KR101495534B1 - Water-based adhesives for polypropylene - Google Patents

Abstract

The present invention relates to an aqueous adhesive for polypropylene and, more specifically, to an aqueous adhesive for polypropylene, useful for bonding a polypropylene base material and the like made up of nonpolar substances. The aqueous adhesive for polypropylene of the present invention comprises 0.5-1.5 wt% of 2-hydroxyethyl methacrylate (HEMA), 25-60 wt% of styrene butadiene rubber (SBR)-latex, 26-61 wt% of modified polyolefin, 13-47 wt% of aqueous polyurethane resins and the remainder additives.

Description

[0001] Water-based adhesives for polypropylene [

The present invention relates to a water-soluble adhesive for polypropylene, and more particularly to a water-soluble adhesive for polypropylene useful for bonding a polypropylene base or the like made of a non-polar material.

In general, adhesives for interior use are mainly organic solvent-based adhesives such as chloroprene rubber, natural wood, SBR, rubber-based polymers as base materials, and organic solvents such as benzene, toluene, xylene and ethyl acetate as solvents for dissolving these materials Respectively.

However, these organic solvents are harmful to the human body. As a result, harmful gas is generated during the application of the adhesive agent, thereby causing environmental problems such as causing hallucinations to the operator. In addition, when the consumers purchase a new car, And therefore, the manufacturing process itself is required to have a more friendly environment.

Generally, the adhesive using a water-soluble emulsion resin has a disadvantage in that the drying speed is lower than that of a product using an organic solvent. However, since the molecular weight is very high due to the characteristics of the synthetic mechanism, the physical properties of the product to be formed can be improved, The resin produced by using is formed into a nanoparticle form and dispersed in the water phase.

Therefore, there is a possibility that an environmentally friendly adhesive manufacturing process using a water-borne coating technique having a high solid content and low viscosity can be developed.

Korean Patent Laid-Open Publication No. 10-2012-0082550 discloses a water-soluble acrylic emulsion type adhesive and a method for producing the same. This adhesive is composed of AAEM (Accetoacetoxyethyl methacrylate), an oxidation and reduction catalyst, and SBR (Styrene Butadiene Rubber) -Latex, NBR (Nitrile-butadiene rubber) -Latex and CR And a latex selected from the group consisting of chloroprolene rubber-latex.

However, when synthetic fibers or synthetic resin sheets, especially the same polypropylene type fibers or sheets, are bonded to the polypropylene injection-molded product, there is a problem that the adhesive strength is lowered due to the property of polypropylene made of a non-polar material.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a polypropylene base material made of a nonpolar material by synthesizing an adhesive having a strong adhesive in the molecule to provide an environmentally- There is a purpose to provide.

The object of the present invention is to provide a water-soluble adhesive composition comprising 100% by weight of a water-soluble adhesive comprising 0.5 to 1.5% by weight of 2-HEMA (Hydroxyethyl methacrylate), 25 to 60% by weight of SBR (Styrene Butadiene Rubber) And a water-soluble adhesive for polypropylene comprising% 61 to 61 weight% modified polyolefin and 13 weight% to 47 weight% water-soluble polyurethane resin and remaining weight% additive.

Therefore, the water-soluble adhesive for polypropylene of the present invention has the effect of exhibiting fast drying property while maintaining a high adhesive strength when a sheet or fiber of the same type is adhered to a polypropylene injection-molded article.

Further, the present invention is eco-friendly as an aqueous emulsion type adhesive.

FIG. 1 is a graph showing the measurement results of Examples and Comparative Examples according to the present invention. FIG.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

Hereinafter, preferred embodiments of the present invention will be described in detail.

The water-soluble adhesive for polypropylene of the present invention comprises 0.5 to 1.5% by weight of 2-HEMA (Hydroxyethyl methacrylate), 25 to 60% by weight of SBR (Styrene Butadiene Rubber) latex and 26 to 61% Modified polyolefin, 13% to 47% by weight of a water-soluble polyurethane resin, and the remaining weight% of additives.

2-HEMA (Hydroxyethyl methacrylate) is a material having an acrylate and a hydroxyl group.

The water-soluble adhesive for polypropylene according to the present invention comprises a water-soluble polyurethane resin, and has a water-soluble SBR (Styrene Butadiene Rubber) -Latex and a modified polyolefin as a matrix, It contains 2-HEMA (Hydroxyethyl methacrylate), a polar monomer that improves adhesion.

Additives accounting for the remaining weight% include at least one selected from the group consisting of surfactants, antifoaming agents, initiators, bleaching agents, acidity adjusting agents, metal oxide (AOC) catalysts, pigments, and viscosity agents.

When the amount of 2-HEMA (Hydroxyethyl methacrylate), SBR (Styrene Butadiene Rubber) -Latex and modified polyolefin is 100% by weight in the water-soluble adhesive for polypropylene, the additive is not contained, The additive is contained in an amount as low as 100 wt%.

The surfactant may be any one or more of polyoxyethylene nonylphenyl ether or sodium dodecylbenzenesulfonate. The initiator may be any one of APS (Ammonium Persulfate) or TBHPO (Tereric butyl hydroperoxide) (2-AMINO-2-METHYL-1-PROPANOL) is used as the acidity regulator, and the bleaching agent is made of Rongalite (sodium formaldehyde sulfoxylate).

Examples and comparative examples of the water-soluble adhesive according to the present invention. The following Examples 1 and 2 are water-soluble adhesives for polypropylene comprising 2-HEMA (Hydroxyethyl methacrylate) and SBR (Styrene Butadiene Rubber) -Latex, modified polyolefin and water-soluble polyurethane resin, Comparative Examples 1 and 2 are comparative examples of a water-soluble adhesive composition obtained from 2-HEMA (Hydroxyethyl methacrylate) and SBR (Styrene Butadiene Rubber) -Latex and modified polyolefin except for Aqueous polyurethane resin . Experimental examples and comparative examples were conducted in order to compare a water-soluble adhesive to which a water-soluble polyurethane resin was added and a water-soluble adhesive to which a water-soluble polyurethane resin was not added.

The following examples and comparative examples are provided only for illustrating the present invention. The present invention is not limited to the following examples and comparative examples, and it is possible to substitute and equivalent other examples within the scope of the present invention And comparative example will be apparent to those skilled in the art to which the present invention pertains.

≪ Example 1 >

In a 100 wt% water-soluble adhesive, 40 wt% of SBR-latex is added to a 5-spherical flask, and the temperature is raised and maintained at 78 캜 in the presence of nitrogen. (SBR-latex 40% by weight + 2-HEMA) containing 4.18% by weight of initiator APS (Ammonium Persulfate) and SBR-g- (2-HEMA) 1% by weight * 0.01% by weight), and 1% by weight of 2-HEMA was added dropwise for 2 hours. The mixture was kept for 1 hour and then stirred at a stirring speed of 365 rpm Continue the reaction. The resulting SBR-g- (2-HEMA) was stored at room temperature and then cooled to room temperature. To the mixture, 41.41 wt% of the modified polyolefin and 13 wt% of the water-soluble polyurethane resin, which were the same amount as the amount of SBR- The mixture was placed in a dropping manner at a stirring speed of 365 rpm for 10 minutes, and the reaction was maintained for 15 minutes to obtain a water-soluble adhesive composition.

≪ Example 2 >

In a 100 wt% water-soluble adhesive, 25 wt% of SBR-latex is added to a 5-spheres flask, and the temperature is raised and maintained at 78 캜 in the presence of nitrogen. (SBR-latex 25% by weight + 2-HEMA) containing 0.48% by weight of initiator APS (Ammonium Persulfate) and SBR-g- (2-HEMA) 1% by weight * 0.01% by weight), and 1% by weight of 2-HEMA was added dropwise for 2 hours. The mixture was kept for 1 hour and then stirred at a stirring speed of 365 rpm Continue the reaction. The resulting SBR-g- (2-HEMA) was stored at room temperature and cooled to room temperature. 26.26% by weight of the modified polyolefin and 47% by weight of the water-soluble polyurethane resin, which were the same amount as that of the prepared SBR-g- The mixture was placed in a dropping manner at a stirring speed of 365 rpm for 10 minutes, and the reaction was maintained for 15 minutes to obtain a water-soluble adhesive composition.

≪ Comparative Example 1 &

In a 100 wt% water-soluble adhesive, 40 wt% of SBR-latex is added to a 5-spherical flask, and the temperature is raised and maintained at 78 캜 in the presence of nitrogen. (SBR-latex 46% by weight + 2-HEMA) containing 17.18% by weight of initiator APS (Ammonium Persulfate) and stirring SBR-g- 1% by weight * 0.01% by weight), and 1% by weight of 2-HEMA was added dropwise for 2 hours. The mixture was kept for 1 hour and then stirred at a stirring speed of 365 rpm Continue the reaction. The resulting SBR-g- (2-HEMA) was stored at room temperature, cooled to room temperature, and 41.41 wt% of the modified polyolefin, which was the same amount as that of the prepared SBR-g- (2-HEMA), was stirred at a stirring rate of 365 rpm for 10 minutes And the reaction was maintained for 15 minutes to obtain a water-soluble adhesive composition.

≪ Comparative Example 2 &

In a 100 wt% water-soluble adhesive, 46 wt% of SBR-latex was added to a 5-spheres flask, and the temperature was raised and maintained at 78 DEG C in the presence of nitrogen. The SBR-g- (2-HEMA) obtained by adding 5.06% by weight of initiator APS (Ammonium Persulfate) and stirring SBR-latex and 2-HEMA was mixed with 0.47% by weight (SBR- latex 46% by weight + 2-HEMA 1% by weight * 0.01% by weight), and 1% by weight of 2-HEMA was added dropwise for 2 hours. The mixture was kept for 1 hour and then stirred at a stirring speed of 365 rpm Continue the reaction. The resulting SBR-g- (2-HEMA) was stored at room temperature and then cooled to room temperature. 47.47% by weight of the modified polyolefin, which was the same amount as that of the prepared SBR-g- (2-HEMA), was stirred at a stirring rate of 365 rpm for 10 minutes And the reaction was maintained for 15 minutes to obtain a water-soluble adhesive composition.

For 100 wt% water soluble adhesives, the weight percentages of the ingredients added to Examples 1 and 2 and Comparative Examples 1 and 2 are reported in Table 1.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 SBR-latex (% by weight) 40.4 25.25 40.4 46.46 2-HEMA (wt%) 1.01 1.01 1.01 1.01 Modified polyolefin (% by weight) 41.41 26.26 41.41 47.47 Water-soluble polyurethane resin (% by weight) 13 47 0 0 Initiator APS (wt.%) 4.18 0.48 17.18 5.06 Total (wt%) 100 100 100 100

The adhesive strength test was carried out with the sample according to Table 1.

≪ Bond Strength Test &

The adhesive strength shows the strength when the adhesive joint is broken by applying tensile stress to one or both ends of the contact surface. In this test, the quick-dry test to see how fast the adhesive strength is performed and the adhesive strength exhibited after a certain time And a continuity test was carried out to see whether the adhesive force was exerted.

<Test Method>

Universal testing machine (UTM), test adhesive, and adhesive spray gun were used as test equipment.

The used adhesive was a polypropylene quadrangular molded product (thickness: 3 mm, width: 45 mm, area: 4005 mm) and leather. The samples used were the adhesives of Examples 1 and 2 and Comparative Examples 1 and 2 .

The concrete experimental method is as follows.

The tester was designed so that the breaking load corresponds to 15 ~ 85% of the capacity of the tensile tester and the tolerance is within ± 1% of the standard load. The load was applied at a speed of 0.8 ~ 1.0 kN / min, or at a speed corresponding to the load of the crosshead moving at 0.8 ~ 1.0 kN / min, and the tensile shear bond strength when the bond was broken was measured .

The specimens were stored in an environment capable of maintaining a temperature of 23 ± 2 ° C and a relative humidity of 50 ± 5% for at least 24 hours before bonding strength measurement. The treated specimens were subjected to tensile shear bond strength measurements in an environment capable of maintaining a temperature of 23 ± 2 ° C and a relative humidity of 50 ± 5%. The specimens were clamped at the bite of the tester with the support, and the long axis of the specimen and the center line of the bite were straight, and the load was properly passed through the bite, so that the tensile speed of 784 ~ 980 N / min ] And the maximum load until the specimen was destroyed was recorded.

The tensile shear bond strength was expressed as the shear load per unit area (kgf / 2.5 cm) calculated to the second decimal place.

Table 2 shows the measurement results of Examples 1 and 2 and Comparative Examples 1 and 2.

1 is a graph showing the measurement results of Examples 1 and 2 and Comparative Examples 1 and 2 according to the present invention.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Average value [kgf / 2.5 cm] 3.34 3.71 2.48 2.91 Maximum value [kgf / 2.5cm] 4.44 4.17 8.81 8.43 Minimum value [kgf / 2.5cm] 0.53 1.41 1.03 1.80

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Various changes and modifications will be possible.

Claims (6)

In a water-soluble adhesive of 100% by weight,
0.5% to 1.5% by weight of 2-HEMA (Hydroxyethyl methacrylate);
25% to 60% by weight of SBR (Styrene Butadiene Rubber) -Latex;
26% to 61% by weight modified polyolefin;
13% to 47% by weight of a water-soluble polyurethane resin; And
The remaining weight percent additive
Soluble adhesive for polypropylene.
The method according to claim 1,
Wherein the additive comprises at least one selected from the group consisting of a surfactant, an antifoaming agent, an initiator, a bleaching agent, an acidity adjusting agent, a metal oxide (AOC) catalyst, a pigment, or an intermediate agent.
3. The method of claim 2,
Wherein the surfactant is any one of polyoxyethylene nonylphenyl ether and sodium dodecylbenzenesulfonate.
3. The method of claim 2,
Wherein the initiator is any one of APS (Ammonium Persulfate) or TBHPO (Tereric butyl hydroperoxide).
3. The method of claim 2,
Wherein the bleaching agent is Rongalite (sodium formaldehyde sulfoxylate).
3. The method of claim 2,
Wherein the acidity regulator is amino-methyl-propanol (2-AMINO-2-METHYL-1-PROPANOL).

Images