Laundry sheet and preparation method thereof

Abstract

The invention discloses a laundry sheet and a preparation method thereof, and relates to the technical field of daily chemicals, and the laundry sheet is prepared from the following raw materials in parts by weight: 20-50 parts of a surfactant, 20-40 parts of modified starch, 10-20 parts of modified cellulose, 5-10 parts of edible gum, 1-5 parts of sodium bicarbonate, 0.1-5 parts of a functional aid, 0.1-2 parts of a release agent and 10-20 parts of water. According to the laundry sheet, modified starch serves as a carrier, modified cellulose and edible gum are added, the modified starch and long-chain modified cellulose are bonded and wound through the gluing effect of the edible gum, then the flexibility of the laundry sheet is greatly improved, and meanwhile the edible gum has the water absorption effect and can prevent the laundry sheet from cracking and dusting. In addition, the added release agent also has an anti-adhesion effect.

Description

Technical Field

[0001] The invention relates to the technical field of daily chemicals, and in particular to a laundry tablet and a preparation method thereof. Background Art

[0002] Laundry tablets are becoming more and more popular with consumers because they are easy to carry. In order to have a sheet-shaped molding effect, existing laundry tablets usually use water-soluble polyvinyl alcohol as a carrier or encapsulation material. However, due to the poor degradation ability of polyvinyl alcohol, the use of laundry tablets with polyvinyl alcohol as a carrier is limited because they cannot meet environmental protection requirements. In order to reduce the impact of polyvinyl alcohol on the environment, a Chinese invention patent with publication number CN115362245A discloses a laundry tablet, which uses polyvinyl alcohol and plant starch in combination, and replaces part of the polyvinyl alcohol with plant starch with good biodegradability to reduce the amount of polyvinyl alcohol. However, in this laundry tablet, it is still impossible to completely avoid adding polyvinyl alcohol. This is because the flexibility of the plant starch after solidification is insufficient, which makes the sheet easy to break or crack at low temperatures and easy to stick at high temperatures, resulting in limited use.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a laundry tablet and a preparation method thereof, aiming to solve the defect of insufficient toughness of the existing environmentally friendly laundry tablets.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A laundry tablet, wherein the raw materials for preparing the laundry tablet include, by weight: 20-50 parts of surfactant, 20-40 parts of modified starch, 10-20 parts of modified cellulose, 5-10 parts of edible gum, 1-5 parts of sodium bicarbonate, 0.1-5 parts of functional additives, 0.1-2 parts of release agent, and 10-20 parts of water.

[0007] In the laundry tablet, the edible gum includes at least one of sodium alginate, xanthan gum, gum arabic, guar gum and pectin.

[0008] In the laundry tablet, the modified cellulose is anionic or nonionic modified cellulose or anionic or nonionic modified hemicellulose.

[0009] In the laundry tablet, the modified starch is plant root starch modified by thermophilic or thermostable maltose transglucosylase.

[0010] In the laundry tablet, the weight average molecular weight of the modified starch is 10,000 to 20,000.

[0011] In the laundry tablet, the plant root starch includes one of potato starch, cassava starch, sweet potato starch and kudzu starch.

[0012] In the laundry tablet, the functional additive includes one or more of flavors, flavor microcapsules, softeners, bioenzyme preparations, and antibacterial agents.

[0013] In the laundry tablet, the release agent is glycerol or glycerol polymer.

[0014] A method for preparing a laundry tablet, wherein the method is used to prepare the laundry tablet as described above, and the method comprises the steps of:

[0015] Step S1, taking a surfactant, modified starch, modified cellulose, edible gum, sodium bicarbonate, and a functional additive according to a ratio, stirring and mixing, then adding water and a release agent, stirring and mixing, and obtaining a mixed material;

[0016] Step S2, putting the mixed material into a screw extruder, and mixing, heating, melting, gelatinizing and ripening the material through screw extrusion;

[0017] Step S3, extruding the matured material from an extrusion die frame and cooling it to form a laundry sheet by cutting it.

[0018] In the method for preparing laundry tablets, in step S2, the internal temperature of the screw extruder barrel is controlled to be 3-5°C higher than the maturation temperature of the modified starch; in step S3, the temperature of the mold frame is controlled to be 3-5°C lower than the melting temperature of the modified starch.

[0019] Beneficial effects:

[0020] The present invention provides a laundry tablet, which uses modified starch as a carrier, adds modified cellulose and edible glue, and utilizes the adhesive effect of the edible glue to bond and entangle the modified starch and the long-chain modified cellulose, thereby greatly improving the flexibility of the laundry tablet. At the same time, the edible glue has a water-absorbing effect, which can prevent the laundry tablet from cracking and falling into powder. In addition, in order to facilitate extrusion molding, a release agent is added, and the release agent also has an anti-adhesion effect.

[0021] The second aspect of the present invention discloses a method for preparing a laundry sheet, which adopts a screw extrusion molding method. At the moment of extrusion, the pressure is released, so that the compressed bubbles on the surface and inside of the sheet expand due to the sudden reduction in pressure, so that the extruded laundry sheet forms a loose and porous structure, which is conducive to its dissolution; at the same time, during the mixed material extrusion process, the release agent migrates to the surface of the material, thereby forming an isolation film on the surface of the sheet to prevent the sheet from sticking due to water absorption. DETAILED DESCRIPTION

[0022] The present invention provides a laundry tablet and a preparation method thereof. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail by the following embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] The invention provides a laundry tablet. The raw materials for preparing the laundry tablet include, by weight, 20 to 50 parts of a surfactant, 20 to 40 parts of modified starch, 10 to 20 parts of modified cellulose, 5 to 10 parts of edible glue, 1 to 5 parts of sodium bicarbonate, 0.1 to 5 parts of a functional auxiliary agent, 0.1 to 2 parts of a release agent, and 10 to 20 parts of water. Among them, the surfactant is used to remove stains or oil stains on clothes; the modified starch is used as a carrier of the surfactant, which is soluble in water and has good biodegradability; the modified cellulose is used as a molding agent and can improve the toughness of the sheet; the edible glue can improve the flexibility of the laundry tablet, and without adding polyvinyl alcohol, the flexibility of the laundry tablet meets the requirements and does not break when bent; the sodium bicarbonate can be decomposed during the preparation process, forming pores on the surface and inside of the laundry tablet, which can expand the specific surface area of ​​the laundry tablet, and when used, can accelerate the dissolution rate of the laundry tablet; the functional additive can make the laundry tablet have the effect of enhancing fragrance, softening or improving the decontamination effect; the release agent can improve the lubricity of the material, prevent the material from sticking to the wall during the preparation process, and at the same time, it can also prevent the laundry tablet from sticking.

[0024] The above laundry tablet uses modified starch as a carrier, adds modified cellulose and edible glue, and utilizes the adhesive effect of edible glue to bond and entangle the modified starch and the long-chain modified cellulose, thereby greatly improving the flexibility of the laundry tablet. At the same time, the edible glue has a water-absorbing effect, which can prevent the laundry tablet from cracking and falling into powder. Therefore, the above laundry tablet can still meet the flexibility requirements when used without adding polyvinyl alcohol, and the modified starch, modified cellulose and edible glue can all be naturally degraded, meeting environmental protection requirements.

[0025] In a preferred embodiment, the edible gum includes at least one of sodium alginate, xanthan gum, gum arabic, guar gum, and pectin, and preferably a combination of multiple types, such as a combination of any two, three or more types, especially a combination of xanthan gum and its species, such as a combination of xanthan gum and sodium alginate, or a combination of xanthan gum and sodium alginate and gum arabic, or a combination of xanthan gum and guar gum or pectin, etc. The xanthan gum not only has a good gelling effect during and after molding, but also can cause stains to flocculate and precipitate during the subsequent use of the laundry tablet, thereby improving the decontamination ability of the laundry tablet.

[0026] Specifically, the modified cellulose is anionic or nonionic modified cellulose or anionic or nonionic modified hemicellulose, which has a faster and better molding effect. It should be noted that the anionic or nonionic modified cellulose and anionic or nonionic modified hemicellulose are purchased from Nanfeng County Daxin Technology Co., Ltd.

[0027] Specifically, the modified starch is plant rhizome starch modified by thermophilic or thermoresistant maltose transglucosylase, wherein the plant rhizome starch includes potato starch, cassava starch, sweet potato starch, and kudzu starch. This type of starch has a high content of amylopectin, which can better entangle with long-chain modified cellulose to increase the toughness of the sheet; and after modification by thermophilic or thermoresistant maltose transglucosylase, the content of amylopectin can be further increased, thereby further improving the toughness.

[0028] Since the molecular weight of the modified starch will affect its melting temperature (equivalent to the molding temperature), and the melting temperature of the modified starch will affect the formation of pores, in a preferred embodiment, the weight average molecular weight of the modified starch is 6000-10000. The modified starch with this weight average molecular weight can make the melting temperature of the laundry tablet approximately in the temperature range of 55-80°C, and sodium bicarbonate begins to decompose at 50°C, so the decomposition of sodium bicarbonate can be close to the molding temperature of the laundry tablet, so that the generated bubbles can form pores in the laundry tablet, and these pores can subsequently introduce water during use to make the laundry tablet quickly disintegrate.

[0029] Preferably, the weight average molecular weight of the modified starch is 8000-9000, which can better retain the pores formed by sodium bicarbonate and make the sheet more tough.

[0030] In the aforementioned laundry tablets, the added functional additives can make the laundry tablets have more functions. For example, laundry tablets added with essence or essence microcapsules have the effect of retaining fragrance on clothes, especially laundry tablets added with essence microcapsules, which have a more lasting function of retaining fragrance on clothes; laundry tablets added with non-ionic softeners make clothes softer; laundry tablets added with biological enzyme preparations have better decontamination effects; laundry tablets added with antibacterial agents have antibacterial and sterilization effects. Therefore, in a preferred embodiment, the functional additives include one or more of essence, essence microcapsules, non-ionic softeners, biological enzyme preparations, and antibacterial agents. In the actual preparation process, the corresponding functional ingredients can be added according to the needs of use, and then a laundry tablet with special effects can be obtained.

[0031] In a preferred embodiment, the release agent is glycerol or glycerol polymer, which has a lubricating effect and can prevent the material from sticking to the inner wall of the screw barrel during the preparation process, thereby ensuring that the material can be smoothly extruded and formed; at the same time, the release agent is easy to migrate to the surface of the material during the extrusion process, so after extrusion molding, it is located on the surface of the sheet, thereby playing an isolation role. Even if the edible glue is easy to absorb water, the isolation effect of the release agent will prevent the sheets from sticking to each other.

[0032] The second aspect of the present invention further discloses a method for preparing a laundry tablet, which is used to prepare the laundry tablet as described above, and the method comprises the following steps:

[0033] Step S1, taking a surfactant, modified starch, modified cellulose, edible gum, sodium bicarbonate, and a functional additive according to a ratio, stirring and mixing, then adding water and a release agent, stirring and mixing, and obtaining a mixed material;

[0034] Step S2, putting the mixed material into a screw extruder, and mixing, heating, melting, gelatinizing and maturing the material through screw extrusion, and controlling the internal temperature of the screw extruder barrel to be 3-5° C. higher than the maturation temperature of the modified starch;

[0035] Step S3, when the material is conveyed to the extrusion die frame, the temperature of the die frame is controlled to be 3-5° C. lower than the melting temperature of the modified starch, and after extrusion and cooling and forming, the laundry tablets are obtained by cutting.

[0036] In this preparation method, the materials can be mixed by a screw extruder, and during the extrusion process, the friction force is used to heat the materials to reach the ripening condition; at the same time, in the screw extruder, the gas generated by the decomposition of sodium bicarbonate will be embedded in the materials and cannot overflow, forming high-pressure bubbles, and when the materials enter the mold frame, the materials begin to form by cooling down, and at the moment when the materials are extruded from the mold frame, the pressure is suddenly released, and the high-pressure bubbles in the laundry tablets will expand and partially overflow, making the laundry tablets loose, and forming micropores on the surface of the laundry tablets, which facilitate water to penetrate into the laundry tablets and accelerate the disintegration rate of the laundry tablets in water. In addition, during the extrusion process, the release agent will migrate to the surface to ensure that the materials can be smoothly output. At the same time, the release agent that migrates to the surface has an isolation effect, which can prevent the adhesion phenomenon caused by the absorption of water by the edible glue.

[0037] It should be noted that in order to facilitate the temperature control of the inside of the screw and the mold frame, a heating mechanism is provided outside the barrel and a cooling mechanism is provided outside the mold frame to ensure that the temperature of the material meets the requirements at each stage.

[0038] To further illustrate a laundry tablet and a preparation method thereof provided by the present invention, the following examples are provided.

[0039] Example 1

[0040] A laundry tablet. The raw materials for preparing the laundry tablet are composed of 40 parts of surfactant, 31 parts of modified starch, 18 parts of anionic modified cellulose, 4 parts of sodium alginate, 4 parts of xanthan gum, 3 parts of sodium bicarbonate, 1 part of functional additive, 1 part of release agent and 15 parts of water in a weight ratio of 1:1.

[0041] The preparation steps of the laundry tablet are:

[0042] Step S1, taking a surfactant, modified starch, modified cellulose, edible gum, sodium bicarbonate, and a functional additive according to a ratio, stirring and mixing, then adding water and a release agent, stirring and mixing, and obtaining a mixed material;

[0043] Step S2, putting the mixed material into a screw extruder, and mixing, heating, melting, gelatinizing and maturing the material through screw extrusion, and controlling the internal temperature of the screw extruder barrel to be 5° C. higher than the maturation temperature of the modified starch;

[0044] Step S3: When the material is transported to the extrusion die frame, the temperature of the die frame is controlled to be 5° C. lower than the melting temperature of the modified starch. After extrusion and cooling, the laundry tablets are obtained by cutting.

[0045] Example 2

[0046] A laundry tablet. The raw materials for preparing the laundry tablet are composed of 20 parts by weight of a surfactant, 20 parts of modified starch, 10 parts of anionic modified hemicellulose, 5 parts of xanthan gum, 5 parts of gum arabic, 1 part of sodium bicarbonate, 0.1 part of a functional auxiliary agent, 0.1 part of a release agent, and 10 parts of water. The edible gum is a mixture in a weight ratio of 1:1.

[0047] The preparation steps of the laundry tablet are basically the same as those of Example 1.

[0048] Example 3

[0049] A laundry tablet comprises the following raw materials, measured by weight: 50 parts of a surfactant, 40 parts of modified starch, 10 parts of anionic modified cellulose, 10 parts of anionic modified hemicellulose, 5 parts of xanthan gum, 5 parts of sodium bicarbonate, 5 parts of a functional auxiliary agent, 2 parts of a release agent and 20 parts of water.

[0050] The preparation steps of the laundry tablet are basically the same as those of Example 1.

[0051] Comparative Example 1

[0052] A laundry tablet, whose raw material composition and preparation steps are basically the same as those of Example 1, except that the raw material composition does not contain edible glue.

[0053] Comparative Example 2

[0054] A laundry tablet, whose raw material composition and preparation steps are basically the same as those of Example 1, except that the raw material composition does not contain anionic modified cellulose.

[0055] Comparative Example 3

[0056] A laundry tablet, whose raw material composition and preparation steps are basically the same as those of Example 1, except that the raw material composition does not contain edible gum and anionic modified cellulose.

[0057] Comparative Example 4

[0058] A laundry tablet, the raw material composition of which is substantially the same as that of Example 1, except that the raw material composition does not contain a release agent.

[0059] Since no release agent was added to the laundry tablet raw materials of Comparative Example 4, it was found that it was impossible to form a sheet through a screw extruder. The preparation method was as follows: the materials were stirred and mixed, and then after aging, they were rolled into sheets, and then cut to obtain laundry tablets.

[0060] It should be noted that in Examples 1-3 and Comparative Examples 1-4, the modified starches involved are all thermophilic maltose transglucosylase-modified potato starch with a weight average molecular weight of 80,000; the surfactants involved are all a mixture of sodium fatty methyl ester sulfonate and cocamidopropyl betaine in a weight ratio of 1:1; the functional additives involved are all flavors; and the release agents involved are all glycerol.

[0061] Performance Testing

[0062] The laundry tablets prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to the following performance tests:

[0063] Biodegradation test: According to OECD 301B, the biodegradation rate of laundry tablets is measured in 28 days;

[0064] Forming stability: Place the washing tablet in a test environment at a temperature of (25±2)℃ and a humidity of (40±5)% for 48 hours, then bend the washing tablet by hand to align and overlap the two sides, and observe whether the washing tablet breaks;

[0065] Moisture resistance stability: stack two detergent sheets on top of each other and place them in a test environment with a temperature of (25±2)℃ and a humidity of (85±5)% for 48 hours, then separate the two detergent sheets and observe whether there is adhesion between the sheets. Adhesion phenomena are divided into no adhesion, slight adhesion and obvious adhesion;

[0066] Dissolution rate: Place a 10cmx10cmx2mm laundry tablet in 1L of water and measure whether the dissolution time exceeds 10s.

[0067] Detergency test: According to GB / T 13174-2021 "Determination of Detergency and Cycle Washing Performance of Detergents for Clothes", the test specimens are JB-01 dirty cloth, JB-02 dirty cloth, and JB-03 dirty cloth, and the detergency ratio Pi of the detergent sheet is obtained, where Pi ≥ 1.0 is qualified and < 1.0 is unqualified.

[0068] The specific test results are shown in Table 1.

[0069]

[0070]

[0071] As can be seen from Table 1, the degradation rates of the laundry tablets described in Examples 1-3 are relatively high within 28 days, which is related to the fact that the carrier materials used are all degradable substances; the molding stability of Examples 1-3 is very good, and no breakage occurs when bent, indicating that the toughness is good; the moisture resistance stability of Examples 1-3 is also good. Although the added edible glue will absorb water, due to the addition of the release agent, the release agent will migrate to the surface of the sheet during extrusion, thereby playing an anti-adhesion role; in addition, the detergency of Examples 1-3 is also good, and all can meet the requirements.

[0072] However, in the molding stability tests of Comparative Examples 1-3, there were cases of breakage, which was mainly due to the fact that no edible gum or modified cellulose was added. It can be seen that edible gum and modified cellulose are key factors that directly affect the toughness of laundry tablets.

[0073] The moisture resistance stability of comparative example 4 is poor, so the laundry tablet is prone to sticking when exposed to the air. This is mainly because there is no release agent on its surface and it cannot play a barrier role. Therefore, after the xanthan gum absorbs water, it is easy to stick.

[0074] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims

1. A laundry tablet, characterized in that: The raw materials for preparing the laundry tablet include, by weight: 20 to 50 parts of surfactant, 20 to 40 parts of modified starch, 10 to 20 parts of modified cellulose, 5 to 10 parts of edible gum, 1 to 5 parts of sodium bicarbonate, 0.1 to 5 parts of functional additives, 0.1 to 2 parts of release agent, and 10 to 20 parts of water.

2. The laundry tablet according to claim 1, characterized in that: The edible gum includes at least one of sodium alginate, xanthan gum, gum arabic, guar gum and pectin.

3. The laundry tablet according to claim 1, characterized in that: The modified cellulose is anionic or nonionic modified cellulose or anionic or nonionic modified hemicellulose.

4. The laundry tablet according to claim 1, characterized in that: The modified starch is plant root starch modified by thermophilic or thermoresistant maltose transglucosylase.

5. The laundry tablet according to claim 4, characterized in that: The weight average molecular weight of the modified starch is 10,000 to 20,000.

6. The laundry tablet according to claim 4, characterized in that: The plant root starch includes one of potato starch, cassava starch, sweet potato starch and kudzu root starch.

7. The laundry tablet according to claim 1, characterized in that: The functional additives include one or more of flavors, flavor microcapsules, softeners, bioenzyme preparations, and antibacterial agents.

8. The laundry tablet according to claim 1, characterized in that: The release agent is glycerol or glycerol polymer.

9. A method for preparing a laundry tablet, characterized in that: For preparing the laundry tablet according to any one of claims 1 to 8, the method comprises the steps of: Step S1, taking a surfactant, modified starch, modified cellulose, edible gum, sodium bicarbonate, and a functional additive according to a ratio, stirring and mixing, then adding water and a release agent, stirring and mixing, and obtaining a mixed material; Step S2, putting the mixed material into a screw extruder, and mixing, heating, melting, gelatinizing and ripening the material through screw extrusion; Step S3, extruding the matured material from an extrusion die frame, cooling and forming the material, and then cutting the material to obtain a laundry tablet.

10. The method for preparing a laundry tablet according to claim 9, characterized in that: In the step S2, the internal temperature of the screw extruder barrel is controlled to be 3-5°C higher than the ripening temperature of the modified starch; in the step S3, the temperature of the mold frame is controlled to be 3-5°C lower than the melting temperature of the modified starch.

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