KR100214379B1 - Method for making artificial board - Google Patents

Abstract

The present invention collects rice straw, barley straw, straw, etc., which are discarded after harvesting in rural areas, first boils in boiling water, and spreads the material evenly and weaves together with a bale or a mat to soluble melamine resin (Melamin Resin), which is a thermosetting resin. After spraying resin or acrylic amalon etc. in the amount of 30g / m2, the water content is dried to 13% or less with a dryer to enable plate production, and then cut to the dimensions of the product to be produced, and a high temperature of about 138 ℃ ± 5 Compressed, molded and processed by high pressure press of 12 ~ 15kg / cm2 dml and rapidly cooled by cold press to cut the product size by circular cutting saw to prevent warping phenomenon during cooling. In addition, the sound absorbing and soundproofing effect, as well as the heat storage effect of the thermal insulation and the beautiful appearance of the building interior materials can be provided to provide a plywood.

Description

Manufacturing method of artificial plywood of new natural material which processed straw

The present invention is made from rice straw, barley straw, straw left after harvesting in rural areas, boil this material, extract only the fiber and weave it by spraying urea resin or water-soluble melamine resin (Melamin Resin) which is a water-soluble thermosetting resin and then dried The present invention relates to a method for manufacturing artificial plywood of a natural new material processed by straw, which is invented so as to produce a plaster plywood which is a natural new material for building by rapidly cooling after pressing and molding.

Conventionally, the plasterboard for building is mainly made of plywood, panels made of gypsum, concrete, etc., but this is made of limited wood or buried resources, so it is necessary to have a small amount of resources like our country. It is obvious that the demand cannot be met. The only way to meet the supply of demand is to import from foreign resource countries, but the recent global trade market is not only the Basel Convention, but also the Rio Environmental Conference and the World Trade Organization. The oil market and the food market are typically weaponizing resources as the export ban on the pollution industry and the weaponization of resources. In addition, even if the resources used are in danger of being depleted within a few decades, products produced using resources such as petroleum should develop materials that can replace them, and produce new products even if alternative materials are developed. It is pointed out that the future problem to learn the manufacturing application technology that can produce a product with a problem.

The present invention was invented in view of the above-mentioned problems, using only straw, barley straw, straw, etc. among the wastes generated in rural areas, and then extracting only fiber to spread the material evenly or flatly to form a certain thickness or bale. Or weave and weave like a mat, and then spray with a water-soluble thermosetting resin, urea resin or melamine resin (Melamin Resin) as a binder, and then dried so that the moisture content is 13% or less and press-molded in a press of high temperature and high pressure Next, it was invented to produce a plastering plywood, a natural new material for construction by rapid cooling, to produce a plastering product with excellent heat resistance and cold resistance as well as sound insulation and sound absorption.

Hereinafter, an embodiment of the present invention will be described in detail.

After collecting rice straw, barley straw, and straw from farming crops in rural areas, boil them in boiling water to equalize the quality of the fiber (if necessary, put the material in a cotton mask and burn it like cotton). The material is squeezed and squeezed to a finished material, which is sprayed with water-soluble emaljon resin (Emaljon Resin) or melamine resin (Melamin Resin) in units of 30 g / m, or the surface is treated with powder.

The resin-coated material must be dried so that the moisture content is less than 13% to prevent defects during molding. During drying, the input temperature and the withdrawal temperature are constant at about 120 ℃ but the drying temperature is 150 ℃. Should be high enough

As described above, the dried material is cut according to the specifications of the produced product, and the cut material is compressed and molded in a high temperature and high pressure press (Hot Press).

The molding temperature should be 138 ℃ ± 5, the temperature deviation should not exceed 10 degrees, the pressure is pressed within 12 ~ 15kg / cm2, the product press time is different depending on the type and thickness of the product produced But usually within 5 to 10 minutes.

At this time, when high elasticity is required due to the characteristics of the product, glass fiber or wire mesh is put into the product, and then compressed and molded by a press.

In this way, the thermal pressure, the finished product is made of rapid cooling in a pressurized state because the tensile properties of the fibers are different.

If it is cooled without pressurization, 100% deformation occurs.

After the cooling is completed, the product is cut, processed according to a predetermined standard, and finished after inspection.

The present invention made as described above is an application technique, and in the case of a processed plasterboard such as an uneven plate for special use or embossing, a product required by using a mold at the time of thermocompression molding may be molded.

The present invention made as described above will be described as follows, using a rice straw, barley straw, straw, etc. as a comparative example and an example of the production process of plastering plywood.

The following comparative examples list the points generated during the fabrication process assuming various temperatures during the present invention study as a comparative example.

Comparative Example 1

Boil the straw in boiling water over 100 ℃ for more than 30 minutes to make the color of fiber evenly, and then spread the material evenly and weave it like a weave like a bale or a mat.The water-soluble emalzone (chilly polymer TX 404) is added to water and 1: After diluting to 1 and mixing with a stirrer, it is sprayed in an amount of 30 g / m 2, and then compression molded at a pressure of 10 kg / cm 2 for 5 minutes at a temperature of 120 ° C. with a hot press, and then subjected to the tensile force of the vegetable extract fiber product. In order to prevent the warpage of the product according to the pressure of the molded product to 7kg / cm2 state was completed the product.

The product is uneven between the aggregate component of the straw and the resin caused unevenness and wave pattern on the surface of more than 80% unevenness, the binding force is reduced, there was a peeling phenomenon.

At this time, the state of the material was checked and the temperature was raised to 150 degrees, and the surface of the natural fiber was burned together to form a wave pattern.

Comparative Example 2

Evenly boiled rice straw and dip it into 6mm thick matting test, dilute the water-soluble thermosetting resin melamine resin 1: 1 with water, spray it at 500g / m2 with 37.5% solids, and heat it to a temperature of 100 ℃ Molding for 5 minutes at a pressure of / cm2.

At this time, a pattern occurs on a part of the surface of the product, and tends to float slightly, but the cut cross section is relatively good, and thus, the value of the product was soft.

Comparative Example 3

Rice straw boiled in boiling water was woven into a thickness of 8 mm like a bale, mixed with a product of water-soluble melamine resin, heated to a temperature of 100 ° C., and molded at a pressure of 12 kg / cm 2 for 5 minutes.

The surface of the molded article was better than Comparative Example 2, but there was a variation in thickness, peeling and pores were formed due to the relationship between the insect repellent of the air inside the product and the moisture in the surface and the product.

[Comparative Example 4]

After mixing rice straw cutting and synthetic resin cutting in a 1: 1 ratio, spray water-soluble melamine resin and dry it for about 15 minutes in a dryer at 140 ℃ to reduce moisture content, and make water content 12%, then 120% temperature. Molded for 5 minutes at a pressure of 12kg / cm2.

At this time, the surface state of the molded product had a wave pattern and curvature of the wave form, the product thickness deviation and peeling occurred.

As a result, rice straw cutting and synthetic resin cutting are difficult to dry, they are not absorbed well, they need to contain a lot of resin, and the product condition is difficult to add product value. did.

[Comparative Example 5]

Boiled rice straw was woven into 8mm thickness, and instead of water-soluble melamine resin, water-soluble acrylic resin was applied in an amount of 50g / m2, dried in a dryer to adjust the water content to 13% or less, and then dried at a temperature of 120 ° C for 5 minutes at a pressure of 12kg / cm2. Molded.

At this time, the surface of the molded article was good, but weak in impact.

Comparative Example 6

Boiled rice straw was woven into a thickness of 8mm and sprayed with phenolic resin. Afterwards, the surface condition and product inside were not abnormal at 120 ℃, but the odor occurred badly during operation and the surface became yellow.

When explaining the embodiment of the present invention with reference to the comparative example as described above are as follows.

Example 1

After stirring 1 kg of rice straw cutting powder and 500g of water-soluble melamine resin in a mixer, the binder is evenly absorbed by rice straw cutting powder, and dried in a drier so that the moisture content is less than 13%. ± 5, pressure 12-15kg / cm2, pressurization time was compression-molded for 5 minutes, and cooled in a pressurized state in a thermopress press to make a new material plate finished product.

The product had a good surface condition or strength but a thickness variation occurred in the product.

Example 2

Weave rice straw with a thickness of 8mm and apply water-soluble melamine resin on both sides with sprayer at 30g / m2 unit, adjust the water content to 13% or less in the dryer, and set the temperature to 138 ℃ ± 5 in hot press. It was set to 12 to 15kg / cm 2 and then the initial air was discharged and molded for 5 minutes.

The finished product was rapidly cooled in a cold press for about 10 minutes to produce the finished sheet.

The product does not require a mold, and the thickness of the product as well as the product condition was very good.

Example 3

Weave rice straw with a thickness of 8mm and spray 30g / m2 of powder phenolic resin (Phenol Resin) to mix the powder well, and after cutting into a panel form, the pressure is 12-15kg / cm2 in a heated hot press of 138 ℃ ± 5. Air was released at the beginning of dosing and compression molded for 5 minutes.

The finished product was rapidly cooled in a cold press for about 10 minutes to produce the finished sheet.

At this time, the surface state, strength, and product state on the product were good.

Example 4

In order to increase the strength of the product and the adhesion of wallpaper construction, weave rice straw with 8mm thickness and attach cotton cloth (small window) on both sides, and apply water-soluble melamine resin in the amount of 30g / m2, and adjust the moisture content to 13% or less. Thereafter, the molding temperature was adjusted to 138 ° C. ± 5 and the unit pressure was adjusted to 12 to 15 kg / cm 2, followed by releasing initial air and molding for about 5 minutes.

The finished product was rapidly cooled in a cold press for about 10 minutes to produce the finished sheet.

At this time, the product was particularly excellent in product strength.

Example 5

Weave rice straw with a thickness of 8 mm, apply water-soluble melamine resin on both sides in an amount of 30 g / m2, dry it to a water content of 13% or less, and insert a wire mesh between the bolts to form a molding temperature of 138 ° C ± 5 After adjusting the unit pressure of the product to 12-15 kg / cm < 2 >, the air was discharged twice at the beginning of the feeding and thermo-molded for 5 minutes.

The molded product was rapidly cooled in a cooling press for about 10 minutes to form a finished plate.

The product was particularly excellent in durability and tensile strength.

As shown in Comparative Examples and Examples as described above, when the rice straw is burned, the binding strength with the resin is lowered, the thickness variation of the product cannot be adjusted, and the cutting material is not suitable due to the long curing time of the fiber. , Rice straw was woven into a plate. When thermosetting resin is used as a binder, water must be evaporated to have a water content of 13% or less, and during molding, the air discharge device must It was found that mass production of a good product without binding force and surface bubble generation was possible only when pumping was performed. The water-soluble melamine resin was the best among thermosetting resins as a binder.

Briefly summarized the manufacturing process according to an embodiment of the present invention made as described above is as follows.

After boiling rice straw in boiling water → weaving (weave together with bales or mats) → needles to spread evenly → spraying thermosetting resins → drying (less than 13% of water content) → compression, molding (pressurized by hot press) → rapid It is possible to manufacture a building interior material which consists of the process of cooling (cooling in a press-pressed state) → cutting according to the specification of the product → inspection → finished product.

In addition, the present invention attaches small windows or cotton cloth to both sides of the straw straw woven in order to increase the strength of the product and wallpaper construction, and then sprayed with melamine resin, dried and then compressed to produce plywood to easily attach and fix during installation You can do it.

The present invention made as described above does not have the appearance of bending of the outer surface than the existing wood laminate, there is no disadvantage of bending, and also excellent durability and processability, and the thermosetting resin of the straw and the binder as the main raw material in the manufacturing process and high pressure and By pressure welding at high temperature, the thermosetting resin improves the surface condition of the product and is a solvent-resistant product that is resistant to abrasion, acid and alkali resistance, and straw, straw, etc., forms fibers and hundreds of millions of pores inside, making it waterproof, cold-resistant, and processable. It is not only high in sound insulation and heat resistance but also excellent in texture and color, and can be used as various plastering panels for interior as needed.

Claims (2)

Boiled rice straw is woven together with bales or mats, and then evenly coated with water-soluble melamine resin (Melamin Resin) as a binder in an amount of 30 g / m2, dried to have a water content of 13% or less, and then dried material for each use. Cut to the specified dimensions and put into a thermocompress press with a working temperature of 138 ℃ ± 5, and after the initial air is discharged, the unit pressure of the product is 12-15kg / cm2, compressed and molded for about 5-10 minutes, and this is again the cold press. Method of producing artificial plywood of natural new material processed straw, characterized in that the process is processed to produce a finished product by processing and inspection to cut the dimensions of the product (Diamond Tip Saw) by rapid cooling. The method according to claim 1, wherein in order to increase the strength of the bonding plate and the adhesion during wallpaper construction, the cotton cloth is attached to both sides of the weave straw, sprayed with a thermosetting resin melamine resin and dried to a water content of 13% or less, and then used temperature 138. A method for manufacturing artificial plywood of natural new materials processed with straw, which is compressed and processed by a hot press of ° C ± 5.