KR101314722B1 - Environment-friendly coating composition for building interior material - Google Patents

Abstract

The present invention relates to an environmentally friendly coating composition for building interior materials, including binders, fillers, plasticizers, water and other additives, in particular ethylene vinyl acetate (EVA) as a binder, modified starch as an organic filler In addition, the present invention relates to an environmentally friendly coating composition for building interior materials using an epoxy emulsion as a plasticizer. The eco-friendly coating composition according to the present invention increases the biodegradability by using ethylene vinyl acetate (EVA) as a binder, and prevents the generation of volatile organic compounds (VOC) by using an epoxy emulsion as a plasticizer. The use of organic solvents can be suppressed, and the addition of hydrophobic modified starches as organic fillers has the effect of reducing the tacky of the coated composition and increasing the drying speed, improving workability, and using water as a solvent. Adult coating compositions can be provided.

Description

Eco-friendly coating composition for building interior materials {ENVIRONMENT-FRIENDLY COATING COMPOSITION FOR BUILDING INTERIOR MATERIAL}

The present invention relates to an environmentally friendly coating composition for building interior materials, more specifically comprising a binder, a filler, a plasticizer, water and other additives, in particular using a biodegradable polyester as a binder, using a hydrophobic modified starch as an organic filler And an environmentally friendly coating composition for building interior materials using an epoxy emulsion as a plasticizer.

Recently, due to the growing interest in health, eco-friendly and harmless interior materials for building interior materials such as wallpaper, vertical, blind, curtain, gypsum board, molding, MDF, OSB, space wall, panel, ceiling board, box, stairway, tex, etc. The demand for is growing.

In recent years, in order to give a wallpaper a pattern, the foamed wallpaper (silk wallpaper) which foamed the surface is used a lot. Foamed wallpaper is manufactured by applying a sol-like foaming source containing synthetic resin as a main raw material on a base paper. Most of the foam sources currently in use consist of polyvinylchloride (PVC), dioctyl phthalate (DOP) and chemical blowing agents.

The conventional technique described above requires the use of a plasticizer DOP to prevent thermal decomposition of PVC and impart elasticity. That is, by using DOP to liquefy PVC and improve fluidity, the secondary transition temperature is lowered to enable micro brown movement of the PVC molecular segment at low temperature, and a sol phase having a flexible elasticity at room temperature can be obtained.

However, this technique has a problem in that the working environment is not good and a separate dust collector is required since the DOP gas harmful to the human body is generated at the foaming temperature of the chemical blowing agent used at 150 ° C to 205 ° C. DOP is a toxic substance whose use is strictly restricted in the US and Japan due to its harmfulness. In addition, the final product manufactured by this technology has a bad effect on the human body because the DOP remaining on the surface is gradually volatilized at room temperature, so that when used as wallpaper, DOP exists in the room for several weeks to several months. In addition, in case of fire, toxic fumes such as chlorine gas are generated, making it a major cause of asphyxiation.

In order to solve this problem, recently, wallpaper using artificial or natural materials to replace the PVC wallpaper has been developed. Korean Laid-Open Patent Publication No. 2001-0087057 discloses a method for producing a wallpaper prepared by applying a water-soluble coating composition composed of vinyl acetate acrylic ester ethylene copolymer, polyvinyl alcohol, a surfactant, water, and the like on a sheet of paper or paper. have. In addition, Korean Patent Laid-Open Publication No. 2002-0080054 discloses a coating composition made by mixing a synthetic resin such as an acrylic resin and natural materials such as wood flour, rice husk flour, cork flour, and hay flour. In addition, the Republic of Korea Patent Publication No. 10-0280334 coated biodegradable binder on the backing paper, and biodegradable plastering material added thermally expanded vermiculite, such as wood flour, rice husk, deciduous leaves, hay flour, ground coffee grounds, etc. A biodegradable wallpaper coated with a top coating layer containing a far infrared ray emitting material and an antimicrobial agent is disclosed.

However, the synthetic resin coating composition disclosed in the above documents are somewhat inferior in physical properties including PVC printing properties, and in the case of coating materials using natural materials such as wood powder, the laminate coating (top coating) cannot be used again. Due to the poor physical properties, there is a problem in that the manufacturing process is complicated and economical. In addition, there is a problem that the wallpaper using the wood powder disclosed in the above documents can not be used as a foam wallpaper because there is almost no foamability.

In order to solve the problems of the prior art as described above, an object of the present invention is to provide an eco-friendly coating composition for building interior materials that improves biodegradability and expresses excellent properties.

In order to achieve the above technical problem, the present invention, biodegradable polyester, ethylene vinyl acetate (ethylene vinyl acetate; EVA) or acrylic copolymer, inorganic filler, hydrophobic modified starch as organic filler, epoxy emulsion as a plasticizer, and solvent It provides an environmentally friendly coating composition for building interior materials containing as.

The hydrophobically modified starch is preferably coated with silicon or treated with starch succinic anhydride (OSA) in starch to remove the hydrophilicity of starch by secondary reaction of Al ³⁺ .

delete

The epoxy emulsion preferably contains at least 30% by weight of an epoxy resin of bisphenol-based or modified bisphenol-based epoxy equivalent weight (EEW) of 170 to 550.

The environmentally friendly coating composition for building interior materials may further include at least one material selected from the group consisting of a humectant, a foaming agent, a colorant, and an antifoaming agent.

The inorganic filler is at least one selected from the group consisting of calcium carbonate, aluminum hydroxide, magnesium oxide and titanium dioxide, the blowing agent is isopentane or isobutane, the coloring agent is titanium dioxide or carbon, the antifoaming agent is a modified silicone or silicone polymer Do.

10 to 50% by weight of the binder of the biodegradable polyester, ethylene vinyl acetate (ethylene vinyl acetate; EVA) or an acrylic copolymer; 10 to 60% by weight of the inorganic filler; 2 to 15% by weight of the organic filler; 1 to 20% by weight of the plasticizer; 3 to 10% by weight of the humectant; 1 to 10% by weight of the blowing agent; 5 to 10% by weight of the colorant; 10 to 40% by weight of the water; And 0.1 to 1% by weight of the antifoaming agent.

The total weight of the inorganic filler and modified starch is preferably in the range of 20 to 70% by weight based on the total weight of the total composition.

The present invention also provides a building interior material using the environmentally friendly coating composition for building interior materials. Such architectural interior materials can be curtains, wallpaper, vertical or blinds and the like.

The wallpaper may include a coating layer comprising a winch, an environmentally friendly coating composition for building interior materials formed on the winch, and a printing layer formed on the coating layer.

In addition, the vertical may include a coating layer comprising a fabric, an environmentally friendly coating composition for building interior materials formed on the fabric, and a printing layer formed on the coating layer.

As described above, the eco-friendly coating composition according to the present invention can prevent volatile organic compounds (VOCs) from occurring and suppress the use of organic solvents by using an epoxy emulsion as a plasticizer, and can be modified as an organic filler. By adding starch, there is an effect of reducing the tacky of the coated composition and increasing the drying speed, thereby improving workability, and water can be used as a solvent to provide an aqueous coating composition.

Hereinafter, the present invention will be described in more detail.

The eco-friendly coating composition of the present invention relates to a coating composition that can be used to replace the PVC sol used in the existing foam wallpaper, when manufacturing the foam wallpaper using the composition of the present invention, foaming, which is the main physical properties of the foam wallpaper, Overall properties, including moldability, printability, scratch resistance, etc., are generally similar or superior to foamed wallpapers manufactured using conventional PVC sol, are biodegradable, water-soluble materials, and have no emission of dangerous substances. Although it is a horn material, the material cost is low and the processing conditions are simple, thereby reducing the cost.

The eco-friendly coating composition of the present invention comprises a biodegradable polyester, ethylene vinyl acetate (EVA) or an acrylic copolymer, an inorganic filler, a hydrophobic modified starch as an organic filler, an epoxy emulsion as a plasticizer, and water as a solvent. do.

In particular, the eco-friendly coating composition of the present invention can increase the biodegradability of the coating sol by 60 to 90% or more by using biodegradable polyester as an aqueous solution in the form of a binder, and by using modified starch as an organic filler, When the surface tension is lower than that of other materials, the starch is first floated on the surface to reduce the tacky and the drying speed of the coated composition, thereby improving the working speed. In addition, by using an epoxy emulsion as a plasticizer, the flexibility is improved to enhance the workability, moldability, printability, scratch resistance, and workability of the existing aqueous coating composition to express physical properties equivalent to those of PVC.

Environmentally friendly coating compositions of the invention include biodegradable polyesters, EVA or acrylic copolymers, wherein the biodegradable polyesters, EVA or acrylic copolymers are water soluble polymers suitable for use in the coating compositions of the invention. In addition, the biodegradable polyester, EVA or acrylic copolymer is suitable for use as a binder because it has excellent binding properties with the inorganic filler and modified starch, which is the main component of the composition of the present invention. The biodegradable polyester, EVA or acrylic copolymer may be added in the form of an aqueous solution, it is preferably added in the range of 10 to 50% by weight based on the total weight of the total composition. If the content of the aqueous solution of biodegradable polyester, EVA or acrylic copolymer is less than 10% by weight based on the weight of the total composition, the ratio of the inorganic filler and the modified starch may be relatively high, resulting in over-foaming, whereas 50% by weight If it exceeds the foaming on the surface of the coating layer is not uniform, eventually printability and formability is poor. The EVA or acrylic copolymer can be used because it is generally used in the form of 50% aqueous solution in consideration of the ease of use and commercial sales form.

Eco-friendly coating composition of the present invention includes an inorganic filler, a preferred example of the inorganic filler is preferably at least one selected from the group consisting of calcium carbonate, aluminum hydroxide, magnesium oxide and titanium dioxide. The content of the inorganic filler is preferably 10 to 60% by weight based on the total weight of the composition. If the content of the inorganic filler is less than 10% by weight based on the total weight of the composition is not uniform foaming and printability and moldability, whereas if it exceeds 60% by weight may be over-foamed.

In addition, the eco-friendly coating composition of the present invention includes a modified starch as an organic filler. The modified starch is applied in place of the conventional PVC performance, and the wallpaper using the conventional hydrophilic synthetic resin or wood powder has no sizing effect or slip property, which is indispensable for post-processing such as top coating and foaming due to poor foamability. The application to was almost impossible. On the contrary, the modified starch may be applied to a foamed wallpaper because it does not need a separate top coating by improving scratch resistance of the wallpaper by providing a slip property by giving a slip property to the wallpaper surface. .

As modified starch of the present invention, the surface of the starch is coated with silicon or the octenyl succinic anhydride (OSA) is reacted with the starch, and then Al ³⁺ is used as a secondary reaction to remove the hydrophilicity of the starch. It is desirable to. Preferred examples of the modified starch are preferably obtained by grinding one or more grains selected from the group consisting of rice starch, corn starch, tapioca starch, sweet potato starch, potato starch and wheat starch. The grains are low in cost, easy to process, and may exhibit excellent physical properties when applied to the eco-friendly coating composition of the present invention.

The modified starch is preferably in the range of 2 to 15% by weight based on the total weight of the total composition. When the modified starch is less than 2% by weight based on the total weight of the total composition, the effect of improving tacky is insignificant, whereas when the modified starch is more than 15% by weight, the viscosity is too high so that the composition cannot maintain a sol form. There is a problem.

The total weight of the inorganic filler and modified starch is preferably in the range of 20 to 70% by weight based on the total weight of the total composition. If the content of the inorganic filler and modified starch is less than 20% by weight based on the total weight of the composition, the foaming is not uniform, resulting in poor printing and moldability and insignificant biodegradable effects. This is because there may be a problem that the form of the foam and the sol is difficult to maintain.

The plasticizer used in the present invention includes an epoxy emulsion, and the epoxy emulsion preferably contains 30% or more of a bisphenol-based or modified bisphenol-based epoxy resin having an epoxy equivalent weight (EEW) of 170 to 550. Epoxy resins of bisphenol-based or modified bisphenol-based epoxy resins all have an epoxy equivalent of 170 or more, and when the epoxy equivalent value exceeds 550, the molecular weight becomes too large to be in a solid state, making it difficult to emulsify.

In addition, the epoxy emulsion may include a small amount, for example, 0.5 to 1% by weight of an emulsifier in addition to the epoxy resin and water. As such an emulsifier, any substance known to be able to emulsify the mixture with the epoxy resin and water may be used without limitation.

The eco-friendly coating composition of the present invention preferably contains 1 to 20% by weight of an epoxy emulsion as a plasticizer. At this time, the content range of the epoxy emulsion refers to only the solid content, such as epoxy resin and emulsifier except water. If the content of the epoxy emulsion is less than 1% by weight, the effect as a plasticizer is insignificant, and if it exceeds 20% by weight, more tacky is left in the coating film than necessary to damage the machine even after it is stuck to the roll during molding or commercialized. There is a problem of weak physical properties.

In particular, the amount of modified starch used as a plasticizer and an epoxy emulsion used as a plasticizer in the present invention is suitable for 1: 1 to 1: 2, and when the amount of modified starch is added in excess, the viscosity rises more than necessary to reduce workability. May cause problems.

In addition, the eco-friendly coating composition of the present invention may further include at least one material selected from the group consisting of a humectant, a foaming agent, a colorant and an antifoaming agent. The wetting agent may be 3 to 10% by weight of glycerin, 1 to 10% by weight of isobutane or isopentane as a blowing agent, and 5 to 10% by weight of titanium dioxide or carbon as a colorant.

Water used as a diluent in the present invention contains 10 to 40% by weight. At this time, the water content range refers to the total content of water included in the eco-friendly coating composition of the present invention, including water derived from other components such as epoxy emulsion. The eco-friendly coating composition of the present invention is composed of a water-soluble material, water serves as a solvent. When the water is less than 10% by weight based on the total weight of the composition, the viscosity of the composition is too high, so that it is difficult to apply and the viscoelasticity is difficult to work, while when it exceeds 40% by weight, the viscosity is lowered and the sedimentability of the coating composition is increased and the physical properties are increased. Since this is not properly expressed, the water is preferably in the range of 10 to 40% by weight based on the total weight of the total composition.

Eco-friendly coating composition of the present invention contains an additive containing 0.1 to 1% by weight of silicon. The silicone introduced as the additive may be a modified silicone or a silicone polymer, and may act as an antifoaming agent. The antifoaming agent suppresses the generation of unnecessary bubbles and adjusts the effect of the blowing agent appropriately to improve the quality of the foamed wallpaper. Since the role and the amount of the modified silicone or silicone polymer as an antifoaming agent are well known to those skilled in the art to which the present invention pertains, detailed description will not be given herein.

In addition, the eco-friendly coating composition according to the present invention may further include other additives, small amounts of thickeners and pH adjusting agents known in the art.

Environment-friendly coating composition of the present invention as described above is used in building interior materials, can be applied to curtains, wallpaper, vertical or blinds.

The wallpaper may include a coating layer comprising a winch, an environmentally friendly coating composition for the building interior material formed on the winch, and a printing layer formed on the coating layer, wherein the vertical is a fabric and an environment-friendly environment for the building interior material formed on the fabric. Coating layer comprising a coating composition, it may include a printed layer formed on the coating layer. In this case, the fabric of the vertical may be a polyester fabric or a blend fabric of polyester and cotton, the remaining configuration except the coating layer is in accordance with the conventional configuration of the wallpaper or vertical.

Hereinafter, the configuration and effects of the present invention will be described in more detail with reference to specific examples and comparative examples in order to help understanding of the present invention. However, the following examples are only intended to more clearly understand the present invention, and are not limited to the following examples of the present invention.

[Examples and Comparative Examples]

Example

35 wt% EVA 50% aqueous solution with binder, 20 wt% calcium carbonate with inorganic filler, octyyl succinic anhydride (OSA) with corn starch with organic filler, followed by secondary reaction of Al ³⁺ 10% by weight of modified starch prepared by the method of removing hydrophilicity, 70% aqueous solution by plasticizer and 8% by weight of bisphenol-based epoxy emulsion having epoxy equivalent of 300, 5% by weight of glycerin as wetting agent, and 4% by weight of isobutane in capsule form as blowing agent 5 wt% of titanium oxide as a colorant, 12 wt% of water as a diluent, 0.5 wt% of a silicone antifoaming agent as a additive, and 0.5 wt% of a urethane associative thickener were added to the mixer, followed by stirring at room temperature to prepare an environmentally friendly coating composition.

The eco-friendly coating composition was applied to the base paper and foamed at 150-160 ° C. After the molding process was formed between 180-200 ° C the packaged product was used as a sample. The physical properties of these samples were measured by methods known in KSM 7305: 2002 and EN 71 PART3: 1994 / A1: 2000, and the measurement results are shown in Tables 1 and 2 below.

Test Items unit Test result Reference value Test Methods
Wetting
The tensile strength horizontal
N / 1.5cm
(Kgf / 15mm) 9.43
(0.961)

1.96 or more





KSM 7305: 2002

Vertical 35.3
(3.60)
friction
Fastness


Dry horizontal

class


4-5

4 or more Vertical 4-5 Wet
horizontal 4-5 Vertical 4-5 Light fastness class 4 4 or more Concealability class 4 3 or more TVOCs mg / ㎡ Not detected 2 or less Headspace method
(100 DEG C, 1 hour)

Test Items unit Test result Reference value Test Methods Pb (lead)


mg / kg Less than 5 90

EN 71
PART3: 1994 /
A1: 2000 Cd (Cadmium) Less than 5 75 Cr (chrome) Less than 2 60 Ba (barium) 38 1,000 Sb (antimony) Less than 5 60 As (arsenic) Less than 2 25 Hg (mercury) Less than 2 60 Se (Serenium) Less than 2 500 Formaldehyde mg / L Non-detection
(Detection limit 0.1) KS M 7305: 2002

* The above results are from Korea Living Environment Testing Institute.

Referring to Tables 1 and 2, it was confirmed that exhibiting excellent physical properties that can be preferably applied as a foam wallpaper, without using a PVC or phthalate-based plasticizer.

Comparative Example

A commercial PVC wallpaper product was purchased and applied as a comparative example. The use of phthalate-based plasticizers well-known as environmental hormone disturbance substances and their contents are compared and measured in the products of the Comparative Examples and Examples, and the results are shown in Table 3 below.

Test Items unit Results Test Methods Comparative example product Example DEHP mg / kg 499 Not detected US EPA 8270D (GC / MS) DINP mg / kg 161,000 Not detected US EPA 8270D (GC / MS)

 DEHP: Bis (2-ethylhexyl) phthalate, Detection limit: 5mg / kg

DINP: Diisononyl phthalate, Detection limit: 25mg / kg

* The above results are from Korea Chemical Testing Institute.

Referring to Table 3 above, commercially available Comparative Example products contained phthalate-based plasticizers, which are environmental hormone disturbances, in high content, but it was confirmed that these phthalate-based plasticizers were not included in the sample.

Claims (11)

An environmentally friendly coating composition for building interior materials comprising ethylene vinyl acetate (EVA) as a binder, an inorganic filler, a hydrophobic modified starch as an organic filler, an epoxy emulsion as a plasticizer, and water as a solvent. delete The method of claim 1, wherein the hydrophobic modified starch is coated with silicon or the starch is reacted with octylyl succinic anhydride (OSA) and then reacted with Al ³⁺ to react the hydrophilic properties of starch. Eco-friendly coating composition for building interior materials will be removed. The environmentally friendly coating composition of claim 1, wherein the epoxy emulsion comprises 30% or more of an epoxy resin of bisphenol-based or modified bisphenol-based epoxy equivalent weight (EEW) of 170 to 550. 3. The eco-friendly coating composition of claim 1, wherein the eco-friendly coating composition for building interior materials further comprises at least one material selected from the group consisting of a humectant, a foaming agent, a colorant, and an antifoaming agent. The method of claim 5, wherein the inorganic filler is at least one selected from the group consisting of calcium carbonate, aluminum hydroxide, magnesium oxide and titanium dioxide, the blowing agent is isopentane or isobutane, the coloring agent is titanium dioxide or carbon, the antifoaming agent is modified silicone Or silicone polymers. delete The coating composition of claim 1, wherein the total weight of the inorganic filler and modified starch is in the range of 20 to 70% by weight based on the total weight of the total composition. The environmentally friendly coating composition of claim 1, wherein the building interior material is a curtain, wallpaper, vertical or blind. A wallpaper comprising a winch, a coating layer comprising an environmentally friendly coating composition for building interior materials of claim 1 formed on the winch, and a printing layer formed on the coating layer. Vertical coating comprising a fabric, a coating layer comprising an environmentally friendly coating composition for building interior materials of claim 1 formed on the fabric, a printing layer formed on the coating layer.