KR20130052880A - The high-glossy synthetic resin sheet manufacture method - Google Patents

Abstract

PURPOSE: A manufacturing method of a high glossy synthetic resin sheet is provided to manufacture the high glossy synthetic resin sheet without painting processes. CONSTITUTION: A manufacturing method of a high glossy synthetic resin sheet comprises a step of mixing urethane, isocyanate, or unsaturated polyester-based resin with a phenol melamine copolymer resin or a urea resin; a step of mixing a dispersing agent and releasing agent with the mixture; a step of impregnating raw paper into the mixture; a step of drying the raw paper; a step of impregnating the dried raw paper into the mixed resin which is mixed of nanosilver, methyl ethyl ketone, titanium oxide(TiO), and a hardener; a step of drying the impregnated raw paper; and a step of cooling the raw paper to room temperature.

Description

The high-glossy synthetic resin sheet manufacture method

The present invention relates to a method for manufacturing a synthetic resin sheet for high gloss, the production of high-gloss synthetic resin sheet by UV high brightness coating on the existing low pressure mela-mine impregnated paper (HPM) sheet or high pressure melamine sheet (HPM) sheet The present invention relates to a method for producing a synthetic resin sheet for high glossiness to have an effect of increasing production, reducing cost, and improving reliability of quality.

In general, a low pressure mela-mine impregnated paper (LPM) or HPM (high pressure melamine sheet) is used for manufacturing a plate material for use in wooden furniture, such as general furniture, tables, musical instruments, or floorboards for durability. After the sheet is put on, it is pressed and processed.

In general, the plate-like material manufacturing process using LPM sheet undergoes a series of processes in which raw paper is first impregnated in urea resin and dried, then coated with phenol melamine co-condensation resin, dried again, and then cooled and cut. 50kgf in a multi daylight press by obtaining a sheet material and impregnating and laminating thermosetting resin melamine and phenolic resin on a paper or fibrous substrate printed with natural and artificial patterns on one side when using an HPM sheet. It is possible to obtain a plate material that is formed by compression molding under a thermal pressure of / cm 2 or more.

However, when UV coating is performed on the surface layer of the plate material manufactured by such a known manufacturing method, the coating process such as undercoat, midway, and topcoat is required. It is well known that the situation is emerging as a continuous solution in the industry.

In order to solve this problem, in the case of the conventional LPM synthetic resin production to adhere to the surface of the plate material for durability, formalin (61.6wt%), melamine (33.3wt%), distilled water (3.8%) in the reactor at room temperature After the addition of TEA (1.3wt%) into the reaction catalyst, the pH was adjusted to 8.3 to 8.5 and heated to 95 ℃, the reaction proceeds to reach 95 ℃ and 25 ℃ in the mass cylinder after 3 to 4 hours Distilled water and LPM resin (Low Press Melamine resin) is mixed at 4: 1 when white turbidity is cooled to room temperature. When the temperature reaches 70 ° C during cooling, urea (12 wt%) and TEA (2.5 wt%) are added, DEG (diethylene glycol) (2.4 wt%) and methanol (3.0 wt%) are added at room temperature and sodium hydroxide is added. (0.8-1.9 wt%) to pH 9.0-9.2 to complete. The LPM resin (Low Press Melamine resin) prepared as described above is impregnated with a base paper after mixing 03 to 0.5 wt% of a curing agent, 0.4 to 0.8% of a releasing agent, and 0.5 to 1.0 wt% of a dispersant.

When the plate material is obtained by using the impregnated paper of the conventional LPM resin (Low Press Melamine resin), the adhesion to the plate material is good due to the characteristics of the LPM resin, but it is difficult to further coat the upper surface of the LPM sheet, thus coating UV coating. It is pointed out that a problem is that a complicated process of inducing adhesion by sequentially processing undercoat, midway, and topcoat work on most surface layers or veneers has been pointed out.

In addition, in processing the surface of the LPM paper (sheet), not only can not be painted with a paint or paint for wood, but also contains a problem that a lot of defective rate occurs because the coating is not 100%.

On the other hand, in the out-lay and In-Lay painting work, which is the pasting work of solid wood or veneer, the veneer uses various objects using a method of weaving while maximizing natural saving. In the case of the mosaic method, the cost of the mosaic is increased due to the high limits and loss ratios of various color expressions, and the supply of the same material is difficult, and expensive equipment (laser) has to be purchased. In addition, some of the conventional LPM sheet used to replace the veneer, but when produced by the inlay and inlay method, there is a problem due to the poor adhesion due to the adhesion of the sheet and the sheet and unstable surface coating after sheet molding.

Further, in addition to obtaining a plate material by using a synthetic resin sheet made of LPM resin, it is possible to obtain a plate material by using an HPM resin, which requires a separate adhesive treatment process due to the characteristics of the HPM resin, In addition, it is difficult to overcome the instability of the surface coating, as well as complicated in the manufacturing process, such as the addition of the surface coating process by the top coat.

Therefore, it is well known that a sheet having a high gloss surface and having a high scratch resistance is quite difficult, and many trials and errors have been made in the current industry even in its attempt.

On the other hand, unlike the methods described above, one of the methods for imparting high glossy and colorful aesthetics to the surface of furniture, polished materials such as pearl, metallic, hologram, or polyester film There is a method of directly attaching a paper containing an adhesive with an adhesive and coating the polyester resin thereon or a method of spraying the powdered varnish directly to the polyester paint paint.

However, this method has a problem that the resin layer is easily peeled off from the surface of the plate material by the gloss material having a particle form, or the surface is damaged even by a small scratch. In the latter, the effect of the gloss material is a colored paint. As a result of dilution, the problem of mixing a large amount of varnish has been raised, and in such a case, the color of the paint is discolored, and the problem of cost increase due to the use of a large amount of varnish is pointed out. There is a problem in that the overall work process is complicated, such as to be formed.

Therefore, in each of the high gloss application methods to the plate surface layer described above, the problem of peeling off when using LPM sheet or HPM sheet and the like, and the color fading and complexity of the process when using powdered varnish directly on the plate surface The problems of each method have been derived, and there are many difficulties in manufacturing a synthetic resin sheet having a high gloss (aka Hi glossy) and a plate material using the same while using an LPM sheet and an HPM sheet.

In order to solve such a problem, the present inventors provide a synthetic resin sheet through a manufacturing method according to "Korean multi-functional synthetic resin sheet manufacturing method and multi-functional synthetic resin sheet" No. 2005-128954, but expects a satisfactory high gloss effect There is a difficult problem to do.

Patent Application No. 2005-128954 "Manufacturing method of multifunctional synthetic resin sheet and multifunctional synthetic resin sheet"

Accordingly, the inventors of the present invention have devised the present invention in consideration of the various problems described above, by applying a UV (Ultra Violet-ultraviolet ray blocking) coating to an existing low pressure mela-mine impregnated paper (LPM) sheet or HPM sheet. It is possible to manufacture high gloss LPM sheet or high gloss HPM sheet with high gloss, which is produced without complicated painting process such as high, medium, and high, by manufacturing high gloss synthetic resin sheet for UV high gloss coating. The purpose is.

In addition, the present invention, when obtaining a plate-like material using the high-gloss LPM sheet and HPM sheet, preventing the peeling phenomenon between the plate-like material and the synthetic resin sheet, such as each high-gloss LPM and HPM, and durability, water resistance of the surface layer of the synthetic resin sheet It is an object of the present invention to provide a method of manufacturing a synthetic resin sheet for high glossiness to improve, increase adhesion to a plate material, high gloss effect, and improve productivity, reduce cost, and improve reliability of product quality.

5 parts by weight of urethane, 5 parts by weight of isocyanate or 10 parts by weight of unsaturated polyester resin, which is a polycondensation resin of acid and alcohol, by mixing at least one selected from urea resin or phenol melamine copolymer resin, In urea resin,

20 parts by weight of Dispersing Agen and 5 parts by weight of a release agent are added and mixed based on the phenol melamine cocondensation resin to be first impregnated in the first impregnation tank.

After the primary drying by infrared lamp or dry zone, the base paper obtained through the first impregnation process to the phenol melamine copolymer resin,

100 parts by weight of phenol melamine cocondensation resin, 5 parts by weight of silver nanoparticles having a concentration of 1000 ppm and a weakly acidic average particle of 5-20 nm (nanometer), 5 parts by weight of methyl ethyl ketone (MEK) After the first impregnation in the secondary impregnation tank containing 70 parts by weight of titanium oxide (TiO) and 0.8 parts by weight of the curing agent is mixed in the secondary impregnating tank to receive the mixed resin, and then dried in the dry state,

Provided is a method for producing a synthetic resin sheet for high gloss, which is secondly impregnated and then secondarily dried with warm air and cooled to room temperature.

According to the present invention, by providing a synthetic resin sheet bonded to the surface of the plywood panel by heat pressing to be applied to various furniture materials, floor panels, etc., the surface layer can be expected a high gloss effect, and also high gloss high gloss as before It is possible to produce high gloss synthetic resin sheet by sequential impregnation process by avoiding the very complicated work process such as painting process to have the effect, so that the work process can be remarkably shortened, resulting in increased production, cost reduction and quality. The improvement of the reliability can be expected.

In addition, the present invention can be expected to produce an excellent plate-like material having a high gloss effect and excellent adhesion state and scratch resistance on the surface by using the HPM, LPM sheet and the like.

The present invention is at least one selected from 5 parts by weight of urethane, 5 parts by weight of isocyanate or 10 parts by weight of unsaturated polyester resin which is a polycondensation resin of alcohol and alcohol, relative to the weight part of resin selected from urea resin or phenol melamine copolymer resin. By mixing impregnated the primary paper in the urea resin, and firstly dried by an infrared lamp or dry zone, and then the secondary paper impregnated in the phenol melamine copolymer resin through the first impregnation process, the warm air It is to provide a method for producing a synthetic resin sheet for high gloss by secondary drying with heat and cooling to room temperature.

Hereinafter, the present invention will be described by way of preferred embodiments of the above-described steps.

 - 1st Example  -

The process of obtaining the synthetic resin sheet according to the first embodiment of the present invention is an improvement of the "multifunctional synthetic resin sheet manufacturing method and synthetic resin sheet" of Korean Patent No. 2005-128954 filed by the applicant.

First, the present process according to an embodiment for obtaining a synthetic resin sheet, a process for manufacturing a synthetic resin sheet for high gloss for bonding to the surface layer of the plate-like material,

A primary compounding and impregnation process of impregnating a raw paper with 60 mesh rolls in a primary impregnation tank, in which 20 parts by weight of a dispersant and 5 parts by weight of a release agent are mixed with respect to 100 parts by weight of a phenol melamine cocondensation resin;

5 parts by weight of silver nano, 5 parts by weight of methyl ethyl ketone (MEK), and 5 parts by weight of oxide having a concentration of 1000 ppm and 100 parts by weight of phenol melamine cocondensation resin. Secondary compounding and impregnation for impregnating the primary impregnated base paper using 60 mesh rolls in the secondary impregnation tank in which the secondary impregnation tank is mixed with 70 parts by weight of titanium (TiO) and 0.8 parts by weight of a curing agent. Fair,

A tertiary blending and impregnation process of impregnating with 40 mesh rolls in a tertiary impregnation tank comprising 5 parts by weight of an anti-cracking additive, 0.8 parts by weight of a curing agent, and 0.7 parts by weight of a release agent, based on 100 parts by weight of a phenol melamine cocondensation resin;

Quaternary formulation and impregnation process using impregnated 40 resin resin pad in a 4th impregnation tank, which is mixed with 5 parts by weight of crack prevention additive, 1.0 part by weight of curing agent, and 5 parts by weight of release agent, based on 100 parts by weight of phenol melamine cocondensation resin. Fair,

After each impregnation process between the first to fourth blending and impregnation process, the synthetic resin sheet can be obtained by a drying process to maintain 130 ℃ and to dry through a drying line having a feed rate of 40 m / min.

Primary formulation and Impregnation  fair

This process is to impregnate the first base paper, and 20 parts by weight of dispersing agent and 5 parts by weight of a release agent are added and mixed based on the phenol melamine cocondensation resin to be contained in the primary impregnation tank.

The primary impregnation tank is provided with a roll consisting of a surface of 60 mesh, and the first base paper flows while being wound by the roll while passing through the mixed resin in the primary impregnation tank. Allow the primary mixed resin to be sufficiently impregnated in the base paper.

This process is to enhance the adhesion between the original paper and the ink layer.

Secondary formulation and Impregnation  fair

This step is a step for allowing the impregnated paper to be impregnated through the primary impregnation tank in the first step so as to be impregnated secondly through the mixed resin solution.

In the present invention, the process of drying the base paper in the impregnated state through the drying unit for drying the base paper through each process as shown in the accompanying drawings when the process of the present invention to be made sequentially.

As shown in the drawing, the initial paper is wound after the first impregnation tank is impregnated in the primary impregnating tank and wound by rollers spaced at equal intervals in a drying part maintaining a temperature of about 130 ° C. The process is repeated.

On the other hand, the feed speed of the paper is maintained at a speed of 40 m / min so that the feed speed, the feed speed in the drying unit is also the same.

As described above, the resin administered to the secondary impregnation tank has a concentration of 1000 ppm relative to 100 parts by weight of the phenol melamine cocondensation resin and has an average particle size of 5 to 20 nm (nanometer). 5 parts by weight of silver nano silver,

5 parts by weight of methyl ethyl ketone (MEK) used as a lacquer, resin solvent, etc., as a technically important ketone;

It means a photocatalyst, which is completely harmless to the human body and is water soluble, so that the application range can be widely applied, and once applied, it is mixed with 70 parts by weight of titanium oxide (TiO) and 0.8 parts by weight of a curing agent. To accommodate the mixed resin, the second impregnating tank is provided with 60 mesh rolls to impregnate the first impregnated raw paper after the first compounding and impregnation process, and the first impregnated and dried through a drying unit Secondary impregnation of the base of the state.

In order to induce the effect of titanium oxide and the effect of silver nano added as described above, the concentration of silver nano was 1,000 ppm, 70 parts by weight of the titanium oxide compared to 100 parts by weight of the phenol melamine cocondensation resin was mixed as described above. The antimicrobial activity of silver nano and the oxidation power of titanium oxide were used to obtain the purification effect of contaminants.

In this way, the secondary paper is impregnated in the tertiary impregnation tank, which is introduced into the drying unit again, dried under the same drying conditions, and described later.

Tertiary formulation and Impregnation  fair

This process is to allow the base paper, which is dried in the drying unit after the second process and then rolled and conveyed, is impregnated in the third impregnation tank in order to exert the adhesive force between the wood panel and the synthetic resin sheet required in a separate process.

The mixed resin accommodated in the tertiary impregnation tank is a mixed resin formed by mixing 5 parts by weight of an anti-cracking additive, 0.8 parts by weight of a curing agent, and 0.7 parts by weight of a release agent, relative to 100 parts by weight of the phenol melamine cocondensation resin. Impregnation is performed using 40 mesh rolls.

4th formulation and Impregnation  fair

After the third step, the step is allowed to dry in the drying unit proceeds at a temperature of 130 ℃, 40m / min at the same conditions after the third step, and then impart an adhesive functional group to the surface layer of the synthetic resin sheet impregnated through the third step Of course, it is an impregnation process for obtaining an LPM sheet for UV-glossy.

In order to obtain the LPM sheet for UV high-gloss (Hi-glossy), it is impregnated with the resin to be compounded again. At least one selected from 5 parts by weight of an additive for prevention, 1.0 parts by weight of a curing agent and 5 parts by weight of a release agent, and 5 parts by weight of urethane, 5 parts by weight of isocyanate, and 10 parts by weight of an unsaturated polyester resin which is a polycondensation resin of an alcohol and an alcohol. Will be mixed.

The urethane (urethane) has excellent mechanical strength and good workability, such as tensile strength, tear strength, elongation, wear resistance, and has properties such as abundant elasticity, high mechanical strength, and excellent wear resistance. In the present invention, phenol melamine It is most stable to mix 5 weight part with respect to 100 weight part of cocondensation resin.

In addition, isocyanate (Iso cyanate) is added for the crosslinking reaction with the urethane, it is mixed by the mixing ratio of 5 parts by weight of phenol melamine cocondensation resin, unsaturated polyester resin which is a polycondensation resin of acid and alcohol The polymer is mixed with an acrylic ester having excellent flexibility, weather resistance, adhesiveness, and adhesion induction in a functional group.

As described above, 40 mesh resin coating rolls are provided in the fourth impregnation tank that accommodates the mixed resin by blending, and the raw paper which is dried and delivered after passing through the third step is impregnated through the resin coating rolls. Although it is possible to apply, it is preferable to sufficiently apply an additive for providing the strength of the surface layer to the surface of the resin coating roll.

It is confirmed that the synthetic resin sheet that has undergone each of the above processes has an impregnation amount of 220% and a water content of 7.5%.

In addition, in the above-described third or fourth impregnation process, it is of course possible to add an additive such as far-infrared radiation material such as germanium selected to have various functions, that is, far-infrared radiation effect.

- Second Example  -

As another embodiment for producing a synthetic resin sheet in this process, it is possible to obtain a high-gloss synthetic resin sheet required by the present invention by using the LPM sheet produced by the following process.

In other words, in order to manufacture a low pressure melamine-impregnated sheet (LPM) sheet, which can be called low pressure melamine impregnation sheet, after the first impregnation process and the second impregnation process, it is dried and cooled, and then cut to an appropriate size. In order to obtain a synthetic resin sheet of LPM according to the second embodiment of the present invention, a synthetic resin sheet suitable for the present invention may be obtained through the following process.

As described above, in order to manufacture a synthetic resin sheet applicable to high glossiness in the manufacture of a conventional LPM synthetic resin sheet, urea resin is first impregnated with a raw paper, and first dried by an infrared lamp or a dry zone, and then phenol melamine In the manufacturing process of LPM synthetic resin sheet which is obtained by impregnating the raw paper obtained through the first impregnation process to the co-condensation resin, and then drying it with hot air 2 and cooling it to room temperature.

The urea resin is impregnated with LPM base by mixing at least one selected from 5 parts by weight of urethane, 5 parts by weight of isocyanate, or 10 parts by weight of unsaturated polyester resin which is a polycondensation resin of acid and alcohol. It includes being.

Alternatively, at least one selected from 5 parts by weight of urethane, 5 parts by weight of isocyanate or 10 parts by weight of unsaturated polyester resin, which is a polycondensation resin of alcohol and alcohol, may be used in the phenol melamine cocondensation resin. Mixing and impregnating the LPM base paper.

Synthetic resin sheet made of LPM according to the embodiment described above can remove the deterioration of adhesive force generated from the existing LPM sheet when the UV coating process, which is a third process to be described later, to smooth adhesion with the plate-like material It is possible to provide a plate material.

Thus, a plate-like material can be manufactured using the high gloss synthetic resin sheet obtained by each Example.

For example, hot pressing is carried out for 40 seconds to 1 minute under conditions having a pressure of 20 kgf / cm to 22 kgf / cm and a temperature of 180 ° C. in a state of being in contact with the surface of the plate-like material, respectively.

The high gloss synthetic resin sheet thus obtained was hot pressed for about 40 seconds to 1 minute at a temperature of about 180 ° C. at a unit pressure of 20 kgf / ㎠ while being in contact with the surface of a plate material for application to furniture and floor plywood. By sticking, the plate-shaped material of the state with the favorable adhesive force of a synthetic resin sheet can be obtained.

On the other hand, by coating the surface of the plate material, which is the workpiece in the state of adhesion between the synthetic resin sheet and the plate material to be hardened by the UV lamp, to have a high gloss, that is, a high gloss effect on the surface of the synthetic resin, When the plate material is moved in the state where the synthetic resin sheet is impregnated to the surface layer in the state of being loaded on the tray transported on the caterpillar such as conveyor conveying means, the UV coating resin liquid by the resin supply means to the surface, that is, the surface of the synthetic resin sheet ( D / S supernatant) is uniformly applied to the coating resin layer is subjected to a series of processes to be cured by the UV lamp means.

In particular, the UV-coated resin solution to be applied to the present invention is a monomer (acrylate) having an unsaturated polyester resin, which is an ester-based resin, which is an acid, an alcohol condensation polymerization resin, an acrylic resin, and a recoupling accelerator, respectively. It is obtained by mixing in a compounding ratio of 1: 1.

The UV coating resin liquid mixed by such a mixing ratio is evenly applied to the surface of the plate material transported in the state seated on the tray, and the plate material by irradiation of the UV lamp toward the surface of the plate material to be coated. The surface layer can be cured to obtain a plate-like material having a finished high gloss surface.

Claims (1)

5 parts by weight of urethane, 5 parts by weight of isocyanate or 10 parts by weight of unsaturated polyester resin, which is a polycondensation resin of acid and alcohol, by mixing at least one selected from urea resin or phenol melamine copolymer resin, In urea resin,
20 parts by weight of Dispersing Agen and 5 parts by weight of a release agent are added and mixed based on the phenol melamine cocondensation resin to be first impregnated in the first impregnation tank.
After the primary drying by infrared lamp or dry zone, the base paper obtained through the first impregnation process to the phenol melamine copolymer resin,
100 parts by weight of phenol melamine cocondensation resin, 5 parts by weight of silver nanoparticles having a concentration of 1000 ppm and a weakly acidic average particle of 5-20 nm (nanometer), 5 parts by weight of methyl ethyl ketone (MEK) After the first impregnation in the secondary impregnation tank containing 70 parts by weight of titanium oxide (TiO) and 0.8 parts by weight of the curing agent is mixed in the secondary impregnating tank to receive the mixed resin, and then dried in the dry state,
A method for producing a synthetic resin sheet for high gloss, which is secondly impregnated and then secondarily dried with warm air and cooled to room temperature.