JPS61157600A - Glass washing pretreatment agent for preventing scuff flaw - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a glass cleaning pre-treatment agent, specifically a cleaning agent capable of preventing the growth of scuff flaws on glass bottles when cleaning the glass bottles. Regarding pretreatment agents.

[Conventional technology and problems]

Glass bottles are widely used for beer, juice, milk, etc., and many are recycled. Glass tends to crack due to physical force, and white scratches called scuff scratches occur on the shoulders and bottoms of bottles, which are often exposed to contact and collision during transportation, filling, etc. However, it devitrifies and impairs its aesthetic appearance, so even though K has sufficient strength to be used, its commercial value decreases and it becomes unfit for recovery and use, significantly lowering the efficiency of recovery and use and causing large losses. is the current situation.

The inventors investigated where scuff flaws occur in the glass bottle collection process and found that the increase in scuff flaws is not only caused by mechanical forces such as collisions, but also by chemical forces during the alkaline cleaning process. It was also found that the extent of scuff flaw growth during the cleaning process was more significant as the number of flaws before cleaning increased.

[Means for solving problems]

Therefore, the inventors of the present invention have conducted extensive studies to solve this problem, and have found that pretreatment with a pretreatment agent containing a specific cationic surfactant before alkaline cleaning has a remarkable effect in preventing scuff defects. This discovery led to the present invention.

That is, 1 the present invention relates to the following general formula (wherein R1, R2, R,, R, are the same or different and represent a saturated or unsaturated hydrocarbon group having 1 to 24 carbon atoms, R1, R2, At least one of R,,R, has 6 or more carbon atoms.J, m, and n represent integers of 1 to 3 and satisfy the formula sn=7Xm.x-7 represents an anion.) The present invention relates to a glass cleaning pretreatment agent for preventing scuff defects, which is characterized by comprising the cationic surfactant shown below.

Although the action of the cleaning pretreatment agent of the present invention is not clear, the present inventors estimate that it is as follows.

B111 The cationic surfactant according to the present invention not only physically adsorbs to the glass surface, but also has the property of chemically bonding with metal ions such as sodium on the glass surface through ion exchange. When the cationic surfactant of the present invention adheres to the glass surface, the glass surface becomes hydrophobic,
It is believed that the increase in scuff flaws can be reduced by the hydrophobic coating protecting points that are particularly active against alkali elution.

In the cationic surfactant represented by the above general formula of the present invention, specific examples of the groups represented by R, R2, R,, R,' are methyl, ethyl, propyl, butyl, octyl,
Straight and branched chain aliphatic hydrocarbon groups such as decyl, lawaryl, palmityl, myristyl, stearyl, oleyl and phenyl.

It is selected from aromatic hydrocarbon groups such as benzyl and naphthyl. Specific examples of the anion represented by x7 are 07-, Br'''', Ni, BO,-, No,-.

Inorganic anions such as p□, -5 or acetic acid, chef's acid.

Citric acid, curconic acid, toluenesulfonic acid.

It is selected from organic anions such as naphthalene sulfonic acid.

Typical examples of the cationic surfactants of the present invention include the following compounds.

[Cl2H2, -N-(C11,),]+oA-[(0
12H2,)2-N-("5)2]"OA-[Ph-0
B2-N-(O)i, ) , )”0#-(Ph-OH2
-N-(OR,),)2''80.- (in the formula, pH represents a phenyl group).
When the concentration of the cationic surfactant represented by the above general formula is 1
The aqueous solution has a concentration of 0 ppm or more, preferably 50 to 11,000 ppm. The glass is immersed in this and then transferred to a cleaning process.

Although the pretreatment agent according to the present invention is effective regardless of the type of glass to be pretreated, the prevention of scuff defects has been sought for a long time, but remains unsolved. Glass bottles such as beer bottles, juice bottles, soy sauce bottles, and milk bottles are especially prized.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited by these Examples.

Example 1 (1) Pretreatment agent used The following compounds were used.

[01□H,,,N(OB,),)”cz-(1)[(
't2H2,)! '(CH3)2:l''07- (I
I) (Ph-CH2-N (O Town),)”07-C
II+) Table IK showing the test results is indicated by these symbols. These compounds were synthesized from laurylamine, silacrylamine, and benzylamine by reacting them with methyl chloride.

(2) Test method A beer bottle was used as a typical glass with noticeable scuff flaws. Beer bottles were selected from recovered bottles so that they had the same degree of damage. After the sample bottle was pretreated, (3) it was washed. Scuff defects are tested using the scuff defect tester shown in Figure 1 before pretreatment, cleaning, rinsing,
Measured after drying. 1, 1 is a glass bottle, 2 is a conveyor, 3 is a light source, 4 is an image sensor camera, 5 is a calculator, 6 is a synchroscope, 7 is a waveform, 8 is a threshold value, and 9 is a light absorption screen.

(Pre-treatment for cleaning) The sample bottle was immersed in pre-treatment solution 1C of a predetermined concentration at 25° C. for 3 minutes, and then thoroughly rinsed with water to perform pre-treatment for alkaline cleaning.

(Washing) 20 minutes after preheating the sample bottle! Four bottles were immersed in the cleaning solution in the tank and washed at 80°C for 1 hour with stirring. The cleaning liquid is an aqueous solution containing 4% caustic soda and 0.4% sodium gluconate. After washing, take out the sample bottle and wash the bottle surface with water while lowering the bottle temperature. After drying the bottle surface.

The area of the scuff flaw was measured.

Results The test results are shown in Table IK. The increase in flaws in the table is the increase rate of scuff flaws and is a value expressed by the following formula.

Table 1 Scuff flaw suppression test From Table 1, when no pretreatment was applied (control)
Compared to K, it can be seen that when pre-treatment was performed using the treatment solution of the present invention, the rate of increase in flaws was significantly reduced, that is, the ability to suppress scuff flaws was remarkable. The concentration of pretreatment chemicals is 500 and 11
At 000 pp, the higher the effect, the higher the effect, but the difference is not that big.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a scuff flaw evaluation test machine. 1...Glass bottle 2...Conhair s-@- light source 4...Image senna camera 5...φ calculator 6...φ synchroscope 7...Waveform 8...Darkness value 9...Light absorption Screen applicant's agent Furu
Kaoru Tani Figure 1

Claims (1)

[Claims] 1. The following general formula ▲ Numerical formula, chemical formula, table, etc. ▼ Represents a hydrocarbon group, and at least one of R_1, R_2, R_3, and R_4 has 6 or more carbon atoms.l, m, and n are 1
It represents an integer of ~3 and satisfies the formula n=l×m. x^
-^l represents an anion. ) A glass cleaning pre-treatment agent for preventing scuff defects, characterized by comprising a cationic surfactant represented by: