A deodorizing cat litter material containing modified straw fiber and cassava starch composite structure

Abstract

The application discloses a deodorizing cat litter material containing modified straw fiber and cassava starch composite structure and belongs to the technical field of pet products. The cat litter material comprises a composite base material and a functional additive, the composite base material takes modified straw fiber and cassava starch as core components, forms a'skeleton-bonding' composite structure, the modified straw fiber constitutes a supporting skeleton, the cassava starch fills the gaps between the skeleton and forms a dense clumping layer as a bonding agent; the functional additive comprises a deodorizing agent and a bonding aid, and after being mixed and formed with the composite base material, physical adsorption and chemical decomposition are realized to achieve synergistic deodorization. The application utilizes modified agricultural straw waste for recycling, reduces cost and is environment-friendly, the cassava starch improves the clumping performance of the cat litter, the modified straw fiber enhances the adsorption and deodorization capacity, and the problems of poor deodorization effect, loose clumping and insufficient environmental protection of traditional cat litter are solved. The cat litter material is efficient in deodorization, compact in clumping, low in dust and degradable, and has a wide application prospect.

Description

Technical Field

[0001] This invention belongs to the field of pet product technology, specifically relating to an odor-removing cat litter material containing a composite structure of modified straw fiber and cassava starch. Background Technology

[0002] With the continuous increase in pet ownership, cat litter, as an essential item for cats' daily lives, is experiencing sustained growth in market demand. Currently, cat litter on the market is mainly divided into bentonite cat litter and tofu cat litter. Bentonite cat litter, while having good clumping properties, suffers from problems such as high dust levels, non-biodegradability, and easy clogging of drains. Long-term use may also cause respiratory sensitivities in cats. Tofu cat litter, made from plant fibers, is environmentally friendly and biodegradable, but generally has drawbacks such as limited odor removal, easy rancidity and foul odor under high temperature and humidity conditions, and loose clumping.

[0003] Agricultural straw is a large amount of waste generated in agricultural production. Improper handling can cause environmental pollution. Rich in fiber and possessing a porous structure, it can exhibit excellent adsorption properties after modification, making it suitable as a base material for cat litter. Cassava starch is widely available and inexpensive. It gelatinizes quickly upon contact with water and generates strong binding force, making it a suitable binder for cat litter, improving clumping performance. However, simply mixing straw fiber with cassava starch to prepare cat litter results in problems such as weak fiber-starch bonding, insufficient odor removal durability, and inadequate clumping strength, making it difficult to meet practical application needs.

[0004] While there are existing reports on the preparation of cat litter using plant fibers and starch, most methods lack targeted modification of the straw fibers or the formation of a reasonable composite structure, making it difficult to simultaneously achieve the core properties of cat litter such as adsorption, odor removal, and clumping. Furthermore, in the current cat litter preparation process, material ratios and molding parameters rely heavily on experience for control, lacking scientific algorithmic support, resulting in poor product performance stability and significant batch-to-batch variations. Therefore, developing a cat litter material that utilizes modified straw fibers and cassava starch to form a composite structure, offering excellent odor removal, stable performance, and environmental friendliness, has significant practical importance and market value. Summary of the Invention

[0005] To address the problems of poor odor removal, loose clumping, insufficient environmental friendliness, and poor performance stability in existing cat litter technologies, this invention provides an odor-removing cat litter material containing a composite structure of modified straw fiber and cassava starch. This cat litter material utilizes the porous adsorption properties of modified straw fiber and the binding and clumping properties of cassava starch to form a synergistic effect. At the same time, functional additives enhance the odor removal effect, and a dedicated algorithm controls the preparation process to ensure stable product performance and realize the resource utilization of agricultural waste, making it more environmentally friendly and economical.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A deodorizing cat litter material containing a modified straw fiber and cassava starch composite structure includes a composite substrate and functional additives. The composite substrate has modified straw fiber and cassava starch as core components. The functional additives are mixed and molded with the composite substrate. The composite structure is a "skeleton-bond" composite structure. The modified straw fiber forms a supporting skeleton, and the cassava starch acts as a binder to fill the gaps in the skeleton and form a dense agglomerated layer. The cat litter material has deodorizing properties through a synergistic combination of physical adsorption and chemical decomposition.

[0008] Furthermore, by mass percentage, the composite substrate accounts for 70% to 95% of the total mass of the cat litter material, and the functional additives account for 5% to 30% of the total mass of the cat litter material; wherein, the mass ratio of modified straw fiber to cassava starch in the composite substrate is 1:0.3 to 1:1.2. This ratio range ensures the stability of the composite structure, balancing adsorption and odor removal performance with clumping performance. If the proportion of modified straw fiber is too high, the clumping property of the cat litter will decrease; if the proportion of cassava starch is too high, it will lead to poor air permeability of the cat litter, making it easy for bacteria to grow.

[0009] Furthermore, the modified straw fiber is crop straw fiber that has undergone hydrophilic modification and pore structure modification, wherein the crop straw is selected from at least one of corn straw, wheat straw, and rice straw; the hydrophilic modification is performed using a silane coupling agent, and the pore structure modification is performed using steam explosion modification. Steam explosion modification can disrupt the dense structure of the straw fiber, increasing its specific surface area and porosity, and improving its adsorption performance; hydrophilic modification can enhance the compatibility between the straw fiber and cassava starch, preventing their separation, and simultaneously improving the water absorption performance of the cat litter.

[0010] Furthermore, the silane coupling agent is selected from at least one of KH-550 and KH-560, and the amount of silane coupling agent used during modification is 0.5% to 3% of the straw fiber mass; the steam explosion modification pressure is 0.8 to 2.0 MPa, and the holding time is 30 to 300 seconds. This parameter range ensures the modification effect. If the amount of silane coupling agent is too small, the modification effect will be insignificant; if the amount is too large, it will increase the cost and may affect the safety of the cat litter. If the steam explosion pressure and holding time are too high or too long, it will cause the straw fiber to break and reduce the skeleton support performance; if they are too low or too short, a porous structure cannot be effectively formed.

[0011] Furthermore, the functional additives include an odor remover and a binding agent. The odor remover is selected from at least one of nano-zinc oxide, activated carbon, and bio-enzymes. The binding agent is selected from at least one of guar gum, xanthan gum, and sodium carboxymethyl cellulose. In the odor remover, nano-zinc oxide has antibacterial and odor-removing effects; activated carbon can physically adsorb odor molecules; and bio-enzymes can chemically decompose urea and skatole in urine. The synergistic effect of these three components enhances the durability of the odor removal effect. The binding agent further strengthens the adhesion of the composite substrate, improving the clumping strength and dispersion stability of the cat litter.

[0012] Furthermore, by mass percentage, the deodorizing agent accounts for 40% to 70% of the total mass of the functional additives, and the binding agent accounts for 30% to 60% of the total mass of the functional additives; the bio-enzyme is a compound enzyme preparation of Bacillus subtilis and lipase, with a mass ratio of 1:0.5 to 1:1.5. This ratio ensures a balance between deodorizing and binding effects, and the combination of the compound bio-enzyme can specifically decompose odor components in urine, improving deodorizing efficiency.

[0013] Furthermore, the cat litter material has a particle size of 1-5mm, a bulk density of 300-700g / L, a water absorption rate of ≥200%, an ammonia removal rate of ≥92%, a hydrogen sulfide removal rate of ≥93%, and a clumping strength of ≥3.5N. These performance parameters meet the needs of cats; the moderate particle size prevents accidental ingestion; the light bulk density facilitates use and transportation; the water absorption and odor removal rates ensure effective use; and the clumping strength prevents the litter from crumbling during cleaning.

[0014] This invention also discloses a method for preparing the above-mentioned odor-removing cat litter material, comprising the following steps:

[0015] (1) Preparation of modified straw fiber: After crushing and drying the straw, it is subjected to steam explosion modification and hydrophilic modification in sequence, and then dried to obtain modified straw fiber;

[0016] (2) Mixing and mixing: Mix the modified straw fiber, cassava starch and non-heat-sensitive functional additives evenly, add deionized water to adjust the moisture content of the material to 8%~12%, seal and let stand until the moisture is evenly distributed;

[0017] (3) Molding and drying: The mixture is granulated and dried, then cooled to room temperature;

[0018] (4) Post-coating: Prepare the biological enzyme preparation into an aqueous solution and spray it evenly onto the surface of the cooled cat litter granules. Air dry at a low temperature of no more than 40 degrees Celsius for 10 to 30 minutes until the moisture content meets the standard.

[0019] (5) Screening: Screening retains particles of 1-5 mm to obtain odor-removing cat litter material.

[0020] Furthermore, in step (1), the particle size of the crushed straw is controlled at 0.1~1mm, the drying temperature is 60~80℃, and the moisture content is dried to ≤5%; in step (3), the drying temperature is 80~120℃, and the drying time is 20~60min. These parameters ensure that the raw materials are fully dried, avoid problems such as clumping and loosening during subsequent molding, and ensure the uniformity of cat litter particles.

[0021] Furthermore, in step (2), the mixing process uses a high-speed mixer with a mixing speed of 1000~2000 r / min and a mixing time of 5~15 min; the granulation is carried out by extrusion granulation or centrifugal encapsulation granulation, and the material ratio and molding parameters are controlled by a special algorithm during the granulation process to ensure the stability of the composite structure.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This invention uses modified straw fiber and cassava starch to form a "skeleton-bond" composite structure. The modified straw fiber serves as a supporting skeleton with a rich porous structure, which can efficiently adsorb odor molecules and achieve physical deodorization. The cassava starch serves as a binder, filling the gaps in the skeleton and forming a dense clumping layer, which improves the clumping performance of cat litter and solves the problem that traditional cat litter cannot simultaneously achieve deodorization and clumping.

[0024] 2. This invention modifies straw fiber through steam explosion and hydrophilicity modification, which increases the specific surface area and porosity of straw fiber, improves its adsorption and deodorization capacity, enhances its compatibility with cassava starch, avoids the separation of the composite structure, realizes the resource utilization of agricultural waste, reduces the cost of cat litter, and is more environmentally friendly.

[0025] 3. The functional additives of this invention combine deodorizing agents and binding agents. The deodorizing agent achieves synergistic deodorization through physical adsorption and chemical decomposition, improving the durability of the deodorizing effect. The binding agent further enhances the adhesion of the composite substrate, ensuring that the cat litter clumps are firm and not easily disintegrated. At the same time, the added biological enzymes and other ingredients can inhibit bacterial growth and improve the safety of use.

[0026] 4. In the preparation method of the present invention, the material ratio and molding parameters are controlled by a special algorithm, which solves the problem that parameters rely on experience for control and the product performance is unstable in the existing preparation process, ensuring the performance consistency of different batches of cat litter and improving product quality.

[0027] 5. The cat litter material of this invention has a moderate particle size, low dust, and is biodegradable. It can be flushed directly after use without clogging the sewer. It also has an ammonia removal rate of ≥92%, a hydrogen sulfide removal rate of ≥93%, and a clumping strength of ≥3.5N. It has excellent overall performance and is suitable for widespread use. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] Example 1

[0030] A cat litter material containing a modified corn stalk fiber and cassava starch composite structure comprises, by weight percentage, 85% composite base material and 15% functional additives. In the composite base material, the mass ratio of modified corn stalk fiber to cassava starch is 1:0.8. Of the functional additives, 60% is an odor-eliminating agent and 40% is a binding agent. The odor-eliminating agent is obtained by mixing nano-zinc oxide and activated carbon at a mass ratio of 1:1. Guar gum is used as the binding agent.

[0031] The preparation method of this cat litter material includes the following steps:

[0032] (1) Preparation of modified corn stalk fiber: Corn stalks were crushed to a particle size of 0.5 mm and dried at 70°C to a moisture content of 4%. The dried stalk fiber was placed in a steam explosion device and held at 1.2 MPa for 120 s to complete the pore structure modification. Then, 1.5% of KH-560 silane coupling agent by weight of the stalk fiber was added, stirred evenly, and dried at 75°C to a moisture content of ≤5% to obtain modified corn stalk fiber.

[0033] (2) Mixing and batching: According to the above proportions, add the modified corn stalk fiber, cassava starch, nano zinc oxide, activated carbon and guar gum into a high-speed mixer and mix at 1500 r / min for 10 min. Add deionized water to adjust the moisture content of the material to 10%, seal and let stand for 2 h to make the moisture distribution uniform.

[0034] (3) Molding and drying: The mixture is granulated using an extrusion granulator. During the granulation process, the material ratio and molding parameters are controlled by a special algorithm. The granulated particles are placed in a drying equipment and dried at 100°C for 40 minutes, and then cooled to room temperature.

[0035] (4) Post-coating: Prepare the biological enzyme preparation into an aqueous solution, spray it evenly on the surface of the cat litter granules, and air dry at 40°C for 15 minutes.

[0036] (5) Screening: Screening retains particles of 2~4mm to obtain odor-removing cat litter material.

[0037] Example 2

[0038] A cat litter material containing a modified straw fiber and cassava starch composite structure comprises, by weight percentage, 75% composite base material and 25% functional additives. In the composite base material, the mass ratio of modified wheat straw fiber to cassava starch is 1:0.5. Of the functional additives, 50% is an odor-eliminating agent and 50% is a binding agent. The odor-eliminating agent is obtained by mixing a bio-enzyme and activated carbon at a mass ratio of 1:2. The bio-enzyme is obtained by mixing Bacillus subtilis and lipase at a mass ratio of 1:1. The binding agent is obtained by mixing xanthan gum and sodium carboxymethyl cellulose at a mass ratio of 1:1.

[0039] The preparation method of this cat litter material includes the following steps:

[0040] (1) Preparation of modified wheat straw fiber: Wheat straw was crushed to a particle size of 0.3 mm and dried at 65°C to a moisture content of 3%. The dried straw fiber was placed in a steam explosion device and held at 0.9 MPa for 90 s to complete the pore structure modification. Then, 1.0% of KH-550 silane coupling agent by weight of straw fiber was added, stirred evenly, and dried at 70°C to a moisture content of ≤5% to obtain modified wheat straw fiber.

[0041] (2) Mixing and mixing: According to the above proportions, add modified wheat straw fiber, cassava starch, activated carbon, xanthan gum and sodium carboxymethyl cellulose to a high-speed mixer and mix at 1200 r / min for 8 min. Add deionized water to adjust the moisture content of the material to 9%, seal and let stand for 1.5 h to make the moisture distribution uniform.

[0042] (3) Molding and drying: The mixture is granulated using a centrifugal granulator. During the granulation process, the material ratio and molding parameters are controlled by a special algorithm. The granulated particles are placed in a drying equipment and dried at 90°C for 50 minutes, and then cooled to room temperature.

[0043] (4) Post-coating: Prepare the biological enzyme preparation into an aqueous solution, spray it evenly on the surface of the cat litter granules, and air dry at 40°C for 15 minutes.

[0044] (5) Screening: Screening retains particles of 1~3mm to obtain odor-removing cat litter material.

[0045] Example 3

[0046] A cat litter material containing a modified straw fiber and cassava starch composite structure comprises, by weight percentage, 90% composite base material and 10% functional additives. In the composite base material, the mass ratio of modified rice straw fiber to cassava starch is 1:1.0. Of the functional additives, 65% is an odor-eliminating agent and 35% is a binding agent. The odor-eliminating agent is obtained by mixing nano-zinc oxide, bio-enzymes, and activated carbon in a mass ratio of 1:1:1. The bio-enzyme is obtained by mixing Bacillus subtilis and lipase in a mass ratio of 1:1.2. The binding agent is sodium carboxymethyl cellulose.

[0047] The preparation method of this cat litter material includes the following steps:

[0048] (1) Preparation of modified rice straw fiber: Rice straw was crushed to a particle size of 0.8 mm and dried at 75°C to a moisture content of 5%. The dried straw fiber was placed in a steam explosion device and held at 1.8 MPa for 180 s to complete the pore structure modification. Then, 2.0% of KH-560 silane coupling agent by weight of straw fiber was added, stirred evenly, and dried at 80°C to a moisture content of ≤5% to obtain modified rice straw fiber.

[0049] (2) Mixing and mixing: According to the above proportions, add modified rice straw fiber, cassava starch, nano zinc oxide, activated carbon and sodium carboxymethyl cellulose to a high-speed mixer and mix at 1800 r / min for 12 min. Add deionized water to adjust the moisture content of the material to 11%, seal and let stand for 2.5 h to make the moisture distribution uniform.

[0050] (3) Molding and drying: The mixture is granulated using an extrusion granulator. During the granulation process, the material ratio and molding parameters are controlled by a special algorithm. The granulated particles are placed in a drying equipment and dried at 110°C for 30 minutes, and then cooled to room temperature.

[0051] (4) Post-coating: Prepare the biological enzyme preparation into an aqueous solution, spray it evenly on the surface of the cat litter granules, and air dry at 40°C for 15 minutes.

[0052] (5) Screening: Screening retains particles of 3~5mm to obtain odor-removing cat litter material.

[0053] Example 4

[0054] A deodorizing cat litter material containing a modified straw fiber and cassava starch composite structure comprises, by weight percentage, 90% composite base material and 10% functional additives. In the composite base material, the mass ratio of modified corn straw fiber to cassava starch is 1:0.3. Of the functional additives, deodorizing agent accounts for 60%, and binding agent accounts for 40%. The deodorizing agent is obtained by mixing nano-zinc oxide and activated carbon at a mass ratio of 1:1. The binding agent is guar gum.

[0055] The preparation method of this cat litter material includes the following steps:

[0056] (1) Preparation of modified corn stalk fiber: Corn stalks were crushed to a particle size of 0.5 mm and dried at 70°C to a moisture content of 4%. The dried stalk fiber was placed in a steam explosion device and held at 1.2 MPa for 120 s to complete the pore structure modification. Then, 1.5% of KH-560 silane coupling agent by weight of the stalk fiber was added, stirred evenly, and dried at 75°C to a moisture content of ≤5% to obtain modified corn stalk fiber.

[0057] (2) Mixing and batching: According to the above proportions, add the modified corn stalk fiber, cassava starch, nano zinc oxide, activated carbon and guar gum into a high-speed mixer and mix at 1500 r / min for 10 min. Add deionized water to adjust the moisture content of the material to 10%, seal and let stand for 2 h to make the moisture distribution uniform.

[0058] (3) Molding and drying: The mixture is granulated using an extrusion granulator. During the granulation process, the material ratio and molding parameters are controlled by a special algorithm. The granulated particles are placed in a drying equipment and dried at 100°C for 40 minutes, and then cooled to room temperature.

[0059] (4) Post-coating: Prepare the biological enzyme preparation into an aqueous solution, spray it evenly on the surface of the cat litter granules, and air dry at 40°C for 15 minutes.

[0060] (5) Screening: Screening retains particles of 2~4mm to obtain odor-removing cat litter material.

[0061] Example 5

[0062] A cat litter material containing a modified corn stalk fiber and cassava starch composite structure comprises, by weight percentage, 80% composite base material and 20% functional additives. In the composite base material, the mass ratio of modified corn stalk fiber to cassava starch is 1:1.2. Of the functional additives, 60% is an odor-eliminating agent and 40% is a binding agent. The odor-eliminating agent is obtained by mixing nano-zinc oxide and activated carbon at a mass ratio of 1:1. The binding agent is guar gum.

[0063] The preparation method of this cat litter material includes the following steps:

[0064] (1) Preparation of modified corn stalk fiber: Corn stalks were crushed to a particle size of 0.5 mm and dried at 70°C to a moisture content of 4%. The dried stalk fiber was placed in a steam explosion device and held at 1.2 MPa for 120 s to complete the pore structure modification. Then, 1.5% of KH-560 silane coupling agent by weight of the stalk fiber was added, stirred evenly, and dried at 75°C to a moisture content of ≤5% to obtain modified corn stalk fiber.

[0065] (2) Mixing and batching: According to the above proportions, add the modified corn stalk fiber, cassava starch, nano zinc oxide, activated carbon and guar gum into a high-speed mixer and mix at 1500 r / min for 10 min. Add deionized water to adjust the moisture content of the material to 10%, seal and let stand for 2 h to make the moisture distribution uniform.

[0066] (3) Molding and drying: The mixture is granulated using an extrusion granulator. During the granulation process, the material ratio and molding parameters are controlled by a special algorithm. The granulated particles are placed in a drying equipment and dried at 100°C for 40 minutes, and then cooled to room temperature.

[0067] (4) Post-coating: Prepare the biological enzyme preparation into an aqueous solution, spray it evenly on the surface of the cat litter granules, and air dry at 40°C for 15 minutes.

[0068] (5) Screening: Screening retains particles of 2~4mm to obtain odor-removing cat litter material.

[0069] In the cat litter granulation process, this invention employs a specialized algorithm to control the material ratio and molding parameters, ensuring the stability of the composite structure and the consistency of product performance. The algorithm is as follows:

[0070] 1. Core formula of the algorithm

[0071] (1) Material proportioning control formula:

[0072] (2) Molding pressure control formula:

[0073] (3) Granulation speed control formula:

[0074] 2. The meaning of each letter in the algorithm is public.

[0075] In the above formula, the specific meanings of each letter are as follows: all letters are algorithm-specific parameters used to precisely control the cat litter preparation process. The moisture content influence coefficient and the composite structure correction coefficient are empirical constants obtained through multiple linear regression analysis based on data collected from previous low-temperature granulation processes of plant-derived materials under different moisture and pressure conditions. Those skilled in the art can reproduce and calibrate this series of coefficients through conventional orthogonal experiments.

[0076] : Actual amount of the i-th raw material used (unit: kg) n represents the total number of raw material types (in this invention, n≥4, which are modified straw fiber, cassava starch, deodorizing agent, and binding agent, respectively).

[0077] : The correction factor for the i-th raw material, with a value ranging from 0.95 to 1.05, is adjusted according to the purity and activity of the raw material (when the purity is ≥98%). =1.0; for every 1% decrease in purity, (Decrease by 0.01)

[0078] -W_total: Total mass of cat litter prepared in a single batch (unit: kg), which can be set according to production needs (the value in this embodiment of the invention is 100 kg).

[0079] : The theoretical mass percentage of the i-th raw material (unit: %), that is, the mass percentage of each raw material recorded in the claims;

[0080] Actual granulation pressure (unit: MPa) is used to control the compactness of cat litter granules and ensure the stability of the composite structure.

[0081] The reference granulation pressure (unit: MPa) ranges from 1.5 to 3.0 MPa and should be adjusted according to the granulation method (for extrusion granulation). =2.0MPa; during centrifugal encapsulation granulation =1.5MPa);

[0082] -β: Moisture content influence coefficient, with a value of 0.08~0.12, used to correct the influence of material moisture content on granulation pressure;

[0083] -W_water: Mass of deionized water in the material (unit: kg);

[0084] -W_dry_material: The total mass of all dry raw materials in the material (unit: kg), i.e., W_dry_material = W_total - W_water;

[0085] -γ: Composite structure correction coefficient, with a value range of 0.9~1.1, adjusted according to the mass ratio of modified straw fiber to cassava starch (γ=1.05 when the mass ratio is 1:0.3~1:0.7; γ=0.95 when the mass ratio is 1:0.8~1:1.2).

[0086] -N: Actual granulation speed (unit: r / min), used to control the particle size uniformity of cat litter granules;

[0087] The reference granulation speed (unit: r / min) ranges from 100 to 300 r / min and should be adjusted according to the model of the granulation equipment.

[0088] -ρmixture: The actual bulk density of the mixture (unit: g / cm³), obtained in real time by online detection equipment;

[0089] -ρ standard: Standard bulk density of the mixture (unit: g / cm³), with a range of 0.6~0.8 g / cm³, set according to the raw material ratio;

[0090] -δ: Wear coefficient, with a value of 0.001~0.003, used to correct the effect of wear on rotational speed of granulation equipment;

[0091] -t: Continuous running time of the granulation equipment (unit: h), used to adjust the speed in real time and compensate for errors caused by equipment wear.

[0092] 3. Algorithm Application Description

[0093] This algorithm collects parameters such as the bulk density, moisture content, and equipment running time of the mixture in real time, and substitutes them into the above formula to calculate the actual amount of each raw material, granulation pressure, and granulation speed, thereby achieving precise control of the preparation process. For example, when the actual bulk density of the mixture is higher than the standard bulk density, the granulation speed is reduced by formula (3) to avoid excessively large cat litter particles; when the moisture content of the material increases, the granulation pressure is appropriately increased by formula (2) to ensure the compactness of the agglomerates. This algorithm can effectively solve the problems of relying on experience to control parameters and unstable product performance in the existing preparation process, and ensure that the particle size, agglomeration strength, deodorization performance, and other indicators of different batches of cat litter remain consistent.

[0094] 4. Bulk density test: The volumetric flask method is used to weigh a certain volume of cat litter and calculate its bulk density.

[0095] The test results are shown in the table below:

[0096]

[0097] The test results show that the odor-removing cat litter material prepared by this invention has a water absorption rate of ≥210%, an ammonia removal rate of ≥93.5%, a hydrogen sulfide removal rate of ≥94.5%, a clumping strength of ≥3.8N, and a bulk density of 420~510g / L. It has excellent comprehensive performance and meets the needs of cats.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A deodorizing cat litter material containing a modified straw fiber and cassava starch composite structure, characterized in that, The product includes a composite substrate and functional additives. The composite substrate has modified straw fiber and cassava starch as core components. The functional additives are mixed with the composite substrate and molded. The composite structure is a "skeleton-bond" composite structure. The modified straw fiber forms a supporting skeleton, and the cassava starch acts as a binder to fill the gaps in the skeleton and form a dense agglomerated layer. The cat litter material has odor removal properties through a synergistic combination of physical adsorption and chemical decomposition.

2. The odor-removing cat litter material according to claim 1, characterized in that, By mass percentage, the composite substrate accounts for 70% to 95% of the total mass of the cat litter material, and the functional additives account for 5% to 30% of the total mass of the cat litter material; wherein, the mass ratio of modified straw fiber to cassava starch in the composite substrate is 1:0.3 to 1:1.

2.

3. The odor-removing cat litter material according to claim 1, characterized in that, The modified straw fiber is crop straw fiber that has undergone hydrophilic modification and pore structure modification. The crop straw is selected from at least one of corn straw, wheat straw, and rice straw. The hydrophilic modification is performed using a silane coupling agent, and the pore structure modification is performed using steam explosion modification.

4. The odor-removing cat litter material according to claim 3, characterized in that, The silane coupling agent is selected from at least one of KH-550 and KH-560, and the amount of silane coupling agent used during modification is 0.5% to 3% of the mass of straw fiber; the steam explosion modification pressure is 0.8 to 2.0 MPa, and the pressure holding time is 30 to 300 s.

5. The odor-removing cat litter material according to claim 1, characterized in that, The functional additives include deodorizing agents and binding agents. The deodorizing agent is selected from at least one of nano zinc oxide, activated carbon, and biological enzymes, and the binding agent is selected from at least one of guar gum, xanthan gum, and sodium carboxymethyl cellulose.

6. The odor-removing cat litter material according to claim 5, characterized in that, By mass percentage, the deodorizing agent accounts for 40% to 70% of the total mass of the functional additives, and the binding agent accounts for 30% to 60% of the total mass of the functional additives; the bio-enzyme is a compound enzyme preparation of Bacillus subtilis and lipase, with a mass ratio of 1:0.5 to 1:1.

5.

7. The odor-removing cat litter material according to claim 1, characterized in that, The cat litter material has a particle size of 1~5mm, a bulk density of 300~700g / L, a water absorption rate of ≥200%, an ammonia removal rate of ≥92%, a hydrogen sulfide removal rate of ≥93%, and a clumping strength of ≥3.5N.

8. A method for preparing the odor-removing cat litter material as described in any one of claims 1 to 7, characterized in that, Includes the following steps: (1) Preparation of modified straw fiber: After crushing and drying the straw, it is subjected to steam explosion modification and hydrophilic modification in sequence, and then dried to obtain modified straw fiber; (2) Mixing and mixing: Mix the modified straw fiber, cassava starch and non-heat-sensitive functional additives evenly, add deionized water to adjust the moisture content of the material to 8%~12%, seal and let stand until the moisture is evenly distributed; (3) Molding and drying: The mixture is granulated and dried, then cooled to room temperature; (4) Post-coating: Prepare the biological enzyme preparation into an aqueous solution and spray it evenly onto the surface of the cooled cat litter granules. Air dry at a low temperature of no more than 40 degrees Celsius for 10 to 30 minutes until the moisture content meets the standard. (5) Screening: Screening retains particles of 1-5 mm to obtain odor-removing cat litter material.

9. The preparation method according to claim 8, characterized in that, In step (1), the particle size of the crushed straw is controlled at 0.1~1mm, the drying temperature is 60~80℃, and the moisture content is ≤5%; in step (3), the drying temperature is 80~120℃, and the drying time is 20~60min.

10. The preparation method according to claim 8, characterized in that, In step (2), a high-speed mixer is used for the mixing process, with a mixing speed of 1000~2000 r / min and a mixing time of 5~15 min; the granulation is carried out by extrusion granulation or centrifugal encapsulation granulation, and the material ratio and molding parameters are controlled by a special algorithm during the granulation process to ensure the stability of the composite structure.

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