KR100297493B1 - Water Soluble Adhesive Composition - Google Patents

Abstract

A water-soluble adhesive composition for bonding floorings, the composition comprising 10 to 60% by weight of acrylic-epoxy resin, 5 to 75% by weight of tackifier, 14 to 80% by weight of filler and 0.1 to 15% by weight of additive. In addition, the adhesive composition may include an acrylic-urethane resin instead of an acrylic-epoxy resin, or may further include an acrylic-urethane resin.

The adhesive composition can be used in various ways to adhere floorings to floors in homes and commercial buildings, and has excellent adhesion, heat resistance, water resistance and alkali resistance. In addition, this adhesive composition has little change in dimensional of the flooring when used for the flooring and has excellent initial adhesive force.

Description

Water Soluble Adhesive Composition for Flooring

[Industrial use]

The present invention relates to a water-soluble adhesive composition for bonding floorings, and more particularly, to a water-soluble adhesive composition for bonding floorings having excellent adhesion and physical properties.

[Prior art]

The construction of various flooring materials such as PVC flooring, parquet flooring, cork tiles, and carpet tiles in homes and commercial buildings is carried out using adhesives on concrete floors. Attach. The adhesive used at this time should not only have excellent adhesive force for adhering the adherend to the flooring material, but also be resistant to moisture and alkali and also to heat. In addition, it should have firmness and weather resistance to adhesion between the adhered layer and the flooring material. In addition, since the dimensional change of the flooring is sensitive, the dimensional change of the attached flooring should be less generated by the repeatability of heating and cooling.

Conventionally, two-component resins such as epoxy resins and polyurethane resins have been used as adhesives having such physical properties. However, in order to use this two-component resin, a strong solvent must be used in the work, which causes toxic odors and environmental pollution problems. In addition, due to the use of such a two-component adhesive, the mixing ratio is not made quantitatively when used in the field, there are problems such as changes in the curing time, there is a difficulty in working.

In addition, the moisture curing polyurethane causes the -NCO group of the urethane to bond with moisture to promote hardening, so that the product, once opened, causes drawbacks and storage problems. In addition, when using a curable epoxy or urethane resin, it is difficult to reconstruct when it is necessary to reconstruct due to poor adhesion after construction because of the fast curing speed due to the curing agent. In addition, the flooring is broken and it is difficult to replace the flooring newly.

In order to solve this problem, in recent years, the use of water-soluble adhesives are emerging, but in the case of water-soluble and one-component type, thermoplastic resins such as polystyrene, polyethylene, and polyamide are contained, and these thermoplastic resins are used for initial adhesion. Should be used more. Due to the thermoplastic resin, the adhesive prepared has a problem in that water resistance, alkali resistance, heat resistance, and the like are weak.

The present invention is to solve the above problems, it is an object of the present invention to provide a water-soluble adhesive composition for adhesion of the flooring material excellent in water resistance, alkali resistance and heat resistance.

Another object of the present invention is to provide a water-soluble adhesive composition for adhesion of the flooring material having excellent adhesion.

[Means for solving the problem]

In order to achieve the above object, the present invention is 10-80% by weight of acrylic-epoxy resin or 10-80% by weight of acrylic-urethane; Tackifier 5 to 75 wt%; It provides a water-soluble adhesive for flooring adhesive comprising 14 to 80% by weight filler and 0.1 to 15% by weight additives.

The adhesive composition of the present invention may contain 10 to 80% by weight of acrylic-epoxy resin and 10 to 70% by weight of acrylic-urethane resin at the same time.

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

The water-soluble adhesive for bonding the flooring material of the present invention contains an acrylic-epoxy resin or an acrylic-urethane resin or a mixture thereof as a main component, and includes a tackifier, a filler, and an additive as a secondary component.

The acryl-epoxy resin and acryl-urethane resin are generally prepared by emulsion polymerization, which is mainly used to polymerize acrylic monomers, and a method of preparing acryl-epoxy resin is as follows. The epoxy resin is dissolved in an acrylic monomer and the mixture is added to water in which an emulsifier is dissolved to prepare an emulsion. In the process of manufacturing the said acryl-epoxy composition, the ratio of a water-insoluble epoxy resin and an acryl monomer is 2-100-100: 100. When the ratio of the epoxy resin to the acrylic monomer is less than 2/100, sufficient crosslinking effect cannot be obtained. Also, when the ratio of the epoxy resin to the acrylic monomer is larger than 50/100, the stability of the resulting emulsion is lowered and the epoxy resin remains after the reaction to form a film film. When the desired adhesion can not be obtained.

An initiator is added to the emulsion to prepare an acrylic-epoxy resin. In the present invention, butyl acrylate, ethyl acrylate, methyl methacrylate, methacrylic acid, dimethylamino ethyl methacrylate, divinyl benzene and the like can be used as the acrylic monomer. As a reaction initiator for initiating the polymerization reaction, any compound that may cause emulsion polymerization may be used, and a redox initiator may be mainly used. Representative examples of such redox initiators include potassium persulfate (K ₂ S ₂ O ₈ ) and peroxide-Fe (II) salts. Emulsifiers emulsify monomers and reaction initiators that do not mix with surfactants having both hydrophobic and hydrophilic groups to allow polymerization to occur. As emulsifiers that play such a role, nonionic and anionic surfactants are used, and representative examples thereof include soaps, which are higher fatty acid salts.

The complex emulsion of acryl-epoxy and acryl-urethane of the present invention is an acrylic containing an amino radical by reacting a seal portion with an epoxy radical by containing an epoxy resin by utilizing the characteristic that the polymer is in a particulate state. Epoxy self-crosslinking complex emulsions are obtained. This emulsion zone forms a film property as shown below, and the following coupling reaction takes place. That is, a general thermoplastic resin forms a chain structure and does not form a network structure, whereas the adhesive composition of the present invention forms a network structure and thus has excellent robustness after adhesion.

Due to this structure, it is not only excellent in adhesion to the concrete surface, but also excellent in corrosion resistance, water resistance, and solvent resistance.

Such a self-crosslinking complex emulsion may induce self-reaction when forming a film film, may not only have the characteristics of epoxy or urethane resin, but also may improve the adhesive strength by supplementing disadvantages of the water-soluble thermoplastic resin.

The adhesive composition of the present invention further contains 5 to 75% by weight of a tackifier with the above-mentioned acrylic-epoxy resin, acrylic-urethane resin or mixtures thereof for the purpose of improving initial adhesion and increasing pot life. As the tackifier, any resin capable of satisfying the above-mentioned object can be used. However, the resin used as a tackifier is a resin having a low molecular weight has a low drying and a resin having a high molecular weight has a poor water dispersibility or a quick drying, so the adhesive state is very different depending on the degree of their mixing, so the selection of the adhesive resin is also an important factor. Becomes In the present invention, a natural resin and a synthetic resin were mixed and used as the tackifier, and the amount thereof was used in an amount of 20 to 50 wt% of the natural resin and 5 to 25 wt% of the synthetic resin. The natural resin may be any resin used as a tackifier among the resins present naturally, but representative examples thereof may include ester rosin such as ester gum, hydrogenated rosin, and high acid rosin. have. In addition, the synthetic resin may be used any resin that can be used as a tackifier, for example, a petro resin, a petroleum resin and a terpene resin (terpene resin) may be used. The tackifier is added by dissolving in a solvent, which causes discoloration of the phenol adhesive used in the manufacture of flooring materials such as floorboards or color deformation of the PVC product. To prevent this color change, a low boiling solvent must be used to prevent penetration into the flooring.

The adhesive composition of the present invention further comprises a filler to increase physical properties such as dimensional stability and heat resistance, the amount of which is 14 to 80% by weight based on the total composition weight. As the filler, any compound can be used as long as this object can be achieved. Representative examples thereof include CaCO ₃ and clay. In addition, the adhesive composition of the present invention further comprises additives such as dispersants, antifoaming agents and leveling agents, the amount of which is 0.1 to 15% by weight based on the total weight of the composition. The adhesive composition of the present invention may also further comprise a catalyst.

The adhesive composition of the present invention comprising such a component is the same as the method for preparing a conventional general adhesive composition, and the method is briefly described below.

The filler is added to the acrylic-epoxy resin and then mixed. A tackifier is added to this mixture, and the additive is added after determining the degree of dispersion of the filler. Subsequently, after confirming the viscosity of the product, the adhesive composition is prepared by adjusting to a desired viscosity using a viscosity modifier such as milk casein.

EXAMPLE

Hereinafter, preferred examples and comparative examples of the present invention are described. However, the following examples are only preferred embodiments of the present invention and the present invention is not limited to the following examples.

(Example 1)

100 parts by weight of CaCO ₃ and 30 parts by weight of clay were added to 180 parts by weight of DR-500 (50%), an acrylic epoxy resin, followed by high speed mixing for 30 minutes. 20 weight part of hydrogenated rosin which is a tackifier, and 20 weight part of petroleum resin were added to this mixture. Subsequently, after determining the dispersion degree of the filler, the additive was added, the viscosity was confirmed, and the final viscosity was adjusted with milk casein. At this time, stable paste-like adhesives having a viscosity of 80,000 to 90,000 and pH 6.5 were prepared.

(Example 2)

An acrylic-urethane resin, DU-2,000, was used in place of the acrylic-epoxy resin, and was substantially the same as in Example 1 except that the type of the tackifier was changed as shown in Table 1 below.

(Example 3-4)

The acrylic-urethane resin was further used, and the same operation as in Example 1 was carried out except that the type of the tackifier was changed as shown in Table 1 below.

(Comparative Example 1-3)

60 parts by weight of styrene-butadiene rubber latex was added to 120 parts by weight of the acrylic latex, which is a water-soluble resin, and 0.5% by weight of ZnO was added for SBR latex crosslinking, followed by mixing well. 105 parts by weight of CaCO ₃ and 25 parts by weight of clay were added to the mixture, followed by high speed mixing for 30 minutes. Thereafter, 20 wt% of a natural resin as a tackifier and 20 wt% of an ester resin were added, and then, additives were added after determining the degree of dispersion of the filler. After checking the viscosity, the final viscosity was adjusted with milk casein. At this time, the paste adhesive of viscosity 50,000cps-60,000cps pH 8.5 was obtained.

(Comparative Example 2-3)

An adhesive was prepared in the same manner as in Comparative Example 1 except that the water-soluble resin and the tackifier were changed as shown in Table 1 below.

The pH and viscosity of the adhesive prepared by the method of Examples 1-4 and Comparative Examples 1-3 are shown in Table 1 below. In Table 1 below, the EVA emulsion is an emulsion of ethylenevinylacetate copolymer, PVAC. E represents a polyvinylacetate emulsion. In addition, the content unit of each component shown in following Table 1 is a weight part.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 DR-500DU-2,000SBR Latex EVA Emulsion Acrylate PVAC E. 180 180 12060 100100 60120 208080 6010020 Natural resin Hydrogenated resin Ester gumterpene resin Petro resin 2020 2020 102010 101020 2020 2020 2020 CaCO ₃ Clay ZnO 10030 10030 10030 10030 105250.5 130 10525 additive 3.0 3.0 3.0 3.0 3.0 3.0 3.0 pH 6.5 6.5 6.5 6.5 8.5 5 5 Viscosity (CPS) 8-90,000 6-70,000 6-70,000 7-80,000 5 to 60,000 80,000 5 to 60,000

By the following method of the adhesive prepared according to the method of Examples 1 to 7 above, room temperature adhesive strength, flooring dimensional change, flowability, workability and initial adhesive strength were measured.

1) Adhesion Test

Referring to the adhesion test shown in Table 1 below.

The state adhesive strength is for measuring problems of adhesion state weather resistance at room temperature after adhesion, and measuring adhesion change and shape of one to five days after adhesion. Heat resistance adhesive strength is measured to see how much the adhesive force is reduced due to shrinkage expansion of the flooring due to temperature. Low Temperature Adhesion Also, heat resistance determines the change in adhesion due to breakage and deformation of the adhesive at low temperatures. Water Resistance Adhesion measures how adhesion changes due to moisture and submersion on the floor. Alkali adhesion strength is bonded to the concrete surface and then decomposed by alkali to determine how the adhesion force changes. The test method of the adhesion test measured for this purpose is shown in Table 2 below.

In the present invention, as shown below, after coating a certain amount of the adhesive prepared in the method of Example 1-7 on the slate plate and contact with the plywood solids and left in the conditions shown in Table 2 below, the adhesive strength at room temperature with Instron Measured. The adhesive coating amount is 0.28 / EA (each) (640 g / m 3).

NO Item Test Methods Remarks One Room temperature After adhesion, leave at room temperature (3 days) Instron Check 2 Heat adhesion 5 days left after bonding ▶ 80 ℃ × 1 day ▶ After 30 minutes Instron Check 3 Low temperature adhesion After adhesion, leave at room temperature for 5 days ▶ 5 ℃ × 1 day ▶ After 30 minutes at room temperature Instron Check 4 Water resistance After adhesion, leave for 5 days at room temperature ▶ Room temperature × 1 day ▶ Check the adhesion strength after leaving for 30 minutes at room temperature Instron Verification Moisture Removal 5 Alkali adhesion After adhesion, stand at room temperature for 5 days ▶ NaOH 5% water × 1 stand: ▶ Check adhesion after 30 minutes at room temperature Instron Verification Removal

2) Floor material dimension change

Since the dimensional change of the flooring material is caused by the change of temperature, if the dimensional change is made severely after the adhesion, a large problem arises that the construction is conflicted with the gap or upward due to the collision of the joint site. Therefore, this problem should be reduced to a large extent by the adhesive force of the adhesive, so the change according to the temperature change of the adhesive should be minimized, and therefore, this measurement after the adhesion of the adhesive is made.

Dimensional change of this flooring can be measured by the method shown in Table 3 below. In the present invention, by using the adhesive prepared by the method of Example 1 to Example 7, the dimensional change of the flooring material was measured by the method using a wooden barupan as a flooring material in the method shown in Table 3 below.

Kinds standard Test Methods Remarks Parquet 100m / m × 90m / m 95% humidity at 45 ℃ 0.1% or less 4 hours at room temperature, 4 hours at room temperature 0.2% or less PVC flooring 450m / m × 450m / m 4 hours at room temperature and 4 hours at room temperature 0.25% or less

3) flowability, workability and initial adhesion

In view of the importance of workability, the flow of adhesive is measured by applying or decreasing the force of worker when applying adhesive with hera. In addition, since the workability is maximized when the adhesive is formed by applying the adhesive to the spatula and the spreadability is maximized, the bone formation degree is measured. In addition, since the initial adhesive force does not give a pressure after the adhesion of the flooring is made, this should be measured from the beginning to the force holding the adherend and the flooring.

For this purpose, the flowability, workability and initial adhesion of the adhesive prepared by the method of Examples 1 to 7 were measured by the method shown in Table 4 below.

Item Test Methods Flow 2g of adhesive is added to drawing paper, and it is set at 90 ℃ and left for 2 minutes to measure the flow length Workability Comparison of the degree of bone formation in natural drying for 2 hours after applying adhesive with HERA Initial Adhesion After opening time, there should be no floating of PVC flooring even after 1 hour of adhesion with adhesive

The adhesive prepared by the method of Example 1-4 and Comparative Examples 1-3 was measured in the above-described method, the adhesive force, the flooring dimensional change, the flowability, workability and initial adhesive strength and the results are shown in Table 5 below. In addition, the heat resistance, water resistance, alkali resistance and the change of the adhesive agent and the bottom surface up to 72 hours when the adhesive was measured and the results are shown in Table 5 below.

Item Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Room temperature adhesion (㎏ / ㎠) 17.1 18.7 19.8 18.9 15.6 12.4 11.5 Heat resistance 18.8 20.5 21.6 20.8 16.4 13.2 13.8 Water resistance 15.7 15.1 16.9 15.9 5.8 3.9 2.6 Alkali resistance 15.3 16.3 16.2 16 6.3 2.7 1.8 Change up to 72 hours [㎏ / ㎠] 24 hours 12.7 14.1 14.3 13.9 6.38 5.92 5.2 48 hours 16.9 15.7 18.8 17.3 12.42 9.2 7.8 72 hours 17.1 18.7 19.8 18.9 15.6 12.4 11.5 Change in dimensions (per shrinkage area) 0.01 0.01 0.01 0.01 0.02 0.01 0.03 Initial adhesion ○ ◎ ◎ ◎ ◎ ○ ○ Bone formation ◎ △ ○ ◎ ○ ○ △

(× Very bad △ Bad ○ Good ◎ Very good)

As shown in Table 5, the adhesive of the Example is superior to the general adhesive properties, such as room temperature adhesive strength, heat resistance, water resistance, alkali resistance compared to the adhesive strength of the comparative example. Moreover, when using the adhesive agent of an Example for a flooring material, it turns out that there is little change in the dimension of a flooring material compared with using the adhesive agent of a comparative example. In addition, it can be seen that the effect is better to use a mixture than to use an acrylic-epoxy resin or acrylic-urethane resin alone.

As described above, the adhesive of the present invention is an adhesive that can be used in various ways to adhere the flooring to the floor in homes and commercial buildings, it is excellent in adhesion, heat resistance, water resistance and alkali resistance. In addition, the adhesive of the present invention has almost no dimensional change of the flooring when used for the flooring material and has excellent initial adhesive force.

Claims (3)

10 to 80% by weight of acrylic-epoxy resin; Tackifier 5-75 wt%; 14 to 80 wt% filler; And 0.1-15% by weight of an additive; Water-soluble adhesive composition for bonding the floor covering comprising a. The water-soluble adhesive composition of claim 1, wherein the adhesive composition further comprises 10 to 70 wt% of an acrylic urethane resin based on the weight of the entire composition. The water-soluble adhesive composition of claim 1, wherein the tackifier comprises 20 to 50 wt% of a natural resin and 5 to 25 wt% of a synthetic resin.