Whitening and decontaminating laundry sheet and preparation method thereof

Abstract

The invention relates to the field of washing products, in particular to a whitening and decontaminating laundry sheet and a preparation method thereof. The whitening and decontaminating laundry sheet comprises a film-forming agent, an anionic surfactant, a nonionic surfactant, a fluorescent whitening agent, an anti-fouling agent, an enzyme preparation, a plant extract, a chelating agent and an auxiliary agent, the film-forming agent comprises a film-forming agent A and a film-forming agent B; the film-forming agent A is polyvinyl alcohol, and the film-forming agent B comprises one or more of polyvinylpyrrolidone and modified polyvinyl alcohol; the anionic surfactant comprises sodium alkyl sulfate, sodium fatty acid methyl ester sulfonate and sodium alpha-olefin sulfonate; the nonionic surfactant is prepared from polyglycerol fatty acid ester, fatty alcohol-polyoxyethylene ether, fatty acid methyl ester ethoxylate and alkyl glucoside. The whitening and decontaminating laundry sheet is high in dissolvability, has a remarkable whitening effect on fabrics, has decontaminating power, and has the advantages of being convenient to carry and use, free of solid matter residues after being used and the like.

Description

Technical Field

[0001] The present application relates to the field of washing products, and more specifically, to a whitening and decontamination laundry tablet and a preparation method thereof. Background Art

[0002] As fabric substrates age, their colors tend to fade or turn yellow due to exposure to light and the natural degradation of fibers in the air. Currently, brighteners are often used to solve problems such as yellowing of fabrics. The whitening effect of fluorescent brighteners is actually an optical effect that will not damage the fiber structure of clothing or textiles, but fluorescent brighteners can only make fabrics whiter and cannot improve the cleanliness of fabrics.

[0003] The content of whitening agent in current detergents is usually 0.1%-0.5%, which is a trace amount. Therefore, during the washing process, the whitening effect of fabrics is not significant.

[0004] Most of the detergents on the market that have a whitening effect on fabrics are in liquid form.

[0005] For example, CN202010444733.X and CN201610101477.8 provide technical solutions for liquid fluorescent whitening agent compositions, which have a fluorescent whitening agent content of up to 30%, but do not have the ability to wash and remove dirt and have a short shelf life.

[0006] For example, CN202310421252.0 and CN201610643400.3 provide technologies for whitening laundry detergents with washing effects, and the content of fluorescent brighteners does not exceed 10%. Whether it is a whitening agent or a whitening laundry detergent, it is difficult to control the amount in actual use. If the undiluted whitening laundry detergent directly contacts the fabric, it is easy for the whitening agent to be quickly adsorbed onto the fabric, causing uneven whitening and color spots.

[0007] Currently, the fabric whitening tablets on the market mainly use fiber cloth as a carrier to bond or adsorb a large amount of whitening agent, which also does not have the function of cleaning and washing. For example, the technology of whitening tablets provided in CN201910736357.9 and CN201910713427.9. Although the whitening tablets are light and easy to carry, there are still the following problems in actual use: (1) The bonded fluorescent whitening agent is easy to fall off and migrate, resulting in poor whitening effect; (2) The fiber cloth is easily wrapped by the fabric, which easily causes local color difference during washing; (3) The fibers that fall during the washing process are easy to adhere to the fabric, causing secondary processing; (4) After washing, the fiber cloth still needs to be manually discarded and processed by the user.

[0008] Based on the above problems, it is urgent to find solutions. Summary of the invention

[0009] In order to solve the above problems, the present application provides a whitening and decontamination laundry tablet and a preparation method thereof. The whitening and decontamination laundry tablet obtained by the present technical solution has strong solubility, good whitening effect on fabrics, and decontamination ability, and is easy to carry, convenient to use, suitable for all washing equipment, and no solid residue after use.

[0010] The whitening laundry tablets prepared in the present application wrap the fluorescent whitening agent inside the laundry tablets, which can effectively prevent the fluorescent whitening agent from falling off and migrating during the product use process; and avoid the use of chemical preservatives by adding plant extracts, and have good development prospects.

[0011] In the first aspect, the present application provides a whitening and decontamination laundry tablet, which adopts the following technical solution:

[0012] A whitening and decontamination laundry tablet is prepared by drying a slurry, wherein the slurry comprises the following raw materials in terms of mass percentage:

[0013] 10-30% film former, 10-30% anionic surfactant, 3-10% nonionic surfactant, 11-30% fluorescent brightener, 0.5-5% antifouling agent, 0.5-5% enzyme preparation, 0.1-1% plant extract, 0.5%-5% chelating agent, 0.5-5% auxiliary agent, water;

[0014] The film-forming agent at least includes a film-forming agent A and a film-forming agent B; the film-forming agent A is polyvinyl alcohol, and the film-forming agent B includes one or more of polyvinyl pyrrolidone and modified polyvinyl alcohol;

[0015] The anionic surfactant includes at least sodium alkyl sulfate, sodium fatty acid methyl ester sulfonate, and sodium α-olefin sulfonate;

[0016] The nonionic surfactant includes one or more of polyglycerol fatty acid esters, fatty alcohol polyoxyethylene ethers, isomeric alcohol polyoxyethylene ethers, secondary alcohol polyoxyethylene ethers, fatty acid methyl ester ethoxylates, alcohol ether glycosides, and alkyl glucosides.

[0017] Preferably, the film former is 15-25%, the anionic surfactant is 10-20%, the nonionic surfactant is 3-5%, the fluorescent whitening agent is 15-25%, and the enzyme preparation is 1-3.5%.

[0018] By adopting the above technical solution, polyhydroxy polymers such as polyvinyl alcohol and polyvinyl pyrrolidone are used as film-forming agents and are strongly hydrogen-bonded with fluorescent whitening agents to form water-soluble polymer complexes. After forming, the film-forming agent "encapsulates" the fluorescent whitening agent, reducing the photodegradation and photoisomerization of the fluorescent whitening agent during processing and storage. Due to the special structure of the water-soluble polymer complex, the laundry tablet has good water solubility. When it is put into water for washing, it can be quickly dissolved and dispersed in water, reducing the risk of uneven whitening and color spots caused by direct contact of the fluorescent whitening agent with the fabric.

[0019] Too little whitening agent is added to the detergent, and the fabric cannot be significantly whitened, while adding a high content of fluorescent whitening agent has certain technical difficulties. This is because fluorescent whitening agents easily complex divalent and trivalent metal ions to form precipitation, and their whitening effect is reduced when used in hard water. However, the present application forms a water-soluble polymer complex by combining polyhydroxy polymers such as polyvinyl alcohol and polyvinyl pyrrolidone with fluorescent whitening agents with strong hydrogen bonds. When the whitening and decontamination laundry tablet is dissolved in water, it can avoid or slow down the direct combination of fluorescent whitening agents with metal ions such as calcium and magnesium in water, thereby ensuring the whitening effect of the whitening and decontamination laundry tablet in hard water. Under the joint coordination of specific film-forming agents, anionic surfactants, and nonionic surfactants, a large amount of fluorescent whitening agents can be added to the prepared laundry tablet, which effectively and significantly whitens the fabric. And under this specific coordination, the prepared laundry tablet has good moisture resistance, and can exert the decontamination effect of anionic surfactants and nonionic surfactants as much as possible during use, thereby achieving the effect of efficient whitening and decontamination.

[0020] Preferably, the film-forming agent A is 10-20%, and the film-forming agent B is 1-5%;

[0021] Preferably, the film-forming agent is film-forming agent A and film-forming agent B; film-forming agent A is polyvinyl alcohol, and film-forming agent B is polyvinyl pyrrolidone or modified polyvinyl alcohol;

[0022] Preferably, the modified polyvinyl alcohol is carboxylated polyvinyl alcohol and / or sulfonated polyvinyl alcohol.

[0023] Preferably, the anionic surfactant is sodium alkyl sulfate, sodium fatty acid methyl ester sulfonate, sodium α-olefin sulfonate;

[0024] Preferably, the sodium alkyl sulfate is 8-15%, the sodium fatty acid methyl ester sulfonate is 1-5%, and the sodium α-olefin sulfonate is 1-3%.

[0025] Preferably, the nonionic surfactant is polyglycerol fatty acid ester, fatty alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate, or alkyl glucoside.

[0026] Preferably, the fatty alcohol polyoxyethylene ether includes one or more of fatty alcohol polyoxyethylene ether EO-7 and fatty alcohol polyoxyethylene ether EO-3.

[0027] Preferably, the content of fatty alcohol polyoxyethylene ether EO-7 is 2-3%, the content of fatty alcohol polyoxyethylene ether EO-3 is 0.5-1%, the content of polyglycerol fatty acid ester is 0.1-1%, the content of fatty acid methyl ester ethoxylate is 0.3-3%, and the content of alkyl glucoside is 0.1-1%.

[0028] Preferably, the fluorescent brightener includes one or more of bistriazine aminostilbene brightener (VBL), distyryl biphenyl brightener (CBS-X).

[0029] Preferably, the fluorescent brightener is a bistriazine aminostilbene type brightener or a distyryl biphenyl type brightener. The content of the bistriazine aminostilbene type brightener is 1-5%, and the content of the distyryl biphenyl type brightener is 10-20%.

[0030] Preferably, the auxiliary agent includes at least one or more of polyol and sodium carboxymethyl cellulose.

[0031] Preferably, the polyol includes one or more of polysiloxane alcohol, glycerol, propylene glycol, pentylene glycol, butylene glycol, hexylene glycol, and sorbitol.

[0032] Preferably, the polyol is polysiloxane alcohol, glycerol, and sorbitol. The polysiloxane alcohol is 0.1-0.5%, the glycerol is 0.5-2%, and the sorbitol is 0.1-1%.

[0033] In actual research and development, it was found that if a large amount of fluorescent whitening agent was added without adding auxiliary agents, the laundry tablets produced would become brittle and easy to break when the humidity was low, resulting in poor storage stability.

[0034] By adopting the above technical solution, the auxiliary agent is further preferably a polyol, and the water-retaining and water-locking properties of the polyol hydroxyl group are utilized to improve the storage stability of the whitening laundry tablet.

[0035] Preferably, the enzyme preparation comprises at least two of protease, amylase, lipase, cellulase, pectinase, mannanase and phosphodiesterase.

[0036] Preferably, the enzyme preparation is protease, amylase, lipase, wherein the protease is 1-3%, the amylase is 0.1-3%, and the lipase is 0.5-1.5%.

[0037] Preferably, the plant extracts include at least soapberry extract, tea tree oil extract, and camellia oleifera extract.

[0038] Preferably, the soapberry extract, tea tree oil extract and camellia oleifera extract are mixed in a ratio of (0.2-0.4): (0.1-0.3): (0.1-0.2).

[0039] By adopting the above technical solution and selecting specific plant extracts for combination, it can not only achieve a good antiseptic effect and avoid the use of chemical preservatives, but also add plant fragrance to the laundry tablets.

[0040] Preferably, the antifouling agent is one or both of a hydrophobically modified acrylic polymer and a water-soluble nonionic polyester.

[0041] Preferably, the molecular weight of the hydrophobically modified acrylic polymer is 30,000-50,000, and the Brookfield viscosity is 0-500 cPs.

[0042] The combination of hydrophobically modified acrylic polymer can promote the shedding of sebum and grease on fabrics, and has a synergistic effect on whitening fabrics during use.

[0043] Water-soluble nonionic polyester prevents stains from penetrating deep into the fabric, protecting the fabric and providing excellent resistance to redeposition of soil in the second wash.

[0044] The above-mentioned preferred antifouling agent can not only improve the detergency of sebum dirt, but also provide excellent whiteness maintenance performance, maintain the stability of the formula and improve the viscosity of the formula.

[0045] Preferably, the hydrophobically modified acrylic polymer is 1-3%, and the water-soluble nonionic polyester is 0.5-2%.

[0046] In a second aspect, the present application provides a method for preparing a whitening and decontamination laundry tablet, using the following technical solution:

[0047] A method for preparing a whitening and decontamination laundry tablet comprises the following steps:

[0048] Step 1: Mix water and film-forming agent at 85-90°C until uniform;

[0049] Step 2: Add chelating agent and mix until uniform;

[0050] Step 3: Add anionic surfactant, nonionic surfactant and antifouling agent and mix until uniform;

[0051] Step 4: Add fluorescent brightener at 50-60°C and mix until uniform;

[0052] Step 5: Add plant extract and mix until smooth;

[0053] Step 6: drying and forming the tablets to obtain semi-finished laundry tablets;

[0054] Step 7: Spray the enzyme solution onto the semi-finished laundry tablets to obtain whitening and decontamination laundry tablets.

[0055] Fluorescent whitening agents are easy to combine with enzyme preparations through electrostatic forces, causing changes in the conformation of the enzyme, thus affecting the decontamination effect. The present application not only selects specific film-forming agents, anionic surfactants, and nonionic surfactants to enhance the decontamination and whitening effects, but also adds enzyme preparations by spraying, further avoiding direct combination of fluorescent whitening agents with enzyme preparations, and not affecting the decontamination activity of the enzyme preparations.

[0056] In summary, this application has the following beneficial effects:

[0057] 1. This application selects a specific type of film-forming agent to cooperate with the fluorescent whitening agent to form a water-soluble polymer complex, which reduces the photodegradation and photoisomerization of the fluorescent whitening agent during processing and storage. In addition, due to the good water solubility of the laundry tablet, it can be quickly dissolved and dispersed in water, reducing the risk of uneven whitening and color spots caused by direct contact of the fluorescent whitening agent with the fabric.

[0058] 2. With the cooperation of specific film-forming agents, anionic surfactants and nonionic surfactants, the prepared laundry tablets can be added with a large amount of fluorescent whitening agent and have good moisture resistance. During use, the decontamination effect of anionic surfactants and nonionic surfactants can be exerted as much as possible, thereby achieving efficient whitening and decontamination effects.

[0059] 3. The method of the present application adds the enzyme preparation by spraying, thereby further avoiding direct combination of the fluorescent whitening agent with the enzyme preparation and not affecting the decontamination activity of the enzyme preparation.

[0060] 4. The whitening laundry tablets prepared in the present application wrap the fluorescent whitening agent inside the laundry tablets, which can prevent the fluorescent whitening agent from falling off and migrating during the use of the product, so that the whitening effect can be exerted for a long time.

[0061] 5. The present application uses specific plant extracts for formulation, which can not only play a good antiseptic effect and avoid the use of chemical preservatives, but also add plant fragrance to the laundry tablets. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 This is the test result diagram of Test 1 of the present application. The test sample usage is 2 g, and the test samples include the whitening and decontamination laundry tablets of Example 3, commercially available non-woven whitening tablet A, commercially available non-woven whitening tablet B, and commercially available non-woven whitening tablet C.

[0063] Figure 2This is the test result diagram of Test 1 of the present application. The test sample usage is 4g, and the test samples include the whitening and decontamination laundry tablets of Example 3, commercially available non-woven whitening tablet A, commercially available non-woven whitening tablet B, and commercially available non-woven whitening tablet C.

[0064] Figure 3 This is the test result diagram of Test 1 of the present application. The test sample usage is 2 g, and the test samples include the whitening and decontamination laundry tablets of Example 3, commercially available whitening laundry detergent A, and commercially available whitening laundry detergent B. DETAILED DESCRIPTION

[0065] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0066] The raw materials used in the following examples and comparative examples are all commercially available products.

[0067] The following is a description of the sources of some raw materials:

[0068] Polyvinyl alcohol can be selected from Changchun Chemical (Jiangsu) Co., Ltd. with item number BP-05 or BP-17

[0069] Polyvinyl pyrrolidone can be selected from K30\60\90.

[0070] The polysiloxanols can be selected from the water-soluble series of Wacker Chemicals.

[0071] The modified polyvinyl alcohol may be carboxylated polyvinyl alcohol and / or sulfonated polyvinyl alcohol, and may be selected from KL-318 of Guangzhou Qihua Chemical Co., Ltd.

[0072] The polyglycerol fatty acid ester can be selected from Shandong Binzhou Jinsheng New Materials Technology Co., Ltd.

[0073] The water-soluble nonionic polyester can be selected from Dow Chemical Technology Co., Ltd. SRN 100.

[0074] The hydrophobically modified acrylic polymer has a molecular weight of 30,000-50,000 and a Brookfield viscosity of 0-500 cPs, and can be selected from ACUSOL 845 of The Dow Chemical Technology LLC of the United States.

[0075] Example

[0076] Examples 1-6

[0077] A whitening and decontamination laundry tablet is prepared by drying a slurry, wherein the slurry comprises raw materials as shown in Table 1.

[0078] The present application also provides a method for preparing a whitening and decontamination laundry tablet, comprising the following steps:

[0079] Step 1: Mix the film-forming agent with an appropriate amount of deionized water, raise the temperature to 88°C, and stir at a constant temperature until the material swells and dissolves into a homogeneous phase.

[0080] Step 2: Dissolve the chelating agent in deionized water at a mass ratio of 1:1, then add it to the material in step 1 and mix evenly.

[0081] Step 3: The antifouling agent is pre-mixed with an appropriate amount of deionized water, and then added into the material of step 2 together with anionic surfactant and nonionic surfactant and mixed until uniform.

[0082] Step 4: Use appropriate amount of deionized water to dissolve the fluorescent brightener.

[0083] Cool the material in step 3 to 55°C, then quickly add the fluorescent brightener to the material in step 3 and stir until it is fully dissolved.

[0084] Step 5: Add the plant extract and the remaining deionized water to the material in step 4, and stir evenly to obtain a slurry.

[0085] Step 6: Dry the slurry, shape it into tablets, and obtain semi-finished laundry tablets.

[0086] Step 7: Spray the enzyme preparation (liquid) onto the semi-finished laundry tablets to obtain whitening and decontamination laundry tablets.

[0087] Unless otherwise specified, an appropriate amount of deionized water may be used according to actual conditions. This is only used to ensure uniform dissolution and there are no strict requirements.

[0088] Table 1

[0089]

[0090]

[0091] Comparative Example

[0092] Comparative Example 1

[0093] A whitening and decontamination laundry tablet, which is different from Example 3 in that the film-forming agent is replaced by corn starch.

[0094] Comparative Example 2

[0095] A whitening and decontamination laundry detergent, which is different from Example 3 in that the film-forming agent is replaced by water.

[0096] A method for preparing a whitening and decontamination laundry detergent, which is different from that of Example 3 in that it comprises the following steps:

[0097] Step 1: Dissolve the chelating agent in deionized water at a mass ratio of 1:1 and mix well.

[0098] Step 2: The antifouling agent is mixed with an appropriate amount of deionized water in advance, and then added to the material in step 1 together with the anionic surfactant and the nonionic surfactant and mixed until uniform. The mixing temperature is set at 88°C. Step 3: Use an appropriate amount of deionized water to dissolve the fluorescent whitening agent.

[0099] Cool the material in step 2 to 55°C, then quickly add the fluorescent brightener to the material in step 2 and stir until it is fully dissolved.

[0100] Step 4: Add the plant extract and the remaining deionized water to the material in step 3, and stir evenly to obtain a slurry.

[0101] Step 5: Add the enzyme preparation into the slurry to obtain a whitening and decontamination laundry detergent.

[0102] Comparative Example 3

[0103] A whitening and decontamination laundry detergent comprises 8kg of triethanolamine sulfate of fatty alcohol polyoxyethylene ether, 10kg of sodium dodecyl sulfate, 5kg of sodium lauroyl isethionate, 18kg of fluorescent whitening agent (CBS-X), 4kg of C12-18 alkyl glucoside, 11kg of ammonium coconut monoglyceride sulfate, 8kg of sodium rosin alcohol polyoxyethylene ether succinic acid monoester sulfonate and 36kg of water.

[0104] The whitening and decontamination laundry detergent is obtained by mixing various raw materials until they are uniform.

[0105] After the whitening and decontamination laundry detergent has been left standing for 1 hour, a precipitate will form.

[0106] Comparative Example 4

[0107] A whitening and decontamination laundry tablet, which is different from Example 3 in that anionic surfactant is omitted and fatty alcohol polyoxyethylene ether EO-7 is used to supplement the amount of the original anionic surfactant.

[0108] Comparative Example 5

[0109] A whitening and decontamination laundry tablet is different from Example 3 in that the nonionic surfactant is omitted and sodium lauryl sulfate is used to supplement the original nonionic surfactant.

[0110] Comparative Example 6

[0111] A whitening and decontamination laundry tablet, which is different from Example 3 in that sodium dodecyl sulfate is replaced by sodium dodecylbenzene sulfonate, sodium α-olefin sulfonate is replaced by sodium lauroyl isethionate, and sodium fatty acid methyl ester sulfonate is replaced by sodium fatty alcohol polyoxyethylene ether sulfate.

[0112] Comparative Example 7

[0113] A whitening and decontamination laundry tablet, which is different from Example 3 in that: alkyl glucoside is replaced by dodecyl-β-D-maltoside, polyglycerol fatty acid ester and fatty acid methyl ester ethoxylate are replaced by polyoxyethylene amide, and fatty alcohol polyoxyethylene ether EO-7 and fatty alcohol polyoxyethylene ether EO-3 are replaced by Tween 80.

[0114] Comparative Example 8

[0115] A whitening and decontamination laundry tablet, which is different from Example 3 in that the auxiliary agent is replaced by water.

[0116] The whitening and decontamination laundry tablet of Comparative Example 8 was stored at low humidity (20-40%) for 24-48 hours, and cracking occurred, and part of it broke into uneven fragments.

[0117] The whitening and decontamination-removing laundry tablets of Examples 1-6 were stored at low humidity (20-40%) for 24-48 hours without any cracking.

[0118] Moisture resistance stability test:

[0119] Two whitening and decontamination laundry tablets are stacked up and placed in a test environment at a temperature of (25±2)°C and a humidity of (85±5)% for 24 hours. The two detergent tablets are then separated and observed to see if there is any adhesion between the tablets. The adhesion phenomenon is divided into no adhesion, slight adhesion and obvious adhesion.

[0120] The whitening and stain-removing laundry tablet of Comparative Example 8 exhibited obvious sticking, while the whitening and stain-removing laundry tablets of Examples 1-6 were all free of sticking.

[0121] Comparative Example 9

[0122] A method for preparing a whitening and decontamination laundry tablet, which is different from that of Example 3 in that it comprises the following steps:

[0123] Step 1: Mix the film-forming agent with an appropriate amount of deionized water, raise the temperature to 88°C, and stir at a constant temperature until the material swells and dissolves into a homogeneous phase.

[0124] Step 2: Dissolve the chelating agent in deionized water at a mass ratio of 1:1, then add it to the material in step 1 and mix evenly.

[0125] Step 3: The antifouling agent is pre-mixed with an appropriate amount of deionized water, and then added into the material of step 2 together with anionic surfactant and nonionic surfactant and mixed until uniform.

[0126] Step 4: Use appropriate amount of deionized water to dissolve the fluorescent brightener.

[0127] Cool the material in step 3 to 55°C, then quickly add the fluorescent brightener to the material in step 3 and stir until it is fully dissolved.

[0128] Step 5: Add the plant extract and the remaining deionized water to the material in step 4, and stir evenly to obtain a slurry.

[0129] Step 6: Add the enzyme preparation to the material in step 5 and mix well.

[0130] Step 7: Dry the slurry, shape it into tablets, and obtain whitening and decontamination laundry tablets.

[0131] Performance testing

[0132] Test 1: Whitening

[0133] 1. Whitening effect

[0134] The pure cotton white cloth was photographed under natural light; the pure cotton white cloth was photographed under fluorescent light (model: ZF-7 standard) for comparison.

[0135] Put a piece of pure cotton white cloth and the test sample (2g, 4g) into the washing machine and wash it normally with tap water (washing, rinsing, and dehydration); the water temperature is 25±1℃; take out the pure cotton white cloth after the whole washing process is completed.

[0136] Drying in a drying oven (model: KH-55A), 120℃, 25min. The pure cotton white cloth washed with whitening and decontamination laundry tablets was photographed under a fluorescent lamp (model: ZF-7 standard) for comparison.

[0137] The test samples are the whitening and decontamination laundry tablets of Example 3, commercially available non-woven whitening tablet A, commercially available non-woven whitening tablet B, commercially available non-woven whitening tablet C, commercially available whitening laundry liquid A, and commercially available whitening laundry liquid B.

[0138] The test results are detailed in Figure 1-3 , Figure 1 , 3 All of them are test groups with a sample usage of 2g. Figure 2 All of them are test groups with a sample usage of 4g.

[0139] according to Figure 1 , 2 The test results show that the whitening and decontamination laundry tablet of Example 3 has a good whitening effect on pure cotton white cloth. However, the whitening effect of the commercially available non-woven whitening tablets A\B\C on pure cotton white cloth is not as good as that of Example 3.

[0140] according to Figure 3 The test results show that when the pure cotton white cloth is treated with the commercially available whitening laundry detergent A\B, it can be clearly seen that the fluorescent whitening agent is unevenly adsorbed and distributed on the cotton cloth under the fluorescent light. However, when the pure cotton white cloth is washed with the whitening and decontamination laundry tablet of Example 3, the fluorescent whitening agent is evenly distributed.

[0141] 2. Whitening value:

[0142] Use a digital fluorescent whiteness meter (model: WSB-3C) to measure the whiteness value of pure cotton white cloth, which is the initial whiteness value.

[0143] Put a piece of pure cotton white cloth and the test sample (2g, 4g) into the washing machine and wash it normally with tap water (washing, rinsing, and dehydration); the water temperature is 25±1℃; take out the pure cotton white cloth after the whole washing process is completed.

[0144] Drying in a drying oven (model: KH-55A), 120℃, 25min; using a digital fluorescent whiteness meter (model: WSB-3C) to measure the whiteness value of the washed pure cotton white cloth.

[0145] The whitening value was calculated according to the following calculation method and recorded in Table 2.

[0146] Calculation method of whitening value: take five data, exclude the maximum and minimum values, and take the average of the three middle values.

[0147] The test samples are respectively the whitening and decontamination laundry tablets of Examples 1-5, Comparative Examples 1 and 4-9, the whitening and decontamination laundry liquids of Comparative Examples 2-3, commercially available non-woven whitening tablet A, commercially available non-woven whitening tablet B, commercially available non-woven whitening tablet C, commercially available whitening laundry liquid A, and commercially available whitening laundry liquid B.

[0148] Table 2

[0149]

[0150]

[0151] Test 2: Decontamination

[0152] The test is carried out according to GB / T 13174-2021 "Determination of the detergency and washing cycle performance of detergents for clothing".

[0153] The test pieces are JB-01 dirty cloth, JB-02 dirty cloth, and JB-03 dirty cloth. The test pieces and 2g of the test sample are put into the washing machine together and washed normally with tap water (washing, rinsing, and dehydration); the water temperature is 25±1℃; after the whole washing process is completed, take out and dry in a drying oven (model: KH-55A), 120℃, 25min.

[0154] Calculate the decontamination ratio Pi of the test piece after cleaning and record it in Table 3.

[0155] Among them, when Pi ≥ 1.0, it is qualified, and Pi < 1.0, it is unqualified.

[0156] The test samples are respectively the whitening and decontamination laundry tablets of Examples 1-5, Comparative Examples 1 and 4-9, the whitening and decontamination laundry liquids of Comparative Examples 2-3, the commercially available non-woven whitening tablet A, and the commercially available whitening laundry liquid A.

[0157] Table 3

[0158]

[0159]

[0160] According to the test data in Tables 2 and 3, the whitening and decontamination laundry tablets of Examples 1-5 have better whitening and decontamination effects on pure cotton sheets than commercially available products.

[0161] In Comparative Example 1, corn starch is used to replace the film-forming agent. Although corn starch is also a polyhydroxy compound, it cannot form a special combination with the special raw materials in the system, thus affecting the film-forming effect.

[0162] Comparative Example 2 is based on Example 3, but the film-forming agent is omitted, and the product is made into a liquid. Due to the lack of a special combination of a specific film-forming agent and other raw materials, the whitening and decontamination effects of Comparative Example 2 have a relatively obvious downward trend.

[0163] Comparative Example 3 is a whitening and decontamination laundry detergent, which simulates a mixed product of a common surfactant and a fluorescent whitening agent on the market. After standing for 1 hour, the product of Comparative Example 3 precipitated and had unstable performance. As can be seen from Tables 2 and 3, its whitening and decontamination effects are not good.

[0164] In Comparative Examples 4 and 5, the specific anionic surfactant and nonionic surfactant were omitted respectively, and the obtained products could not be formed into sheets.

[0165] In Comparative Examples 6 and 7, specific anionic surfactants and nonionic surfactants are replaced with other corresponding common surfactants, respectively, which destroys the special coordination effect between the specific surfactant and the film-forming agent and fluorescent whitening agent, thereby significantly reducing the whitening and decontamination effects.

[0166] Comparative Example 8 omits the auxiliary agent based on Example 3. Although the performance of whitening and decontamination is not significantly reduced, its moisture resistance stability is poor and improper storage can easily lead to performance failure.

[0167] Comparative Example 9 is based on Example 3, and the enzyme preparation is directly mixed with other raw materials, so that the performance of the enzyme preparation cannot be fully exerted, especially the decontamination performance is greatly affected.

[0168] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A whitening and decontamination laundry tablet, characterized in that: In terms of mass percentage, it includes the following raw materials: 10-30% film former, 10-30% anionic surfactant, 3-10% nonionic surfactant, 11-30% fluorescent brightener, 0.5-5% antifouling agent, 0.5-5% enzyme preparation, 0.1-1% plant extract, 0.5%-5% chelating agent, 0.5-5% auxiliary agent; The film-forming agent at least includes a film-forming agent A and a film-forming agent B; the film-forming agent A is polyvinyl alcohol, and the film-forming agent B includes one or more of polyvinyl pyrrolidone and modified polyvinyl alcohol; The anionic surfactant includes at least sodium alkyl sulfate, sodium fatty acid methyl ester sulfonate, and sodium α-olefin sulfonate; The nonionic surfactant includes one or more of polyglycerol fatty acid esters, fatty alcohol polyoxyethylene ethers, isomeric alcohol polyoxyethylene ethers, secondary alcohol polyoxyethylene ethers, fatty acid methyl ester ethoxylates, alcohol ether glycosides, and alkyl glucosides.

2. The whitening and decontamination laundry tablet according to claim 1, characterized in that: The film-forming agents are film-forming agent A and film-forming agent B; film-forming agent A is polyvinyl alcohol, and film-forming agent B is polyvinyl pyrrolidone or modified polyvinyl alcohol; The anionic surfactants are sodium alkyl sulfate, sodium fatty acid methyl ester sulfonate, sodium α-olefin sulfonate; The nonionic surfactants are polyglycerol fatty acid esters, fatty alcohol polyoxyethylene ethers, fatty acid methyl ester ethoxylates, and alkyl glucosides.

3. The whitening and decontamination laundry tablet according to claim 1, characterized in that: According to mass percentage, the sodium alkyl sulfate is 8-15%, the sodium fatty acid methyl ester sulfonate is 1-5%, and the sodium α-olefin sulfonate is 1-3%.

4. The whitening and decontamination laundry tablet according to claim 2, characterized in that: The fatty alcohol polyoxyethylene ether includes one or more of fatty alcohol polyoxyethylene ether EO-7 and fatty alcohol polyoxyethylene ether EO-3.

5. The whitening and decontamination laundry tablet according to claim 4, characterized in that: According to the mass percentage, the fatty alcohol polyoxyethylene ether EO-7 is 2-3%, the fatty alcohol polyoxyethylene ether EO-3 is 0.5-1%, the polyglycerol fatty acid ester is 0.1-1%, the fatty acid methyl ester ethoxylate is 0.3-3%, and the alkyl glucoside is 0.1-1%.

6. The whitening and decontamination laundry tablet according to claim 1, characterized in that: The fluorescent brightener includes one or more of a bistriazine aminostilbene brightener and a distyryl biphenyl brightener; preferably, in terms of mass percentage, the bistriazine aminostilbene brightener is 1-5%, and the distyryl biphenyl brightener is 10-20%.

7. The whitening and decontamination laundry tablet according to claim 1, characterized in that: The auxiliary agent at least includes one or more of polyol and sodium carboxymethyl cellulose.

8. The whitening and decontamination laundry tablet according to claim 7, characterized in that: The polyol includes one or more of polysiloxane alcohol, glycerol, propylene glycol, pentylene glycol, butylene glycol, hexylene glycol, and sorbitol.

9. The whitening and decontamination laundry tablet according to claim 8, characterized in that: According to mass percentage, the polysiloxane alcohol is 0.1-0.5%, the glycerol is 0.5-2%, and the sorbitol is 0.1-1%.

10. The whitening and decontamination laundry tablet according to claim 1, characterized in that: The enzyme preparation comprises at least two of protease, amylase, lipase, cellulase, pectinase, mannanase and phosphodiesterase.

11. The whitening and decontamination laundry tablet according to claim 1, characterized in that: The plant extracts at least include soapberry extract, tea tree oil extract, and camellia oleifera extract; preferably, the soapberry extract, tea tree oil extract, and camellia oleifera extract are mixed in a ratio of (0.2-0.4): (0.1-0.3): (0.1-0.2).

12. The whitening and decontamination laundry tablet according to claim 1, characterized in that: The antifouling agent is one or both of hydrophobically modified acrylic polymer and water-soluble nonionic polyester.

13. The whitening and decontamination laundry tablet according to claim 12, characterized in that: The molecular weight of the hydrophobically modified acrylic polymer is 30,000-50,000, and the Brookfield viscosity is 0-500 cPs.

14. The whitening and decontamination laundry tablet according to claim 12, characterized in that: According to mass percentage, the hydrophobically modified acrylic polymer is 1-3%, and the water-soluble nonionic polyester is 0.5-2%.

15. A method for preparing the whitening and decontamination laundry tablet according to any one of claims 1 to 14, characterized in that: The following steps are involved: Step 1: Mix water and film former at 85-90℃ until uniform; Step 2: Add chelating agent and mix until uniform; Step 3: Add anionic surfactant, nonionic surfactant and antifouling agent and mix until uniform; Step 4: Add fluorescent brightener at 50-60°C and mix until uniform; Step 5: Add plant extract and mix until smooth; Step 6: drying and forming the tablets to obtain semi-finished laundry tablets; Step 7: Spray the enzyme preparation onto the semi-finished laundry tablets to obtain whitening and stain-removing laundry tablets.

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