KR20100068560A - Adhesive composition for panel using acrylic resin - Google Patents

Abstract

PURPOSE: An adhesive composition for a panel is provided to prevent environmental contamination using an environment-friendly acrylic resin, to obtain excellent adhesive force to the panel and high corrosion resistance, and to improve abrasion resistance and soundproof effect due to buffer action of a cell. CONSTITUTION: An adhesive composition for a panel using an acrylic resin comprises; 25 ~ 35 weight% of the acrylic resin which is selected from a polymer or copolymer of methyl acrylate, methyl methacrylate, ethylacrylate, n-butyl acrylate, t-butyl acrylate, and hexyl acrylate; 20 ~ 30 weight% of a plasticizer; 5 ~ 15 weight% of tackifier; 20 ~ 30 weight% of filler which is selected from calcium carbonate, talc, silica, and clay which are surface-treated; 3 ~ 8 weight% of diluent; 1 ~ 5 weight% of hardener; 1 ~ 5 weight% of foaming agent; 1~ 5 weight% of hygroscopic agent; and 1 ~ 5 weight% of coloring agent.

Description

Panel adhesive composition using acrylic resin {ADHESIVE COMPOSITION FOR PANEL USING ACRYLIC RESIN}

The present invention is to apply a panel adhesive composition using an acrylic resin including an acrylic resin, a plasticizer, a tackifier, a filler, a diluent, a curing agent, a foaming agent, a hygroscopic agent and a colorant to the lower body panel, the resistance to corrosion and sound insulation effect Is an excellent and environmentally friendly composition.

Recently, environmental problems continue to emerge, and in the automotive industry, the tendency to use environmentally friendly products is rapidly progressing. In the past, a vehicle vinyl panel adhesive composition of polyvinyl chloride (PVC) -based type has been used. However, such a composition has a fatal adverse effect on the environment, such as the generation of dioxins (Dioxin) during the curing by the oven, one of the vehicle assembly process, and simply by coating the panel has a function such as adhesion to the panel and wear resistance There was no sound insulation and soundproofing effect on the noise generated during driving. In addition, there is a limit that does not have a good effect on the durability of the vehicle, such as corrosion problems due to the weak weather resistance due to aging from the external environment such as weather or natural light. In order to improve such a problem, research has been conducted to improve the physical properties of the panel adhesive composition by adding an additive of a specific content using an environmentally and functionally superior acrylic resin instead of a polyvinyl chloride-based resin.

Accordingly, the present inventors have made efforts in view of the above problems, and as a result, the acrylic resin, the plasticizer, the tackifier, the filler, the diluent, the curing agent, the foaming agent, the hygroscopic agent and the colorant are used in the panel when the vehicle is applied to a specific content. Adhesion is improved, resistance to corrosion is improved and a soundproofing effect is achieved.

Accordingly, an object of the present invention is to provide a panel adhesive composition using an acrylic resin that is environmentally friendly, has excellent adhesion and wear resistance, and has improved soundproofing and corrosion resistance.

Panel adhesive composition using the acrylic resin of the present invention for solving the above problems is a polymer of methyl acrylate, methyl methacrylate, ethyl acrylate, n-butyl acrylate, t- butyl acrylate, and hexyl acrylate or 25 to 35% by weight of at least one acrylic resin selected from the copolymer, 20 to 30% by weight plasticizer, 5 to 15% by weight tackifier, calcium carbonate, talc, silica and clay at least one surface treatment with a surface treatment agent Panel with acrylic resin comprising 20 to 30% by weight of filled filler, 3 to 8% by weight of diluent, 1 to 5% by weight of curing agent, 1 to 5% by weight of blowing agent, 1 to 5% by weight of absorbent and 1 to 5% by weight of colorant An adhesive composition is featured.

Panel adhesive composition using an acrylic resin according to the present invention has no environmental pollution problem by using an environmentally friendly acrylic resin, excellent adhesion to the panel, high resistance to corrosion, as well as cells formed due to foaming during curing ( cell) buffers to improve abrasion resistance and sound insulation effect, thereby improving the durability of the vehicle and the passengers can feel good ride and comfort when driving.

This invention will be described in more detail below.

The panel adhesive composition using the acrylic resin of the present invention is at least one selected from polymers or copolymers of methyl acrylate, methyl methacrylate, ethyl acrylate, n-butyl acrylate, t-butyl acrylate, and hexyl acrylate. 20 to 30% by weight of surface-treated filler with at least one selected from 25 to 35% by weight of acrylic resin, 20 to 30% by weight of plasticizer, 5 to 15% by weight of tackifier, calcium carbonate, talc, silica and clay , 3 to 8 wt% of a diluent, 1 to 5 wt% of a curing agent, 1 to 5 wt% of a blowing agent, 1 to 5 wt% of a hygroscopic agent, and 1 to 5 wt% of a colorant.

Hereinafter, the present invention will be described in detail.

The acrylic resin may be one or more selected from polymers or copolymers of methyl acrylate, methyl methacrylate, ethyl acrylate, n-butyl acrylate, t-butyl acrylate, and hexyl acrylate. It includes 25 to 35% by weight based on the total weight of the panel adhesive composition using. In this case, when the content of the acrylic resin is less than 25% by weight may be reduced in wear, and when the content of more than 35% by weight may cause a problem in that the spray property of the method of applying the composition to the automotive panel may be used within the above range. Good to do.

By using the acrylic resin described above, there is an environmentally friendly advantage over conventional polyvinyl chloride-based resins. In addition, the material itself is light, and even when the amount of acrylic composition is reduced for automobile panels, it can produce better adhesion and abrasion resistance than existing polyvinyl chloride-based products. It is effective, and excellent sound insulation and sound insulation effect can provide a quieter interior space for passengers by blocking the noise generated from the bottom of the vehicle running. In addition, the weather resistance from the external environment, such as chemical resistance, natural light, etc. is excellent, it is also effective in improving the long-term durability of the vehicle.

The plasticizer may use at least one selected from di-isononylphtalate (DIPD) and dioctylphthalate (DOP), and may include 20 to 30 wt% based on the total weight of the panel adhesive composition using an acrylic resin. do. Here, when the content of the plasticizer is less than 20% by weight, the plasticization of the acrylic resin is inadequate and the foaming rate and the mixing workability of the composition may be lowered. When the content of the plasticizer exceeds 30% by weight, the wearability is reduced due to excessive plasticization of the acrylic resin. The above range is preferable because a problem may occur.

The tackifier may be a block isocyarate resin, and includes 5 to 15 wt% of the total weight of the panel adhesive composition using an acrylic resin. When the content of the tackifier is less than 5% by weight, the wearability may be reduced due to the decrease in adhesive strength with the panel. When the content of the tackifier is more than 15% by weight, the spraying property may be considerably deteriorated. .

The filler may be used at least one selected from calcium carbonate, talc, silica and clay surface-treated with a surface treatment agent, and the surface treatment agent may be selected from aliphatic alcohols, fatty acids, fatty acid salts, aliphatic esters, phosphate esters and derivatives thereof. It is characterized by one or more. The filler has an effect of improving the compounding performance by surface treatment with the surface treatment agent as described above. Such a filler includes 20 to 30% by weight based on the total weight of the panel adhesive composition using an acrylic resin. When the amount of the filler used is less than 20% by weight, a flow phenomenon may occur, and volumetric formation may be difficult, and when the amount of the filler is used in excess of 30% by weight, a decrease in adhesion strength and specific gravity may be increased, and wearability may decrease.

The diluent may be used isoparaffin resin, and includes 3 to 8% by weight based on the total weight of the panel adhesive composition using an acrylic resin. If the diluent is used in less than 3% by weight may reduce the spraying property, when the diluent exceeds 8% by weight may cause a problem in the flow phenomenon may be used within the above range.

The curing agent may use adipic acid di-hydrazide (Di-hydrazide), and includes 1 to 5% by weight based on the total weight of the panel adhesive composition using an acrylic resin. If the content of the curing agent is less than 1% by weight, wear resistance may be reduced due to uncuring, and when the content of the curing agent is more than 5% by weight, the increase in hardness and the storage safety may be significantly lowered, so the above range is preferable.

The blowing agent may be modified azodicarbonamide (Modified Azodicarbonamide), and includes 1 to 5% by weight based on the total weight of the panel adhesive composition using an acrylic resin. If the content of the blowing agent is less than 1% by weight, the soundproofing may be lowered due to the lowering of the foaming rate. If the content of the blowing agent is higher than 5% by weight, the problem of deterioration of wear and rust resistance may occur due to over-foaming. good.

The moisture absorbent may use calcium oxide (CaO) to remove moisture in the product, and includes 1 to 5% by weight based on the total weight of the panel adhesive composition using an acrylic resin. If the content of the absorbent is less than 1% by weight, bubbles and pinholes may occur after the composition is cured, and when the content of the absorbent is more than 5% by weight, hardness may increase and viscosity may increase.

The colorant may use carbon, and includes 1 to 5% by weight based on the total weight of the panel adhesive composition using an acrylic resin.

Hereinafter, the present invention will be described in more detail based on the following examples. However, the present invention is not limited by the examples.

Examples 1-4

Next, the panel adhesive composition using the acrylic resin was prepared in each of the components shown in Table 1 and the blending amounts thereof. More specifically, after the acrylic resin is mixed, the filler is added to sufficiently disperse and the remaining composition is a plasticizer, a tackifier, a filler, a diluent, a curing agent, a foaming agent, a hygroscopic agent and a colorant, followed by melt kneading and stirring to form a panel adhesive composition using the acrylic resin. Was prepared. It is possible to manufacture by conventional methods used in the art, but is not limited thereto.

Comparative Examples 1 to 4

Next, the panel adhesive composition using the acrylic resin was prepared in the same manner as in Examples 1 to 4 as the components shown in Table 2 and the blending amounts thereof.

Experimental Example

The physical and mechanical properties of the panel adhesive compositions using the acrylic resins prepared in Examples and Comparative Examples were measured according to the following experimental methods. The results are shown in Tables 3 and 4 below.

1. Wearability

The specimen shall be fixed on a 60-degree ramp so that the center of the application surface of the specimen is adjusted to the position of 30 mm below the conduit of the abrasion tester as shown below. After loading the specimen, drop the 3 kg nut at a time and inspect the total weight of the required nut until the panel face of the specimen is exposed.

Nut: Hex nut made of 3 types M-4 brass of JIS B-1181

2. Foaming rate

3. Liquidity

As shown in the figure below, after masking a width of 50m at one end of a 300 × 100 × 0.8 panel, apply the above-mentioned composition uniformly to 2.0 mm, and then immediately remove the masking and move the masking part downward. The test piece was held vertically and left at room temperature for 30 minutes, then placed in a thermostat maintained at 150 ° C., heated for 30 minutes, and taken out to examine the length of the coating film.

4. Storage stability (%)

300 ml or more of the adhesive adjusted to 20 ± 1 ° C in advance is put into a sealed container so that the liquid level is 100 to 150 mm from the bottom, and after stirring, the spindle of the viscometer is rotated for 2 minutes, and then the viscosity scale is read. Saved. The viscometer measured by Rota No 7, rotation speed 2rpm using the direct rotational viscometer. And after storing for 168 hours in a constant temperature chamber (Chamber) of 40 ℃ ± 1 again measured the viscosity in the same manner as above. The change rate of the viscosity before storage and the viscosity after storage in a constant temperature chamber was calculated | required.

Results of measuring the physical properties of Examples 1 to 4 are shown in Table 3, and the results of measuring the physical properties of Comparative Examples 1 to 4 are shown in Table 4.

Looking at Tables 3 and 4 it was confirmed that the physical properties of the wear, foaming rate, flowability, storage stability and spray properties of Examples 1 to 4 using the panel adhesive composition using the acrylic resin of the present invention is superior to Comparative Examples 1 to 4. . In addition, through the experimental results of Example 1 and Comparative Example 1, it can be seen that the foaming rate of Example 1 having a plasticizer content of 27% by weight is about 6.5 times higher than that of Comparative Example 1 having a plasticizer content of 17% by weight. there was. As a result, when the content of the plasticizer was small, the plasticization of the acrylic resin was insufficient and the foaming rate was lowered.

In Example 2 including 8 wt% of the tackifier and Comparative Example 2 including 3% by weight of the tackifier, it was found that Example 2 improved the wear property twice as compared to Comparative Example 2. This was confirmed that the wear properties of the present invention including the adhesion imparting agent 5 to 15% by weight.

In Example 3 where the content of the diluent is 6% by weight and Comparative Example 3 where the content of the diluent is 10% by weight, the fluidity of Example 3 was 0 mm, but the fluidity of Comparative Example 3 was 11.5 mm. It was found that adding diluents adversely affected the fluidity. Finally, through Example 4 and Comparative Example 4, the composition of Comparative Example 4 containing no blowing agent was 17% foaming rate was not excellent in physical properties, but the foaming rate of Example 4 containing 2% by weight of blowing agent As can be confirmed that the foaming rate of Comparative Example 4 was improved by about 5.8 times. This was confirmed that by adding a foaming agent to the panel adhesive composition using an acrylic resin, a cell is formed when the composition is cured, thereby improving abrasion resistance through a buffering action during abrasion, and at the same time, further improving sound insulation.

This invention is very suitable for use as an adhesive for vehicle body lower panels.

Claims (2)

25 to 35% by weight of at least one acrylic resin selected from polymers or copolymers of methyl acrylate, methyl methacrylate, ethyl acrylate, n-butyl acrylate, t-butyl acrylate, and hexyl acrylate; 30 wt%, 5-15 wt% of tackifier, 20-30 wt% of at least one filler selected from calcium carbonate, talc, silica and clay, surface treated with surface treatment agent, 3-8 wt% of diluent, hardener 1-5 A panel adhesive composition using an acrylic resin, characterized by comprising a weight%, 1 to 5% by weight of the blowing agent, 1 to 5% by weight of the absorbent and 1 to 5% by weight of the colorant. The method of claim 1, The plasticizer is at least one resin selected from diisononyl phthalate and dioctyl phthalate, the adhesion imparting agent is a block isocyanate resin, the diluent isoparaffin resin, the curing agent is dihydrazide, the blowing agent is modified azodicarbonamide The panel adhesive composition using an acrylic resin, wherein the moisture absorbent is calcium oxide and the colorant is carbon.