KR20140038836A - Putty composition for reparing a vehicle - Google Patents

Abstract

The present invention relates to a putty composition for repairing a vehicle and, more particularly, to a putty composition for repairing a vehicle, having excellent workability, abradability and attachability during painting by using unsaturated polyester resin and using benzoyl peroxide as a curing agent.

Description

Putty composition for automobile repair {PUTTY COMPOSITION FOR REPARING A VEHICLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automotive repair putty compositions, and more particularly to automotive repairs that provide excellent workability, abrasiveness and adhesion in coating using unsaturated polyester resins as resins and benzoyl peroxide as curing agents. It relates to a putty composition useful for.

In general, unsaturated polyester resins have been applied to various fields because they are relatively inexpensive, can exhibit various physical and chemical properties according to workability to be cured within a short time at room temperature, and various selections of main raw materials. For example, construction materials such as bathtubs and septic tanks, industrial materials such as tanks and pipes, transportation equipment such as ships and automobiles, electric insulation materials, gel coats, resin concrete, putty paints, and the like are widely used in various applications.

Automotive repair putty is used to correct the dents of the sheet metal surface of the car, or to correct the grooves of the damaged area, the difference in the thickness of the finished film, and the irregularities. Putty paints for automotive repair should firstly exhibit fast curing properties at room temperature, secondly, have excellent polishing properties, and third, excellent adhesion to existing materials.

Polishing performance is a very important factor for workability in the repair process, and it is possible by providing air drying property (drying property by reaction with air) to the unsaturated polyester resin. In general, allyl compounds or iodine can be introduced into unsaturated polyester resins to provide air-drying properties to unsaturated polyester resins. Is difficult. In order to improve such a problem, conventionally, a method of adjusting the amount of polyhydric alcohol allyl ether component which has the greatest effect on polishing property in the production of unsaturated polyester resin, adding a polishing aid, or adjusting the pigment component on the paint formulation To improve the polishing performance. However, the method of adding the polishing aid can satisfy the polishing performance to some extent, but it is not realistic due to the increase in the resin price, and there is a limit to the improvement of the performance only by controlling the paint formulation without improving the basic polishing performance of the unsaturated ester resin. .

Meanwhile, in the case of a putty composition including an unsaturated ester resin, it may be classified into a cyclohexanone peroxide type and a benzoyl peroxide type according to the type of curing agent. The cyclohexanone peroxide type has advantages of excellent workability and low cost, but has a disadvantage of poor adhesion and storage. In addition, in the case of the benzoyl peroxide type, both adhesion and shelf life are good, but the disadvantage is poor polishing. Conventionally, the domestic market is dominated by putty products including cyclohexanone peroxide type unsaturated ester resin, which is a low-cost product having excellent workability, but recently, it is marketed as a putty composition containing benzoyl peroxide type unsaturated ester resin having good physical properties. The transition is taking place.

Accordingly, there is a need to develop a putty composition for repairing automobiles based on unsaturated ester resins that can provide excellent workability of low-cost products of the cyclohexanone peroxide type and excellent adhesion and storage properties provided by the benzoyl peroxide type.

An object of the present invention is to improve the excellent workability such as abrasiveness and hera workability while ensuring the excellent adhesion and storage properties of the putty composition comprising the benzoyl peroxide-type unsaturated ester resin as described above The purpose of the present invention is to provide an eco-friendly automobile repair putty composition having a low solids content of the resin and a minimum organic solvent content, thereby reducing the generation of volatile organic compounds (VOC).

In order to achieve the above object, 30 to 43% by weight of an unsaturated polyester resin; 1-3 wt% of benzoyl peroxide as a curing agent; 0.1-2 wt% of a curing catalyst; Additives 1-3 wt%; Solvent 1-10 wt%; And 30 to 60 wt% of extender pigment, wherein the unsaturated polyester resin comprises 65 to 68 wt% of solids based on the total weight of the resin, and the acid value (solid) of 16 to solids. An automotive repair putty composition is provided that is 24 mg KOH.

The unsaturated polyester resin of the present invention is preferably prepared by condensation reaction of propylene glycol, maleic anhydride and phthalic anhydride.

The curing catalyst of the present invention is preferably N, N-dimethylaniline or cobalt.

It is preferable that the solvent of this invention is a styrene monomer.

The additive of the present invention is preferably selected from the group consisting of dispersants, antifoaming agents, pot life retardants, coupling agents and mixtures thereof.

Putty composition for automobile repair according to the present invention through the combination of a specific unsaturated polyester resin and benzoyl peroxide improves the adhesion and storage properties compared to the prior art and at the same time has the effect of improving the workability, such as polishing, hera workability have.

Putty composition for automobile repair of the present invention is 30 to 43% by weight unsaturated polyester resin; 1-3 wt% of benzoyl peroxide as a curing agent; 0.1-2 wt% of a curing catalyst; Additives 1-3 wt%; Solvent 1-10 wt%; And 30 to 60 wt% of extender pigment, wherein the unsaturated polyester resin comprises 65 to 68 wt% of solids based on the total weight of the resin, and the acid value (solid) of 16 to solids. Putty composition for automobile repair which is 24 mg KOH.

The unsaturated polyester resin used in the putty composition of the present invention contains 65 to 68% by weight of solids based on the total weight of the resin, and is 16 to 24 mg KOH of acid value (solid) based on the solids. Unsaturated polyester resin according to the present invention includes 65 to 68% by weight solids based on the total weight of the resin, and if the acid value (solid) 16 to 24 mg KOH based on the solids, there is no particular limitation on the component . For example, the unsaturated polyester resin of this invention can use what was produced by condensation reaction of propylene glycol, maleic anhydride, and phthalic anhydride, and can also use a commercially available product.

Also, The polyester resin used in the present invention may be prepared by conventional methods well known in the art. For example, it can manufacture by the following method. First, an acid component, a glycol component, and an additive such as a catalyst and various stabilizers are added to a reaction vessel equipped with a stirrer, and the low molecular weight ester condensation by-product is removed out of the system and the ester reaction proceeds. The reaction was terminated based on the point at which 95% or more of the theoretical effluent of the low molecular weight ester by-product was flowed out. Induces ester condensation polymerization. In this way, the polycondensation may be carried out to stop the reaction at a suitable stirring load, to break the vacuum as nitrogen, and to discharge the reactant to prepare a polyester resin.

In the production of polyester resin, terephthalic acid is mainly used as an acid component and ethylene glycol is used as a glycol component, and an organic titanium compound such as an oxide of antimony or tetrabutyl titanate, tetraisopropyl titanate, etc. is mainly used as a catalyst. The conventional method is used, and other organic tin compounds alone or mixtures of these with organic titanium compounds, alkali metals and acetates may also be used. When using an organic titanium compound, magnesium acetate or lithium acetate may be used as a cocatalyst. In addition to these main components and catalysts, subsidiary materials such as antioxidants, antistatic agents and various additives may be used, and commercially available products may be used.

The unsaturated polyester resin should be included 30 to 43% by weight based on the total weight of the putty composition of the present invention. At this time, when the content of the unsaturated polyester resin is less than 30% by weight, the appearance is rough due to poor adhesion and lack of wetting power, and when the content is more than 43% by weight, the polishing property is weak and the surface of the coating is not preferable.

The glass transition temperature of the unsaturated polyester resin may be 0 ~ 15 ℃. When the glass transition temperature is within the above range, it may have appropriate coating strength and abrasiveness.

The putty composition of the present invention uses benzoyl peroxide as a curing agent. Benzoyl peroxide serves to provide good adhesion and shelf life to the putty composition of the present invention due to its highly reactive properties. The benzoyl peroxide is added to the ratio of 1 to 3% by weight based on the total weight of the putty composition of the present invention to cause a curing reaction. If the content is less than 1% by weight, the curing time is delayed, and if the content is more than 3% by weight, adhesion deterioration may occur.

The putty composition of the present invention uses a curing catalyst to shorten the curing time. The curing catalyst is preferably N, N-dimethylaniline or cobalt, but is not limited thereto. Such a curing catalyst is included in 0.1 to 2% by weight based on the total weight of the putty composition of the present invention. If the content is less than 0.1% by weight, the desired curing time shortening effect may not be obtained. If the content is more than 2% by weight, the pot life (ie, workable time) may be shortened, resulting in a problem that the putty composition gels during operation.

Putty composition of the present invention contains an additive 1 to 3% by weight in order to improve the physical properties. Examples of the additive that can be used in the present invention include dispersants, antifoaming agents, pot life delay agents, coupling agents, or mixtures thereof. Such dispersants, antifoaming agents, pot life retardants, coupling agents, functions and components are well known in the art, and therefore, the discussion is omitted here. If the content of these additives is less than 1% by weight, the effect of use cannot be obtained. If the content of the additive is more than 3% by weight, the properties of the putty composition of the present invention are deteriorated, which is not preferable.

Putty composition of the present invention contains a solvent 0 to 10% by weight for viscosity control. As such solvents, reactive diluents include styrene monomer, butylmethylmethacrylate, 2-hydroxyethyl methacrylate, butylacrylate, hydroxyethyl acrylate, acrylic acid, methacrylic acid, dipropylene glycol diacrylate, hydroxy Methacrylate, hydroxypropyl acrylate, hexanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, vinyltoluene, chlorostyrene, 2-phenoxyethyl methacrylate, 2-phenoxyethyl A styrene monomer selected from the group consisting of acrylic acid, ethoxylated bisphenol A diacrylate, ethoxylated nonyl phenol acrylate, and mixtures thereof, and preferably a reactive solvent is used, but not limited thereto. Solvents (reactive diluents) are applied to achieve the desired viscosity of the putty composition and do not have a lower limit for solvent content, but If it exceeds 10% by weight, the shelf life is poor, and it is likely to crystallize inside the can during commercialization.

Putty composition of the present invention uses a pigment for imparting a color for identification of the coating portion and the extender pigment for the physical properties such as flowability, abrasiveness. As such extender pigments, talc, fumed silica, extenders (low specific gravity polymer fillers) and the like may be used, but are not limited thereto. The extender pigment is included in 30 to 60% by weight based on the total weight of the putty composition. If the content of the extender pigment is less than 30% by weight, there is a problem of losing the function of the automotive repair paints due to the lack of abrasiveness, and if it exceeds 60% by weight, it is difficult to disperse during production.

Hereinafter, the present invention will be described in detail by way of examples. However, this embodiment is only for illustrating the present invention and the present invention is not limited thereto.

Example  1 to 2 and Comparative Example  1-2

The coating composition was prepared in the composition as shown in Table 1 below.

 Unit: wt% ingredient Example 1 Example 2 Comparative Example 1 Comparative Example 2 Unsaturated Polyester Resin1) 19 23 13.8 28.8 Unsaturated polyester resin 2) 14 17 10.2 21.2 Curing Catalyst 3) 1.2 1.2 1.2 1.2 Additive 4) 2 2 2 One Extender pigments5) 57.8 48 66.8 41.8 Solvent 6 4 6.8 4 4 Benzoyl peroxide 2 2 2 2 Sum 100.00 100.00 100.00 100.00

Note 1) Unsaturated polyester resin: Solid content 67% by weight, Acid Value (solid) 16.84 mg KOH, Viscosity 680 cp, GEL TIME 6 minutes 06 seconds (at 25 ℃), REACTIVITY-PEAK TEMPERATURE 168 ℃, REACTIVITY-PEAK TIME 6.5 Minutes (product of ECE BOYA KIMYA SAN company)

Note 2) Unsaturated polyester resin: Solid content 67% by weight, Acid value (solid) 21.3 mgKOH, Viscosity 690 mPa.s, GEL TIME 10.5 minutes, REACTIVITY-PEAK TEMPERATURE 115 ℃, REACTIVITY- PEAK TIME 10 minutes (DSM COMPOSITE RESIN AG) Four products)

Note 3) Curing catalyst: N, N-dimethyl aniline

Structural Formula: Ph-N (CH3), Molecular Weight: 135.2, Melting Point (mp): 2.5 ℃, Boiling Point (bp): 194 ℃, Specific Gravity: 0.95, Purity: 99% (manufactured by Mitsubishi Chem.)

Note 4) Additive: Dispersant (ANTI-TERRA U)

Polyamine Amides Salt (52%), Xylene (39%), Isobutanol (5%), Boiling Point (bp): 106 ° C, Specific Gravity: 0.94g / mg, Amine Value: 19 mgKOH / g, Acid Value: 24mgKOH / g, Solids: 50% (by BYK Chemie company)

Note 5) extender pigment: talc (TALC)

① TA-400: content ratio: 17%, TALC (100%), specific gravity: 3.02g / cm3, Sieve Residue (# 325 mesh): 0.5%, Oil absorption: 29g / 100g (manufactured by Lexem)

② FINNTALC M-40: Content ratio: 40%, TALC (100%), specific gravity: 2.78g / cm3, Particle Size: D50-15㎛, D98-50㎛, Oil absorption: 24g / 100g (manufactured by Mondo Miner BV) )

Note 6) Solvent: Styrene monomer (Stylene monomer)

Stylene monomer (99.5%), boiling point (bp): 146 ° C, specific gravity: 0.906, (SAMSUNG TOTAL, YEOCHUN NCC, HONAM PETROCHEMICAL, DONGBU HANNONG company)

Experimental Example

The composition of each coating film was evaluated according to the experimental method of Table 2 about the composition obtained according to the said Examples 1-2, and the composition of Comparative Examples 1-2. All tests except viscosity (running at 20 ° C.) were performed at 25 ° C.

One N.V (%) 2 g of paint was heated at 105 ° C for 1 hour to volatilize and calculate the remaining amount. 2 importance Specific gravity is used with specific gravity cup (S224389, Sheen) at 25 ℃ 3 Viscosity BLOOK FIELD Viscometer (viscosity after 20 degrees Celsius three minutes) 4 Hera workability Workability such as weight and application state delivered by hand when putting putty when mixing hardener 5 Exterior Exterior leveling, bubbles, etc. (putty alone) 6 Flowability 10mm * 10mm (width * height) change in width after vertical coating (when% high, poor flowability) 7 Abrasiveness 30 minutes / 1 hour / 24 hours after painting 8 Attachment cross cut 2mm 9 High Temperature Storage (60 ℃) Check the shelf life of hard cakes and top SM crystals in 60 ℃ oven

division Test result Example  One Example  2 Comparative Example  One Comparative Example  2 One N.V (%) 80.9 76 83.6 76.8 2 importance 1.76 1.66 1.84 1.6 3 Viscosity (cPs) 340,000 210,000 850,000 195,000 4 Hera workability ○ ○ X ○ 5 Exterior ○ ○ X ○ 6 Flowability ○ △ ○ X 7 Abrasiveness ○ △ ○ X 8 Attachment ○ ○ △ ○ 9 High Temperature Storage (60 ℃) ○ ○ X △

* ○: very good, △: excellent, X: poor

As shown in Table 3, the putty composition of the present invention was confirmed to have flowability and high temperature storage while simultaneously satisfying negative correlation between abrasiveness and hera workability, appearance, and adhesion.

Claims (5)

30 to 43% by weight of unsaturated polyester resin;
1-3 wt% of benzoyl peroxide as a curing agent;
0.1-2 wt% of a curing catalyst;
Additives 1-3 wt%;
Solvent 1-10 wt%; And
As a putty composition for automobile repair comprising 30 to 60% by weight of extender pigment,
The unsaturated polyester resin, 65 to 68% by weight solids based on the total weight of the resin, the solids based Acid Value (solid) 16 ~ 24 mg KOH automotive repair putty composition. The putty composition for automobile repair of claim 1, wherein the unsaturated polyester resin is prepared by condensation reaction of propylene glycol, maleic anhydride and phthalic anhydride. The putty composition for automobile repair according to claim 1, wherein the curing catalyst is N, N-dimethylaniline or cobalt. The putty composition for automobile repair according to claim 1, wherein the solvent is a styrene monomer. The putty composition for automobile repair of claim 1, wherein the additive is selected from the group consisting of a dispersant, an antifoaming agent, a pot life delaying agent, a coupling agent, and a mixture thereof.