Laundry soap and process for its preparation

Abstract

The application belongs to the technical field of laundry soap, and relates to a laundry soap and a preparation process thereof, which comprises the following raw materials in parts by weight: 900-1100 parts by weight of soap particles, 0-100 parts by weight of zeolite, 0-1 part by weight of chelating agent, 1-2 parts by weight of water purifying agent, 0-0.1 part by weight of antioxidant, 5-6 parts by weight of essence, 0.05-0.15 parts by weight of pigment and 7-9 parts by weight of water; the zeolite is selected from 4A zeolite or modified 4A zeolite. The laundry soap can improve the anti-hard water degree while guaranteeing the appearance and use performance of the product.

Description

Technical Field

[0001] This application relates to the field of laundry soap technology, and in particular to a laundry soap and its preparation process. Background Technology

[0002] Laundry soap is a traditional laundry detergent, mainly composed of sodium fatty acid salts, which has advantages such as strong cleaning power and low price. Currently, the dry sodium soap content of mainstream domestic laundry soaps (semi-transparent type) is about 70%. Manufacturers generally hope to appropriately reduce the fatty acid content by adding washing aids, thereby reducing production costs. However, if the fatty acid content is reduced too much, the soap is prone to cracking and insufficient hardness.

[0003] 4A zeolite is an aluminosilicate ion-exchange molecular sieve that can allow Na+ in its framework to pass through. + With Ca in water 2 + Mg 2+ Ion exchange softens hard water and improves its resistance to hard water. Due to its phosphorus-free and environmentally friendly properties, 4A zeolite has been widely used as a phosphorus substitute in phosphate-free laundry detergents and is gradually being incorporated into the formulations of laundry soaps, transparent soaps, and other soap products. However, 4A zeolite is a water-insoluble solid powder with poor dispersibility in the soap matrix. When added in large quantities, it tends to agglomerate, leading to decreased soap transparency, increased sensory hardness, and even affecting foaming performance. Furthermore, the ion exchange sites of ordinary 4A zeolite are mainly distributed within the zeolite framework, with limited surface active sites, leaving room for improvement in its total adsorption capacity for calcium and magnesium ions in hard water.

[0004] Therefore, improving hard water resistance while ensuring product appearance and performance remains a technical problem that needs to be solved in this field. Summary of the Invention

[0005] This invention provides a laundry soap and its preparation process, which can improve hard water resistance while ensuring product appearance and performance.

[0006] In a first aspect of this application, a laundry soap is provided, comprising the following raw materials in parts by weight: 900-1100 parts by weight of soap granules, 0-100 parts by weight of zeolite, 0-1 parts by weight of chelating agent, 1-2 parts by weight of water purifier, 0-0.1 parts by weight of antioxidant, 5-6 parts by weight of fragrance, 0.05-0.15 parts by weight of pigment, and 7-9 parts by weight of water; wherein the zeolite is selected from 4A zeolite or modified 4A zeolite.

[0007] By adopting the above technical solution, this application provides a laundry soap that can improve hard water resistance while ensuring product appearance and performance. This may be because the rare earth ions in the modified 4A zeolite are loaded on the surface of the 4A zeolite, thus preserving the Na+ of the zeolite framework. + On the one hand, ion exchange sites are formed on the zeolite surface, and on the other hand, rare earth ion exchange sites are formed, which additionally adsorb Ca from hard water through electrostatic attraction and ion exchange. 2+ Mg 2+ This improved the total calcium and magnesium adsorption capacity. At the same time, the La-Ce synergistic modification optimized the surface charge distribution of zeolite, improved the dispersibility of zeolite in the soap matrix, reduced agglomeration, and made full use of the effective active sites of zeolite, thereby improving the hard water resistance of laundry soap.

[0008] Optionally, the zeolite content is 20-100 parts by weight; the zeolite includes modified 4A zeolite.

[0009] Optionally, the 4A zeolite has a mesh size of 325.

[0010] Optionally, the raw materials for preparing the modified 4A zeolite include lanthanum salt and 4A zeolite.

[0011] Optionally, the raw materials for preparing the modified 4A zeolite may also include cerium salts.

[0012] Optionally, the lanthanum salt is selected from lanthanum nitrate hexahydrate; the cerium salt is selected from cerium nitrate hexahydrate.

[0013] Optionally, the preparation method of the modified 4A zeolite includes the following steps: a1. Weigh out lanthanum salt and cerium salt, add water, stir to dissolve, adjust pH to obtain La-Ce rare earth ionic liquid; a2. Weigh 4A zeolite, add water, stir, centrifuge, filter, wash, dry, and cool to obtain pretreated 4A zeolite; a3. Heat the La-Ce rare earth ionic liquid obtained in step a1 to 70-80℃, add the pretreated 4A zeolite obtained in step a2 under stirring, stir to react, cool, centrifuge, filter, wash, dry, and grind to obtain modified 4A zeolite.

[0014] Optionally, in step a1, the molar ratio of lanthanum salt to cerium salt is (1.5-4):1.

[0015] By adopting the above technical solution and controlling the molar ratio of lanthanum salt to cerium salt to be (1.5-4):1, the modified 4A zeolite prepared can better improve hard water resistance while ensuring product appearance and performance.

[0016] Optionally, in step a3, the volume ratio of the La-Ce rare earth ionic liquid obtained in step a1 to the mass ratio of the pretreated 4A zeolite obtained in step a2 is (2-4) L:1 kg.

[0017] Optionally, in step a1, the pH is adjusted to 4.5-5.5; in step a3, the pH is maintained at 4.5-5.5 during the stirring reaction.

[0018] In a second aspect, this application provides a process for preparing the laundry soap described in the first aspect, comprising the following steps: S1. Weigh out soap granules, zeolite, chelating agent, water purifier, antioxidant, fragrance, pigment, and water, and stir to obtain a mixed soap mixture. S2. Grind and refine the mixed soap material obtained in step S1 to obtain... thin Soap ingredients; S3. The fine soap material obtained in step S2 is extruded and degassed under vacuum to obtain a dense and continuous plastic soap bar. S4. Cut the plastic soap bar obtained in step S3 into pieces, cool, and package to obtain laundry soap.

[0019] Optionally, in step S2, the temperature of the soap material is controlled at 30-40℃ during grinding.

[0020] By adopting the above technical solution, in step S2, the mixed soap material is finely ground and milled, and the resulting fine soap material contains more β-crystalline phase, which can improve the transparency of the laundry soap.

[0021] Optionally, in step S3, the absolute pressure of the extruded exhaust is 50-70 kPa.

[0022] Optionally, in step S1, the fatty acid content in the soap granules is 65wt%, the chelating agent is EDTA-2Na, the water purification agent is hydroxyethyl diphosphate, the antioxidant is butylated hydroxytoluene, the fragrance is lemongrass-type fragrance, and the pigment is soap yellow G, which is more tender and stable to acids, alkalis, and heat.

[0023] In summary, the present invention has at least one of the following beneficial technical effects: 1. The laundry soap provided in this application, by using modified 4A zeolite instead of ordinary 4A zeolite, retains the Na+ zeolite framework. + Building upon ion exchange capacity, the surface-loaded rare earth ions provide additional complexation adsorption sites, enhancing the adsorption of Ca in hard water. 2+ Mg 2+ The total adsorption capacity significantly improves the hard water resistance of laundry soap.

[0024] 2. The modified 4A zeolite provided in this application optimizes the surface charge distribution of zeolite through La-Ce synergistic modification, improves the dispersibility of zeolite in the soap matrix, and reduces agglomeration. This allows the laundry soap to maintain good transparency and moderate sensory hardness while reducing the dry sodium soap content, thus balancing cost reduction and product quality. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the examples. However, those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be regarded as limiting the scope of the present invention. Specific conditions not specified in the examples shall be carried out according to conventional conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0026] Preparation Example 1 Preparation of modified 4A zeolite a1. Weigh 7 mol of lanthanum nitrate hexahydrate and 3 mol of cerium nitrate hexahydrate, add 150 L of deionized water, stir to dissolve, and slowly add 1 M dilute nitric acid to adjust the pH to 5.0 to obtain La-Ce rare earth ionic liquid. a2. Weigh 50 kg of 4A zeolite, add 100 L of deionized water, stir at room temperature for 15 min, centrifuge, filter, wash twice with deionized water, dry at 60 °C for 2 h, cool to room temperature, and obtain pretreated 4A zeolite. a3. Heat 150L of the La-Ce rare earth ionic liquid obtained in step a1 to 75℃, slowly add 50kg of the pretreated 4A zeolite obtained in step a2 while stirring, maintain the pH at 5.0, stir at 75℃ for 6h, cool to room temperature, centrifuge, filter, wash 3 times with deionized water, dry at 60℃ and 10kPa for 4h, calcine in air atmosphere at 450℃ for 3h, cool to room temperature in a desiccator, grind to obtain modified 4A zeolite.

[0027] Preparation Example 2 The difference between Preparation Example 2 and Preparation Example 1 is that, in step a1, the equimolar amount of cerium nitrate hexahydrate is replaced with lanthanum nitrate hexahydrate.

[0028] Specifically, step a1 is different, specifically: weigh 10 mol of lanthanum nitrate hexahydrate, add 150 L of deionized water, stir to dissolve, and slowly add 1 M dilute nitric acid to adjust the pH to 5.0 to obtain La rare earth ionic liquid.

[0029] Preparation Example 3 The difference between Preparation Example 3 and Preparation Example 1 is that in step a1, the equimolar amount of lanthanum nitrate hexahydrate is replaced with cerium nitrate hexahydrate.

[0030] Specifically, step a1 is different. Specifically, 10 mol of cerium nitrate hexahydrate is weighed, added to 150 L of deionized water, stirred and dissolved, and 1 M dilute nitric acid is slowly added dropwise to adjust the pH to 5.0 to obtain Ce rare earth ionic liquid.

[0031] Example 1

[0032] Example 1 provides a laundry soap comprising the following raw materials: 1000 kg soap granules, 1 kg chelating agent, 1 kg water purifier, 6 kg fragrance, 0.1 kg pigment, and 8 kg water.

[0033] Preparation process S1. Mixing: With the mixer turned on, first add soap granules, then add chelating agent, water purifier, fragrance, pigment solution (solvent is 0.4kg water), and 7.6kg water in sequence. The stirring speed is 16r / min, and the mixture is stirred for 10min to obtain the mixed soap mixture. S2. Fine grinding: The mixed soap material obtained in step S1 is fed into a refining machine for fine grinding, and then into a three-roll mill. The gap between the rollers is controlled to be 0.05 mm. Cooling water is circulated inside the rollers to control the temperature of the soap material at 35°C. The mixture is ground twice to obtain fine soap material. S3. Vacuum extrusion: The fine soap material obtained in step S2 is fed into a twin-screw vacuum extruder. The absolute pressure of the vacuum chamber is controlled at 60 kPa. The material is extruded and degassed under vacuum conditions to obtain a dense and continuous plastic soap bar. S4. Cutting, drying, and packaging: After cutting the plastic soap bar obtained in step S3 into pieces, ventilate and cool it, dry the soap, and package it to obtain laundry soap.

[0034] Example 2

[0035] Example 2 provides a laundry soap comprising the following raw materials: 1000 kg soap granules, 20 kg 4A zeolite, 1 kg chelating agent, 1 kg water purifier, 6 kg fragrance, 0.1 kg pigment, and 8 kg water.

[0036] Preparation process S1. Mixing: With the mixer turned on, first add soap granules, then add 4A zeolite, chelating agent, water purification agent, fragrance, pigment solution (solvent is 0.4kg water), and 7.6kg water in sequence. The stirring speed is 16r / min, and the mixture is stirred for 10min to obtain the mixed soap material. S2. Fine grinding: The mixed soap material obtained in step S1 is fed into a refining machine for fine grinding, and then into a three-roll mill. The gap between the rollers is controlled to be 0.05 mm. Cooling water is circulated inside the rollers to control the temperature of the soap material at 35°C. The mixture is ground twice to obtain fine soap material. S3. Vacuum extrusion: The fine soap material obtained in step S2 is fed into a twin-screw vacuum extruder. The absolute pressure of the vacuum chamber is controlled at 60 kPa. The material is extruded and degassed under vacuum conditions to obtain a dense and continuous plastic soap bar. S4. Cutting, drying, and packaging: After cutting the plastic soap bar obtained in step S3 into pieces, ventilate and cool it, dry the soap, and package it to obtain laundry soap.

[0037] Example 3

[0038] Example 3 provides a laundry soap comprising the following raw materials: 1000 kg soap granules, 40 kg 4A zeolite, 2 kg water purifier, 0.1 kg antioxidant, 5 kg fragrance, 0.1 kg pigment, and 8 kg water.

[0039] Preparation process S1. Mixing: With the mixer turned on, first add soap granules, then add 4A zeolite, water purification agent, antioxidant, fragrance, pigment solution (solvent is 0.4kg water), and 7.6kg water in sequence. The stirring speed is 16r / min, and the mixture is stirred for 10min to obtain the mixed soap material. S2. Fine grinding: The mixed soap material obtained in step S1 is fed into a refining machine for fine grinding, and then into a three-roll mill. The gap between the rollers is controlled to be 0.05 mm. Cooling water is circulated inside the rollers to control the temperature of the soap material at 35°C. The mixture is ground twice to obtain fine soap material. S3. Vacuum extrusion: The fine soap material obtained in step S2 is fed into a twin-screw vacuum extruder. The absolute pressure of the vacuum chamber is controlled at 60 kPa. The material is extruded and degassed under vacuum conditions to obtain a dense and continuous plastic soap bar. S4. Cutting, drying, and packaging: After cutting the plastic soap bar obtained in step S3 into pieces, ventilate and cool it, dry the soap, and package it to obtain laundry soap.

[0040] Example 4

[0041] Example 4 provides a laundry soap comprising the following raw materials: 1000 kg soap granules, 80 kg 4A zeolite, 2 kg water purifier, 0.1 kg antioxidant, 5 kg fragrance, 0.1 kg pigment, and 8 kg water.

[0042] Preparation process S1. Mixing: With the mixer turned on, first add soap granules, then add 4A zeolite, water purification agent, antioxidant, fragrance, pigment solution (solvent is 0.4kg water), and 7.6kg water in sequence. The stirring speed is 16r / min, and the mixture is stirred for 10min to obtain the mixed soap material. S2. Fine grinding: The mixed soap material obtained in step S1 is fed into a refining machine for fine grinding, and then into a three-roll mill. The gap between the rollers is controlled to be 0.05 mm. Cooling water is circulated inside the rollers to control the temperature of the soap material at 35°C. The mixture is ground twice to obtain fine soap material. S3. Vacuum extrusion: The fine soap material obtained in step S2 is fed into a twin-screw vacuum extruder. The absolute pressure of the vacuum chamber is controlled at 60 kPa. The material is extruded and degassed under vacuum conditions to obtain a dense and continuous plastic soap bar. S4. Cutting, drying, and packaging: After cutting the plastic soap bar obtained in step S3 into pieces, ventilate and cool it, dry the soap, and package it to obtain laundry soap.

[0043] Example 5

[0044] Example 5 provides a laundry soap comprising the following raw materials: 1000 kg soap granules, 100 kg 4A zeolite, 2 kg water purifier, 0.1 kg antioxidant, 5 kg fragrance, 0.1 kg pigment, and 8 kg water.

[0045] Preparation process S1. Mixing: With the mixer turned on, first add soap granules, then add 4A zeolite, water purification agent, antioxidant, fragrance, pigment solution (solvent is 0.4kg water), and 7.6kg water in sequence. The stirring speed is 16r / min, and the mixture is stirred for 10min to obtain the mixed soap material. S2. Fine grinding: The mixed soap material obtained in step S1 is fed into a refining machine for fine grinding, and then into a three-roll mill. The gap between the rollers is controlled to be 0.05 mm. Cooling water is circulated inside the rollers to control the temperature of the soap material at 35°C. The mixture is ground twice to obtain fine soap material. S3. Vacuum extrusion: The fine soap material obtained in step S2 is fed into a twin-screw vacuum extruder. The absolute pressure of the vacuum chamber is controlled at 60 kPa. The material is extruded and degassed under vacuum conditions to obtain a dense and continuous plastic soap bar. S4. Cutting, drying, and packaging: After cutting the plastic soap bar obtained in step S3 into pieces, ventilate and cool it, dry the soap, and package it to obtain laundry soap.

[0046] Example 6

[0047] Example 6 provides a laundry soap, which differs from Example 3 in that, in step S1, the 4A zeolite is replaced by a modified 4A zeolite prepared by the preparation method of Preparation Example 1.

[0048] Other preparation processes are the same as in Example 3.

[0049] Example 7

[0050] Example 7 provides a laundry soap, which differs from Example 3 in that, in step S1, the mass of 4A zeolite is replaced with modified 4A zeolite prepared by the preparation method of Preparation Example 2.

[0051] Other preparation processes are the same as in Example 3.

[0052] Example 8

[0053] Example 8 provides a laundry soap, which differs from Example 3 in that, in step S1, the mass of 4A zeolite is replaced with modified 4A zeolite prepared by the preparation method of Example 3.

[0054] Other preparation processes are the same as in Example 3.

[0055] Performance testing The laundry soaps prepared in Examples 1-8 were conformed to the laundry soap standard QB / T2486-І (referencing compound laundry soap QB / T2487). The following performance tests were performed on the laundry soaps prepared in Examples 1-8: Dry sodium soap content: determined according to QB / T 2623.3-2003; Hardness: The laundry soaps prepared in Examples 1-8 (soap core temperature 23±5℃) were placed horizontally on the test platform. A Ф30mm hard alloy ball was placed on a relatively flat structural plane of the soap body. If the structural plane was not flat, it was trimmed into a flat plane with a blade to facilitate the measurement of the indentation diameter. A 10kg weight was gently placed on the weighing platform so that the weight of the weight could act on the soap body through the alloy ball. The action time was 3 minutes. Then the weight and alloy ball were removed. The diameter of the indentation left by the alloy ball on the soap body was measured with calipers, accurate to 0.5mm. The larger the indentation diameter, the softer the soap body. Three parallel samples were set up for each group of experiments, and the average value of the results was taken. Sensory hardness: After drying for 24 hours, squeeze or break the soap body by hand to test the hardness of the laundry soap by sensory evaluation. Transparency: Determined according to Appendix A of QB / T 2485-2008; Foaming power: as specified in GB / T7462-1994; Hardness test Preparation of calcium hard water: Dissolve 16.65g of anhydrous calcium chloride in water, dilute to 1L, and store in a reagent bottle as a stock solution. This stock solution contains approximately 150mmol / L of calcium ions per liter. Then, standardize the stock solution according to A.4.2 in Appendix A of QB / T2486-2008 and prepare a 75mmol / L calcium hard water solution. Preparation of 2.0% concentration soap solution: Weigh 2.0g of laundry soap, dissolve it in about 50mL of hot distilled water (55-60℃), quantitatively transfer the soap solution to a 100mL volumetric flask, then wash all the soap solution in the beaker into the volumetric flask with hot distilled water, dilute to the mark, shake well and keep warm (not lower than 40℃) for later use. Test experiment procedure: Use a graduated cylinder to take 40 mL of hot distilled water (about 40°C), pour it into a 50 mL Nessler colorimetric tube, use a 5.0 mL pipette to draw 5.0 mL of 2.0% concentration soap solution into the Nessler colorimetric tube, then add hot distilled water dropwise to the graduation line (50 mL), shake well, and keep the temperature at (40±2)°C. Use a 5.0 mL burette to add 3.0 mL of calcium hard water dropwise into the Nessler colorimetric tube in several portions (no less than 3 times). Cap the tube, turn it upside down slowly, then restore it to the original position slowly, try to avoid air bubbles, repeat the upside-down-restoration operation 10 times for about 1 second each time, observe the soap solution in the colorimetric tube (preferably with the help of lamplight). If no colloidal precipitate or coagulum appears in the soap solution, the hard water resistance of this soap is not less than 3.0 mL (if the soap solution is an emulsion but still no colloidal precipitate or coagulum appears, it is also considered qualified). On the premise of being qualified, keep the temperature of the soap solution at (40±2)°C, add calcium hard water into the Nessler colorimetric tube in several portions, about 0.1 mL each time, shake well and observe according to the above method after each addition, until a small amount of colloidal precipitate (or coagulum) appears, record the reading, which is the hard water resistance; Note: 1. Avoid the precipitate in the soap solution itself when drawing the soap solution; 2. A small amount of granular precipitate will appear during titration, which is different from the colloidal precipitate; Moisture: Test according to the provisions of QB / T2623.4-2003; Ethanol-insoluble matter: Determined according to QB / T 2623.5-2003; Mushiness degree: The laundry soap prepared from the same batch of Examples 1-8, which has no any scars on the surface after being placed for 24 hours, is cut upright into a soap bar of 4×1.5 cm size, a submersion marking line is drawn, the soap bar is immersed in distilled water at 22±4°C until the liquid level wets to the marking line, soak for 2 hours, take out the soap bar, drain the water drops, weigh W1, scrape off the mushy layer on the surface of the soap bar with a blunt blade, place it for 24 hours and then weigh W2, calculate the mushiness degree, and the calculation of the mushiness degree is as follows: Mushiness degree: g / 50cm 2 =50×(W1-W2) / A; In the formula, A represents the immersion area of the soap bar, cm 2 ; W1 represents the wet weight of the soap bar, g; W2 represents the weight of the soap bar after removing the mushy layer and drying, g; Crack Degree: Laundry soaps prepared in Examples 1-8 without any surface scratches were each suspended by inserting a pointed lead wire into one end. They were then placed in beakers containing water at 40°C and 150 ppm hardness, ensuring the soap did not touch the beaker walls. Two-thirds of the soap was immersed in the water for 1 hour, then removed (the water temperature should not be lower than 18°C, mainly to prevent rapid natural cooling in winter). The soaps were then hung to dry for 24 hours. The results were judged according to the following criteria: (Level 0: No cracks; Level 2: Crack traces; Level 4: Shallow and short cracks; Level 6: Moderate short cracks; Level 8: Numerous short cracks or several medium-length cracks; Level 10: A deep and long crack almost running the length of the soap; Level 12: Several deep and long cracks almost running the length of the soap). The results are shown in Table 1.

[0056] Table 1

[0057] Conclusion Analysis and Summary Based on Examples 1-5 and Table 1, it can be seen that after adding 4A zeolite to the raw materials, the sodium soap content decreases sequentially with the increase of the amount of 4A zeolite added, the sensory hardness increases sequentially after drying for 24 hours, and the defoaming power and transparency of deionized water decrease, but all meet the standards. Other properties of Examples 1-5 also meet the standards. Furthermore, with the increase of the amount of 4A zeolite added, the resistance to hard water also gradually increases.

[0058] Based on Examples 3, 6-8, and Table 1, it can be seen that replacing 4A zeolite with modified 4A zeolite improves the foaming power, transparency, and hard water resistance of laundry soap. In Example 6, when the molar ratio of La to Ce is 7:3, the foaming power and hard water resistance of the laundry soap are superior to those achieved by using La-modified 4A zeolite alone in Example 7 and by using Ce-modified 4A zeolite alone in Example 8. This indicates that La-Ce dual rare earth synergistic modification has a better hard water softening effect than single rare earth modification.

[0059] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the products, methods and principles of this application should be covered within the scope of protection of this application.

Claims

1. A laundry soap, characterized in that, It includes the following raw materials in parts by weight: 900-1100 parts by weight of soap granules, 0-100 parts by weight of zeolite, 0-1 parts by weight of chelating agent, 1-2 parts by weight of water purifier, 0-0.1 parts by weight of antioxidant, 5-6 parts by weight of fragrance, 0.05-0.15 parts by weight of pigment, and 7-9 parts by weight of water. The zeolite is selected from 4A zeolite or modified 4A zeolite.

2. The laundry soap according to claim 1, characterized in that, The raw materials for preparing the modified 4A zeolite include lanthanum salt and 4A zeolite.

3. The laundry soap according to claim 2, characterized in that, The raw materials for preparing the modified 4A zeolite also include cerium salts.

4. The laundry soap according to claim 3, characterized in that, The preparation method of the modified 4A zeolite includes the following steps: a1. Weigh out lanthanum salt and cerium salt, add water, stir to dissolve, adjust pH to obtain La-Ce rare earth ionic liquid; a2. Weigh 4A zeolite, add water, stir, centrifuge, filter, wash, dry, and cool to obtain pretreated 4A zeolite; a3. Heat the La-Ce rare earth ionic liquid obtained in step a1 to 70-80℃, add the pretreated 4A zeolite obtained in step a2 under stirring, stir to react, cool, centrifuge, filter, wash, dry, and grind to obtain modified 4A zeolite.

5. The laundry soap according to claim 4, characterized in that, In step a1, the molar ratio of lanthanum salt to cerium salt is (1.5-4):

1.

6. The laundry soap according to claim 4, characterized in that, In step a3, the volume ratio of the La-Ce rare earth ionic liquid obtained in step a1 to the mass ratio of the pretreated 4A zeolite obtained in step a2 is (2-4) L: 1 kg.

7. The laundry soap according to claim 4, characterized in that, In step a1, the pH is adjusted to 4.5-5.5; in step a3, the pH is maintained at 4.5-5.5 during the stirring reaction.

8. A process for preparing laundry soap according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Weigh out soap granules, zeolite, chelating agent, water purifier, antioxidant, fragrance, pigment, and water, and stir to obtain a mixed soap mixture. S2. Grind the mixed soap material obtained in step S1 to obtain fine soap material; S3. The fine soap material obtained in step S2 is extruded and degassed under vacuum to obtain a dense and continuous plastic soap bar. S4. Cut the plastic soap bar obtained in step S3 into pieces, cool, and package to obtain laundry soap.

9. The preparation process of the laundry soap according to claim 8, characterized in that, In step S2, the temperature of the soap material is controlled at 30-40℃ during grinding.

10. The preparation process of the laundry soap according to claim 8, characterized in that, In step S3, the absolute pressure of the extruded exhaust is 50-70 kPa.

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