FI20216198A1

FI20216198A1 - Method for repairing damaged paint surfaces and composition for use in the method

Info

Publication number: FI20216198A1
Application number: FI20216198A
Authority: FI
Inventors: Patrik Westerback
Original assignee: Pate West Ky
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2023-05-25
Also published as: FI130733B1

Abstract

The object of the invention is a method for repairing paint damages, such as scratches, chips and blemishes on vehicles. In the method, the surface to be painted is cleaned, alkyd paint is added by use of a flexible spreading device having at least one flexible continuous edge, such as a rubber or silicone spreader, whereby the damage is filled with alkyd paint and excessive paint is removed by use of the flexible spreading device. The surface is then left to dry for up to 45 minutes, after which alkyd paint present outside the painted damage and above the level of the surrounding paint surface is removed by use of a paint removal composition comprising organic solvent and d-limonene in an amount of 5–40 vol-% and a polishing device, such as a cloth. Paint removal composition present on the surface is removed and the surface is dried. A further object of the invention is an alkyd paint removal composition suitable for use in the method.

Description

METHOD FOR REPARING DAMAGED PAINT SURFACES AND COMPOSITION

FOR USE IN THE METHOD

Object of the Invention

The present invention relates to a method for repairing damaged paint surfaces and an alkyd paint removal composition for use in the method.

Background of the Invention

The paint surface of vehicles is easily damaged by sharp objects, and especially — small pieces of stone present on the road or studs coming off winter tires and hit- ting the painted surface at high speed, such that paint chips are formed. This kind of damages to the paintwork often have a relatively small cross-section, but may be relatively deep extending all the way to the body panel through the paint layers.

Such damages make the body panel prone to corrosion and will also have a nega- tive effect on the overall appearance of the vehicle.

Repairing a damaged paint surface is often a demanding job, and it is very difficult to achieve an unnoticeable result without repainting the entire surface. Repainting, on the other hand, is often more expensive than repairing and may also lead to a slight difference in color between two adjacent sections, especially if only part of the vehicle is painted. Furthermore, there is a risk that the repainted surface is not as durable or otherwise ages differently than the original paintwork. Several kinds of repair kits for paint surfaces of vehicles are available on the market, both intended for professional use and for do-it-yourself purposes. One example is touch up sticks, _ 25 — which basically comprise a thin brush or plastic stick, which can be used to fill up

O the damaged spot with paint. This may be used for the primer base, the base color = coat and the clear coat or only the base color coat and the clear coat. There might s be a need to apply several layers of paint depending on the depth of the damage in

I the paintwork. This requires multiple drying steps, the length of which depends on > 30 the recommendations of the paint manufacturer. Once the paint is dried, it might be & left without further treatment or finalized by water polishing or similar methods. = Paint extending over the edges of the repaired scratches, chips or blemishes is usu-

N ally not removed using such traditional methods. The surface of the painted scratches, chips or blemishes will thus be slightly above the level of the surrounding, original paint surface. This will make the repaired areas more easily noticeable. There are also other methods known in the art, where paint is applied by flexible spreading devices, such that the damaged spot is filled with paint or pre- paratory coating. In these methods, removal of excess paint without damaging the original paintwork is often demanding and time consuming.

There is still a need on the market for a method making quick repair of damaged paint surfaces possible without a negative impact on the overall appearance of the painted surface.

Description of the Invention

The present invention relates to a method for repairing damaged paint surfaces as well as an alkyd paint removal composition suitable for use in the method. The pre- sent invention is designed especially for repairing scratches and stone chips present on the paint surface. Also, other smaller damages caused by sharp objects, such as studs coming of winter tires and hitting the painted surface at high speed, may be repaired by use of the method of the invention.

The term paint surface is within this application referring to any of or all separate layers comprised in a final painted surface, /.e. the paintwork, of a car or other vehi- cle. The paint surface may thus comprise a primer base, a base color coat or a clear coat, as well as any other coat layers possibly present in the original paintwork or layer added post-manufacturing.

S 25 — The paint surface to be repaired should be clean and dry. A polyester paint in a < color matching the original color of the vehicle is chosen for the repair of the dam- 3 ages. The damaged surface is filled with polyester paint, preferably by use of a rub- - ber spreader, such that the damage, for example a scratch or stone chip, is filled

E with paint. The paint is left to dry, and any excess paint is carefully removed around & 30 the painted damage by use of a paint removal composition comprising D-limonene = and organic solvent applied to a polishing or spreading device, for example a single

N use cloth, such that paint remains only within the volume of the damage, where original paint has come off. Paint removal composition left on the surface is washed away or swept off, for example by use of a microfiber cloth, and the surface is dried. The alkyd paint removal composition of the present disclosure is not damag- ing or removing the original paint, as it only reacts with the alkyd paint not yet fully cured.

The method of the present disclosure in combination with a cleaning agent compo- sition suitable for removal of alkyd paints provides an alternative to conventional painting methods. An even result and a smooth surface of high-quality is obtainable by the method of the present disclosure. When the coloring agent is chosen with care, such that it essentially matches the original color of the painted surface, the result is unnoticeable. In comparison to many conventional methods, the method is quick and cost-effective. The cleaning agent composition does not cause damage to the original paintwork in the method of the present disclosure.

Summary of the Invention

The object of the invention is a method for repairing paint damages, such as scratches, chips and blemishes on vehicles. In the method, the surface to be painted is cleaned, alkyd paint is applied using a flexible spreading device having at least one flexible continuous edge, such that the damage is filled with alkyd paint and excessive paint is removed by use of the flexible spreading device. Preferably, the spreading device used is a rubber or silicone spreader. The surface is left to dry for up to 45 minutes after which alkyd paint present outside the painted damage and above the level of the surrounding paint surface is removed by use of a paint removal composition comprising organic solvent and d-limonene in an amount of 5- = 25 40 vol-% and a polishing device, such as a cloth. Composition of the previous step

N present on the surface is removed and the surface is dried. The paint damage to be - repaired may be up to 1 cm wide. Preferably, the alkyd paint comprises alkyd resin

N as binder in an amount of 30-40 weight-%. A paint removal composition comprising

E d-limonene in an amount of 10-25 vol-% is preferred for removal of excess alkyd © 30 paint, even more preferred is a paint removal composition comprising d-limonene in © an amount of 12-15 vol-%. Furthermore, the paint removal composition used to re-

N move excess polyester paint preferably comprises Ci11—Cis hydrocarbons, n-alkanes

N and iso-alkanes as organic solvent.

In a preferred embodiment of the invention, the alkyd paint is left to dry for 3-30 minutes prior to removal of excess paint by use of the paint removal composition comprising organic solvent and d-limonene. Preferably the drying time can be 5-20 minutes and even more preferably 5-10 minutes.

Another object of the invention is a composition for removal of alkyd paint, wherein the paint removal composition comprises organic solvent and d-limonene in an amount of 5-40 vol-%. Preferably the paint removal composition comprises organic solvent and d-limonene in an amount of 10-25 vol-%, even more preferably in an amount of 12-15 vol-%. In a preferred embodiment, the paint removal composition comprises d-limonene in an amount of 10-20 % and organic solvent in an amount of 80-90 vol-%. The paint removal composition may, for example, comprise C11—C16 hydrocarbons, n-alkanes and iso-alkanes as organic solvent.

Drawings

The method of the invention is further described with reference to Figure 1, pre- senting the steps of the method of the invention.

Detailed Description of the Invention

The surface to be painted should be clean and dry. Thereby, the process includes a preparatory cleaning step, preferably performed using technigues and agents known in the art. The cleaning may include steps comprising removal of rust, grease and/or silicon present on the surface. The damaged surface to be painted should also be essentially free from dust and other loose material. Thus, the preparatory - 25 — cleaning is preferably performed or finalized using a lint-free cloth.

S

= The scratches, chips and/or blemishes present on the cleaned surface are then filled s with polyester paint, preferably alkyd paint. A fast-drying alkyd resin binder has

I been found especially beneficial as paint base in the method of the present inven- > 30 tion. Especially preferable is a paint composition comprising alkyd binder in a solid & content of 30—40 weight-%, the rest being pigmented base and solvent. The alkyd = resin paint shows good adhesiveness and can be effectively and selectively removed

N by use of a paint removal composition according to the present disclosure compris- ing d-limonene and organic solvent.

The polyester paint is preferably applied using a spreading device having at least one continuous and flexible edge, such as a rubber or silicone spreader. The spreading device used is preferably 2-8 cm wide, more preferably 4-6 cm wide. The aim is to fill scratches, chips, blemishes or other damages on the original paintwork 5 — with the polyester paint. The paint may also be applied using alternative application methods known in the art, whereby the flexible spreading device is used only to re- move excess paint. The amount of paint used should be sufficient to fill the dam- aged spot up to the level of the intact surface, but preferably not in amounts leav- ing strands of excess paint on the surface along the edges of the spreading device.

Paint damages up to 1 cm in width may be repaired by the method of the present disclosure. A thin, even layer of excess paint will be present on the original paint surface after the polyester paint has been applied. The paint is left to dry such that it becomes semi-dry without being fully cured. The drying time should not be more than 45 minutes. Preferably the drying time is 3-30 minutes, even more preferably 5-20 minutes. A drying time of 5-10 minutes has been found especially preferable.

After the polyester paint has dried, the excess paint is carefully removed around the damaged spot, such that the paint applied in the previous step is left only within the damage, such as a scratch or chip, up to the level of the surrounding paint surface.

This step is carried out by use of a paint removal composition comprising an organic solvent and D-limonene. Preferably, the solvent is paint thinner suitable to thin oil- based paint, such as solvents used by artists. A solvent comprising C11—Cis hydro- carbons, n-alkanes and iso-alkanes has been found especially preferable. The ratio of D-limonene to solvent is preferably from 2:3 to 1:19. The amount of D-limonene in the paint removal composition may thus be at least 5, 10 or 15 vol-% and up to _ 25 15, 20,25, 30, 35 or 40 vol-%. Especially preferred is an amount of D-limonene of

O 10-20 vol-%, in particular 12-15 vol-%. The amount of solvent may thus be from = 60, 65, 70, 75, 80, 85 vol-% up to 85, 90 or 95 vol-%. Especially preferred is an s amount of solvent of 80-90 vol-%, in particular 88-85 vol-%. The paint removal

I composition is preferably applied by use of a cloth, such as a wood fiber or polyes- > 30 — ter cloth. It may also be performed by use of a polishing pad or other spreading de- & vice having a similar structure suitable for collecting excess paint from the surface. 5 If the color of the painted spot is not completely matching the color of the sur-

N rounding paintwork, it may be slightly changed by adding pigment to the paint or by blending one or more paints of different color. Paint removal composition present on the surface is finally removed and the surface is dried, preferably by use of a dry cloth or polishing device, for example, a soft and relatively thick cloth such as a mi- crofiber cloth.

Examples

The paint surface to be treated was cleaned by conventional cleaning method in- cluding rinsing, wash using general car wash cleaning agent, rinsing and drying fi- nalized using a soft lint-free cloth. An alkyd resin paint from Roberlo (DISOLAC®

Binder SINT 700-G (80%), DISOLAC pigmented base (20%) and thinner (0-30%)) was applied to a rubber spreader. Several stone chips were filled with paint, either in one stroke or in individual strokes. Special care was taken to fill the chips up to the same level as the original paint, leaving no paint reserves on the surface other than a thin, even layer. The painted surface was left to dry for 5-10 minutes. A blend of 85 % thinner (HanArt) and 15% d-limonene was prepared. The thinner used comprised hydrocarbons C11-Cie, n-alkanes and isoalkanes. The blend of thin- ner and d-limonene functioning as paint removal composition was applied to a sin- gle use cloth (Carita® Original, Fredman) and excess paint was gently removed from the painted surface that had dried for 5-10 minutes. Special care was taken not to remove too much paint from the stone chips, such that the surface was completely — smooth after treatment with the paint removal composition for alkyd paint. Once the surface was smooth, meaning that the chips were filled with added paint and any excess paint was removed from the original paint surface between the chips, the surface was swiped dry from paint removal composition by use of a thick micro- fiber cloth (polyester/polyamid). _ 25

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Claims

1. Method for repairing paint damages, such as scratches, chips and blemishes on vehicles, wherein: -the surface to be painted is cleaned, - alkyd paint is applied using a flexible spreading device having at least one flexible continuous edge, such that the damage is filled with alkyd paint and excess paint is removed by use of the flexible spreading device, - the surface is left to dry for up to 45 minutes, - alkyd paint present outside the painted damage and above the level of the sur- rounding paint surface is removed by use of a composition comprising organic sol- vent and d-limonene in an amount of 5-40 vol-% and a polishing device, such as a cloth, - composition of the previous step present on the surface is removed and the sur- — face is dried.

2. Method according to claim 1, wherein the flexible spreading device is a rubber or silicone spreader.

3. Method according to claim 1 or 2, wherein the paint damage is up to 1 cm wide.

4. Method according to any of the preceding claims, wherein the alkyd paint com- prises alkyd resin as binder in an amount of 30-40 weight-%. _ 25 —

5. Method according to any of the preceding claims, wherein the composition used O to remove excess alkyd paint comprises d-limonene in an amount of 10-25 vol-%.

s

6. Method according to any of the preceding claims, wherein the composition used I to remove excess alkyd paint comprises d-limonene in an amount of 12-15 vol-%. jami > 30 00

D

7. Method according to any of the preceding claims, wherein the composition used O N to remove excess polyester paint comprises C11-Cie hydrocarbons, n-alkanes and N iso-alkanes as organic solvent.

8. Method according to any of the preceding claims, wherein the surface is left to dry for 3-30 minutes, preferably 5-20 minutes and even more preferably 5-10 minutes prior to removal of excess paint by use of the composition comprising or- ganic solvent and d-limonene.

9. Alkyd paint removal composition, wherein the composition comprises organic sol- vent and d-limonene in an amount of 5-40 vol-%.

10. Composition according to claim 9, wherein the composition comprises organic solvent and d-limonene in an amount of 10-25 vol-%.

11. Composition according to claim 9 or 10, wherein the composition comprises or- ganic solvent and d-limonene in an amount of 12-15 vol-%.

12. Composition according to claim 9, wherein the composition comprises d-limo- nene in an amount of 10-20 % and organic solvent in an amount of 80-90 vol-%.

13. Composition according to any one of claims 9-12, wherein the composition comprises C11-Ci6 hydrocarbons, n-alkanes and iso-alkanes as organic solvent. N O N + N I jami o 00 o © N O N