KR20030071057A - manufacturing method of synthetic resin sheet with continuous keep self adhesive - Google Patents

Abstract

PURPOSE: A method for preparing a synthetic resin sheet is provided, to obtain the synthetic resin sheet which can maintain the self-viscosity continuously, has an excellent adhesive strength and allows the pollutant to be removed easily. CONSTITUTION: The method comprises the steps of dissolving 40-95 wt% of SBR rubber and 5-60 wt% of NBR rubber into a solvent mixture of toluene and xylene of 30-80 deg.C for 2-3 hours to prepare the first resin solution; dissolving a styrene-isoprene-styrene block copolymer resin into a toluene solvent mixture of 30-80 deg.C for 1-3 hours to prepare the second resin solution (20-80%); mixing a polybutene resin and a whale oil in the ratio of 30:80 to 70:20, dissolving the mixture into a toluene solvent mixture, and adding 10-20 wt% of an additive comprising 6-10 wt% of a stabilizer, 3-7 wt% of an antioxidizing agent and 1-3 wt% of a flame retardant to the mixture to prepare the third resin solution; mixing the first, second and third resin solution in the ratio of 30-60 : 20-50 : 15-25 by weight at 30-80 deg.C to prepare a transparent resin mixture; and pouring the resin mixture on a releasing plate by the thickness of 0.2-1.5 mm and drying it at 40-90 deg.C to prepare a sheet.

Description

Manufacturing method of synthetic resin sheet with continuous magnetic viscosity {manufacturing method of synthetic resin sheet with continuous keep self adhesive}

The present invention relates to a method for manufacturing a synthetic resin thin plate that maintains its self-viscosity continuously, and more particularly, it is used in various office supplies, billboards, guide plates, drawing boards, etc. which are art supplies for outdoor use. It is for the convenience of long-term convenience to manufacture the fixing plate.

In the past, there were many various sheets using magnetic viscosity, but there was a disadvantage that the reuse was not possible or the life was not long.

In other words, the adhesive using the acrylic adhesive was not possible to reuse because it is only about sticking the object in a sticker manner, and the adhesive that was attached and detached as the object of the present invention was a synthetic resin of a urethane lever manufactured by mixing urethane with isocyanate. Although there was a thin plate, the surface of urethane hardened by hardening by bonding with oxygen in the air if used for a long time, so it lost its adhesiveness and did not have a long life.In addition, when it is used outdoors, it is faster There was a drawback of oxidizing and losing the function of the pressure-sensitive adhesive.

On the other hand, the pressure-sensitive adhesive that can be attached and detached by attaching the adhesive to the memo paper, the adhesive strength is weak, it is difficult to attach the daily necessities such as writing supplies or knives. When it was contaminated with dust, it could not be cleaned and had a long life.

The present invention is to provide a synthetic resin thin plate that can be used semi-permanently by supplementing the drawbacks and disadvantages of the prior art as described above, as well as strong enough to the desired adhesive strength in the open air, indoors and continuously.

In order to achieve the object of the present invention, the present inventors conducted a long-term study, styrene butae rubber (hereinafter referred to as "SBR rubber") and nitrile butadiene rubber (hereinafter referred to as "NBR rubber") ) Is dissolved in a mixed solvent of toluene and xylene, and styrene-isoprene-styrene block co-polymer in the mixed solvent described above. A third resin solution obtained by mixing a second resin solution, a polybutene resin, and a light oil (whale oil) in a toluene solvent was mixed with a stabilizer, an antioxidant, and a flame retardant. By mixing and drying to the desired size and thickness it is possible to produce a thin sheet of synthetic resin of the purpose.

Hereinafter, the configuration and operation of the present invention in detail.

All% of the present invention is weight%.

1. Resin manufacturing process

Preparation of First Resin Solution

40 to 95% of SBR rubber and 60 to 5% of NBR rubber are gradually dissolved in a mixed solvent of toluene and xylene (their mixing ratio is about 9: 1). At this time, the temperature of the mixed solvent is maintained at 30 to 80 ℃, the mixing is dissolved for about 2 to 3 hours at a rotational speed of 150rpm completely dissolved to obtain the desired resin solution.

If the amount of SBR rubber is more than 95%, that is, if the NBR rubber is less than 5%, the dissolution is fast, but the resin solution becomes too soft, the adhesive strength is lowered, and the adhesion effect is lowered to the final product, whereas the SBR rubber is less than 40%. In other words, if the NBR rubber exceeds 60%, not only it takes a long time to dissolve, but the resin solution becomes gel in a sol state and is too hard, resulting in poor workability in the next step. In addition, when the temperature of the mixed solvent is less than 30 ℃, the solvent maintains the gel state, so it is difficult to mix and the workability decreases, which is a factor of increase in production cost, and thus it is not economical. There is a disadvantage that it is difficult to manufacture the thin plate by printing. On the other hand, the dissolution time is different depending on the ratio and temperature of the mixture, if dissolved within 2 hours, the problem of increasing the temperature and the complete dissolution is difficult, and if a long time is more than 3 hours, there is a problem that the productivity is lowered.

Preparation of Second Resin Solution

The styrene-isoprene-styrene block co-polymer (hereinafter referred to as "copolymer") is gradually added to 20 to 80% with respect to 100 parts by weight of the toluene mixed solvent, which is a solvent as described above. The solution is dissolved for 1 to 3 hours while maintaining at 30 to 80 ° C. to form a second resin solution. At this time, when the amount of the copolymerized resin is less than 20%, since the resin flows down, it is difficult to form the mold and the workability is lowered. When the amount of the copolymerized resin is more than 80%, the viscosity becomes too high to make the molding work difficult. On the other hand, temperature and time are for the same reason as the conditions of manufacture of said 1st resin solution mentioned above.

Preparation of Third Resin Solution

The resin, which is mixed with polybutene resin and light oil, in a ratio of 30 to 80: 70 to 20, is slowly added to the toluene mixed solvent while stirring well to obtain a sticky solution. A third resin solution is prepared by stirring 6 to 10% of the stabilizer, 3 to 7% of the antioxidant, and 1 to 3% of the flame retardant to 10 to 20% in total, to complete mixing.

At this time, if the ratio of polybutene is less than 30%, that is, if the ratio of diesel oil exceeds 70%, the viscosity becomes too low, and drying is difficult in the molding process, and if it exceeds 80%, that is, if the content of diesel oil is less than 20%, drying is easy. However, the viscosity is so strong that workability and life is shortened.

On the other hand, when the total amount of the stabilizer, antioxidant and flame retardant is less than 10%, premature curing occurs, yellowing occurs, shortening the lifespan, and causing deformation of the shape according to external conditions such as heat. When the percentage is exceeded, the product becomes a misty state, and the transparency is lowered, thereby lowering the product value.

As these stabilizers, white carbon is suitable, phenyl diisodecyl phosphate is used as an antioxidant, and tri-cresyl phosphate (TCP) is suitable as a flame retardant.

2. Resin Mixing Process

The first resin solution, the second resin solution, and the third resin solution are maintained at about 250 to 300 cps, respectively, and then 30 to 60% of the first resin solution, 20 to 50% of the second resin solution, and the third resin solution. When mixed well in a mixer while maintaining a temperature of 30 to 80 ° C. at a ratio of 15 to 25% of a resin solution, a transparent mixed resin is obtained.

If the first resin solution is less than 30%, the rubber component is insufficient and molding is difficult. On the contrary, if the first resin solution is more than 60%, the physical properties become too hard, resulting in poor workability and difficulty in forming a thin sheet. In addition, when the content of the second resin solution is less than 20%, the viscosity and the tensile force are dropped, so that it becomes like a busy paper, and mold molding is impossible. When the content of the second resin solution is more than 50%, the tensile strength and the stretching force become strong, and workability is significantly reduced. On the other hand, when the content of the third resin solution is less than 15%, premature curing and yellowing occur in the mixture to shorten the lifespan, and when the content of the third resin solution exceeds 25%, the transparency of the resin is lowered and the commodity value is lowered.

On the other hand, if the temperature falls below 30 ° C during mixing, the molecular weight of the resin becomes large and the resins are entangled with each other and the mixing time becomes too long, resulting in poor workability. On the contrary, when the temperature exceeds 80 ° C, the blacking phenomenon may occur. In addition, intermolecular cohesion may be reduced, resulting in deterioration of quality. Usually, a mixing time of about 24 hours is required at 30 ° C and a mixing time of about 10 hours at 80 ° C. However, many tests have shown that a working time of about 15 hours at 60 ° C is most suitable and stable.

3. Sheet Metal Forming Process

The mixed transparent composite resin solution is poured on a release paper plate of a desired size to maintain a thickness of 0.2 to 1.5 m / m, and then dried in a drying furnace at 40 to 90 ° C. to prepare a synthetic resin thin plate which continuously maintains the desired magnetic viscosity. will be.

If the thickness of the thin plate is less than 0.2m / m, the solvent is volatilized and the solid content becomes too thin to function properly as an adhesive, and the adhesive is easily separated from the plate to shorten the life. When the thickness exceeds 1.5m / m, The resin layer is so thick that it is difficult to dry inside the resin, making it difficult to proceed to the next work (finishing work such as loading and packing).

On the other hand, if the temperature of the drying furnace is less than 40 ℃ drying time is too long to reduce the productivity, if it exceeds 90 ℃ should be noted that there is a risk that the resin will melt and flow down, drying time is the thickness of the product and drying furnace The temperature may vary depending on the temperature, and it is generally preferable to dry it within a time of 1 hour to 6 hours.

<Example>

In order to help the understanding of the present invention will be described the most preferred embodiment as follows.

In the resin manufacturing process, the first resin solution was dissolved in SBR 85% and NBR 15% in a toluene mixed solvent at 60 ° C. for 2 hours in a mixer having a rotational speed of 150 rpm, and the second resin solution was prepared from the toluene mixed solvent. 40% by weight is slowly dissolved at 70 ° C. over 2 hours, and the third resin solution is mixed with polybutene resin and light oil in the same ratio to be dissolved in a toluene mixed solvent and then white carbon by weight. 8%, 5% of phenyl diisodecyl phosphate and 2% of TCP were mixed, and then, at a temperature of 60 ° C. at a ratio of 45% of the first resin solution, 35% of the second resin solution, and 20% of the third resin solution. Work 15 hours and mix thoroughly.

The obtained mixed resin was poured on a thin sheet of release paper having a size of 400 m / m × 500 m / m and poured into a thickness of 0.6 m / m and dried in a drying furnace at 60 ° C. for 200 minutes to prepare a synthetic resin thin plate.

The obtained product was not detrimental to detaching the knife or pencil as well as the ruler and the compass. The product was able to be used again after wiping with a mop, and the function was not degraded even after 300 detachment.

In addition, it retains strong viscosity but does not tear the paper when attached and detached.

The present invention is manufactured by a simple process as described above, but excellent adhesion, and does not damage the adherend, it can also remove the contaminants with a mop when it is contaminated, and the self-viscosity that the life can be used semi-permanently It is a very useful invention to provide a synthetic resin sheet to maintain.

Claims (2)

In the method for producing a synthetic resin thin plate, a first resin solution obtained by dissolving 40 to 95% of SBR rubber and 60 to 5% of NBR rubber in a mixed solvent of toluene and xylene at 30 to 80 ° C. over a period of 2 to 3 hours in a resin manufacturing process. And a second resin solution, a polybutene resin and a light oil obtained by dissolving the styrene-isoprene-styrene block copolymer resin in 20 to 80% with respect to the toluene mixed solvent at 30 to 80 ° C for 1 to 3 hours. 6-10% of stabilizer, 3-7% of antioxidant and 1-3% of flame retardant were added to the solution which melt | dissolved resin mixed in the ratio of 80-70: 20 in the toluene mixed solution mentioned above, and these sum totaled 10-20 A resin manufacturing step of mixing the mixture so as to be% and making the third resin solution completely; The first resin solution, the second resin solution, and the third resin solution are mixed in a mixer while maintaining a temperature of 30 to 80 ° C. at a ratio of 30 to 60%, 20 to 50%, and 15 to 25%, respectively, and transparent mixing. A resin mixing step of obtaining a resin, Production of a synthetic resin thin plate which continuously maintains the magnetic viscosity, characterized in that it is a thin plate forming step of pouring the obtained transparent mixed resin on a release paper plate at a thickness of 0.2 m / m to 1.5 m / m and drying in a drying furnace at 40 to 90 ° C. Way. The mixed solvent of toluene and xylene is a ratio of 90% toluene and 10% xylene, white carbon as a stabilizer, phenyl diisodecyl phosphate as an antioxidant, TCP (tricresyl phosphate as a flame retardant) Method for producing a synthetic resin thin plate to maintain the magnetic viscosity continuously, characterized in that the use of).