KR102142121B1 - Primer composition for polycarbonate material - Google Patents

Abstract

The present invention relates to a primer composition for a polycarbonate material, and more specifically, to use a polar solvent in a primer composition, which is eco-friendly, and enables an excellent adhesion reinforcing effect to a poor adhesion material such as polycarbonate. It relates to a primer composition for a carbonate material.

Description

Primer composition for polycarbonate materials{PRIMER COMPOSITION FOR POLYCARBONATE MATERIAL}

The present invention relates to a primer composition that is environmentally friendly because it does not use a polar solvent, and can realize an excellent adhesion reinforcing effect to a poor adhesion material such as polycarbonate.

In general, polycarbonate (PC) is a material that is widely used in a wide range of fields based on its excellent workability, impact resistance, tensile strength, low temperature and high temperature characteristics, dimensional stability, flame retardancy, transparency, and electrical characteristics, and its demand is high. It is an increasing trend.

However, the polycarbonate is a non-adhesive and non-adhesive material having high internal crystallinity, and there are many difficulties in the adhesion process, and a solution to this is required.

In this regard, Patent Document 1 tried to improve adhesion by imparting a polar group to the polycarbonate material itself, and specifically, a polycarbonate resin and a rubber-modified polystyrene-based resin as a basic resin, and oxazoline, maleic anhydride or carboxylic acid functional groups as compatibilizers. It proposed a polycarbonate-based resin composition using a styrene-ethylene-butylene-styrene block copolymer having a.

That is, as a method for adding a polar group by adding maleic anhydride (MAH) to polycarbonate, which is a non-polar material, this method has a limited range of use, that is, it can be applied only to specific products, and it can be applied to products with elasticity. Due to problems such as wettability, there was a problem in that the effect of improving the adhesion was not exhibited.

Therefore, most of the primers are used to reinforce the adhesion to the polycarbonate material, and as a related prior art, Patent Document 2 proposes a non-polar material primer or an adhesive polyurethane-based primer.

However, the conventional primer as described above is manufactured using a polar solvent such as toluene, which has problems such as inhibiting the health of workers, causing discomfort during work, and adversely affecting environmental protection. Research and development are actively underway to minimize possible use of irritating solvents and to improve adhesive properties such as primer adhesion.

Patent Document 1: Republic of Korea Patent Registration No. 10-0212966 "Polycarbonate-based resin composition" Patent Document 2: Republic of Korea Patent Registration No. 10-1264809 "Non-polar material primer or adhesive polyurethane-based composition"

The present invention is intended to solve the above problems, and it is an object to use an polar solvent in a primer composition to be eco-friendly and to realize an excellent adhesion reinforcing effect to a poor adhesion material such as polycarbonate.

The present invention in the primer composition, chloroprene rubber / nano silica composite 4 ~ 6% by weight, thermoplastic polyurethane (thermo plastic polyurethane) resin 0.2 ~ 0.4% by weight, adhesion promoter 0.2 ~ 0.4% by weight and solvent 93.2 ~ 95.6% by weight The primer composition for a polycarbonate material is characterized in that it is made as a solution to the problem.

Here, the chloroprene rubber/nano silica composite is preferably made of 0.5 to 10 parts by weight of nano-silica having a particle size of 5 to 15 nm, with respect to 100 parts by weight of chloroprene rubber.

In addition, the adhesion promoter is petroleum resin, alkylphenol (alkylphenol) resin, rosin (rosin), rosin ester (rosin ester) resin or coumaroneindene (Coumaroneindene) resin is preferably used alone or in combination of two or more.

In addition, the solvent, methyl ethyl ketone (methylethylketone), ethyl acetate (ethylacetate), cyclohexane (cyclohexane), acetone (Acetone), isopropyl alcohol (isopropylalcohol) or methyl cyclohexane (methylcyclohexane) 3 or more combinations It is preferred to use.

The present invention does not use a polar solvent in the primer composition, and is environmentally friendly, but has excellent adhesion reinforcing effect to difficult-adhesive materials such as polycarbonate.

It should be noted that the present invention relates to a primer composition for a polycarbonate material, and only parts necessary for understanding the technical configuration of the present invention will be described, and descriptions of other parts will be omitted so as not to distract the subject matter of the present invention.

Hereinafter, the primer composition for a polycarbonate material according to the present invention will be described in detail.

The primer composition for a polycarbonate material according to the present invention comprises 4 to 6% by weight of a chloroprene rubber/nano silica composite, 0.2 to 0.4% by weight of a thermoplastic polyurethane resin, 0.2 to 0.4% by weight of an adhesion promoter, and 93.2 to 95.6% by weight of a solvent.

The chloroprene rubber/nano silica composite is added to improve the adhesion strength to the primer composition, and is made by dispersing 0.5 to 10 parts by weight of nano silica having a particle size of 5 to 15 nm with respect to 100 parts by weight of chloroprene rubber. At this time, if the particle size and content of the nano-silica is out of the above range, there is a fear that the improvement efficiency such as adhesion strength is insufficient.

On the other hand, the chloroprene rubber/nano silica composite made of the above is used in the primer composition is 4 to 6% by weight, if the content is less than 4% by weight, there is a fear that the improvement efficiency such as adhesion strength may be insufficient, 6% by weight If it exceeds, there is a concern that the rate of increase in effect compared to the amount of use is insufficient, which is uneconomical.

The thermoplastic polyurethane resin is intended to impart adhesion reinforcing power to the primer, and if the amount used is less than 0.2% by weight, the effect of improving the adhesion reinforcing power may be insufficient, and when it exceeds 0.4% by weight, the viscosity increases, thereby improving workability. There is a fear that this may decrease.

The adhesion promoter is used for the purpose of improving the adhesion to the primer composition, and various known adhesion promoters can be used, but for example, petroleum resin, alkylphenol resin, rosin, rosin ester resin Alternatively, it is used alone or in combination of two or more of Coumaroneindene resins. On the other hand, if the content of the tackifier is less than 0.5% by weight, there is a concern that the efficiency of improving the adhesive strength may be insufficient, and when it exceeds 1.5% by weight, solubility may decrease and solid content control may not be easy.

The solvent is not particularly limited, and various known solvents can be used, for example, methylethylketone, ethylacetate, cyclohexane, acetone, and isopropylalcohol. Or it may be used by selecting from the group consisting of methyl cyclohexane (methylcyclohexane). On the other hand, in the present invention, since the solubility may be insufficient because it does not contain toluene, it is preferable to use three or more solvents.

Hereinafter, the configuration of the present invention will be described in detail by the following examples. The configuration of the present invention is not necessarily limited only by the following examples.

1. Preparation of chloroprene rubber/nano silica composite

(Production Example 1)

By mixing 0.5 parts by weight of nano silica (Aerosil 200, Degussa Co.Ltd) with a particle size of 12 nm with 100 parts by weight of chloroprene rubber (CR, DENKA Co.Ltd) into a banbury mixer, followed by kneading and dispersion. Chloroprene rubber/nano silica composites were prepared.

(Production Example 2)

In a banbury mixer, chloroprene rubber/nano silica composite was prepared by adding 1.0 part by weight of nano silica having a particle size of 12 nm to 100 parts by weight of chloroprene rubber, followed by kneading and dispersion.

(Production Example 3)

In a banbury mixer, chloroprene rubber/nano silica composite was prepared by adding 2.0 parts by weight of nano silica having a particle size of 12 nm to 100 parts by weight of chloroprene rubber, followed by kneading and dispersion.

(Production Example 4)

In a banbury mixer, chloroprene rubber/nano silica composite was prepared by adding 3.0 parts by weight of nano silica having a particle size of 12 nm to 100 parts by weight of chloroprene rubber, followed by kneading and dispersion.

(Production Example 5)

To a banbury mixer, chloroprene rubber/nano silica composite was prepared by adding 4.0 parts by weight of nano silica having a particle size of 12 nm to 100 parts by weight of chloroprene rubber, followed by kneading and dispersion.

(Production Example 6)

To a banbury mixer, chloroprene rubber/nano silica composite was prepared by adding and mixing and dispersing 5.0 parts by weight of nano silica with a particle size of 5 nm with respect to 100 parts by weight of chloroprene rubber.

(Production Example 7)

In a banbury mixer, chloroprene rubber/nano silica composite was prepared by adding and mixing and dispersing 10.0 parts by weight of nano silica having a particle size of 15 nm with respect to 100 parts by weight of chloroprene rubber.

2. Preparation of primer composition

(Example 1)

Chloroprene rubber/nano silica composite according to Preparation Example 1 5.4 wt%, thermoplastic polyurethane (thermo plastic polyurethane) resin 0.3 wt%, adhesion promoter (Tackirol 201, alkylphenol formaldehyde resin, Daoka Chemical Co., Ltd.) 0.3 wt% and solvent 94% by weight (cyclohexane 75.2% by weight + methyl ethyl ketone 18.8% by weight) was added and stirred at room temperature (15 ~ 25 ℃) for 8 hours to prepare a primer composition having a total solid content of 6%.

(Example 2)

Chloroprene rubber/nano silica composite according to Preparation Example 2 5.4% by weight, 0.3% by weight of a thermoplastic polyurethane resin, 0.3% by weight of an adhesion promoter and 94% by weight of a solvent were added thereto and stirred at room temperature (15 to 25°C) for 8 hours to total A primer composition having a solid content of 6% was prepared.

(Example 3)

Chloroprene rubber/nano silica composite according to Preparation Example 3 5.4% by weight, 0.3% by weight of a thermoplastic polyurethane resin, 0.3% by weight of an adhesion promoter and 94% by weight of a solvent were added thereto and stirred at room temperature (15 to 25°C) for 8 hours to total A primer composition having a solid content of 6% was prepared.

(Example 4)

Chloroprene rubber/nano-silica composite according to Preparation Example 4 5.4% by weight, 0.3% by weight of a thermoplastic polyurethane resin, 0.3% by weight of an adhesion promoter and 94% by weight of a solvent were added thereto and stirred at room temperature (15 to 25°C) for 8 hours to total A primer composition having a solid content of 6% was prepared.

(Example 5)

Chloroprene rubber/nano silica composite according to Preparation Example 5 5.4 wt%, thermoplastic polyurethane resin 0.3 wt%, adhesion promoter 0.3 wt% and solvent 94 wt% were added and stirred at room temperature (15 to 25°C) for 8 hours to total A primer composition having a solid content of 6% was prepared.

(Example 6)

The chloroprene rubber/nano silica composite according to Preparation Example 6 was added 4 wt%, a thermoplastic polyurethane resin 0.2 wt%, an adhesion promoter 0.2 wt% and a solvent 95.6 wt% (cyclohexane 76.0 wt% + methyl ethyl ketone 19.6 wt%). The mixture was stirred at room temperature (15-25°C) for 8 hours to prepare a primer composition having a total solid content of 6%.

(Example 7)

The chloroprene rubber/nano silica composite according to Preparation Example 7 was added by weight 6 wt%, thermoplastic polyurethane resin 0.4 wt%, adhesion promoter 0.4 wt% and solvent 93.2 wt% (cyclohexane 74.8 wt% + methyl ethyl ketone 18.4 wt%) The mixture was stirred at room temperature (15-25°C) for 8 hours to prepare a primer composition having a total solid content of 6%.

(Comparative Example 1)

Without using chloroprene rubber/nano silica composite and thermoplastic polyurethane resin, chloroprene rubber alone was used, specifically, 5.7% by weight of chloroprene rubber (CR, DENKA Co.Ltd), adhesion promoter (Tackirol 201, alkylphenol formaldehyde) Resin, Daoka Chemical Co.) 0.3% by weight and 94% by weight of solvent (cyclohexane 75.2% by weight + methyl ethyl ketone 18.8% by weight) were added and stirred at room temperature (15 to 25°C) for 8 hours to obtain a total solid content of 6%. A phosphorus primer composition was prepared.

3. Evaluation of primer composition

The primer composition according to Examples 1 to 7 and Comparative Example 1 was measured for initial adhesion and state adhesion by the following methods, and the results are shown in [Table 1].

(1) Psalm

After cutting the adherend of polycarbonate material to 1×10 cm each, washing with methyl ethyl ketone (MEK), applying the primer composition according to Examples and Comparative Examples once, heat-treating at 60° C. for 2 minutes, and then drying the adhesive ( W-50, Henkel) and dried at 60°C for 2 minutes. Then, the rubber was cut into 1×10 cm, washed with methyl ethyl ketone, heat-treated at 60° C. for 2 minutes, dried, and then applied with a load of 3 to 4 kgf using a hand roller to adhere to the adherend of the polycarbonate material.

(2) Initial adhesion

The prepared adhesive specimens were left at room temperature for 30 minutes, and then peeled at a rate of 100/min using a universal tensile tester (UTM, LT2100C) to evaluate the adhesive strength. Five adhesive specimens were measured to measure the average value (KS M3725-87).

(3) state adhesion

The prepared adhesive specimen was left at room temperature for 24 hours, and then peeled at a rate of 100/min using a universal tensile tester (UTM, LT2100C) to evaluate the adhesive strength. Five adhesive specimens were measured to measure the average value (KS M3725-87).

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Comparative Example 1 Early
Adhesion
(kgf/cm, 30min) 2.4 2.5 2.6 2.6 2.9 2.7 2.7 0.4 state
Adhesion
(kgf/cm, 24hr) 3.3 3.4 3.4 3.6 3.6 3.4 3.5 0.4

As shown in [Table 1], it can be seen that the primer composition according to the embodiment of the present invention does not use a polar solvent, and is eco-friendly, and realizes an excellent adhesion reinforcing effect to a poor adhesion material such as polycarbonate.

As described above, the primer composition for a polycarbonate material according to the present invention was confirmed through the above examples, and the present invention is the idea of the present invention as described in the following claims by those skilled in the art and It will be understood that various modifications and changes may be made to the present invention without departing from the scope.

Claims (4)

In the primer composition,
A chloroprene rubber/nano silica composite 4 to 6% by weight, a thermoplastic polyurethane resin 0.2 to 0.4% by weight, an adhesion promoter 0.2 to 0.4% by weight and a solvent comprising 93.2 to 95.6% by weight, polycarbonate primer composition for a material.
According to claim 1,
The chloroprene rubber/nano silica composite,
Primer composition for a polycarbonate material, characterized in that 0.5 to 10 parts by weight of nano-silica having a particle size of 5 to 15 nm is dispersed with respect to 100 parts by weight of chloroprene rubber.
According to claim 1,
The adhesion promoter,
Primer for polycarbonate material, characterized by being used alone or in combination of two or more of petroleum resin, alkylphenol resin, rosin, rosin ester resin or coumaroneindene resin. Composition.
According to claim 1,
The solvent,
It is characterized by being used in combination of 3 or more types in the group consisting of methylethylketone, ethylacetate, cyclohexane, acetone, isopropylalcohol or methylcyclohexane. A primer composition for a polycarbonate material.