JPS6026057B2 - How to shield glass containers from scratches - Google Patents

Description

[Detailed Description of the Invention] Glass containers such as beer bottles that are collected and used repeatedly are mainly rubbed against each other during the bottle tying process, distribution process, etc., causing scratches on the surface of the container (usually beer bottles, etc. have band-like scratches). (appears to be whitened) occurs.

As a result, the appearance of glass containers deteriorates as the number of times they are collected and used increases, and the commercial value of pin-tied beverages decreases. In order to prevent such a decrease in commercial value, it may be possible to coat the glass container with a shielding agent to form a film. In addition to having good scratch-shielding properties, such coatings are also required to have water resistance, since bottled products are often immersed in cold water in the summer. On the other hand, so-called coated bottles are known as containers such as bottles with a permanent water-resistant coating, but with repeated use, the permanent coating itself gets scratched and cannot be used for its intended purpose. cannot be achieved. Therefore, there has been a desire for a good method of shielding the containers from scratches each time they are collected and reused. As a means for solving the above-mentioned needs, a method disclosed in Hakama-Seki No. 55-56040 was proposed before the present invention.

However, since this method uses a cured product of organopolysiloxane containing phenyl groups as a film-forming material,
When forming a film, the organopolysiloxane must be used as an ethanol solution, which is extremely dangerous in terms of the working environment and limits its versatility. Moreover, when cleaning and sterilizing the collection pins with alkaline, the membrane must be completely washed away, but since the membrane is poorly soluble, careful attention must be paid to controlling its thickness. The present invention aims to provide a method for shielding glass containers from scratches that does not cause such problems. The film to be coated on the glass container must, of course, have good scratch-shielding properties, but many other conditions are also required.

In other words, the necessary and sufficient conditions for food containers include safety, shielding properties, good appearance, no off-flavors, and no harm to the quality of beer. It is required that it is not sticky or slippery, that the film does not peel off or float when immersed in water, that there is little dust adhesion, and that it maintains a good appearance even after repeated soaking and drying. Furthermore, production issues include good workability, which means that the vehicle component must be easily diluted with a stable aqueous emulsion before film formation, and that good paintability requires proper age and, for example, nozzle openings in spray painting. It is required to be able to be completely washed out each time in a bottle washing machine without losing detergency, to have a stable supply, and preferably to be inexpensive. Among the above-mentioned problems, the method of Mochiseki Sho 55-56 et al. 0 has solved the problems of food containers, etc. and the problems during the distribution process to a large extent, but it has not been able to solve the problem of manufacturing problems. do not have. The present invention completely solves this last problem. The inventors have tested the effectiveness of a number of film-forming materials in shielding glass containers from scratches and have found that emulsified dispersions of dimethylpolysiloxane, ie, dimethylsilicone, are suitable for the purposes of the present invention.

The present inventors also discovered that oily aminomethylpolysiloxane (hereinafter referred to as aminosilicone), in which some of the methyl groups of dimethylsilicone were substituted with amino groups, also had film-forming properties similar to dimethylsilicone, and that aminosilicone alone Aminosilicone cannot be used for the purpose of the present invention because the membrane is alkali-resistant, and since this aminosilicone forms a mixed emulsion with dimethylsilicone in any proportion, it can be used up to 5% by weight of dimethylsilicone. It was discovered that when used in combination with the addition of dimethylsilicone, it is possible to strengthen the dimethyl silicone film without impairing bottle washability. This is thought to be due to the crosslinking reaction of amines/groups in the silicone. If the combined use of amino silicone is less than 5%, it will not be very effective, and if it exceeds 50%, the alkali solubility will suddenly deteriorate. A preferred amount is about 5 to 20%. The dimethyl silicone used in the present invention is an oil with a viscosity of several hundred to several thousand centistokes and falls into the category of silicone oil, and forms a stable emulsified dispersion in the presence of an emulsifier, and this emulsified dispersion is free. can be diluted to
It is also commercially available and easy to obtain. Note that dimethyl silicone can be emulsified with various activators, but in the case of the present invention, for the purpose of use, emulsifiers known as food emulsifiers,
For example, fatty acid esters of sorbitan, monoesters of glycerin, etc. are preferred, and bran fatty acid esters are also effective for emulsification stability. However, it is of course not limited to this. When these emulsified dispersions or their dilutions are applied to a glass surface and dried, they form a uniform water-impregnable oily thin film.

An emulsified dispersion containing dimethyl silicone and amino silicone as the main dispersion components adheres well to glass, but has no affinity with other substances, so this film does not adhere to foreign substances and has a concentration of about 2 to 4%. 5 with caustic soda solution and 50-80q0
After about 20 minutes of contact (this is normal washing bottle conditions), the film completely peels off from the glass surface and is washed away. The film itself and its film formability completely satisfy the requirements of the present invention, especially the most important abrasion shielding effect. The film thickness required to achieve the present invention is 0.5 m to 1 h, preferably 1 m to 3 h.

Application may be by spraying or dipping. The emulsion may be diluted to a viscosity that is convenient for coating and allows the formation of a film of a predetermined thickness. Since no catalyst is used in this emulsified dispersion, the physical properties of the dispersion do not change even if it is left to stand, which is also a feature of the present invention. Example A dimethyl silicone emulsion dispersion consisting of 31.5% silicone oil, 4% dispersant, 1% stabilizer, and the balance water was TSM6341 manufactured by Toshiba Silicone.As an amino silicone emulsion dispersion, Toshiba Silicone XS70 was used. 10
No. 27 was used as a sample, and a manufacturing and distribution test was conducted by applying it to the body of Beer Daimoku.

The sample was diluted with twice the amount of water so that the amount applied per bottle of Beer Daikei was 0.3 ml.The manufacturing and distribution tests were conducted by repeatedly passing the sample through the line of the Beer Sumikyu factory. The results obtained are shown in the following table, proving that the combined effect of dimethyl silicone and amino silicone, ie, amino-methyl polysiloxane, is extremely useful. Criteria for evaluation of scratch shielding agent application test results for Beer Weir ◎: Very good ○: Appetizing △: Poor ×: Poor

Claims (1)

[Claims] 1 Dimethylpolysiloxane and amino-methylpolysiloxane in which some of the methyl groups of dimethylpolysiloxane are substituted with amino groups are the main dispersion components, and amino-methylpolysiloxane has a ratio of 5 to
A method for shielding scratches on glass containers, which comprises forming a film by coating an emulsified dispersion containing 50% by weight.