	820-840	820-850
Plate moisture content%	4.5-5.5	4-6
Internal bond strength MPa	1.4-1.8	≥1.2
Static bending strength MPa	40-45	≥32
Modulus of elasticity MPa	3200-3500	≥3000
24h water absorption thickness expansion rate%	6-7	≤9
Formaldehyde emission mg/100g	0.2-0.3	E1≤8
Dimensional stability (mm)	0.5	≤0.8
Heating substrate heating rate °C/h	8-11	4-5

The above is only the embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by the specification of the present invention, or directly or indirectly applied to other related technical fields, is the same. The scope of the invention is included in the scope of the patent protection of the present invention.

Claims (6)

1. The invention relates to a manufacturing process of a geothermal floor substrate, which is characterized in that the production process is wood chip→screening→water washing→cooking→hot grinding→application of aldehyde-free adhesive and waterproofing agent→drying→application additive→paving→pre-press→heating Press → cool → sub-package.
2. The manufacturing process of the geothermal floor substrate according to claim 1, wherein the step of applying the aldehyde-free adhesive and the water repellent is performed by separating the wood chips into elongated fibers by a hot mill, and adding the fibers to the fibers. Diphenylmethane diisocyanate, and water repellent emulsified paraffin, wherein the amount of diphenylmethane diisocyanate added is 2.5 to 5% by mass of the absolute dry fiber, and the amount of emulsified paraffin added is 1-2% by mass of the absolute fiber.
3. The manufacturing process of the geothermal floor substrate according to claim 1, wherein the additive is a mixture of alumina and carbon fiber powder, wherein the alumina and the carbon fiber powder are ultrafine powders in the range of 200 to 300 mesh. The amount of the alumina powder added is 5 to 7% based on the mass of the absolute fiber, and the amount of the carbon fiber powder is 0.5 to 1% based on the mass of the absolute fiber.
4. A process for producing a geothermal floor substrate according to claim 1, wherein said additive is applied in a fiber air supply duct.
5. The process for producing a geothermal floor substrate according to claim 1, wherein the moisture content of the fiber after drying is 10 to 12% before the application of the additive.
6. A geothermal floor substrate produced by the manufacturing process of any of claims 1-5.