JPS62265146A - Coating agent for scratch on glass vessel - Google Patents

Abstract

PURPOSE:To obtain the titled coating agent forming a coated film which is excellent in masking properties and water resistance and is free from surface tackiness and slipping and is not allowed to flow by dewing formed on the surface of glass by using a reaction product of two kinds of specified compds. as essential component. CONSTITUTION:100pts.wt. compd. shown in a formula RSi(OR')n (R is methyl, ethyl, dimethyl and methylethyl, R' is 1-4C alkyl, (n) is 2 and 3) is allowed to react with 5-300pts.wt. compd. shown in the formula Si(OR')4 in the presence of dilute acid such as 0.1-0.01N hydrochloric acid, sulfuric acid and sulfonic acid, and thereby a coating agent for a scratch on a glass vessel which consists of the reaction product is obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a scratch coating agent for glass containers such as fruit juice bottles, soft drink bottles, beer bottles, etc., and in particular, the present invention relates to a scratch coating agent for glass containers such as fruit juice bottles, soft drink bottles, and beer bottles. The present invention relates to a scratch coating agent for glass containers that does not wash away, has good shielding properties, and whose coating film is easily removed during the bottle washing process.

[Prior art and its problems]

Currently, glass containers such as fruit juice bottles, soft drink bottles, and beer bottles are collected after use and used repeatedly. This results in a loss of appearance and a decrease in product value.

For this reason, in recent years, various types of coating agents have been applied to the surface of glass containers to cover the scratches and protect the aesthetic appearance of the glass containers.

Conventionally, emulsions or aqueous dispersions containing liquid paraffin or silicone oil as main components have been known as coating agents of this type.

However, these not only have poor shielding properties due to the paint film being washed away by condensation, but also become sticky and slippery after application, resulting in poor tactility and the risk of the container slipping from the hand. Moreover, not only does the coating peel off in cold water or in a showcase, resulting in poor water resistance, but the peeled oil also floats to the surface of the water, or during the bottle washing process, the oil may spill onto the container. There is also the risk that it may re-adhere to the inside and adversely affect the taste.

Cured products of organopolysiloxanes containing phenyl groups are known as coating agents that solve these problems. (Unexamined Japanese Patent Publication No. 55-56040). This type of coating agent improves the various drawbacks mentioned above and can be used successfully when applying to empty containers or filling contents above room temperature. If the coating is applied after the coating has been applied, the temperature difference will cause dew condensation on the surface of the container, and this condensation will cause the coating to peel off and be washed away, resulting in a loss of shielding effect.

Furthermore, this type of coating agent also has the disadvantage that the coating film cannot always be removed sufficiently in a normal bottle washing process.

[Purpose of the invention]

The purpose of the present invention is to improve the various drawbacks of the above-mentioned known techniques, and to provide a structure that is free from stickiness, slippage, and no flakes, has good water resistance, and does not have oil floating when immersed in water. Therefore, it does not adversely affect the quality of the contents, and even when the container is filled with contents at a temperature below room temperature, the film will not be washed away due to condensation, so it has good shielding properties. Moreover, the coating film is easily removed during the bottle washing process. An object of the present invention is to provide a novel coating agent for scratches on glass containers.

[Key points of the invention]

In order to achieve the above-mentioned object, according to the coating agent of the present invention,
It is characterized in that the main component is a reaction product produced by the reaction of the following components (A) and (B).

(A) General formula %formula% (B) General formula 5t(OR')n compound.

100 parts by weight.

However, in the formulas (A) and (B) above, R is methyl, ethyl, dimethyl or methylethyl group,
R' is an alkyl group of CI to c4, and n is 2 to 3
is an integer.

[Detailed description of the invention]

Hereinafter, the present invention will be specifically explained in detail.

The aforementioned component (A), ie, the compound of the general formula R3i (OR')n, is specifically methyltrimethoxysilane or methyltriethoxysilane.

Methyltripropoxysilane, methyltrippoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltripropoxysilane.

Ethyltriptoxysilane, dimethyldimethoxysilane, dimethyljethoxysilane, dimethyljethoxysilane, dimethyljethoxysilane.

Methylethyldimethoxysilane, methylethyljethoxysilane, methylethyldipropoxysilane, methylethyldibroxysilane, methyltriisopropoxysilane, methyltriisobutoxysilane, ethyltriisopropoxysilane, ethyltriisobutoxysilane, dimethyldiiso Propoxysilane, dimethyldiisobutoxysilane.

These include dimethyldiisobutoxysilane, methylethylisopropoxysilane, methylethylisobutoxysilane, and the like.

In addition, the aforementioned component (B), that is, general formula 5i (OR'
Examples of the compound (4) include tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, tetrabutoxysilane, tetraisopropoxysilane, and tetraisobutoxysilane.

The aforementioned components (A) and (B) are 0.1 to 0.01N
easily reacts in the presence of dilute acids such as hydrochloric acid, sulfuric acid, sulfonic acid, and chloroacetic acid to obtain reaction products. The reaction product is an alkylpolysiloxane having an orthosilicate bond, and specifically includes methylpolysiloxane, ethylpolysiloxane, dimethylpolysiloxane, methylethylpolysiloxane, etc. having an orthosilicate bond.

The blending amounts of components (A) and (B) are as follows: component (A)
The amount of component (B) is 100 parts by weight, preferably 10 to 200 parts by weight.

If component (B) is less than 5 parts by weight, the coating film becomes sticky or dust tends to adhere to it, and if it is more than 300 parts by weight, the shielding properties become poor (or water resistance deteriorates).

The above-mentioned coating agent of the present invention can be applied to cloth, sponge, and felt.

It can be applied by hand using a brush or a belt, or by any method such as dipping or spraying.

Hereinafter, the present invention will be specifically explained in detail with reference to Examples.

Example Component (^) and component (B) used in this example are as follows.

(1) Methyltriethoxysilane, (2) Ethyltriethoxysilane, (3) Dimethyljethoxysilane, (4) Methylethyljethoxysilane
B) Tetraethoxysilane The above-mentioned components (A) and (B) are mixed in the amounts shown in Table 1, and 1 mole of the sum is mixed with 0% distilled water in the presence of hydrochloric acid.
．． 9 mol was added dropwise, the temperature was raised to 81°C, and the mixture was refluxed for 1 hour. Then, while distilling off low-boiling substances, the temperature was raised to 130°C,
Reaction products were obtained by aging under reduced pressure (40On+s+/I1g) for 1 hour (sample numbers 1 to 28). Among these, the samples according to the present invention were 1lhl to 14, and the reference samples for comparison were Na15 to 28. .

Table 1 Next, each sample in Table 1 was diluted 10 times with ethanol, and various performance tests shown in Table 2 were conducted on each of these samples, and the results are shown in Table 2.

The performance test was conducted as follows.

(Grain scratch shielding test) Water at 2°C was poured into a soft drink bottle (200ml1),
After several minutes, each sample was applied to the surface of the bottle, which had condensed, using a sponge.
After leaving it in G41) for 24 hours, the shielding properties of scratches were observed. Furthermore, water at 10° C. was poured into a beer bottle (633 mA), and the test was conducted in the same manner as described above.

A sponge with a width of 1.5 (21) was used, and a strip was applied to the scratched area of the bottle (hereinafter, this applies).

) (stickiness and slipperiness test) Soft drink bottle (200ml) and beer bottle (633
Each sample was applied to the surface of the sample using a sponge, and after being left at room temperature for 3 days, stickiness and slipperiness to the touch were examined.

(Fluff adhesion test) Soft drink bottle (200mj2) and beer bottle (63mj2)
Each sample was applied to a 3 m area using a sponge, left at room temperature for 3 days, and then left outdoors for 14 days to observe the state of dust adhesion.

(Water resistance test) Soft drink bottles (200 mj) and beer bottles (633
Each sample was coated using a sponge and left at room temperature for 5 days, then immersed in water for 7 days, and the state of loss of transparency and peeling of the coating film was observed.

(Flotation test of paint film) The floating state of the coating film was observed according to the above water resistance test.

(Washing bottle removability test) Soft drink bottles (200 mA) and beer bottles (633
Apply each sample to ml using a sponge and incubate for 10 ml at room temperature.
After being left for 0 days, it was immersed in a bottle washing solution (3.5% caustic soda, 0.35% sodium gluconate, 70°C) for 15 minutes, rinsed with warm water, and the removability of the paint film on the bottle was observed.

Table 2 In Table 2, the ◎ mark represents "very good", the 0 mark represents "good", the Δ mark represents "somewhat bad", and the X mark represents "bad".

From Table 2, the coating agent according to the present invention (sample number N11l
14) are all ``very good'' or ``good'' for scratch shielding and other 5 items, and comparative examples (
It can be seen that this is significantly superior to samples 11h15 to 28).

Although monomers were used for components (A) and (B) in the above examples, it was found that the same results as described above could be obtained even if these were polymers.

〔Effect of the invention〕

As described above, the coating agent according to the present invention is not sticky or slippery, does not adhere to any lumps, has good water resistance, and does not have oil floating when immersed in water, and therefore has a high quality content. It does not have a negative effect on the water, and even when it is applied after filling the container with contents at a temperature below room temperature, the film will not be washed away by condensation, so it has good shielding properties and can be used in the bottle washing process. The coating film can be easily removed, making this invention extremely useful in practice.

Claims (1)

[Scope of Claim] A coating agent for scratches on glass containers, which contains as a main component a reaction product produced by the reaction of the following components (A) and (B). (A) 100 parts by weight of a compound of the general formula RSi(OR')n. (B) 5 to 300 parts by weight of a compound of general formula Si(OR')_4. However, in the formulas (A) and (B) above, R is methyl, ethyl, dimethyl or methylethyl group,
R' is an alkyl group of C_1 to C_4, and n is an integer of 2 to 3.