JPS61157595A - Detergent composition for glass - 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] [Industrial Field of Application] The present invention relates to a cleaning liquid composition for glass, and more specifically, the present invention relates to a cleaning liquid composition for glass, and more specifically, it can be used to remove scuff scratches (pear scratches) on the surface of glass bottles when cleaning the glass bottles.
The present invention relates to a cleaning liquid composition capable of preventing the growth of.

[Conventional technology and problems]

Glass is widely used for beer, juices, milk, etc., and much of it is recycled. Glass tends to crack due to physical force, and white scuff-like 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 it is strong enough to be used, its commercial value decreases and it becomes unsuitable for recovery and use, which significantly lowers the efficiency of recovery and use, resulting in large losses. The current situation is that

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 degree of growth of scuff flaws during the cleaning process was more significant as the number of flaws before cleaning increased.

[Means for solving problems]

As a result of intensive studies aimed at solving this problem, the inventors of the present invention succeeded in developing a cleaning liquid composition that meets the intended purpose and have arrived at the present invention.

That is, 1 the present invention comprises 0.5% by weight or more of one or more alkali bases selected from caustic soda, caustic potash, sodium silicate, and potassium silicate, and a calcium ion-releasing substance or calcium complex of 0.0% in terms of calcium ion.
This invention relates to a glass cleaning liquid composition characterized by containing 0.05% by weight or more.

Although the remarkable effects of the present invention are not necessarily clear, they are thought to be due to the following mechanism. Glass contains various metals (Na, K) in the network structure of polymerized silicate.
, Oa, etc.) are scattered to form a stabilized structure. In new glass manufactured by melting, the terminals of silicate polymers are only probabilistically present on the glass surface, but on the newly formed surface due to scratches or the cross section of the scratch, molecular chains of polymerized silicate are cut and silicate polymers are formed. It is thought that many terminals are generated. It is believed that the keratin-like silicate ends are susceptible to dissolution by alkaline cleaning solutions, ie, they are active. When glass is cleaned with an alkaline cleaning solution, the surface of the glass is eluted in a thin layer, resulting in high cleaning performance. Scuff flaws on glass bottles increase significantly under alkaline cleaning conditions, and the extent of the scuff flaws on glass bottles increases significantly.

Based on these facts, the present inventors thought that it would be possible to reduce the rate of increase in scuff flaws by effectively sealing off points that dissolve quickly in alkali, that is, active points, by some means.

Generally, silicates form soluble salts with alkali metals, but insoluble salts with divalent or higher polyvalent metals. After studying these metal ions, the present inventors discovered that only calcium ions have a unique and remarkable effect on preventing scuff defects, and arrived at the present invention.

It is interesting that among the metal ions, aluminum, iron, and magnesium ions have almost no effect, and only calcium ions have an effect on preventing scuff defects. It is assumed that this is related to the surface structure of the so-called active points on the surface of the cracks in the scuff flaws and their ionic radius (including hydration water in the alkaline solution), but the details are unknown.

The drugs used in the present invention are not particularly limited, but the following compounds are preferably used.

1. Alkaline base caustic soda or sodium silicate. Caustic potash or potash silicate can also be used in special cases. The concentration of the alkaline base in the cleaning liquid composition is 0.5% by weight or more, preferably 1 to 10% by weight.

2. Calcium ion-releasing substances or calcium complex calcium ions used as agents for preventing scuff defects tend to become calcium hydroxide and precipitate in alkaline solutions, so their solubility is low. Therefore, in order to have a certain concentration as a practical cleaning liquid, it is necessary to use it as a complex, so choose from calcium salts of oxycarboxylic acids, polycarboxylic acids, aminocarboxylic acids, diphosphonic acids, and aminophosphonic acids. One or more compounds are preferably used. Specifically, oxalic acid, maleic acid, citric acid, butyric acid,
y luconic acid, malic acid, conolilic acid, ethylenediaminetetraacetic acid, di) T) lff triacetic acid, aminotri(methylenephosphonic acid), 1-hydroxyethylidene-1,1
- Calcium salts such as diphosphonic acid.

The concentration of the calcium ion-releasing substance or calcium complex in the cleaning liquid composition should be 0.005% by weight or more in terms of calcium ions, preferably 0.01 to 1% by weight.
Weight%.

Moreover, after previously dissolving the corresponding carboxylic acids, etc. or their metal salts other than calcium in an alkaline solution,
It is also possible to prepare the cleaning liquid composition of the present invention by adding a calcium ion source such as calcium chloride.

In addition, the cleaning liquid composition of the present invention may contain various commonly known surfactants, generally known organic chelating agents, generally known organic and inorganic dispersants, preservatives, bactericidal agents, etc. for the purpose of improving cleaning properties. There is no harm in adding it.

The object of cleaning with this cleaning liquid composition is glass, and it is effective for cleaning any kind of glass, but the prevention of scuff defects has long been desired and remained unsolved for beer bottles. Glass bottles such as 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 to these examples.

Example 1 (1) Chemicals used Caustic soda and sodium orthosilicate were used as the alkaline base. Sodium gluconate was used as a detergency enhancer.

Calcium citrate, calcium oxalate, and calcium gluconate were used as calcium sources. All reagents were reagent grade.

(2) Glass washability test A beer bottle was used as a typical example of glass with noticeable scuff flaws. Beer bottles were selected from among the collected bottles so that the degree of flaw was the same as before the cleaning test.

The cleaning test was conducted after preheating the beer bottle for 20 minutes! Four bottles were immersed in the cleaning solution in the tank at 80° C. for 1 hour with stirring. 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 flaws was measured using a scuff flaw evaluation tester shown in FIG. 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,
9 is a light absorbing screen.

(5) Results Table 1 shows the results of the cleaning test when the cleaning solution contained 4.0% by weight of caustic soda. The concentration of added drug is □, 1% by weight.

Table 1 Cleaning test (flaw area ratio) Table 1 The numbers in parentheses indicate the increase rate of scuff flaws. The calculation formula is as follows.

From Table 1, it can be seen that the effect of lucicum salt is remarkable when sodium gluconate is not added, and the increase rate of scuff defects is reduced by 35 to 46% compared to the control (A8~&
10) Sodium aluminate and iron gluconate (1st and 2nd) seem to be expected to have an inhibitory effect, but they are found to significantly increase the effect. Regarding magnesium salts, it is found that magnesium oxalate has almost no effect, and magnesium citrate and magnesium gluconate increase scuff defects.

Sodium gluconate is often added for the purpose of improving detergency, and it is clear that even when 0.4% sodium gluconate is added, the effect is equal to or better than when it is not added. It can be seen that the effects of the calcium salts of gluconic acid and schulaic acid are significant, and can reduce scuff defects to about one-fifth of the control.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a scuff flaw evaluation test machine. i ll-glass bottle 211. Conveyor 31, light source 4, ψ, image sensor camera 5, e-calculator 6... synchroscope 7... waveform 8... threshold 9... light absorbing screen agent Kaoru Furuya Figure 1

Claims (1)

[Scope of Claims] 1. 0.5% by weight or more of one or more alkaline bases selected from caustic soda, caustic potash, sodium silicate, and potassium silicate, and 0.5% by weight or more of a calcium ion-releasing substance or calcium complex in terms of calcium ions. 005% by weight
A glass cleaning liquid composition characterized by containing the above. 2. Claim 1, wherein the calcium ion-releasing substance or calcium complex is one or more compounds selected from calcium salts of oxycarboxylic acids, polycarboxylic acids, aminocarboxylic acids, diphosphonic acids, and aminophosphonic acids. The glass cleaning liquid composition described in 1. 3. The glass cleaning liquid composition according to claim 1 or 2, wherein the glass is a glass bottle.