CN103980761B - A kind of ABS plastic paint remover and stripping method thereof - Google Patents

Abstract

The invention discloses a kind of ABS plastic paint remover and stripping method thereof, this paint remover is for main solvent with the mixed solution of phenylcarbinol and butylacetate, take hydrogen peroxide as solubility promoter, be aided with Sodium dodecylbenzene sulfonate simultaneously, Walocel MT 20.000PV, paraffin, deionized water is composite to be formed, low toxicity, safety and environmental protection, during use, first ABS plastic is used acetic acid ultrasonic cleaning, and then use paint remover ultrasonic cleaning, whole process does not need heating, paint stripping rate is fast, can be recycled, can be used for the paint film removing shades of colour and kind, as epoxy-based lacquers, alkyd paint, acrylic paint, polyurethane paint etc., and the degree of injury that can reduce to greatest extent ABS plastic.

Description

A kind of ABS plastic paint stripper and paint stripping method thereof

technical field

The invention belongs to the technical field of coatings, and in particular relates to a paint remover for ABS plastic substrates and a usage method.

Background technique

ABS plastic is an engineering plastic with wide application, large consumption and low price. Because it is easy to process, and the product is extremely stable, it has good impact resistance and heat resistance, so it is widely used in automobiles, electronic appliances, etc. When in use, paint is often sprayed to achieve the purpose of protecting the substrate and beautifying the appearance. During the use of paint, the coating will be damaged or gradually aged. It is necessary to completely remove the old or damaged coating before spraying, otherwise it will affect the quality of the coating film after the workpiece is recoated. Surface pretreatment process before painting. In order to save resources, the old paint film that has been scratched or weathered on the ABS plastic surface is removed, and then repainted and put into use.

There are two ways to remove the old paint film, physical and chemical. Physical methods include flame method, sand blowing method, sand grinding method, etc. However, it has a damaging effect on plastics and is more harmful to the substrate. The chemical method is to use a paint remover to remove the paint film. The paint removal principle of the paint remover is realized through a series of physical and chemical processes such as dissolution, penetration, swelling, peeling and reaction according to the principles of "like dissolves like" and "similar solubility parameters". Commonly used paint removers can be acidic paint removers, hot alkaline paint removers, and solvent-based paint removers according to their composition. Acidic paint stripper mainly contains concentrated sulfuric acid, which has a good stripping effect on metal paint films, but has relatively high requirements for operational safety and equipment sealing, and is not suitable for stripping ABS plastic substrates. Alkaline paint strippers generally contain sodium phosphate, sodium silicate, caustic soda, etc. The paint stripping time is generally longer, and they are highly corrosive to the substrate and require heating. Solvent-based paint remover is currently the most widely used type of paint remover on the market. It is generally composed of main solvents, co-solvents, thickeners, and volatile inhibitors. At present, the chemical paint strippers used in industry usually contain more dichloromethane, phenol, volatile solvents and other harmful substances, which cause the paint strippers to be more volatile and toxic, and to corrode the substrate. The reactivity is very large, which greatly reduces the recovery rate of the substrate.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of existing paint strippers, and to provide a low-volatility, low-toxicity or non-toxic, non-toxic, The substrate is safe, harmless to operators or the environment, does not need to be heated during use, has a fast paint removal speed, and is a recyclable ABS plastic paint remover, as well as a method for using the paint remover.

The technical solution adopted to solve the above problems is that it is made of the raw materials of the following mass percentage ratios:

Above-mentioned ABS plastic paint stripper is preferably made of the raw material of following mass percentage ratio:

The above-mentioned main solvent is a mixture of benzyl alcohol and butyl acetate, wherein benzyl alcohol is 60wt.% to 80wt.%, butyl acetate is 20wt.% to 40wt.%, preferably benzyl alcohol is 74wt.% to 80wt.%. , Butyl acetate is 20wt.%～26wt.%.

The preparation method of the above-mentioned ABS plastic paint remover is as follows: according to the mass percentage ratio of the above-mentioned raw materials, benzyl alcohol and butyl acetate are mixed evenly, and then hydrogen peroxide, sodium dodecylbenzenesulfonate, hydroxymethyl cellulose and Deionized water, stirring evenly, and finally adding paraffin to seal the surface to prevent solvent volatilization, to obtain ABS plastic paint remover.

The method of using the paint remover for ABS plastics is as follows: soak the ABS plastics in acetic acid, ultrasonically wash them for 5-10 minutes, then soak them in the ABS plastic paint removers, and ultrasonically wash them for 10-15 minutes.

The paint remover of the present invention does not contain methylene chloride, is safe and environmentally friendly, does not need heating when used, and can be used to remove paint films of various colors and types, such as epoxy paint, alkyd paint, acrylic paint, polyurethane paint, etc. , and can minimize the damage to ABS plastics, so that the paint remover has the advantages of fast paint removal speed, low toxicity, low volatility, and recyclable use.

Detailed ways

The present invention will be further described in detail below in conjunction with the examples, but the protection scope of the present invention is not limited to these examples.

Example 1

Taking the preparation of ABS plastic paint remover 1000g of the present invention as an example, the raw materials are composed as follows:

Its preparation method is: mix 408g of benzyl alcohol and 102g of butyl acetate evenly, then add 150g of hydrogen peroxide, 80g of sodium dodecylbenzenesulfonate, 40g of hydroxymethyl cellulose and 200g of deionized water in sequence, stir evenly, and finally add 20g of paraffin is used to seal the surface layer to prevent solvent volatilization to obtain ABS plastic paint remover.

Example 2

Taking the preparation of ABS plastic paint remover 1000g of the present invention as an example, the raw materials are composed as follows:

Its preparation method is identical with embodiment 1.

Example 3

Taking the preparation of ABS plastic paint remover 1000g of the present invention as an example, the raw materials are composed as follows:

Its preparation method is identical with embodiment 1.

Example 4

Taking the preparation of ABS plastic paint remover 1000g of the present invention as an example, the raw materials are composed as follows:

Its preparation method is identical with embodiment 1.

Example 5

Taking the preparation of ABS plastic paint remover 1000g of the present invention as an example, the raw materials are composed as follows:

Its preparation method is identical with embodiment 1.

Example 6

Taking the preparation of ABS plastic paint remover 1000g of the present invention as an example, the raw materials are composed as follows:

Its preparation method is identical with embodiment 1.

Example 7

Soak the ABS plastic in acetic acid, ultrasonically wash it for 5 minutes, then take it out, soak it in ABS plastic paint remover, and ultrasonically wash it for 15 minutes.

According to the national standard HG/T2881-1997 "Determination of Paint Stripping Efficiency of Paint Strippers", the paint stripping efficiency of the paint stripper (that is, the area percentage of the paint film swelling and wrinkling within the specified time) is measured. The formula for calculating the stripping efficiency is as follows:

The test results are shown in Table 1.

The paint stripping efficiency of table 1 paint remover of the present invention

paint remover Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Paint removal efficiency 90% 75% 80% 75% 70% 80%

In order to determine the best raw material proportioning of the present invention, inventor has carried out a large amount of laboratory research experiments, and various test conditions are as follows:

1. Selection of main solvent and co-solvent

Select different co-solvents (15g) and main solvents (50g) respectively, see Tables 2-4 for details, then mix 8g sodium dodecylbenzenesulfonate, 4g hydroxymethyl cellulose, 2g paraffin and 20g deionized water, Compound solvents with solubility of 9.0, 10.0 and 11.0 were formulated. According to the method of Example 7, the ABS plastic substrate was stripped of paint, and the test results are shown in Tables 2-4.

The influence of table 2 main solvent and cosolvent on stripping effect

It can be seen from Table 2 that under the three different conditions of composite solvent solubility of 9.0, 10.0, and 11.0, when the mixed solution of benzyl alcohol and butyl acetate is used as the main solvent and hydrogen peroxide is used as the auxiliary solvent, the paint removal effect is relatively good. When the solvent solubility is 11.0, benzyl alcohol accounts for 71% and butyl acetate accounts for 29% in the main solvent, the paint removal effect is the best, and about 80% of the paint film can be removed within 15 minutes, and the damage to the substrate is minimal .

The influence of table 3 main solvent and cosolvent on stripping effect

As can be seen from Table 3, the mixed solution of dimethyl sulfoxide, ethylene glycol monobutyl ether, and isopropanol as the main solvent cannot be formulated into a composite solvent with a solubility of 9.0. Under the two different conditions of main solvent solubility of 10.0 and 11.0, respectively, acetic acid, hydrogen peroxide, and phenol were used as auxiliary solvents, and the paint removal effect was poor.

The influence of table 4 main solvent and cosolvent on stripping effect

As can be seen from Table 4, acetic acid, hydrogen peroxide, and phenol are used as cosolvents respectively, and the mixed solution of xylene and n-butanol is used as the main solvent. Under the three different conditions of main solvent solubility of 9.0, 10.0, and 11.0, the paint removal effect is obviously not enough ideal.

Based on the above tests, the present invention selects the mixed solution of benzyl alcohol and butyl acetate as the main solvent, and hydrogen peroxide as the auxiliary solvent.

2. Determine the ratio of benzyl alcohol and butyl acetate

Adopting hydrogen peroxide (15g) is cosolvent, and the mixed solution of benzyl alcohol and butyl acetate is main solvent (50g), mixes 8g sodium dodecylbenzene sulfonate, 3g hydroxymethyl cellulose, 2g paraffin and 20g desulphate then Ionized water, compound solvents with solubility of 10.5, 10.7, 10.9, 11.0, 11.2, 11.5 respectively, see Table 5 for details. The ABS plastic was ultrasonically washed in acetic acid for 5 minutes, then soaked in a complex solvent, and ultrasonically washed for 15 minutes. The test results are shown in Table 5.

The impact of table 5 benzyl alcohol and butyl acetate ratio on the paint stripping effect

It can be seen from Table 5 that the paint removal effect is better when the solubility of the composite solvent is in the range of 10.5 to 11.5, and at least half of the paint film can be removed within 15 minutes. When the solubility of the composite solvent is 11.0 to 11.5, the paint removal effect is better. Well, so the main solvent of the present invention is preferably composed of 74wt.%-80wt.% benzyl alcohol and 20wt.%-26wt.% butyl acetate.

3. Determination of paint removal method

Scheme 1: Take two black, red, blue and yellow paint flakes, soak them in the paint remover prepared in Example 1, and stir them at a constant speed for 15 minutes.

Scheme 2: Take two black, red, blue and yellow paint flakes, soak them in acetic acid for 5 minutes, then soak them in the paint remover prepared in Example 1, and stir for 15 minutes.

Option 3: Take two black, red, blue, and yellow paint flakes, first ultrasonically wash them in acetic acid for 5 minutes, and then ultrasonically wash them with the paint remover prepared in Example 1 for 15 minutes.

Scheme 4: Take two black, red, blue, and yellow paint flakes, first ultrasonically wash them in acetic acid for 10 minutes, and then ultrasonically wash them with the paint remover prepared in Example 1 for 20 minutes.

The test results show that the paint removal effect of scheme 3 is the best, and the thinner paint flakes of the paint film can be completely removed by ultrasonic washing in acetic acid for 5 minutes, and then the paint remover prepared in Example 1 can be removed by ultrasonic washing for 15 minutes. It can remove the paint flakes with a thicker paint film that has not been taken off, and the damage to the ABS plastic substrate is very small. However, the paint stripping time in Scheme 4 is too long, and the damage to the base material is relatively large, so it is not adopted.

In order to prove the beneficial effects of the present invention, the inventor used the paint remover of Example 1 to remove paint from different types of paint films according to the method of Example 7, and the test results are shown in Table 6.

The ABS plastic paint stripper prepared by the embodiment 1 of table 6 is to the paint stripping efficiency of different paint films

Type of paint film Polyurethane resin Acrylic Polymethylmethacrylate epoxy resin Alkyd resin Paint removal efficiency 100% 100% 95% 95% 98%

As can be seen from Table 6, the paint remover of the present invention is not only highly efficient to the removal of paint films on ABS plastics, but also can effectively remove other various paint films, and the test results show that it has no effect on the substrates of paint films of other various color types. No obvious corrosion phenomenon.

Claims (2)

1. an ABS plastic paint remover is characterized in that it is made from the raw material of following mass percentage ratio: The above-mentioned main solvent is a mixed solution of benzyl alcohol and butyl acetate, wherein the benzyl alcohol is 74wt.%-80wt.%, and the butyl acetate is 20wt.%-26wt.%. 2. A method for removing paint using the ABS plastic paint remover of claim 1, characterized in that: the ABS plastic is soaked in acetic acid, ultrasonically washed for 5 to 10 minutes, then soaked in the ABS plastic paint remover, ultrasonically washed 10-15 minutes.