JPH02166178A - Stainproofing agent for coating film of automobile - Google Patents

Abstract

PURPOSE:To obtain a stainproofing agent which can form a film which can prevent the coating film of an automobile from being stained with ambient dirts by mixing a specified rigid polyolefin with a linear dimethylpolysiloxane and a specified solvent. CONSTITUTION:0.5-20.0wt.% rigid polyolefin (A) of an m.p. >=110 deg.C, a penetration <=1.5mm (JIS K 2530) and an acid value <=50 is mixed with 0.5-30.0wt.% linear dimethylpolysiloxane (B) of the formula (wherein n is 2-10) and 50-99wt.% solvent (C) selected from among a solvent (a) based on an aliphatic or aromatic solvent and having a b.p. of 150-300 deg.C, water (b) containing an emulsifier which can emulsify components A and B and a mixture (c) of (a) with (b). In this way, a stainproofing agent which can form a thin film of a rigid polyolefin on the coating film of an automobile can be obtained.

Description

Detailed Description of the Invention: "Industrial Application Field" The present invention is directed to a coating that attempts to protect the original beauty of the paint film from the fact that the paint film of an automobile is contaminated by pollutants in the natural world. The present invention relates to an antifouling agent that forms a stain.

``Prior Art and Problems to be Solved by the Invention'' Automotive coatings normally contain dust, sand, dirt, mud, exhaust gas, tire wear mist, tar, pitch, etc. in the natural world.
It is much more polluted than K due to factory smoke, construction sites, and scattered mist from farms.

Particularly on the paint film of 1-white cars, the dirt is very noticeable and cannot be removed with water or simple cleaning. is difficult.

Examples include waxing with compound or cleaner, and washing the car with strong detergent. In response to such contamination phenomena, we provide a previously unseen strong coating that prevents stains and reduces this heavy cleaning work.
Moreover, it is intended to maintain a beautiful appearance.

Conventional methods used to restore contaminated coatings include cleaning with two ping compounds, cleaner waxes, and strong detergents as described above. Rubbing compounds and strong detergents generally do not have the function of forming a protective coating on a paint film, and are therefore completely unrelated to the present invention. On the other hand, car waxes such as cleaner waxes exhibit their original functions and are closely related to the present invention.

However, the mechanism of the glossy protective film formed by such car waxes is mainly composed of natural or synthetic wax components, oils and fats, and non-volatile high degree of polymerization silicone. A mixture consisting of such components is
It is soft, sticky, and easily adheres to painted surfaces, but it also allows contaminants from the outside world to easily adhere to it.

Therefore, even though conventional car waxes have the effect of removing dirt, polishing and waterproofing effects, they tend to promote staining.

The present invention eliminates the staining tendency seen in conventional car waxes, and also aims to protect the aesthetic appearance of the paint film from natural stains.

"Means and Actions for Solving the Problems" The present invention has solved the above problems, and is an antifouling agent for automobile paint films characterized by containing the following components A2B and C.

A, Melting point: 110℃ or higher, Penetration: 1.5da or lower (JIS
K 2530 L Hard polyolefin with an acid value of 50 or less 0.5-20.0wt'4B, linear dimethylpolysiloxane represented by the following general formula CI) 0.5-30
．． 0wt%n=2-10 C8 Any of the following solvents (a) to (c) 50-99
wt% (a) A solvent mainly consisting of an aliphatic or aromatic solvent with a boiling point of 150 to 300°C ←) Water containing an emulsifier capable of emulsifying the above A and B components (c) A mixture of the above (a) and fP) The present invention does not use soft natural or synthetic wax components or oils and fats, but uses a hard polyolefin, which is much harder than these and has a high melting point, as the main component of the coating. Furthermore, since it is extremely difficult to form a uniform thin film using this polyolefin alone, it is necessary to use a low molecular weight dimethylpolysiloxane with low volatility and a solvent together as an aid to uniformly fix this film. The present invention has been completed. Of course, it can be used as an oil-based solvent or an emulsion, and can be made into any form such as a paste or liquid. In addition, the method of using the present invention is to spread an appropriate amount onto a clean coating surface with a sponge or cloth, leave it for a while to volatilize the solvent in the composition, and then wipe it with a clean cloth to remove the coating. Forming 9 consists of forming a strong polyolefin coating by subsequent spontaneous release of dimethylpolysiloxane.

The hard polyolefin used in the present invention has a melting point of 110°C
With the above, the penetration level (JIS K 2530101', 25
°C, 5 seconds) is less than 1.5 dlE1, and the acid value is 5
It is less than or equal to 0.

Regarding the melting point, since the temperature of the painted surface under direct sunlight becomes very high, this heating softens or melts the film on the painted surface, resulting in the film becoming sticky and susceptible to external pollution. The temperature should be as high as possible, preferably at 120°C, as there is a strong possibility that objects will be glued together and contaminants will eventually be trapped in the film, degrading the beautiful appearance of the film.
I would prefer a book with the above.

Regarding penetration, it refers to hardness and is 1.5.
The lower the clfi is, the softer it is and the harder it is for dirt to adhere to it, and the more likely it is to soften or liquefy when the painted surface is heated, making it more likely to trap dirt, so it is preferable to have it as low as possible. In particular, if the hardness is 1.04w or less, the hardness is more preferable.

Regarding the acid value, it is preferable that the acid value is less than 30, especially for the purpose of limiting the polar groups that easily lead to adhesion and wetting phenomena and minimizing the adhesive bonding of contaminants. Most preferably, it is 0.

In the present invention, such a polyolefin has a weight of 0.5 to 20.0w.
t% is preferable, and 1 to 10 wt% is particularly preferable.

When the amount is less than 0.5 wt%, it becomes difficult to apply it evenly because it creates a lump 2 when spreading, and
If it exceeds 20.0 wt%, the wiping work becomes heavy and the cine cleaning process is wasteful.

The linear dimethylpolysiloxane represented by the formula CI) used in the present invention has a K (average) of 2 to 10, preferably K
is 4 to 8, and has low volatility. This silicone is used to form a thin and uniform polyolefin film, and it only needs to remain until the coating process is completed, after which it evaporates or is easily washed away by rainwater and disappears from the polyolefin wave antinode. It is something that can be done. In addition, silicone is completely incompatible with polyolefin, and because of its low molecular weight, it is unlikely to be molecularly entangled with polyolefin, and because it is volatile, it does not remain in the polyolefin layer. There is no possibility of weakening the hardness of the polyolefin coating.

In this way, the polyolefin coating can form a dense nine-layer structure consisting of almost single molecules.

Additionally, since the silicone remains during the application process, the silicone's release action allows the excess silicone polyolefin to be easily wiped off, resulting in a very thin film remaining on the painted surface of the car. can be formed.

As described above, since a dense and thin laminated structure of hard polyolefin is formed, dirt and dust from the outside world will not stick to the painted surface of the car.

Moreover, since this coating itself is hard, has few polar groups, and has a low surface tension, contaminants are less likely to adhere to or penetrate into this coating. As a result, the car's paint film is less likely to get dirty and maintains its beautiful appearance for a long time.

The amount of such silicone is 0.5 to 30.0w in the present invention.
t% is preferable, particularly 1 to 20 wt% is more preferable. When the amount is less than 0.5 wt%, it tends to be uneven when spreading, or it may be too thin, making it difficult to apply uniformly. If it exceeds 30.0wt, it may prevent the adhesion of the polyolefin component to the painted surface, the thickness of the formed polyolefin film may become too thin, it may cause difficulty in coating work, and it may be economically wasteful. This is not desirable because it can cause

Reference value Boiling point °C Viscosity as/25 °C 5 = 4 14
1.4 (20gwHg) 2.6n = 5
165.2 (20mHg) 3.25 = 6
185.6 (20flHg) 3.9π=
7 198.8 (16aHg) 4.6'E
= 8 202.8 (10 nlHg) Approximately 6 The solvent used in the present invention is selected from the following (a), (b), and e→.

(a) Those mainly composed of aliphatic solvents or aromatic solvents,
It is preferable that the boiling point range is 150 to 300°C and the aniline point is 40°C or higher.

(b) Water containing an emulsifier capable of emulsifying the above A and B components (c) A mixture of the above (a) and (b) (a) is generally used as a solvent for the wax to dissolve the wax component and the silicone component. It can be anything that is customary for carrying out or dispersing. For example, industrial gasoline, kerosene, mineral spirits, Stodderdon Rubent, isoparaffinic solvents, sodium chloride solvents, and odorless solvents are representative.

As for (b), water is used as a general rule, but surfactants that can emulsify or solubilize and uniformly disperse the polyolefin or silicone of the present invention in the form of fine particles can be used in water. For example, such emulsifiers include fatty acid salts (N!L,
KSLt, alkanolamine, morpholine, ammonia salts, etc.), alkyl sulfate ester salts CN&S KN
Salts of Li%alkanolamines, morpholine, ammonia, etc.), alkylbenzene sulfonates (Na5K,
L l, salts of alkanolamines, morpholine, ammonia, etc.), alkyl phosphate ester salts CN&, KS
salts of Li, alkanolamines, morpholine, ammonia, etc.), polyoxyethylene alkyl sulfate salts (Na, K.

Anionic surfactants such as Ll, alkanolamines, morpholine, salts of ammonia, etc.) polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers, sorbitan fatty acid esters,
Polyoxyethylene rubitan fatty acid ester, polyhydric alcohol fatty acid ester, polyoxyethylene polyhydric alcohol fatty acid ester, polyoxyethylene alkylamine, polyoxyethylene fatty acid ester, oxyethylene oxypropylene block polymer fatty acid alkanolamide, amine oxide, etc. Nonionic surfactants represented by polyoxyethylene derivatives, cationic surfactants represented by alkylamine salts, quaternary ammonium salts, etc., amphoteric surfactants represented by alkyl betaines, and the above. A fluorine-based surfactant containing a fluoroalkyl group instead of the hydrocarbon that forms the oily part of the hydrocarbon-based surfactant, and dimethylsiloxane instead of the hydrocarbon that forms the oily part of the above hydrocarbon-based surfactant. Examples include silicone surfactants containing , and other commonly used surfactants that have emulsifying, solubilizing, and dispersing properties. In the present invention, these are preferably 5 wt% or less, particularly 3 wt% or less, and 0.2 wt% or more. If it exceeds 5 wt%, there is a risk that it will cause bad shadows on the painted surface of the car, remain in the polyolefin film and weaken the film, and make the coating process more difficult. Also, when υ decreases by 0.2wt%,
It becomes difficult to uniformly emulsify and disperse the polyolefin and silicone used in the present invention in water.

e→ consists of an appropriate mixture of 0) and (b).

In other words, when the solvent and water are in an emulsion or solubilized state,
/W type b can be emulsified or solubilized into any of the W2O type using a surfactant that is commonly used for emulsification.

Such a solvent composition is very effective in cleaning dirt adhering to the painted surface of an automobile, and is extremely useful when the present invention has both a cleaning effect and a stain prevention effect. It is something.

In the present invention, the above solvent is preferably 50 to 99 wt%, particularly preferably 70 to 98 wt%. 50w
If it is less than t, there is a risk that the coating will not be spread smoothly, that the amount of coating will be too thick and it will be difficult to wipe it off, or that the shape will not be completed properly. On the other hand, if the amount of 99wttsxb is too large, the application of almost only the solvent will be spread out, making it difficult to uniformly fix the effective polyolefin and making it difficult to obtain the desired effect sufficiently.

Other components that can be used alone or in combination as auxiliaries are described below.

(1) In order to form the paste-like (solid) form of the present invention, the following natural or synthetic wax components have been conventionally used in car waxes as blocking agents.

Carnauba wax, montanic acid wax and its derived wax, nonpolar synthetic wax, and synthetic ester wax are used alone or in combination, and the content of the present invention is 25 wt%.

In particular, it is preferably 20 wt% or less.

(2) A fine powder that has been conventionally used in car wax as an abrasive to impart cleaner properties to the present invention.

Kaolin, talc, silica, diatomaceous earth, perlite, calcium carbonate, zeolite, alumina, hydrated silicic acid, chromium oxide, titanium oxide, zinc oxide, iron oxide, zirconium oxide, silicon oxide, cerium oxide, magnesium oxide, calcium fluoride, / Tonite, montmorillonite, shirasu balloon, mica, calcium silicate, zirconium silicate, diamond, glass, ceramic, polyolefin powder, nylon powder, polystyrene powder,
Cellulose powder, Teflon powder, higher fatty acid bisamide, higher fatty acid metal soap, amino acid powder, silicone powder, and other synthetic resin powders, used alone or in combination, are preferably used in an amount of 25 wt% or less, particularly 20 wtJ or less in the present invention.

(3) When imparting cleaning properties, in order to further enhance the effect, the following solvents with strong solubility may be used in place of a part of the solvent in the present invention in an amount of 20 wt % or less, especially 10 wt %. % or less.

Aromatic solvents, chlorine-based solvents, ester-based solvents, alcohol-based solvents, ether-based solvents, ketone-based solvents, and other commonly used cleaning solvents that do not adversely affect brittle surfaces (4) This invention In the present invention, glycols and alcohols such as ethylene glycol, propylene glycol, ethanol, isopropyl alcohol, and other commonly used substances having an antifreeze effect are used to prevent freezing when using water. In the present invention, it can be used in an amount of 20 wt% or less, particularly 10 wt% or less, in place of a part of the water.

(5) To adjust the volatilization rate in order to shorten the time of the coating process, the following solvents were used in place of some of the solvents in the present invention, which are more volatile than the solvents used in the present invention. It can be used at a medium temperature of 50vrt1 or less, particularly 20vrt1 or less.

Aliphatic solvents or those mainly composed of aliphatic solvents with a boiling point lower than 150°C, or fluorine-based solvents (6) Others,
Substances that increase the synergistic effect as a secondary effect include those commonly used in car waxes, such as ultraviolet absorbers, antioxidants, quenchers, and water-repellent, oil-repellent substances such as fluororesins, and the sustained effect of the present invention. Polyolefin fixatives, fragrances, colorants, rust preventives, etc. that enhance the properties of the polyolefin may be added in an amount of 5 wt% or less, particularly 2 vrt% or less, in the present invention.

(7) The present invention can also be made into an aerosol, in which case LPG is commonly used as a carrier gas.

Freon gas, DME, carbon dioxide, liquid nitrogen, etc. can be used in an amount of 1 to 300 parts based on 100 parts of the present invention.

“Examples and Comparative Examples” Example 1 Hoechstwax PE 130*” 4wt
% Shin-Etsu Silicone KF96L 5” 2 #
Pegasol 3040*3 941100
l *1 Polyethylene, Hoechst (West Germany), melting point 122
~127°C, Penetration (same below dll) (1,5, Acid value (same below '19KOH/9) O *2 Dimethylpolysiloxane, Shin-Etsu Chemical KK.

Viscosity (same below 25°C) 5 csS5=γ~8, volatile content (same below 150°C x 24 hr) 100%*3 solvent, aliphatic 82 Vol., Mobil Oil KK.

Boiling point 155-197℃, aniline point 56℃, specific gravity ('1
0.778 Example 2 Hytic E-433N”4 10wt% Toray Silicone 5H2003,0*5 5 #Exxon Orderless Solvent*6 40 l water
43 1 Nodipole 60*7 21*4 Eastman Keokal Co. (USA) polypropylene wax (lipropylene, melting point 157°C, penetration 1.0,
Acid value 45) is emulsified in 0/w type emuldigon using a nonionic surfactant, effective solid content 30 wt%, manufactured by Toho Chemical Industry KK *5 dimethylpolysiloxane, Tone.
Silicone KK, viscosity 3csSn=4-5, volatile content 10
0% *6 solvent, aliphatic 100Vo1%, Exxon Chemical K
K.

Boiling point 163-295℃, aniline point 87℃, specific gravity 0.7
6 *7 Emulsifier, polyoxyethylene nonylphenol ether HLB 10.9, Sanyo Chemical Industries KK Example 3 Hytic E-4A: 15wt% Torre Silicone 5I (2005,0*94 Water
78 110
0 I *8 AC polyethylene 392 from Allied (USA)
Melting point 138°C, penetration <0.5, acid value 28) emulsified in 0/Wffi emuldigon with anionic surfactant, effective solids content 35wt%, manufactured by Toho Chemical Industry KK *9 Dimethylpolysiloxane, Tone・Silicone K
K, viscosity 5esSn=7-8, volatile content 100%*10 emulsifier, 1:2 coconut oil fatty acid jetanolamide, oil fine chemical KK Example 4 Varico Polywax 2000*11 3wt%
Shin-Etsu Silicone KF 96L 5 7wt *Tore Silicone 5R2003,08# Shell LAWS
*12 72° carnauba wax
101 *11 Polyethylene, Petrolite (USA), melting point 125°C, penetration 0.5, acid value 0 *12 Solvent, aliphatic 70.5 Vo1%, -7 El Chemical K
K.

Boiling point 155.5-196°C, aniline point 44.4°C, specific gravity 0.796 Example 5 Hytic E-433N6wt Chitone Silicone 5H2003,07,5FIP Solvent 1620*13 40° Water
30 I Bequistwax S jetanolamine 14 (10:3)
6.5 110
0 I *13 Solvent, aliphatic 99.8 Vo 1 '4, Idemitsu Petrochemical KK.

Boiling point 166-208℃, aniline point 79℃, specific gravity 0.7
62 *14 Emulsifier, montanate amine soap *15 Abrasive,
Diatomaceous earth powder, Eagle Pitcher (USA), average particle size 2.0 μm Example 6 Hytic E-4B*16 7wt% Shin-Etsu Silicone KF96L5 5# Veganur 304
0 30 water
32 Alkylbenzenesulfonic acid neutralized product DBT 40*172I BASF Wax E*1821 Radio 2nd light f: 19 1Q z Satinton White Chick, (Xi20 16 Ethylene glycol 2100 l *16 Allied AC polyethylene a 92 (m ) emulsified in O/W type emulsion with nonionic surfactant, effective solid content 40wt%, Toho Chemical Industry KK
*17 emulsifier, alkylbenzenesulfonic acid 1. ) Ethanol agin salt, Lion KK *18 blocking agent, Montan ester wax,
BASF (West Germany) *19 Abrasives, silica flux calcined products, Showa Kagaku Kogyo KK.

Average particle size 4.3 μm *20 Calcined kaolin, Engelhard Co., Ltd. (USA), average particle size 1.4 μm Example 7 Paris-Polywax 2000 5wt Titore・
Silicone 5H2003, 0411P Solvent 162
0 90 1100 l *21 Sumitomo Chemical KK, benzophenone-based Sumithorp 130 Example 8 Hytic E-4A 10 wt%
tore silicone 5h2005,05z water
70wt Thiamizole CD 2.51 Norpetsu 150*22 10゜Caldis C-36
*23 z, s.

100 # *22 Solvent, aromatic 98.7Vo1%, Exxon Chemical K
K.

Boiling point 188-209°C, specific gravity 0.894*23 Blocking agent, oxidized microcrystalline wax, Betrolite (USA) Example 9 Hoechst Wax PE 130: 3vt Chi-Shin-Etsu Silicone KF 96L 5 3t Veganur 3040 70 1 Sasol Wax HI*2441 70nsolf*25 201100
l *24 Hard paraffin, Sasol Company (South Africa) *25 Solvent, Freon-113, Asahi Glass KK Example 10 Hytic E-433N 6wt% Torre Silicone SH2003,04wt*Exxon Orderless Solvent 35 l Water
'40 l Monoethanolamine oleate f26 (4:1)
2 N Snowf 1:1no 2781 Polymist A-12”51 LPG
20 *26 Emulsifier, oleic acid amine soap *27
Abrasive, diatomaceous earth powder, Johns Manpil Company (USA),
Average particle size 1-2 μm *28 Abrasive, polyethylene oxide, Allied Co., Ltd. (USA!
Comparative Example 1 Hoechst Pli: 130 5wt%
Shin-Etsu Silicone KF963000*2951 Pegan-#
3040 90 1*29 dimethylpolysiloxane, Shin-Etsu Chemical KK.

Viscosity 3000es, 'E=500-600, volatile content 0.
5chi Comparative Example 2 Varico Polywax 500*30 1Qwt% Torre Silicone 5H2005,0101 Pegasol 30
40 80 1100 l *30 Polyethylene, Betrolite (USA), melting point 8
7°C, penetration 7.0, acid value 0 Comparative Example 3 Varico Polywax 500 10wt% Shin-Etsu Silicone KF96 3000 5 #Vegasol 3040 85 1 Comparative Example 4 Carnauba Wax Petrolite C-36 Shin-Etsu Silicone KF96500*31 1P Solvent 1620 10wt% I *31 Dimethylpolysiloxane, Shin-Etsu Chemical KK.

Viscosity 500essE=200-300. Volatile content 0.5%
Comparative example 5 BAS F wax E'X32 3.5
wtT.

Tone Silicone 5H200350*3381 Exxon Orderless Solvent 36# Water
36 l Hoechstwax S jetanolamine salt (10:3)
6.5# Satinton White Texts 10 100 I *32 Montan Ester Wax, BASF (West Germany)
, melting point 76-78℃, penetration rate 1, acid value 10-20 *33 Dimethylpolysiloxane, Tone Silicone K
K, viscosity 350 cas H=180-220%
Volatile content 0.5% Comparative Example 6 Varico Polywax 2000 10wtI%IP
Nrubento 1620 90 #100w
t Chi Comparative Example 7 High Chick E-4B 10wt Chi Shell LAWS 50 1 water
48 L Noni Ball 60 2 T Comparison 918 Shin-Etsu Silicone KF 96 L 5 15wt%
water
80 I Amizole CD 5
Manufacturing method (1) Manufacturing method of Example 1.4.7.9 and Comparative Example 1.2.3.4.6 Polyolefin or various wax components and other auxiliary components are added to each solvent and heated to about 125°C. Dissolve, then add silicone and cool to room temperature. When using a solvent with a low boiling point, add it after cooling to room temperature.

Manufacturing method (manufacturing method for Katana Example 2.3 and Comparative Example 7.8) First, a surfactant is dissolved in water.While stirring with a homo mixer (manufactured by 4I Shokika Kogyo KK), silicone is added to the solvent. emulsify and disperse the wax emulsion into the emulsion while stirring.
Ru.

In addition, in Example 3 and Comparative Example 8, it was difficult to emulsify and disperse the silicone, so by emulsifying with a suitably small amount of water to dissolve the surfactant and diluting with the water removed, a uniform silicone can be obtained. Emulsion is obtained.

Manufacturing method (3) Manufacturing method of Example 10 First, monoethanolamine is dissolved in water.

Add silicone and oleic acid dissolved in a solvent to this while stirring with a homomixer to make oleic acid amine soap and at the same time make a uniform emulsion. While stirring, the wax emulsion is dispersed therein, and the abrasives are further dispersed in order to obtain a uniform emulsion. This is filled together with an aerosol container KLPG to form an aerosol 80.

Manufacturing method (4) Manufacturing method of Example 6.8 First, a surfactant is dissolved in water and heated to about 80°C. A mixture of wax components and silicone dissolved in a solvent heated to about 80° C. is added to this mixture while stirring with a homomixer, and emulsified. Next, a wax emulsion is dispersed therein. Thereafter, the auxiliary ingredients are sequentially added and the mixture is cooled to room temperature.

Manufacturing method (5) Manufacturing method of Example 5 and Comparative Example 5 First, jetanolamine is dissolved in water, and an abrasive is dispersed therein, followed by heating to about 80°C. While stirring with a homomixer, a solution of silicone and Hoechst Wax S heated to about 80° C. is added to a solvent, and emulsified at the same time as making montanate amine soap. The wax emulsion is dispersed in this and cooled.

Test items (1) Resistance to stains (2) Ease of stain removal (3) Persistent non-staining effect (4) Persistent effect of gloss (5) Removal of staining film Test method 60 year model A white Toyota Tercel car will be prepared as a test vehicle. Wash your car and apply cleaner wax to remove dirt. The remaining cleaner wax coating components are removed using an aliphatic solvent. This roof section is divided into 20 sections, and each sample is applied to each section. Only two sections will be left uncoated for blank testing.

Spraying method and test procedure First, collect an appropriate amount of sample onto a creta/sponge and spread it over the test section. Air dry for about 15 minutes to volatilize the solvent in the sample and allow the active ingredient to adhere. A final wipe is then performed with a KSi clean cotton towel to obtain a glossy surface and form a test coating. This test vehicle will be parked outdoors. The test unit is one week, during which time the vehicle travels approximately 100 hours. This one
Wash with water once per unit. The following test items will be tested and evaluated using this test procedure. The test period is 3 months.

(1) Resistance to dirt The state of dirt coverage before washing with water is visually evaluated in comparison with a blank test area to which no sample is applied.

First, the results are shown for one unit.

◎...There is less dirt coverage than the blank test part ○...The same level of dirt as the blank test part Δ...The blank test part is dirtier ×...It is extremely dirty and unsightly (2) Ease of stain removal After completing the evaluation test (1), use a urethane sponge to wash the test area of the roof uniformly with water, then drain with a clean cotton towel to remove any remaining stains. Visually evaluate the state in which the weight has fallen by comparing it with the blank test part.The average tendency of 5 units is shown at first.

◎... Most of the dirt comes off cleanly O... The dirt comes off more easily than the blank test part Δ... The dirt is the same as the blank test part ×... It is dirtier than the blank test part (3) Continuous effect of staining The test is continued for 3 months, and the period until the stain becomes noticeable even after washing with water is visually evaluated on a weekly basis.

(4) In the same way as in (3), the duration of gloss is evaluated with the naked eye in weeks until the gloss disappears.

(5) Removability of contaminated film After completing a three-month test, it was determined whether the contaminated film could be removed with a general cleaner wax.

◎・・・There is little dirt and dirt can be easily removed O...
Dirt is easier to remove than the blank test partΔ...Stain removal performance is equivalent to the blank test part×...Test result that dirt is more difficult to remove than the blank test partHowever, the following inconveniences may occur. There is.

Comparative Example 6 Wiping is poor, it is difficult to obtain a uniform glossy surface, and a thick residue remains.

Comparative Example 7 Wiping is poor, it is difficult to obtain a uniform glossy surface, and thick residue υ
are doing.

Comparative example 8 It is difficult to obtain a smooth, glossy surface due to the sticky coating.

Also, it is not water repellent and is therefore unsuitable as a car wax.

"Effects of the Invention" The composition of the present invention provides a thin film of hard polyolefin to the paint film of an automobile, and this polyolefin film exhibits an excellent effect of protecting the paint film of the car from natural pollution. .

Claims (1)

[Scope of Claims] An antifouling agent for automobile paint films, characterized by containing the following components A, B, and C. A, Melting point: 110℃ or higher, Penetration: 1.5dmm or lower (JI
SK2530), hard polyolefin with an acid value of 50 or less
．． 5-20.0wt% B, linear dimethylpolysiloxane 0.5-30.0wt% represented by the general formula [I] below ▲There are mathematical formulas, chemical formulas, tables, etc.▼[I] @n@=2~ 10C, any of the following solvents (a) to (c) 50 to 99w
t% (a) A solvent mainly consisting of an aliphatic or aromatic solvent with a boiling point of 150 to 300°C (b) Water containing an emulsifier capable of emulsifying the above A and B components (c) The above (a) and (b) mixture of