KR100836590B1 - Latex coating having natural rubber and watersoluble wall paper using the same and manufacturing method thereof - Google Patents

Abstract

The present invention is a material of acrylonitrile copolymer of liquefied gas of iso-butane and n-pentane in a compound composed of natural rubber latex (cis-1,4-linked polyisoprene) and EVA (ethylene-vinyl acetate copolymer) having excellent antibacterial properties. It provides a natural and friendly aqueous foam wallpaper that is harmless to the human body using the micro-encapsulated aqueous foam agent.

Natural Rubber Latex, Water Soluble Vaporizer, Latex Wallpaper, Aqueous Foam, Non-Woven Aqueous Latex Wallpaper

Description

Latex coating having natural rubber and water soluble wall paper using the same and manufacturing method

1 is a manufacturing process diagram of a water-soluble foam wallpaper using a natural rubber latex according to the present invention

Figure 2 is a cross-sectional view of the water-soluble foam wallpaper using a natural rubber latex according to the present invention

Figure 3 is a cross-sectional view of the non-woven latex water-soluble foam wallpaper using a natural rubber latex according to the present invention

* Explanation of symbols for the main parts of the drawings

10: wallpaper base layer 20: water-soluble val photoner coating layer

30: water-soluble Primer coating layer 40: aqueous printing ink coating layer

50: water-soluble surface protective coating layer A: nonwoven fabric base layer

B: water soluble adhesive layer

The present invention relates to a natural friendly natural rubber-based latex coating agent harmless to the human body, excellent in antimicrobial properties, a water-soluble foam wallpaper using the same and a method of manufacturing the same.

Existing foam wallpaper protects the walls and prints various colors and beautiful patterns, which not only show the effect of interior decoration such as living room, room, dining room, office of apartment or detached house, but also have excellent effect on insulation, insulation and elasticity. However, a problem arises because the material used for the foamed wallpaper is composed of fine polyvinyl chloride particles containing a large amount of dioctyl phthalate (DOP).

While polyvinyl chloride is flame retardant and has strong water resistance, it is decomposed by heat or light to generate hydrogen chloride, hydrogen chloride gas during combustion, and releases a harmful chemical called dioxin upon disposal. It is a problem.

In addition, phthalic acid (DOP, etc.), which is used as a plasticizer, releases environmental hormones (endocrine obstacles) that are harmful to the human body, and are therefore regulated.

In order to solve these problems, Korean Patent Application No. 1997-0009998 has been registered, and 2003-0065349 and 2003-0077584 have been filed, and these technologies are all based on a water-soluble acrylic resin. I use it.

The coating agent for foam wallpaper composed of existing acrylic resins has similar emboss moldability and texture as PVC silk wallpaper, but has high surface cracking and insufficient hardness at high foaming (coating thickness of more than 0.65mm). Have

The present invention is to solve the problems described above, using natural rubber-based latex harmless to the environment, while maintaining the emboss moldability and persistence and soft texture of the characteristics of the existing PVC silk wallpaper, while at the same time, crack ( It is an object of the present invention to provide a quality wallpaper similar to PVC wallpaper, to sufficiently compensate for the disadvantages of crack generation.

Another object of the present invention is to compensate for the weakness of the lack of whiteness and instability of heat and the easily aging of rubber having natural rubber latex, thereby improving whiteness and heat resistance and preventing aging of rubber.

Still another object of the present invention is to simplify the process and reduce fuel costs by providing a method for producing a foamed wallpaper in which the secondary foaming step is omitted.

The natural rubber latex coating agent of the present invention is a binder 30 to 45% by weight of a natural rubber latex, one selected from EVA (ethylene-vinyl acetate copolymer) or styrene butadiene rubber (SBR) or acrylic resin, water-based foaming agent 1-4 Weight percent, inorganic filler 30-50 wt%, additives 5-10 wt% and the balance water.

In the method of manufacturing the foamed wallpaper of the present invention, the mixed solution obtained by adding an aqueous foaming agent such as isobutane or N-pentane to the coating agent is coated on the surface of the wallpaper and foamed, and then the surface is coated again with a water-soluble primer and printed. And then dried and embossed.

The foamed wallpaper of the present invention is composed of a lamination of a natural rubber latex coating layer, a water-soluble primer layer, an aqueous printing ink coating layer, and a water-soluble surface protective coating layer on the wallpaper base layer.

Hereinafter, the present invention will be described in detail.

The binder of the coating agent of the present invention consists of a mixture of natural rubber latex and one synthetic resin selected from EVA (ethylene-vinyl acetate copolymer), styrene butadiene rubber (SBR) and acrylic resin, the content of which is 30 -45% by weight is appropriate. If less than this range, there is a problem that the tensile strength of the coating film worsens and the embossing property is insufficient, if the above exceeds this range, the hardness of the coating film is weakened and the scratch resistance is insufficient.

The mixing ratio of the two components is appropriate when the mixing ratio of natural rubber latex: synthetic resin is 75: 25 to 80: 20 by weight, and when the ratio of natural rubber latex exceeds the above range, film formation, tensile strength, embossing The moldability is good but the scratch resistance is insufficient, and when the content of the synthetic resin exceeds the above range, the whiteness and scratch resistance are improved, but the emboss moldability is lowered.

Since the adhesiveness and transferability with the water-soluble ink layer are reduced due to the nature of the natural rubber latex, it is necessary to coat the printing ink after coating the water-soluble primer coating agent on the surface of the water-soluble foam coating layer before printing. In addition, if more than 10% by weight of the synthetic resin is added to the entire coating agent surface cracking will appear, it should be added within this range.

When the acrylic resin is used as the synthetic resin, the crack and sticky change according to the Tg value of the acrylic resin becomes more severe, and therefore, the Tg value should be used in the range of -5 to 5 ° C. If the Tg value is out of the above range, stickiness and cracking increase sharply and the physical properties of the coating agent are significantly lowered.

The blowing agent used in the present invention is microencapsulated isobutane or N-pentane with a material of acrylonitrile copolymer, and in order to obtain a uniform foaming surface, it is preferable to use a mixture of low-temperature and high-temperature foams. Do. Suitable content of blowing agent is 1 to 4% by weight. In the case of exceeding this range, there is a problem that the crack (crack) is severe or the hardness of the surface is weakened and the scratch resistance is insufficient.

The coating agent of this invention contains 30-50 weight% of inorganic fillers. Examples of inorganic fillers that can be used include silica (SiO ₂ ), calcium carbonate (CaCO ₃ ), aluminum hydroxide (Al (OH) ₃ ), and the like. Silica (SiO ₂₎ is sikimyeo prevent thermal stability and aging the natural rubber latex and to increase the tensile strength, calcium carbonate (CaCO ₃₎ or aluminum hydroxide (Al (OH) ₃₎ is to maintain the storage stability of natural rubber latex coating Improves fluidity. In particular, aluminum hydroxide (Al (OH) ₃ ) increases whiteness and improves storage safety, and significantly improves liquid flow and storage safety compared to general acrylic-based coatings for water-soluble foam wallpapers.

The additive used in the present invention is a water-repellent agent, far-infrared radiation substance, dispersant, antifoaming agent, brightener, amine and the like is used in 5 ~ 10% by weight.

Polyethylene or paraffin-based water repellents may be used to prevent sticky of the surface and to enhance scratch resistance. The appropriate amount of use is 0.5 to 1% by weight. Excessive use of a water repellent may roughen the foam surface, and boiling within the film formation of the surface may occur, so use within the above range is required.

Far-infrared radiation can be used as an additive, and the effect of deodorization on odor can be seen due to the far-infrared radiation emitted. The far-infrared radiating materials that can be used include jade, germanium, elite, and the like, and an appropriate amount of use is 3 to 7 wt%. If it exceeds the above range, there is a problem that the whiteness is insufficient, the foam surface is rough, and the deodorizing effect due to far-infrared radiation is inferior.

In addition to the present invention, a small amount of additives may be used to compensate for the physical properties of the fine parts. 0.1 wt% to 0.5 wt% of the dispersant may be added to the storage stability of the natural rubber latex and the inorganic filler, and 0.01 wt% to 0.05 wt% of the antifoaming agent may be added to suppress bubbles generated during manufacture.

In addition, the desired whiteness can be obtained by adding 0.05% to 2% by weight of TiO ₂ and a brightener to correct the pale yellow color which is a disadvantage of natural rubber latex.

During manufacture, instantaneous raw rubber precipitation occurs due to the change of pH of natural rubber latex, and when mixed with EVA resin and inorganic filler, entanglement with resin may occur, and in order to prevent this, 0.01 weight of amine % To 0.05% by weight may be added.

The coating agent of the present invention composed of the above compounding ratio exhibits no stickiness and soft embossability similar to the conventional PVC texture, even though the coating thickness does not occur even when the coating thickness is 0.65 mm compared to the coating agent of the existing water-soluble acrylic resin. .

Therefore, conventional water-based acrylic coatings are less embossed than PVC, so the hardness of the back roll (hard) is preferred, or the embossing roll (patterning roll) pressure compared to PVC A high pressure of 3 to 5 times is recommended (possibly less than 10 kg / cm 2 of emboss pressure of PVC, and 10 to 50 kg / cm 2 of aqueous emboss pressure). However, coatings based on natural rubber latex are embossable under pressure similar to PVC.

Method for producing a natural rubber latex wallpaper of the present invention is as follows.

Coma coater and screen method to coat the coating with 0.2 ~ 0.6㎜ to pass through the first chamber (geling and foaming completed) → coating water-soluble primers → coating water-soluble printing ink → second-chamber passing (heating) → embossing molding → 1st Cutting → 2nd Cutting → Product

The production of latex wallpaper laminated with a nonwoven fabric is laminated with a nonwoven fabric (20 ~ 30g / ㎠) using an EVA-based water-based adhesive on the back surface of the wallpaper base material and coating a coating film for water-soluble foam wallpaper prepared according to the present invention on the wallpaper base material You can feel the strong elasticity and texture of the surface with cushions due to the texture felt on the nonwoven fabric.

Therefore, non-woven fabric → EVA adhesive → wallpaper base material → water-soluble foam coating coating → gelling, foaming → water-soluble primer coating → water-soluble printing ink coating → 2nd amber through (heating) → embo molding → 1st cutting → 2nd cutting → product Proceed in order.

In addition, when giving a flame retardancy to the natural rubber latex wallpaper using the base paper given the flame retardancy can be expected by the effect of flame retardant by adding 60 to 100 parts by weight of inorganic hydroxide flame retardant of aluminum hydroxide series with respect to 100 parts by weight of the coating agent.

Water-soluble primer coating agent consists of EVA resin and acrylic resin. The optimum mixing ratio of the water-soluble primer coating agent is 45 to 55% by weight of EVA resin, 25 to 35% by weight of acrylic resin, and 5 to 10 polyethylene wax to prevent the stickiness of the EVA resin and to increase the transferability of the ink. 1 wt% and 2 wt% of the water-soluble wetting agent of the polyester siloxane copolymer series and the balance of water.

In addition, 10 to 30 parts by weight of alcohol may be added to 100 parts by weight of the composition in order to improve drying of the water-soluble primer coating agent, and 1 to 3 parts by weight of an antifoaming agent may be added to remove bubbles generated during manufacture. .

An embodiment of the present invention is as follows.

(Example 1)

* Property change test according to the ratio of natural rubber latex (R) and ethylene-vinyl acetate copolymer (EVA) (E)

As confirmed by Table 1, when the content of the natural rubber latex is less than the range required by the present invention, the tensile strength and the embossability is insufficient, cracks appear on the foam surface, the content of the natural rubber latex If excessively increased, ink adhesion of the foamed surface is insufficient, and problems of whiteness, heat resistance, and aging are appearing.

TABLE 1

(Example 2)

* Property change test according to the ratio of natural rubber latex (R) and styrene-butadiene latex (SBR) (S)

As confirmed by Table 2, when the ratio of SBR exceeds the range of the present invention, the tensile strength is insufficient and cracks of the foam surface appear, and if it is less than the range of the present invention, Tacky remains. There is not enough scratch resistance.

TABLE 2

(Example 3)

* Property change test according to Tg value of natural rubber latex (R) and acrylic resin

As confirmed by Table 3, when acrylic resin is used as the synthetic resin, physical properties change depending on the Tg value of the acrylic resin.

If the Tg value exceeds the range of the present invention, the tensile strength is insufficient and cracking of the foam surface is increased. If the Tg value is less than the range of the present invention, the tensile strength is good, but the foam surface is rough, and the scratch resistance is insufficient. This shows the problem.

TABLE 3

(Example 4)

* Property change test according to the ratio of ethylene-vinyl acetate (EVA) (E) and acrylic resin (AR) of water-soluble primer coating agent

As can be seen from Table 4, when the ratio of EVA is high, there is no problem of tensile strength and cracking, but stickiness is significantly increased, so scratch resistance is insufficient, and when it is low, tensile strength is insufficient, cracking of the surface. It shows a problem that causes.

TABLE 4

(Example 5)

* Manufacture of natural rubber latex coating

0.2 g of dispersant was added to 6.35 g of water, and 1.5 g of titanium dioxide was added as a brightener. Subsequently, 8.9 g of EVA resin was slowly added while stirring to disperse the particles of titanium dioxide well, and then 2.5 g of the isobutane blowing agent microencapsulated with acrylonitrile copolymer was added with care not to be destroyed by excessive dispersion. In order to prevent the entanglement of 0.02g of amine pH adjuster was added. 4.5g of jade was added to the far-infrared radiation material and stirred to disperse the particles evenly, and then 35g of natural rubber latex was added thereto while slowly stirring to prevent precipitation of the natural rubber latex. When excessively dispersed in a moment, there is a fear that natural rubber latex precipitates.

When all natural rubber latex is added and fully wetted, 40g of inorganic filler (calcium carbonate, silica, aluminum hydroxide, etc.) is added and dispersed evenly, but some instant entanglement may occur due to the difference in pH depending on the composition of inorganic filler. Therefore, the particle size and pH were well selected and sufficiently stirred and dispersed. 1 g of a water repellent and 0.03 g of an antifoam were added thereto to remove bubbles generated during the dispersion process.

(Example 6)

* Preparation of Water Soluble Primer

3 g of water, 11 g of alcohol, and 46 g of EVA resin were added thereto, and the mixture was slowly stirred to sufficiently wet the water, the alcohol, and the EVA resin. Subsequently, 32 g of acrylic resin was slowly added thereto, and the mixture was stirred while being careful not to cause entanglement with the EVA resin.

In order to increase the transferability of natural rubber latex coated sheet paper, 1 g of a water-soluble wetting agent of polyester siloxane copolymer series was added, 6 g of polyethylene wax was added, stirred to disperse evenly, and then an antifoaming agent was removed to remove bubbles generated during blending. 1g was added.

(Example 7)

* Manufacture of foamed wallpaper

The natural rubber latex coating agent obtained in Example 6 was coated with 0.2mm ~ 0.6mm on the wallpaper base paper by comma-cotta and screen method, and passed through the primary chamber set at 180 ~ 190 ℃ to complete the gelling and foaming. . The foaming surface was stable and fine sheet paper was obtained while foaming was all performed. In order to increase the interlayer adhesion with the water-soluble ink, the water-soluble primer obtained in Example 6 was coated using a cylinder liner 120 to 150 lines by a gravure printing method, followed by coating a water-soluble printing ink.

Coated water-soluble surface protective coating made of acrylic resin and silicone and polyethylene wax to reinforce the stain resistance and scratch resistance on the printed layer, and the secondary set at 180 ~ 190 ℃ like the primary chamber to give drying and embossing. After passing through the chamber, the embossed roll was cut to form the wallpaper.

The coating is coated in a comma-cota and screen method to measure the temperature of the foam paper surface when passing through the primary chamber.The foam surface is stable at 95 ~ 110 ℃, and the embossing is maintained at 120 ~ 130 ℃ when passing the second chamber. Aptitude was maintained. When the temperature is exceeded, the carbonization phenomenon of the sheet paper may not be able to feel the texture of the existing PVC wallpaper, and may be a barrier to reproduce the optimal wallpaper.

When embossing, embossing is possible even when the pressure of engraving roll is less than 10kg / ㎠, which is the pressure used in conventional PVC molding. High pressure of ~ 50kg / ㎠)

The present invention compensates for the disadvantages of embossability and cracking in conventional water-based acrylic coatings, and improves the workability to produce without major differences in the present PVC production process. By using friendly natural rubber latex, it is possible to obtain PVC-like products that are harmless to human body and have various physical properties.

Claims (9)

30 to 45% by weight of a binder composed of 75 to 80 parts by weight of natural rubber latex and 25 to 30 parts by weight of one kind of synthetic resin selected from ethylene vinyl acetate copolymer, styrene butadiene rubber or acrylic resin, isobutane or N-pentane 1-4% by weight of an aqueous foaming agent microencapsulated with a nitrile copolymer material, 30-50% by weight inorganic filler, 0.5-1% by weight water repellent, 3-7% by far infrared ray emitting material, 0.1-0.5% by weight dispersant, 0.01- defoaming agent Natural rubber-based latex coating agent consisting of 0.05% by weight, brightener 0.05-2% by weight, amine 0.01-0.05% by weight, balance. The natural rubber-based latex coating of claim 1, wherein the acrylic resin has a Tg value of -5 to 5 ° C. 2. The natural rubber latex coating of claim 1, wherein the inorganic filler comprises silica, calcium carbonate or aluminum hydroxide. The natural rubber-based latex coating agent of claim 1 coated on the wallpaper base layer by a comma coater or screen method with a thickness of 0.2 ~ 0.7mm, coated with water-soluble primer on the foamed surface and printed, dried and embossed natural Rubber latex foam wallpaper. The natural rubber-based latex foam wallpaper of claim 4, wherein a nonwoven fabric is laminated on the back surface of the wallpaper base paper. delete The water-soluble primer composition of claim 4 is 45 to 55% by weight of ethylene vinyl acetate copolymer resin, 25 to 35% by weight of acrylic resin, 5 to 10% by weight of polyethylene wax, polyester siloxane copolymer water-soluble Natural rubber-based latex foam wallpaper consisting of 1 to 2% by weight wetting agent and residual water. 8. The natural rubber latex foam wallpaper of claim 7, wherein 10-30 parts by weight of alcohol and 1-3 parts by weight of an antifoaming agent are added to 100 parts by weight of the water-soluble primer. Using a natural rubber-based latex coating of claim 1 coated with a coating material 0.2 ~ 0.7 mm to the wallpaper base by a comma coater or screen method to pass through the first chamber, coating a water-soluble primer (primer) coating, water-soluble printing ink coating step , Secondary chamber passing step, embossing forming step and cutting step of producing a natural rubber-based latex foam wall paper characterized in that it goes through.

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