Bentonite cat litter deodorizing and dust-reducing agent as well as preparation method and application thereof

Abstract

The invention provides a bentonite cat litter deodorizing and dust-reducing agent as well as a preparation method and application thereof. The bentonite cat litter deodorizing and dust-reducing agent comprises an oleic acid emulsion and / or a linoleic acid emulsion, the oleic acid emulsion comprises a mixed emulsifier, an oil phase and water, and the mixed emulsifier comprises polyoxyethylene sorbitan monolaurate and potassium oleate; the oil phase comprises oleic acid and undecanol; the linoleic acid emulsion comprises a mixed emulsifier and an oil phase, and the mixed emulsifier comprises polyoxyethylene sorbitan monooleate and potassium oleate; the oil phase comprises linoleic acid and undecanol. The bentonite cat litter deodorizing and dust-reducing agent has the advantages of fast water absorption, large water absorption and the like of the bentonite cat litter, and successfully overcomes the defects of poor deodorizing capability and large dust of the bentonite cat litter, so that the performance of the bentonite cat litter product is more perfect, and the bentonite cat litter deodorizing and dust-reducing agent has an extremely good application prospect.

Description

Technical Field

[0001] The invention belongs to the field of bentonite production and processing, and particularly relates to a deodorizing and dust-reducing agent for bentonite cat litter, a preparation method and application thereof. Background Art

[0002] Bentonite cat litter is the most commonly used cat litter at present. It has strong hygroscopicity, good clumping ability, and the lowest price. It can quickly absorb the water and urine in the feces and condense into lumps, which is easy to clean. However, it has always had two defects: poor ability to eliminate pet odor and dust pollution.

[0003] If the pet odor is only urine odor, it is relatively simple to deal with. The main source of urine odor is ammonia, and bentonite cat litter has a good effect in absorbing and fixing ammonia. However, if there are other odors such as trimethylamine, methylamine, ethylamine, indole, hydrogen sulfide, methyl sulfide and other odor components produced by pet feces, body odor, secretion odor, etc., the bentonite cat litter has a poor absorption and fixing effect. In order to improve the deodorizing effect of bentonite cat litter, people have used many methods such as adding silica gel, activated carbon, molecular sieves and other substances with strong odor absorption ability, but the addition of these substances improves the deodorizing effect while greatly reducing the water absorption performance and greatly increasing the cost.

[0004] Bentonite cat litter particles are weak and fragile, which will form a large amount of dust, polluting indoor air and human health. The simplest way to solve the problem of cat litter dust is to produce strip or spherical cat litter with larger particles, but large-particle cat litter is prone to cause pet urine to not be completely absorbed and flow to the bottom of the cat litter basin due to the large gaps between particles. Eliminating bentonite cat litter dust can also be solved by adding a binder. Patent CN111937757A provides a small-particle bentonite cat litter, using water glass as a binder to avoid dust generation. Patent CN112400709A crushes sodium bentonite and modified zeolite together for premixing and then adds water glass for bonding and granulation. The water glass added here also plays a bonding and dust-proof role. However, this dust removal method with an external binder often greatly loses the water absorption performance of bentonite, making the performance of cat litter worse.

[0005] Therefore, improving the deodorizing ability of bentonite cat litter and preventing and reducing dust are issues that need to be addressed urgently. Summary of the invention

[0006] The present application provides a method for solving the deodorization and dust problems of bentonite cat litter, namely, a bentonite cat litter deodorizing and dust reducing agent, a preparation method and application thereof.

[0007] The bentonite cat litter deodorizing and dust reducing agent provided in the present application comprises oleic acid emulsion and / or linoleic acid emulsion;

[0008] The oleic acid emulsion comprises a mixed emulsifier, an oil phase and water, wherein the mixed emulsifier comprises polyoxyethylene sorbitan monolaurate and potassium oleate; the oil phase comprises oleic acid and undecanol;

[0009] The linoleic acid emulsion comprises a mixed emulsifier, an oil phase and water, wherein the mixed emulsifier comprises polyoxyethylene sorbitan monooleate and potassium oleate; and the oil phase comprises linoleic acid and undecanol.

[0010] The bentonite cat litter deodorizing and dust reducing agent comprises a mixture of oleic acid emulsion and linoleic acid emulsion, that is, a mixture of two emulsions with oleic acid emulsion as the main emulsion and linoleic acid emulsion as the auxiliary emulsion, wherein the mass ratio of the main emulsion to the auxiliary emulsion is ≥15.

[0011] Undecanol is a lemon flavoring agent, which gives the cat litter a lemon flavor.

[0012] The mass ratio of the oleic acid or linoleic acid to undecanol is 99:1.

[0013] The mass ratio of polyoxyethylene sorbitan monolaurate to potassium oleate in the oleic acid emulsion is 92:8.

[0014] The mass ratio of polyoxyethylene sorbitan monooleate to potassium oleate in the linoleic acid emulsion is 78:22.

[0015] The mass ratio of the oil phase and the mixed emulsifier in the oleic acid emulsion or the linoleic acid emulsion is 20-40%.

[0016] The mass ratio of the oil phase to the mixed emulsifier in the oleic acid emulsion or the linoleic acid emulsion is preferably 9:1 to 10.3:1.

[0017] The invention also provides a method for preparing a bentonite cat litter deodorizing and dust reducing agent, comprising the steps of uniformly mixing polyoxyethylene sorbitan monolaurate and potassium oleate, adding oleic acid and undecanol, stirring uniformly, and then adding hot water, stirring uniformly, to obtain a stable oleic acid emulsion; or uniformly mixing polyoxyethylene sorbitan monooleate and potassium oleate, adding linoleic acid and undecanol, stirring uniformly, and then adding hot water, stirring uniformly, to obtain a stable linoleic acid emulsion.

[0018] Also included is mixing an oleic acid emulsion with a linoleic acid emulsion.

[0019] The invention also provides a modified bentonite cat litter, comprising the bentonite cat litter deodorizing and dust reducing agent, wherein the mass percentage of the bentonite cat litter deodorizing and dust reducing agent is 2.5% to 5%.

[0020] The present invention also provides a method for using the bentonite cat litter deodorizing and dust reducing agent, comprising diluting the bentonite cat litter deodorizing and dust reducing agent with water and spraying the diluted bentonite cat litter evenly on the surface of the sieved bentonite cat litter particles to obtain a modified bentonite cat litter with the deodorizing and dust reducing agent covered on the surface.

[0021] The mass percentage of the bentonite cat litter deodorizing and dust reducing agent after being diluted with water is generally 2%.

[0022] The deodorizing mechanism of the bentonite cat litter deodorizing and dust reducing agent of the present application: pet odor includes pet urine odor, feces odor, secretion odor and body odor, etc. The main odor substances are trimethylamine, methylamine, ethylamine, indole, methyl indole, hydrogen sulfide, methyl sulfide, isovaleric acid, nonyl aldehyde, etc. They can be divided into alkaline odor substances such as trimethylamine, methylamine, ethylamine, etc., acidic odor substances such as indole, methyl indole, hydrogen sulfide, methyl sulfide, isovaleric acid, etc., and neutral odor substances such as nonyl aldehyde, etc. The main components of the bentonite cat litter deodorizing and dust reducing agent of the present application are two high-boiling point organic acids, oleic acid and linoleic acid, which can form hydrogen bonds with acidic odorous substances such as indole, methyl indole, hydrogen sulfide, methyl sulfide, and isovaleric acid to fix them, and can also react with alkaline substances such as trimethylamine, methylamine, and ethylamine to form organic acid amine salts to fix them. At the same time, oleic acid and linoleic acid are both high-boiling point organic solvents. They have strong dissolving and absorbing capabilities for low-molecular polar odorous substances such as organic amines and organic sulfur. Even if the above reaction does not occur in time, the volatilization and diffusion of these odorous substances can be slowed down by the dissolved van der Waals force to reduce the odor of pet excrement.

[0023] The amphiphilic structure of the polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monooleate and potassium oleate used in the present application has a strong adsorption and fixation ability for odorous substances with strong polarity such as methylamine, ethylamine, trimethylamine, butyric acid, 2-nonyl enal, indole, 3-methylindole, etc., and has a prominent effect on eliminating the odor of pet feces. When they work together with oleic acid and linoleic acid oil phase substances, the deodorization rates of methylamine, trimethylamine and indole reach 78% and 82% respectively.

[0024] The dust prevention and dust reduction mechanism of the bentonite cat litter deodorizing and dust reduction agent of the present application: oleic acid emulsion and linoleic acid emulsion have extremely low vapor pressure and volatility under normal temperature conditions, covering and infiltrating the surface of bentonite cat litter particles, reducing the brittleness of the bentonite particles, and greatly increasing the surface toughness of the bentonite particles, thereby reducing the wear of the bentonite cat litter particles during transportation and use, reducing the generation of dust, and achieving the purpose of dust prevention and dust reduction. In addition, these bentonite cat litter deodorizing and dust reduction agents of the present application all have strong moisture absorption and moisture retention functions, which is also beneficial to the dust prevention and dust reduction of bentonite cat litter.

[0025] The bentonite cat litter deodorizing and dust reducing agent of the present invention successfully overcomes the disadvantages of poor deodorizing ability and large dust of bentonite cat litter while retaining the advantages of bentonite cat litter such as fast water absorption and large water absorption amount, thereby improving the performance of bentonite cat litter products.

[0026] The technical innovations of the present invention are as follows:

[0027] 1. The present application adopts oleic acid and / or linoleic acid as the main agent of bentonite cat litter deodorizing and dust reducing agent, and utilizes their ability to form hydrogen bonds with acidic odorous substances, neutralize with alkaline odorous substances, and dissolve them to fix and retain these odorous substances in the cat litter, thereby greatly improving the deodorizing performance of bentonite cat litter.

[0028] The amphiphilic structure of the polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monooleate and potassium oleate used in the present application has a strong adsorption and fixation ability for odorous substances with strong polarity such as methylamine, ethylamine, trimethylamine, butyric acid, 2-nonyl aldehyde, indole, 3-methyl indole, etc., and has a prominent effect on eliminating the odor of pet feces. When they work together with oleic acid and linoleic acid oil phase substances, the deodorization rates of methylamine, trimethylamine and indole can reach 78% and 82%.

[0029] 2. The bentonite cat litter deodorizing and dust-reducing agent of the present application utilizes the characteristics of high viscosity, low vapor pressure and low volatility of oleic acid, linoleic acid, polyoxyethylene sorbitan monolaurate and polyoxyethylene sorbitan monooleate to cover and infiltrate the surface of bentonite cat litter particles, thereby greatly improving the surface toughness of bentonite cat litter particles, thereby reducing the fragility and wear of bentonite cat litter particles during transportation and use, reducing the generation of dust, and achieving the purpose of dust prevention and dust reduction. In addition, the strong moisture absorption and moisture retention functions of oleic acid and linoleic acid in the bentonite cat litter deodorizing and dust-reducing agent are also beneficial to the dust prevention and dust reduction of bentonite cat litter. Effectively solve the defect of large amount of dust in bentonite cat litter.

[0030] 3. The use of the bentonite cat litter deodorizing and dust reducing agent of the present application does not substantially change the original production process of the bentonite cat litter, but only adds a spraying device to the original process, and does not require a large amount of equipment investment.

[0031] 4. Bentonite cat litter deodorizing and dust reducing agent is easy to use and has low material consumption. It can solve the problems of poor deodorizing effect and high dust of bentonite cat litter with low cost and simple operation.

[0032] 5. The use of the bentonite cat litter deodorizing and dust reducing agent of the present application can also make the cat litter emit a slight lemon fragrance, which can reduce people's discomfort with the odor released by pets. DETAILED DESCRIPTION

[0033] Example 1

[0034] 1. Bentonite cat litter deodorizing and dust reducing agent - oleic acid emulsion

[0035] (1) 9.2 g of polyoxyethylene sorbitan monolaurate and 0.8 g of potassium oleate were respectively mixed, and then 85 g of oleic acid and 5 g of undecanol were added and stirred evenly. Then 200 g of hot water was added and stirred evenly to obtain an oleic acid emulsion dust suppressant.

[0036] (2) 9.2 g of polyoxyethylene sorbitan monolaurate and 0.8 g of potassium oleate were respectively mixed, and then 95 g of oleic acid and 5 g of undecanol were added and stirred evenly. Then, 200 g of hot water was added and stirred evenly to obtain an oleic acid emulsion.

[0037] (3) 9.2 g of polyoxyethylene sorbitan monolaurate and 0.8 g of potassium oleate were respectively mixed, and then 98 g of oleic acid and 5 g of undecanol were added and stirred evenly. Then, 200 g of hot water was added and stirred evenly to obtain an oleic acid emulsion.

[0038] The oleic acid emulsions obtained by (1), (2) and (3) were respectively diluted into 2% aqueous solutions, and 250 g of each was uniformly sprayed on 10 kg of bentonite cat litter (derived from the comparative example) particles with a moisture content of ≤10% to obtain bentonite cat litter samples A-1, A-2 and A-3.

[0039] 2. Bentonite cat litter deodorizing and dust reducing agent - linoleic acid emulsion

[0040] (1) Take 7.8 g of polyoxyethylene sorbitan monooleate and 2.2 g of potassium oleate respectively and mix them evenly, then add 85 g of oleic acid and 5 g of undecanol and stir evenly, then add 200 g of hot water and stir evenly to obtain a linoleic acid emulsion.

[0041] (2) Take 7.8 g of polyoxyethylene sorbitan monolaurate and 2.2 g of potassium oleate respectively, mix them evenly, then add 95 g of oleic acid and 5 g of undecanol, stir evenly, then add 200 g of hot water, stir evenly, and obtain a linoleic acid emulsion.

[0042] (3) Take 7.8 g of polyoxyethylene sorbitan monolaurate and 2.2 g of potassium oleate respectively, mix them evenly, then add 98 g of oleic acid and 5 g of undecanol, stir evenly, then add 200 g of hot water, stir evenly, and obtain a linoleic acid emulsion.

[0043] The three linoleic acid emulsions were diluted to 2% aqueous solution, and 250 g of each was taken and sprayed evenly on 10 kg of bentonite cat litter (from comparative example) particles with a moisture content of ≤10% to obtain bentonite cat litter samples B-1, B-2 and B-3.

[0044] Comparative Example

[0045] (1) Add industrial soda ash at a mass ratio of 2% to natural calcium-based bentonite for three times of extrusion sodiumization, cover and seal with a plastic film for 3 days, dry at 115° C. until the moisture content is ≤10%, sieve, collect 1-3 mm particles, and obtain a bentonite cat litter comparison sample.

[0046] Embodiment and comparative example cat litter detection method are as follows:

[0047] 1. Water absorption rate: According to GB / T20973-2007 "New water absorption rate test method provided by porous plate method", the specific test steps are as follows: put the porous ceramic plate into a glass container and immerse it in distilled water to make the porous ceramic plate soaked. During the test, the upper surface of the porous ceramic plate is always kept 6±1mm above the water surface, and the temperature of the glass container and water is kept stable at 20±2℃.

[0048] Two pieces of filter paper were immersed in distilled water for 30 seconds to make them saturated with water, and then placed on a porous ceramic plate to balance the moisture for 60 minutes, and then the filter paper was weighed separately.

[0049] Weigh two portions of 5±0.01 g of cat litter samples that have been dried to a constant weight at 105±3°C, and sprinkle them evenly on two wet filter papers. The diameter of the cat litter spread is about 9 cm.

[0050] Place the filter paper and cat litter symmetrically on the porous ceramic plate (be careful not to overlap), cover with the glass container lid. After standing for 2 hours, carefully remove the wet filter paper and cat litter samples with tweezers and a spatula, and weigh them on a balance.

[0051] The water absorption rate of cat litter is calculated according to formula (1):

[0052]

[0053] Where: Wa—water absorption rate, %; W—mass of wet filter paper and wet cat litter, g; W0—mass of wet filter paper, g; m—mass of dry cat litter sample, g.

[0054] 2h water absorption rate (%) ≥ 200 is qualified.

[0055] 2. Dust test

[0056] Fill a 500mL beaker with cat litter, and sprinkle it at a constant speed from a height of 0.5m, diagonally facing the sunlight. Observe the dust of the cat litter. If there is no visible smoke or dust, the dust is qualified.

[0057] 3. Fragrance effect test

[0058] Weigh 2000g of cat litter and put it into the cat litter box. Use a quantitative syringe to draw 20mL of 1% sodium chloride solution and inject it into the cat litter at a speed of 1.5mL / s. After 30 minutes, 5 people conduct odor scoring tests respectively. The scoring test and result judgment are shown in Table 1.

[0059] Table 1 Odor scoring test and result judgment

[0060]

[0061] 4. Deodorization effect measurement

[0062] Prepare 1000 mL of a mixed solution of 0.01% methylamine, trimethylamine, indole and 1% sodium chloride and set aside.

[0063] Weigh 2000g of each of A-1, A-2, A-3, B-1, B-2 and B-3 respectively and put them into a cat litter box, draw 20mL of the above solution with a quantitative syringe, inject it into the cat litter at a speed of 1.5mL / s, immediately put it into a sample chamber reformed by a constant temperature drying oven and balance it for 1h at 26°C, then access a solid adsorbent (Tenax GC) sampling tube at the sampling port drawn from the thermometer socket, and a sampling pump extracts 10L of air at a flow rate of 0.2L / min to collect methylamine, trimethylamine and indole in the air, and the sampling tube is heated and desorbed after sampling, and the measured methylamine, trimethylamine and indole enter 35°C capillary chromatographic columns with nitrogen for separation, and are detected with a hydrogen flame ionization detector, and the peak height is quantitative. Weigh 2000g of a comparison sample at the same time and do the same test, and the measurement results are shown in Table 1.

[0064] The test results of the embodiments and comparative examples are shown in Table 2.

[0065] Table 2 Comparative experimental results

[0066] sample A-1 A-2 A-3 B-1 B-2 B-3 Comparison sample dust none none none none none none big Water absorption / % 332 327 332 326 331 327 328 fragrance Fragrance Fragrance Fragrance Fragrance Fragrance Fragrance none VOC / g.m3 0.76 0.73 0.74 0.63 0.62 0.58 3.43

[0067] As can be seen from Table 1, the use of the bentonite cat litter deodorizing and dust reducing agent of the present application has basically no effect on the water absorption index of the bentonite cat litter, but has excellent dust prevention and dust reduction effects, especially the deodorizing effect is outstanding, and the odor reduction range is 78.3% and 82.2% respectively. Among them, the deodorizing effect of linoleic acid emulsion is slightly better than that of oleic acid emulsion, successfully overcoming the two defects of poor deodorizing ability and large dust of bentonite cat litter. The cat litter also has a certain lemon fragrance, which will make the bentonite cat litter product more attractive.

Claims

1. A bentonite cat litter deodorizing and dust reducing agent, characterized in that: including oleic acid emulsion and / or linoleic acid emulsion; The oleic acid emulsion comprises a mixed emulsifier, an oil phase and water, wherein the mixed emulsifier comprises polyoxyethylene sorbitan monolaurate and potassium oleate; the oil phase comprises oleic acid and undecanol; The linoleic acid emulsion comprises a mixed emulsifier, an oil phase and water, wherein the mixed emulsifier comprises polyoxyethylene sorbitan monooleate and potassium oleate; and the oil phase comprises linoleic acid and undecanol.

2. A bentonite cat litter deodorizing and dust-reducing agent as claimed in claim 1, characterized in that: It includes a mixture of two emulsions with oleic acid emulsion as the main emulsion and linoleic acid emulsion as the auxiliary emulsion, or linoleic acid emulsion as the main emulsion and oleic acid emulsion as the auxiliary emulsion, wherein the mass ratio of the main emulsion to the auxiliary emulsion is ≥15.

3. A bentonite cat litter deodorizing and dust-reducing agent as claimed in claim 1, characterized in that: The mass ratio of the oleic acid or linoleic acid to undecanol is 99:

1.

4. A bentonite cat litter deodorizing and dust reducing agent as claimed in claim 1, characterized in that: The mass ratio of polyoxyethylene sorbitan monolaurate to potassium oleate in the oleic acid emulsion is 92:

8.

5. A bentonite cat litter deodorizing and dust reducing agent as claimed in claim 1, characterized in that: The mass ratio of polyoxyethylene sorbitan monooleate to potassium oleate in the linoleic acid emulsion is 78:

22.

6. A bentonite cat litter deodorizing and dust-reducing agent as claimed in claim 1, characterized in that: The mass ratio of the oil phase to the mixed emulsifier in the oleic acid emulsion or the linoleic acid emulsion is 9:1 to 10.3:

1.

7. A method for preparing the bentonite cat litter deodorizing and dust reducing agent according to claim 1, characterized in that: The method comprises mixing polyoxyethylene sorbitan monolaurate and potassium oleate evenly, adding oleic acid and undecanol, stirring evenly, and then adding hot water, stirring evenly to obtain a stable oleic acid emulsion; or mixing polyoxyethylene sorbitan monooleate and potassium oleate evenly, adding linoleic acid and undecanol, stirring evenly, and then adding hot water, stirring evenly to obtain a stable linoleic acid emulsion.

8. The method for preparing a bentonite cat litter deodorizing and dust-reducing agent as claimed in claim 7, wherein: Also included is mixing an oleic acid emulsion with a linoleic acid emulsion.

9. A modified bentonite cat litter, characterized in that: The deodorizing and dust-reducing agent for bentonite cat litter comprises the bentonite cat litter deodorizing and dust-reducing agent as claimed in claim 1, and the usage amount is 2.5% to 5% of the mass of the bentonite cat litter.

10. A method for using the bentonite cat litter deodorizing and dust reducing agent according to claim 1, characterized in that: The method comprises the steps of diluting a bentonite cat litter deodorizing and dust reducing agent with water and spraying the diluted bentonite cat litter evenly on the surface of sieved bentonite cat litter particles to obtain a modified bentonite cat litter with the deodorizing and dust reducing agent covering the surface.

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