JPH0151520B2 - - Google Patents

Description

[Detailed description of the invention]

This invention deals with drain pipes that are clogged or have poor flow due to solid fat substances, kitchen waste, slime, etc.
Alternatively, the present invention relates to a composition for cleaning oil sumps and the like. Conventionally, cleaning compositions used for the purpose of unblocking drain pipes, etc. that are clogged or have poor flow due to solid fats, kitchen waste, slime, etc., include those containing mainly sulfamic acid as an acidic substance, and alkaline ones. There are commercially available products that mainly contain sodium silicate, caustic soda, and caustic potash as substances, and those that contain sodium hypochlorite as an oxidizing agent.
In particular, those based on caustic alkalis such as caustic soda and caustic potash are widely used. These cleaning agents mainly contain caustic alkalis,
The heat of dissolution when caustic alkalis is dissolved in water melts and saponifies fats and oils such as solid fats, and also dissolves blockages by softening or dissolving kitchen waste, hair, slime, etc. These caustic alkalis There are also drawbacks to those that are based on In other words, among caustic alkalis, caustic soda does not dissolve completely just by adding it to cold water, and can only be completely dissolved by stirring. However, if it does not dissolve completely in this way, the precipitated caustic soda will solidify, resulting in a solid blockage of the drain pipe. Therefore, there is a drawback that caustic soda must be added after the cold water in the blocked drain pipe has been replaced with hot water. An even bigger drawback is that only the part where the caustic soda is dissolved becomes hot due to the heat of dissolution, and depending on the temperature of the hot water and the amount of caustic soda added, there is a risk of bumping. There is a risk of deformation or damage. On the other hand, when caustic potash is used as the caustic alkali, it dissolves rapidly even in cold water, causing a local temperature rise. Table 1 shows that 300ml of water is taken into a 500ml graduated cylinder, and the flaked caustic potash is poured into it.
This figure shows the results of measuring the temperature at the bottom of the graduated cylinder and at the liquid level after 2 seconds, 2 minutes, and 10 minutes.

[Table] As is clear from the above results, depending on the amount of caustic potash added, the temperature can rise to over 100℃, which puts plastic drain pipes at risk. Furthermore, if a large amount is added, there is a risk of bumping even in cold water. In view of the above circumstances, the present invention proposes a composition for cleaning drain pipes, etc., in which caustic alkalis such as caustic soda and caustic potash are dissolved homogeneously at an appropriate rate. The composition of this invention basically consists of solid caustic soda,
It is a mixture of a solid caustic alkali such as caustic potash and an oxygen generating compound such as a hydrogen peroxide adduct which is solid and generates oxygen when it comes into contact with water or is further heated. That is, when caustic soda is used as the solid caustic alkali in the above composition, the hydrogen peroxide adduct added to the water together with the caustic soda decomposes to generate oxygen, but this decomposition is accelerated by the heat of dissolution of the caustic soda. . There, a large number of bubbles are generated and rise, causing intense convection in the aqueous solution.As a result, the surface of the caustic soda is constantly washed with a low concentration aqueous solution, promoting dissolution, and the temperature is also diffused throughout, causing localized areas. does not reach high temperatures. In addition, the dissolution of caustic soda is further accelerated by the heat generated during the decomposition of the hydrogen peroxide adduct, and at the same time,
The heat of dissolution of caustic soda also accelerates the decomposition of oxygen-generating compounds. That is, the chain heat generation promotes the dissolution of the caustic soda and hydrogen peroxide adducts. the result,
Drain pipes, etc. can be cleaned without the risk of bumping or caking of caustic soda. On the other hand, when using caustic potash as a solid caustic alkali, since caustic potash alone dissolves completely without stirring, there is no risk of caking like with caustic soda, but there is a risk of bumping and damage to plastic drain pipes. There is a risk of However, according to the present invention, which uses a combination of caustic potash and an oxygen-generating compound, the oxygen generated from the hydrogen peroxide adduct causes convection, which diffuses heat throughout the aqueous solution, thereby avoiding the risk of bumping. At the same time, it is possible to prevent the temperature of the part where caustic potash is dissolved from becoming high. This avoids damage to the plastic drain pipe. When caustic soda and caustic potash are used together as solid caustic alkalis, there are the following advantages. In other words, if the caustic soda is large or thick, or if the water temperature is low, the dissolution of the caustic soda may be slow or may not completely dissolve even if an oxygen-generating compound is present, but caustic potash may be added. This allows rapid and complete dissolution. The second feature of blending the hydrogen peroxide adduct is that it makes it easier to remove various stains from the wall surface by generating oxygen. In other words, most of the solid and fat substances adhering to the inner wall of the drain pipe, the bottom of the oil sump, and the side walls are made up of fat and will melt as the temperature rises, but there are some solid and fat substances that do not melt. There is a substance. It is presumed that the reason why solid fat substances do not melt is that they are composed not only of fat but also of protein, starch, and various other substances. On the other hand, the composition of the present invention can easily peel off solid fat substances adhering to drain pipes and the like. It is presumed that this is because oxygen generated by the decomposition of the hydrogen peroxide adduct intervenes in the gap between the solid substance and the drain pipe wall surface, promoting peeling. There are various types of solid caustic alkali to be used, such as flakes, tablets, small spheres, and granules, and any of them may be used. However, there is no problem when the entire package is put into water, but when the package is divided and used, classification of each component becomes a big problem. That is, when classified, the characteristics of the composition of the present invention cannot be exhibited, and disadvantages inherent to each component, such as caking in the case of caustic soda and bumping and localized high temperatures in the case of caustic potash, appear. In particular, since most hydrogen peroxide adducts are commercially available in the form of granules, granules, or small particles, incorporating a high percentage of flaky caustic alkali immediately leads to classification. Powdered or granular hydrogen peroxide adduct 60% and, for example, 4 mesh Tyler sieves (hole size 4.699 mm)
Even if you mix up to 40% of commercially available flake caustic alkali with a size of 90% or more, no classification will occur, but if you mix 50% of the same flake caustic alkali and 50% hydrogen peroxide adduct, classification will be noticeable. come. If the flaky caustic alkali is coarsely crushed with a Tyler sieve 4 mesh under 90% or more, the classification will not be noticeable even if the flaky caustic alkali is 50% mixed with the hydrogen peroxide adduct at 50%. Furthermore, if the small flakes of caustic soda are 90% or more under the Tyler sieve 7 mesh (hole size 2.794 mm), the classification will not be noticeable even if the caustic soda is 80% and the hydrogen peroxide adduct is 20%. Tyler sieve 24 mesh (hole size)
0.71mm) If the powder is 90% or more of granular caustic soda, no classification will be observed between it and the hydrogen peroxide adduct at any ratio, and 70% of this mixture contains 4 meshes of flake caustic soda with 90% or more.
Classification is not noticeable even if % is mixed. In short, the smaller the size of the caustic alkali, the higher the blending ratio of the caustic alkali can be while avoiding classification with the hydrogen peroxide adduct. Generally, the lower the blending ratio of the oxygen-generating compound, that is, the higher the blending ratio of the caustic alkali, the greater the calorific value per unit weight, and therefore it is more economical. The compounding ratio of caustic alkali is 20 to 95% by weight,
Preferably it is 50 to 80% by weight. If it is less than 20% by weight, the calorific value is small, so it takes a long time to dissolve caustic soda and the hydrogen peroxide adduct, which is impractical. On the other hand, if it is 95% by weight or more, the blending ratio of the hydrogen peroxide adduct becomes low, so the amount of gas generated is small and the convection of the aqueous solution becomes weak. In particular, caustic soda cannot sufficiently promote dissolution, and caustic potash tends to cause bumping, which is dangerous. Hydrogen peroxide adducts used in the present invention include sodium percarbonate (2Na ₂ CO ₃・3H ₂ O ₂ ), sodium perborate (NaBO ₃ H ₂ O ₂・3H ₂ O), sodium peroxide sulfate, and peroxide. The main ones include hydrogen peroxide adducts of polymerized phosphates such as sodium pyrophosphate, and urea peroxide. Among these, sodium percarbonate and sodium perborate are particularly inexpensive, easy to handle, highly safe, and easy to store. These oxygen-generating compounds are commercially available in the form of powder, small crystals, or granules, and these types of shapes are preferred from the viewpoint of ease of dissolution. The blending ratio of these hydrogen peroxide adducts alone or in combination is 5 to 80
Weight%. If it is less than 5% by weight, the convection of the aqueous solution becomes weak and the dissolution of caustic soda cannot be sufficiently promoted, and undissolved caustic soda may remain and solidify, which may lead to bumping in the case of caustic potash. If the composition exceeds 80% by weight, the calorific value of the composition is low, so that it takes a long time to dissolve the caustic soda and the hydrogen peroxide adduct, making it impractical. Therefore, the preferred blending ratio is 20 to 50% by weight. In addition to the above-mentioned effects, the addition of hydrogen peroxide adducts also has the effect of sterilizing the inside of the drain pipe due to the action of oxygen generated by the decomposition, and at the same time decomposing odor components and having a deodorizing effect. . Further, the above composition may be blended immediately before use, or may be blended in advance. In the latter case, the hydrogen peroxide adduct in the composition will decompose due to moisture absorption during the manufacturing process and in product inventory, resulting in less or no oxygen generation during actual use. . Furthermore, in the case of hydrogen peroxide adducts, the entire composition gradually forms a caking as the decomposition progresses due to the water produced by the decomposition. In order to prevent this phenomenon, it is effective to incorporate a decomposition inhibitor, and the present invention is effective in preventing this phenomenon.
95% by weight, 5-80% by weight of solid hydrogen peroxide adduct, and 0.2% decomposition inhibitor for hydrogen peroxide adduct.
The present invention provides a cleaning agent composition for drain pipes, oil sump, etc., which is formulated from the beginning in an amount of ~10% by weight, can be stably stored even during long-term storage, and is easy to handle. The decomposition inhibitor is composed of one or more magnesium compounds such as silicic anhydride, magnesium oxide, magnesium phosphate, and magnesium silicate. The effect of silicic anhydride is presumed to be that direct contact between caustic alkali and hydrogen peroxide adduct is prevented during product inventory. Therefore, it is preferable that the particle size of the anhydrous silicic acid is smaller because the surface coverage area of the caustic alkali and hydrogen peroxide adduct per unit weight becomes larger. The blending ratio of silicic anhydride is preferably 0.2 to 10% by weight; if it is less than 0.2% by weight, decomposition of the hydrogen peroxide adduct cannot be prevented, and if it is more than 10% by weight, the absolute calorific value decreases, which is not preferred. Regarding the type of silicic anhydride, finely powdered amorphous silicic anhydride, synthetic silicic anhydride having drying power, natural silicic anhydride such as quartz powder, etc. are preferable. Since silica powder contains trace amounts of minerals other than silicic anhydride, such as minerals containing aluminum, its ability to suppress the decomposition of hydrogen peroxide adducts is somewhat lower than that of synthetic silicic anhydride. Incidentally, sodium aluminosilicate, synthetic zeolite, kaolin, acid clay, etc. containing aluminum, calcium, etc. do not have the ability to inhibit decomposition. Note that magnesium compounds have sufficient decomposition suppressing power. The cleaning effect of drain pipes has been explained above, but the composition of the present invention guides the oils and fats mixed with wastewater and flows to a place where the flow is slow, such as a reservoir, and floats them to a so-called oil reservoir where they are stored. It can also be used as a cleaning agent for (grease traps). In other words, when oils and fats leak from the grease trap, the oil and fats adhere to the wall of the drain pipe beyond the grease trap, gradually impairing the drainage and eventually causing a blockage. recovery has become an important issue.
However, grease traps are often located in kitchens, etc., under sinks or deep under the floor, making it extremely difficult to collect the oil. It is. Traditionally, drain cleaners based on caustic alkalis have also been used to clean grease traps.
However, in this case, even if oils and fats are saponified by caustic alkalis, the saponified products are dispersed in water or precipitated, and only so-called partially saponified products containing a large amount of unsaponified oil float to the surface, making complete recovery difficult. be. On the other hand, when the composition of the present invention is put into a grease trap, oils and fats become saponified products, and at the same time, saponified products and filth are dispersed in water accompanied by bubbles generated by decomposition of hydrogen peroxide adducts. , or various dirt peeled off from the bottom or peripheral wall come to the surface. Moreover, since the bubbles adsorb many organic substances, they are extremely stable and difficult to destroy. There, solid saponified substances, unsaponified fats and oils, and other impurities are pushed up by the stable hard foam as described above. Therefore, by scooping out with a wire mesh or the like, saponified substances, unsaponified fats and oils, and other impurities on stable, hard foam can be scooped up as they are, resulting in extremely high work efficiency. It goes without saying that the present invention can be used to clean drain pipes, oil sumps, and other similar objects. Examples of this invention will be shown below. Example 1 300 ml of water was placed in a 500 ml graduated cylinder, 100 g of each experimental formulation shown in Table 2 was added thereto, and the temperatures at the liquid surface and bottom were measured. In addition, the presence or absence of undissolved substances and the state of undissolved substances, if any, were observed 10 minutes after the addition. The results are shown in Table-2.

[Table] As is clear from Table-2 above, Experiments No. 1 to 4
(Comparative Example) When using caustic soda alone, undissolved matter solidifies at temperatures below 30°C regardless of its shape and size.
At 40°C, a small amount of undissolved material remained and no solidification occurred, but as the temperature at the bottom reached 90°C or higher, there was a risk of damage to the plastic drain pipe. In Experiment Nos. 5 to 7, experiments were conducted with a sodium percarbonate blending ratio of 5% and a caustic soda and caustic potash blending ratio of 95%. As a result, a considerable amount of undissolved matter remained at a water temperature of 20°C (Experiment No. 5), but no undissolved matter remained at a water temperature of 40°C (Experiment No. 6), and slight bumping occurred when caustic potash was used ( Experiment No. 7). Therefore, it was recognized that the above blending ratio was in the limit range. On the other hand, when the sodium percarbonate ratio was 80% and the caustic soda ratio was 20%, no temperature increase was observed when the water temperature was as low as 20°C, and the sodium percarbonate remained undissolved (Experiment No. 11). Furthermore, at the above blending ratio and water temperature, no temperature rise was observed even when caustic potash, which is easily soluble, was used, and a considerable amount of soda percarbonate remained, so it was recognized that the upper limit of the sodium percarbonate blending ratio was 80%. In addition, in the preferred blending range of 80% caustic potassium and 20% sodium percarbonate, neither undissolved matter nor bumping was observed (Experiment No. 9). However, when large flakes of 50% caustic soda and 50% sodium percarbonate were mixed, a small amount of undissolved matter remained (Experiment No. 10). It has become clear that the inclusion of larger flakes of caustic soda may be undesirable.
25% small flakes of caustic soda and caustic potash.
When 70% was used in combination, there was no bumping and no undissolved matter remained (Experiment No. 8). From this, it is clear that the combination of caustic soda and caustic potash brings about favorable results. Experiments No. 12 to 16 also show that the combination of caustic soda and caustic potash is preferable, and in particular, experiments No. 15 and No. 16 do not require classification of each component.
It is recognized that the situation is favorable in all aspects. Example 2 The following various substances were added to a base consisting of 70% by weight of granular caustic soda, 10% by weight of flaky caustic potassium, and 20% by weight of granular sodium percarbonate with a Tyler sieve 24 mesh pass of 90% or more, and a thickness of 0.1 mm was added. The material was placed in a polyethylene bag, heat-sealed, one pinhole was made in it, and the material was placed in a constant temperature and humidity chamber at 70% relative humidity and 37°C for 30 days. After 30 days, the cake was taken out, the state of caking was observed, and the amount of available oxygen was measured. The results are shown in Table-3.

[Table] In Table 3 above, experiment numbers 26, 27, 28
is a reference example. As is clear from Table 3 above, magnesium silicate and Aerosil were effective at a blending ratio of about 0.2% by weight, and synthetic silica gel was effective at a blending ratio of 1% by weight. However, no effect was observed with calcium aluminosilicate, sodium aluminosilicate, kaolin, etc. Example 3 1Pour 1000ml of water at 20℃ into a graduated cylinder,
A predetermined amount of the composition of Experiment No. 32 below was added to this, and 5
The temperature was recorded after minutes. The results after 5 minutes were as shown in Table 4. Composition of Experiment No. 32 Tyler sieve 24 mesh Under 90% or more Granular caustic soda 40% by weight Flaked caustic potash 30% by weight Soda percarbonate 29.7% by weight Fine Seal 0.3% by weight

[Table] The result in Table 4 is a straight line expressed by the following relational expression. △t=0.135G...(1) △t; Temperature increase in 1000ml of water (℃) G; Amount of No. 32 added to 1000ml of water (g) In other words, for example, if you want to raise the temperature of 1000ml of water by 14℃, No. 100g of the composition No. 32 should be added. It is extremely safe because the upper limit of the temperature increase can be determined by calculation. Example 4 A hotel drain pipe (made of hard vinyl chloride, inner diameter 25 mm,
Cleaning work was carried out using No. 32 of Example 3 (vertical length 1.2 m). The amount of water was estimated to be 0.6, assuming that the blockage was in the corner of the drain pipe. Hard vinyl chloride pipes are absolutely perfect up to 60°C, and are safe even at 70°C if no pressure is applied, so we set the upper temperature limit to 70°C. Since the water temperature was 24°C, these values were substituted into the above equation (1), and the required amount of No. 32 was determined as follows. (70-24) = 0.135 x G G = 341g For 0.6 of water, 341g x 0.6 = 205g.Next, the drain pipe was filled with water and 200g of No. 32 was immediately added. The temperature 5 minutes after the addition was 68°C, which was almost as expected. Twelve minutes after the water was added, the water flowed out all at once, making a loud sound, and the drain pipe opened. Example 5 In the kitchen of a certain factory in Kawasaki City, leftover vegetables are crushed in a disposer and put together with water into an iron pipe drainage pipe (long
27m (diameter: 100mm) to transport fluid to the dehydration equipment. This drain pipe often gets clogged, and I have to remove the flange and clean it every time. When I inserted my hand into the outlet of the drain pipe and inspected it, I found that oil, fat, leftovers, etc. had adhered to the pipe wall to a thickness of about 2 cm and had solidified. Therefore, the volume of the drain pipe is 60mm.
It was calculated as φ and was set to 76. The temperature of the prepared hot water is 43℃, and the target temperature is 80℃.
Based on the calculation below, the required amount of No. 32 of Example No. 3 was determined to be 22 kg. (80−43) = 0.13G G = 284 (g) 284g x 76 () = 21.6 (Kg) ≒ 22Kg Close the drain pipe outlet and 43
Composition No. 32 was gradually added together with hot water at ℃, and after the inside of the tube was filled, it was left for another 10 minutes. As soon as the outlet was opened, a large amount of leftover food and peeled solid fat was discharged. Example No. 6 No. 1 of Example No. 3 was added to the 100 grease trap.
2 kg of 32 was added and stirred lightly with a stirring rod. Together with the bubbles generated by the decomposition of soda percarbonate,
The decomposing fats and oils that had sunk to the bottom of the grease trap or adhered to the side walls also came to the surface. These bubbles were extremely stable because the organic matter in the grease trap was adsorbed, and the oils and fats were lifted up by these bubbles, forming a stable oil and fat film on the water surface. After leaving it for 30 minutes, I scooped it up with a wire mesh and observed it. Most of the oil film is hard like soap, and underneath it is a layer of hard sponge-like foam about 1 cm thick, which is so hard that it won't break even if you scoop it up with a wire mesh. It was hot. Since the fats and oils in the process of decay contain a large amount of free fatty acids, it is thought that they are easily saponified and turned into soap. Grease trap water contains a lot of organic matter, so the soda percarbonate decomposes rapidly and generates a large amount of foam in a short period of time, which also absorbs the soap that has just been generated and becomes hard foam. Seem. I scooped out the soap and was able to clean the grease trap very efficiently.

Claims (1)

[Claims] 1 Decomposition inhibitor for the hydrogen peroxide adduct consisting of 20-95% by weight of solid caustic alkali, 5-80% by weight of solid hydrogen peroxide adduct, and one or more of silicic anhydride and inorganic magnesium compound 0.2 ~
A composition for cleaning drain pipes, oil sumps, etc., containing 10% by weight.