Brightening and stain-removing laundry sheet and preparation method therefor

Abstract

A brightening and stain-removing laundry sheet and a preparation method therefor. The laundry sheet comprises: a film-forming agent, an anionic surfactant, a nonionic surfactant, a fluorescent brightening agent, an anti-fouling agent, an enzyme formulation, 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 being polyvinyl alcohol, and the film-forming agent B comprising one or more of polyvinylpyrrolidone and modified polyvinyl alcohol. The anionic surfactant comprises sodium alkyl sulfate, sodium fatty acid methyl ester sulfonate, and sodium α-alkenyl sulfonate; and the nonionic surfactant comprises polyglycerol ester of fatty acid, fatty alcohol-polyoxyethylene ether, fatty acid methyl ester ethoxylate, and alkyl polyglycoside. The laundry sheet has high solubility, achieves a remarkable brightening effect on fabrics while having stain-removing capability, and further possesses the advantages of good portability, convenient use, no solid matter remaining after use, etc.

Description

Whitening and stain-removing laundry tablet and preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the field of washing products, more particularly, it relates to a whitening and stain-removing laundry tablet and preparation method thereof. BACKGROUND

[0002] With the aging of fabric substrates, their color tends to fade or yellow due to exposure to light, air, and natural degradation of fibers. Currently, whitening agents are often used to solve the problem of fabric yellowing. The whitening of fluorescent whitening agents is actually an optical effect that does not damage the fiber structure of clothes or textiles, but fluorescent whitening agents can only make fabrics whiter and cannot improve the cleanliness of fabrics.

[0003] Currently, the content of whitening agents in washing products is usually 0.1%-0.5%, which belongs to trace addition. Therefore, the whitening effect of fabrics during washing is not significant.

[0004] Most of the washing products 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 as high as 30%, but do not have the ability to remove stains and have a short shelf life.

[0006] For example, CN202310421252.0 and CN201610643400.3 provide technical solutions for whitening laundry liquid with washing effect, which have a fluorescent whitening agent content of not more than 10%. Whether it is a whitening agent or a whitening laundry liquid, the amount used is difficult to control in actual use. If the undiluted whitening laundry liquid directly contacts the fabric, it is easy to cause the whitening agent to quickly adsorb onto the fabric, causing uneven whitening and color spots.

[0007] Currently available fabric whitening tablets 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 removing stains and washing. For example, CN201910736357.9 and CN201910713427.9 provide technical solutions for whitening tablets. Although the whitening tablet is 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 easy to be wrapped by the fabric, resulting in local color difference during washing; (3) the fallen fiber is easy to adhere to the fabric, causing secondary processing; (4) after washing, the fiber cloth needs to be manually discarded and processed by the user.

[0008] Based on the above problems, it is urgent to seek a solution.

[0009] SUMMARY

[0010] To solve the above problems, the application provides a whitening and stain-removing laundry tablet and a preparation method thereof. The whitening and stain-removing laundry tablet obtained by the technical solution has strong solubility, good whitening effect on fabrics, stain-removing capacity, portability, convenience of use, applicability to all washing equipment, and no solid residue after use.

[0011] The whitening laundry tablet prepared by the application wraps the fluorescent whitening agent inside the laundry tablet, which can effectively prevent the fluorescent whitening agent from falling off and migrating during the product taking process. The use of chemical preservatives is avoided by adding plant extracts, and the application has a good development prospect.

[0012] In a first aspect, the application provides a whitening and stain-removing laundry tablet, which adopts the following technical solution:

[0013] A whitening and stain-removing laundry tablet is prepared by drying a slurry. The slurry includes the following raw materials in terms of mass percentage:

[0014] 10-30% film-forming agent, 10-30% anionic surfactant, 3-10% nonionic surfactant, 11-30% fluorescent whitening agent, 0.5-5% stain-resistant agent, 0.5-5% enzyme preparation, 0.1-1% plant extract, 0.5%-5% chelating agent, 0.5-5% auxiliary agent, and water;

[0015] The film-forming agent includes at least film-forming agent A and film-forming agent B. The film-forming agent A is polyvinyl alcohol, and the film-forming agent B includes one or more of polyvinylpyrrolidone and modified polyvinyl alcohol.

[0016] The anionic surfactant includes at least sodium alkyl sulfate, sodium fatty acid methyl ester sulfonate, and sodium alpha-olefin sulfonate.

[0017] The nonionic surfactant includes one or more of polyglycerol fatty acid ester, fatty alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, secondary alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate, alcohol ether glycoside, and alkyl glucoside.

[0018] Preferably, the film-forming agent 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%.

[0019] By adopting the above technical scheme, the polyvinyl alcohol, polyvinylpyrrolidone and other multi-hydroxy polymers are used as the film forming agent to form a water-soluble polymer complex with the fluorescent whitening agent through strong hydrogen bond combination. After forming, the film forming agent "covers" the fluorescent whitening agent, and reduces the photodegradation and photoisomerization of the fluorescent whitening agent in the process of processing and storage. Due to the special structure of the water-soluble polymer complex, the laundry tablet has good water solubility, and can be quickly dissolved and dispersed in water when washing, thereby reducing the risk of uneven whitening and color spots caused by direct contact of the fluorescent whitening agent with the fabric.

[0020] The laundry tablet has good water solubility, and can be quickly dissolved and dispersed in water when washing, thereby reducing the risk of uneven whitening and color spots caused by direct contact of the fluorescent whitening agent with the fabric.

[0021] Preferably, the film forming agent A is 10-20%, and the film forming agent B is 1-5%.

[0022] Preferably, the film forming agent is the film forming agent A and the film forming agent B; the film forming agent A is polyvinyl alcohol, and the film forming agent B is polyvinylpyrrolidone or modified polyvinyl alcohol.

[0023] Preferably, the modified polyvinyl alcohol is carboxylated polyvinyl alcohol and / or sulfonated polyvinyl alcohol.

[0024] Preferably, the anionic surfactant is sodium alkyl sulfate, sodium fatty acid methyl ester sulfonate or sodium alpha-alkenyl sulfonate.

[0025] Preferably, the sodium alkyl sulfate is 8-15%, the sodium fatty acid methyl ester sulfonate is 1-5%, and the sodium alpha-alkenyl sulfonate is 1-3%.

[0026] Preferably, the nonionic surfactant is polyglycerol fatty acid ester, fatty alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate or alkyl glucoside.

[0027] Preferably, the fatty alcohol polyoxyethylene ether includes one or more of fatty alcohol polyoxyethylene ether EO-7, fatty alcohol polyoxyethylene ether EO-3.

[0028] Preferably, the fatty alcohol polyoxyethylene ether EO-7 is 2-3%, the fatty alcohol polyoxyethylene ether EO-3 is 0.5-1%, the polyglycerin 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%.

[0029] Preferably, the fluorescent whitening agent includes one or more of bis-triazine aminostilbene whitening agent (VBL) and stilbene-based biphenyl whitening agent (CBS-X).

[0030] Preferably, the fluorescent whitening agent is bis-triazine aminostilbene whitening agent and stilbene-based biphenyl whitening agent. The bis-triazine aminostilbene whitening agent is 1-5%, and the stilbene-based biphenyl whitening agent is 10-20%.

[0031] Preferably, the auxiliary agent includes one or more of polyhydric alcohol and sodium carboxymethyl cellulose.

[0032] Preferably, the polyhydric alcohol includes one or more of polysiloxanol, glycerol, propylene glycol, pentylene glycol, butylene glycol, hexylene glycol, and sorbitol.

[0033] Preferably, the polyhydric alcohol is polysiloxanol, glycerol, and sorbitol. The polysiloxanol is 0.1-0.5%, the glycerol is 0.5-2%, and the sorbitol is 0.1-1%.

[0034] In actual research and development, it is found that if the fluorescent whitening agent is added in a large amount without an auxiliary agent, the laundry tablet prepared has a brittle texture and is easy to break when the humidity is low, resulting in poor storage stability.

[0035] By using the above technical solution, the auxiliary agent is further optimized to be polyhydric alcohol, and the storage stability of the whitening laundry tablet is improved by using the water retention and locking characteristics of the hydroxyl group of the polyhydric alcohol.

[0036] Preferably, the enzyme preparation includes at least two of protease, amylase, lipase, cellulase, pectinase, mannanase, and phosphodiesterase.

[0037] Preferably, the enzyme preparation is protease, amylase, and lipase. The protease is 1-3%, the amylase is 0.1-3%, and the lipase is 0.5-1.5%.

[0038] Preferably, the plant extract includes at least Chinese soapberry extract, tea tree oil extract, and oil tea dregs extract.

[0039] Preferably, the soapberry extract, tea tree oil extract, and oil tea dregs extract are mixed in a ratio of (0.2-0.4):(0.1-0.3):(0.1-0.2).

[0040] By using the above technical solution, the specific plant extract is selected for compounding, which can not only achieve good preservation effect and avoid the use of chemical preservatives, but also add plant aroma to the laundry tablet.

[0041] Preferably, the soil release agent is one or both of a hydrophobically modified acrylic polymer and a water-soluble nonionic polyester.

[0042] Preferably, the hydrophobically modified acrylic polymer has a molecular weight of 30,000-50,000 and a Brookfield viscosity of 0-500 cPs.

[0043] The compounding of the hydrophobically modified acrylic polymer can promote the shedding of fabric sebum and oil, and has a synergistic effect on whitening fabrics in use.

[0044] The water-soluble nonionic polyester can prevent stains from penetrating the fabric and provide protection to the fabric, and provide excellent anti-redeposition effect in the second cleaning.

[0045] The above preferred soil release agent can not only improve the soil removal of sebum stains, but also provide excellent whiteness retention performance, and maintain formula stability and improve formula viscosity.

[0046] Preferably, the hydrophobically modified acrylic polymer is 1-3%, and the water-soluble nonionic polyester is 0.5-2%.

[0047] In a second aspect, the application provides a preparation method of a whitening and soil removal laundry tablet, which adopts the following technical solution:

[0048] A preparation method of a whitening and soil removal laundry tablet, comprising the following steps:

[0049] Step 1: mix water and film-forming agent at 85-90°C until uniform;

[0050] Step 2: add the chelating agent and mix until uniform;

[0051] Step 3: add the anionic surfactant, nonionic surfactant, and soil release agent and mix until uniform;

[0052] Step 4: add the fluorescent whitening agent at 50-60°C and mix until uniform;

[0053] Step 5: add the plant extract and mix until uniform;

[0054] Step 6: dry and shape the tablet to obtain a semi-finished laundry tablet;

[0055] Step 7: Spraying the enzyme preparation solution to the semi-finished laundry tablet to obtain the whitening and stain removal laundry tablet.

[0056] The fluorescent whitening agent is easy to combine with the enzyme preparation through electrostatic interaction to cause conformational change of the enzyme, affecting the stain removal effect. The present application not only enhances the stain removal effect and whitening effect by selecting specific film-forming agents, anionic surfactants and nonionic surfactants together, but also further avoids the direct combination of the fluorescent whitening agent with the enzyme preparation by spraying the enzyme preparation, so as to avoid affecting the stain removal activity of the enzyme preparation.

[0057] In summary, the present application has the following beneficial effects:

[0058] 1. The present application selects specific types of film-forming agents 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. Moreover, due to the good water solubility of the laundry tablet, it can quickly dissolve and disperse in water, reducing the risk of uneven whitening and color spots caused by direct contact of the fluorescent whitening agent with fabrics.

[0059] 2. Under the cooperation of specific film-forming agents, anionic surfactants and nonionic surfactants, the prepared laundry tablet can add a large amount of fluorescent whitening agent, and has good moisture resistance, so as to maximize the stain removal effect of the anionic surfactants and nonionic surfactants during use, thereby realizing the functions of efficient whitening and stain removal.

[0060] 3. The method of the present application adds enzyme preparation by spraying, further avoiding the direct combination of the fluorescent whitening agent with the enzyme preparation, so as to avoid affecting the stain removal activity of the enzyme preparation.

[0061] 4. The whitening laundry tablet prepared by the present application wraps the fluorescent whitening agent inside the laundry tablet, which can avoid the shedding and migration of the fluorescent whitening agent during product use, so as to make the whitening effect long-acting.

[0062] 5. The present application selects specific plant extracts for cooperation, which not only has good preservative effect and avoids the use of chemical preservatives, but also adds plant aroma to the laundry tablet. BRIEF DESCRIPTION OF DRAWINGS

[0063] Figure 1 is a detection result graph of the present application test one, the detection sample usage is 2g, and the detection sample includes the whitening and stain removal laundry tablet of example 3, commercially available non-woven fabric whitening tablet A, commercially available non-woven fabric whitening tablet B and commercially available non-woven fabric whitening tablet C.

[0064] Figure 2 is a detection result graph of the present application test one, the detection sample usage is 4g, and the detection sample includes the whitening and stain removal laundry tablet of example 3, commercially available non-woven fabric whitening tablet A, commercially available non-woven fabric whitening tablet B and commercially available non-woven fabric whitening tablet C.

[0065] Figure 3 is a detection result chart of the test 1 of the present application, the detection sample uses 2g, and the detection sample includes the whitening detergent tablet of example 3, the commercially available whitening laundry liquid A, and the commercially available whitening laundry liquid B. DETAILED DESCRIPTION

[0066] The present application is further described in detail below in combination with the drawings and examples.

[0067] The raw materials used in the following examples and comparative examples are all commercially available products.

[0068] The following is the source description of some raw materials:

[0069] The polyvinyl alcohol can be selected from Changchun Chemical (Jiangsu) Co., Ltd. with product number BP-05 or BP-17.

[0070] The polyvinylpyrrolidone can be selected from K30\60\90.

[0071] The polysiloxanol can be selected from the water-soluble series of Wacker Chemical.

[0072] The modified polyvinyl alcohol can be carboxylated polyvinyl alcohol and / or sulfonated polyvinyl alcohol, which can be selected from KL-318 of Guangzhou Qihua Chemical Co., Ltd.

[0073] The polyglycerol fatty acid ester can be selected from Shandong Binzhou Jinsheng New Material Technology Co., Ltd.

[0074] The water-soluble non-ionic polyester can be selected from Dow Chemical Technology Co., Ltd. SRN 100.

[0075] The hydrophobically modified acrylic polymer has a molecular weight of 30000-50000 and a Brookfield viscosity of 0-500 cPs, which can be selected from ACUSOL 845 of Dow Chemical Technology Co., Ltd.

[0076] EXAMPLE

[0077] Examples 1-6

[0078] A whitening detergent tablet is prepared by drying the slurry, and the slurry includes raw materials as shown in Table 1.

[0079] The present application also provides a preparation method of a whitening detergent tablet, which includes the following steps:

[0080] Step 1: Mix the film-forming agent with a proper amount of deionized water, heat to 88℃, and constant temperature stirring until the material body swells and dissolves to homogeneous phase.

[0081] Step 2: Dissolve and mix the chelating agent with deionized water at a mass ratio of 1:1, then add it to the material of step 1, and mix uniformly.

[0082] Step 3: The soil-resistant agent is mixed with an appropriate amount of deionized water in advance, and then mixed with the anionic surfactant and nonionic surfactant in the material of Step 2 until uniform.

[0083] Step 4: Dissolve the fluorescent whitening agent using an appropriate amount of deionized water.

[0084] Cool the material of Step 3 to 55°C, then quickly add the fluorescent whitening agent to the material of Step 3 and stir until fully dissolved and uniform.

[0085] Step 5: Add the plant extract and the remaining deionized water to the material of Step 4 and stir until uniform to obtain a slurry.

[0086] Step 6: Dry the slurry and shape it into a semi-finished laundry tablet.

[0087] Step 7: Spray the enzyme preparation (liquid) onto the semi-finished laundry tablet to obtain a whitening and soil-removing laundry tablet.

[0088] If not specified, an appropriate amount of deionized water can be used according to the actual situation for uniform dissolution, which is not strictly required.

[0089] Table 1

[0090] Comparative Example

[0091] Comparative Example 1

[0092] A whitening and soil-removing laundry tablet, which differs from Example 3 in that the film-forming agent is replaced by corn starch.

[0093] Comparative Example 2

[0094] A whitening and soil-removing laundry liquid, which differs from Example 3 in that the film-forming agent is replaced by water.

[0095] A method for preparing a whitening and soil-removing laundry liquid, which differs from Example 3 in that it includes the following steps:

[0096] Step 1: Dissolve and mix the chelating agent with deionized water at a mass ratio of 1:1 until uniform.

[0097] Step 2: The soil-resistant agent is mixed with an appropriate amount of deionized water in advance, and then mixed with the anionic surfactant and nonionic surfactant in the material of Step 1 until uniform. The mixing temperature is set at 88°C.

[0098] Cool down the material of step 2 to 55℃, then quickly add the fluorescent whitening agent into the material of step 2, and stir until it is fully dissolved and uniform.

[0099] Step 4: Add the plant extract and the remaining deionized water into the material of step 3, and stir until it is uniform to obtain a slurry.

[0100] Step 5: Add the enzyme preparation into the slurry to obtain the whitening detergent laundry liquid.

[0101] Comparative Example 3

[0102] A whitening detergent laundry liquid, comprising fatty alcohol polyoxyethylene ether triethanolamine sulfate 8 kg, sodium dodecyl sulfate 10 kg, sodium lauryl hydroxyethyl sulfonate 5 kg, fluorescent whitening agent (CBS-X) 18 kg, C12-18 alkyl glucoside 4 kg, ammonium cocoyl monoglyceride sulfate 11 kg, sodium rosin alcohol polyoxyethylene ether succinate monoester sulfonate 8 kg, and water 36 kg.

[0103] Mix the various raw materials until they are uniform to obtain the whitening detergent laundry liquid.

[0104] The whitening detergent laundry liquid has precipitates after standing for 1 h.

[0105] Comparative Example 4

[0106] A whitening detergent laundry tablet, which differs from Example 3 in that the anionic surfactant is omitted, and fatty alcohol polyoxyethylene ether EO-7 is used to supplement the original amount of anionic surfactant.

[0107] Comparative Example 5

[0108] A whitening detergent laundry tablet, which differs from Example 3 in that the nonionic surfactant is omitted, and sodium dodecyl sulfate is used to supplement the original amount of nonionic surfactant.

[0109] Comparative Example 6

[0110] A whitening detergent laundry tablet, which differs from Example 3 in that sodium dodecyl sulfate is replaced by sodium dodecyl benzene sulfonate, α-alkenyl sulfonate sodium is replaced by sodium lauryl hydroxyethyl sulfonate, and fatty acid methyl ester sulfonate sodium is replaced by fatty alcohol polyoxyethylene ether sodium sulfate.

[0111] Comparative Example 7

[0112] A whitening detergent laundry tablet, which differs from Example 3 in that alkyl glucoside is replaced by dodecyl-β-D-maltoside, polyglyceryl 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.

[0113] Comparative Example 8

[0114] A whitening and stain removal laundry tablet, which differs from Example 3 in that the builder is replaced with water.

[0115] The whitening and stain removal laundry tablet of Comparative Example 8 showed cracking and some pieces broke into uneven pieces when stored at low humidity (20-40%) for 24-48h.

[0116] The whitening and stain removal laundry tablets of Examples 1-6 showed no cracking when stored at low humidity (20-40%) for 24-48h.

[0117] Moisture resistance stability test:

[0118] Two pieces of whitening and stain removal laundry tablets were stacked on top of each other and placed in a test environment with a temperature of (25±2) °C and a humidity of (85±5)%, and kept for 24h. Then the two pieces of laundry tablets were separated, and whether there was adhesion between the pieces was observed. The adhesion was classified as no adhesion, slight adhesion, and obvious adhesion.

[0119] The whitening and stain removal laundry tablets of Comparative Example 8 showed obvious adhesion, while the whitening and stain removal laundry tablets of Examples 1-6 showed no adhesion.

[0120] Comparative Example 9

[0121] A method for preparing a whitening and stain removal laundry tablet, which differs from Example 3 in that it comprises the following steps:

[0122] Step 1: Mix the film-forming agent with an appropriate amount of deionized water, heat to 88°C, and stir at constant temperature until the material swells and dissolves into a homogeneous phase.

[0123] Step 2: Dissolve and mix the chelating agent with deionized water at a mass ratio of 1:1, then add it to the material of Step 1 and mix evenly.

[0124] Step 3: Pre-mix the anti-stain agent with an appropriate amount of deionized water, then add it to the material of Step 2 together with the anionic surfactant and non-ionic surfactant, and mix until uniform.

[0125] Step 4: Dissolve the fluorescent whitening agent with an appropriate amount of deionized water.

[0126] Cool the material of Step 3 to 55°C, then quickly add the fluorescent whitening agent to the material of Step 3, and stir until fully dissolved and uniform.

[0127] Step 5: Add the plant extract and the remaining deionized water to the material of Step 4, and stir until uniform to obtain a slurry.

[0128] Step 6: Add the enzyme preparation to the material of Step 5 and mix until uniform.

[0129] Step 7: drying the slurry, shaping and tabletting to obtain the whitening and stain removal laundry tablet.

[0130] Performance test

[0131] Test 1: whitening

[0132] 1. Whitening effect

[0133] The pure cotton white cloth was photographed under natural light; the pure cotton white cloth was photographed under fluorescent light (model: ZF-7 standard).

[0134] A piece of pure cotton white cloth was placed in a washing machine together with the test sample (2g, 4g) and washed normally (washing, rinsing, dehydration) with tap water; the water temperature was 25±1℃; the pure cotton white cloth was taken out after the whole washing process was completed.

[0135] The pure cotton white cloth washed with the whitening and stain removal laundry tablet was photographed under fluorescent light (model: ZF-7 standard) after drying in a drying oven (model: KH-55A) at 120℃ for 25min.

[0136] The test samples were the whitening and stain removal laundry tablet of Example 3, commercially available non-woven fabric whitening tablet A, commercially available non-woven fabric whitening tablet B, commercially available non-woven fabric whitening tablet C, commercially available whitening laundry liquid A and commercially available whitening laundry liquid B.

[0137] The test results are shown in Figures 1-3. Figures 1 and 3 are test groups with a test sample usage of 2g, and Figure 2 is a test group with a test sample usage of 4g.

[0138] According to the test results in Figures 1 and 2, the pure cotton white cloth treated with the whitening and stain removal laundry tablet of Example 3 has good whitening effect. The pure cotton white cloth treated with commercially available non-woven fabric whitening tablets A / B / C does not have as good whitening effect as the whitening and stain removal laundry tablet of Example 3.

[0139] According to the test results in Figure 3, the pure cotton white cloth treated with commercially available whitening laundry liquids A / B can clearly be seen to have uneven distribution of fluorescent whitening agent under fluorescent light. The pure cotton white cloth treated with the whitening and stain removal laundry tablet of Example 3 has uniform distribution of fluorescent whitening agent.

[0140] 2. Whitening value:

[0141] The whiteness value of the pure cotton white cloth was measured by a digital fluorescent whiteness meter (model: WSB-3C), which was the initial whiteness value.

[0142] A piece of pure cotton white cloth was placed in a washing machine together with the test sample (2g, 4g) and washed normally (washing, rinsing, dehydration) with tap water; the water temperature was 25±1℃; the pure cotton white cloth was taken out after the whole washing process was completed.

[0143] Drying oven (Model: KH-55A), 120℃, 25min; the whiteness value of the white cotton cloth after washing was measured by using a digital fluorescence whiteness meter (Model: WSB-3C).

[0144] The whitening value was calculated according to the following calculation method, and the whitening value was recorded in Table 2.

[0145] The calculation method of the whitening value: take five data, exclude the maximum value and the minimum value, and take the average value of the middle three data.

[0146] The detection sample was the whitening and stain removal laundry tablet of Example 1-5, Comparative Example 1, 4-9, the whitening and stain removal laundry liquid of Comparative Example 2-3, the commercially available non-woven fabric whitening tablet A, the commercially available whitening laundry liquid A.

[0147] Table 2

[0148] Test two: stain removal

[0149] According to GB / T 13174-2021 "Determination of Detergency and Repeated Washing Performance of Detergents for Fabrics", the test was carried out.

[0150] The test sample was JB-01 stained cloth, JB-02 stained cloth, JB-03 stained cloth, the test sample was put into the washing machine together with 2g detection sample, and normal machine washing (washing, rinsing, dehydration) was carried out with tap water; water temperature 25±1℃; after the whole washing process was completed, drying oven (Model: KH-55A), 120℃, 25min.

[0151] The stain removal ratio Pi of the test sample after cleaning was calculated, and recorded in Table 3.

[0152] Among them, when Pi≥1.0 is qualified, and Pi<1.0 is unqualified.

[0153] The detection sample was the whitening and stain removal laundry tablet of Example 1-5, Comparative Example 1, 4-9, the whitening and stain removal laundry liquid of Comparative Example 2-3, the commercially available non-woven fabric whitening tablet A, the commercially available whitening laundry liquid A.

[0154] Table 3

[0155] According to the detection data in Tables 2 and 3, the whitening and stain removal laundry tablets of Examples 1-5 have better whitening and stain removal effect on pure cotton cloth than commercially available products.

[0156] Comparative Example 1 uses corn starch to replace the film-forming agent. Although corn starch is also a polyhydroxyl compound, it cannot form a special combination with the special raw materials in the system, thereby affecting the tabletting effect.

[0157] Comparative Example 2 is based on Example 3, and the film-forming agent is omitted to make the product into a liquid. The lack of special combination of the specific film-forming agent with the remaining raw materials causes the effect of Comparative Example 2 to have a more obvious downward trend in whitening and stain removal.

[0158] Comparative Example 3 is a whitening and stain removal laundry liquid that simulates a common product on the market that mixes surfactants and fluorescent whitening agents. The product of Comparative Example 3 has a precipitation phenomenon after standing for 1 h, and the performance is unstable. In Tables 2 and 3, it can also be seen that the whitening and stain removal effects are not good.

[0159] Comparative Examples 4 and 5 omit specific anionic surfactants and nonionic surfactants, respectively, and the products cannot be tabletted.

[0160] Comparative Examples 6 and 7 replace the specific anionic surfactants and nonionic surfactants with other corresponding common surfactants, respectively, which destroys the special combination between the specific surfactants and the film-forming agent and the fluorescent whitening agent, thereby significantly reducing the whitening and stain removal effects.

[0161] Comparative Example 8 omits the adjuvant based on Example 3. Although the performance in whitening and stain removal is not significantly reduced, the wet stability is not good, and improper storage can cause the performance to fail.

[0162] Comparative Example 9 directly mixes the enzyme preparation with other raw materials based on Example 3, so that the performance of the enzyme preparation cannot be fully utilized, especially having a greater impact on the stain removal performance.

[0163] The specific embodiments are merely an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, and as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A whitening laundry detergent tablet, characterized in that, According to the mass percentage, the following raw materials are included: 10-30% film-forming agent, 10-30% anionic surfactant, 3-10% nonionic surfactant, 11-30% fluorescent whitening agent, 0.5-5% anti-fouling 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 film-forming agent A and film-forming agent B; the film-forming agent A is polyvinyl alcohol, and the film-forming agent B includes one or more of polyvinylpyrrolidone and modified polyvinyl alcohol; The anionic surfactant at least includes sodium alkyl sulfate, sodium fatty acid methyl ester sulfonate, and sodium alpha-alkenyl sulfonate. The nonionic surfactant includes one or more of polyglycerol fatty acid ester, fatty alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, secondary alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate, alcohol ether glycoside, and alkyl glucoside.

2. The whitening laundry detergent tablet according to claim 1, wherein: The film-forming agent is film-forming agent A and film-forming agent B; the film-forming agent A is polyvinyl alcohol, and the film-forming agent B is polyvinylpyrrolidone and modified polyvinyl alcohol; The anionic surfactant is sodium alkyl sulfate, sodium fatty acid methyl ester sulfonate, and sodium alpha-alkenyl sulfonate. The nonionic surfactant is polyglycerol fatty acid ester, fatty alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate, and alkyl glucoside.

3. The whitening laundry detergent tablet according to claim 1, wherein: According to the mass percentage, the sodium alkyl sulfate is 8-15%, the sodium fatty acid methyl ester sulfonate is 1-5%, and the sodium alpha-alkenyl sulfonate is 1-3%.

4. The whitening laundry detergent tablet according to claim 2, wherein: 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 laundry detergent tablet according to claim 4, wherein: 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 laundry detergent tablet according to Claim 1, wherein: The fluorescent whitening agent includes one or more of bistriazine aminostilbene whitening agent and stilbene-based biphenyl whitening agent; preferably, according to the mass percentage, the bistriazine aminostilbene whitening agent is 1-5%, and the stilbene-based biphenyl whitening agent is 10-20%.

7. The whitening laundry detergent tablet according to Claim 1, wherein: The auxiliary agent at least includes one or more of polyhydric alcohol and sodium carboxymethyl cellulose.

8. The whitening laundry detergent tablet according to claim 7, wherein: The polyhydric alcohol includes one or more of polysiloxanol, glycerol, propylene glycol, pentylene glycol, butylene glycol, hexylene glycol, and sorbitol.

9. The whitening laundry detergent tablet according to claim 8, wherein: According to the mass percentage, the polysiloxanol is 0.1-0.5%, the glycerol is 0.5-2%, and the sorbitol is 0.1-1%.

10. The whitening laundry detergent tablet according to Claim 1, wherein: The enzyme preparation includes at least two of protease, amylase, lipase, cellulase, pectinase, mannanase, and phosphodiesterase.

11. The whitening laundry detergent tablet according to Claim 1, wherein: The plant extract at least includes soapberry extract, tea tree oil extract, and oil tea dregs extract; preferably, the soapberry extract, tea tree oil extract, and oil tea dregs extract are mixed in a ratio of (0.2-0.4):(0.1-0.3):(0.1-0.2).

12. The whitening laundry detergent tablet according to Claim 1, wherein: The anti-fouling agent is one or both of hydrophobically modified acrylic polymer and water-soluble nonionic polyester.

13. The whitening laundry detergent tablet according to claim 12, wherein: The hydrophobically modified acrylic polymer has a molecular weight of 30000-50000 and a Brookfield viscosity of 0-500 cPs.

14. The whitening laundry detergent tablet according to claim 12, wherein: The hydrophobically modified acrylic polymer is 1-3% and the water-soluble non-ionic polyester is 0.5-2% by mass percentage.

15. A process for the preparation of a whitening laundry detergent tablet according to any one of claims 1 to 14, characterised in that, The method comprises the following steps: Step 1: mix water and film-forming agent at 85-90℃ until uniform; Step 2: add chelating agent and mix until uniform; Step 3: add anionic surfactant, non-ionic surfactant and anti-fouling agent and mix until uniform; Step 4: add fluorescent whitening agent at 50-60℃ and mix until uniform; Step 5: add plant extract and mix until uniform; Step 6: dry and shape the product to obtain semi-finished laundry tablets; Step 7: spray enzyme preparation on the semi-finished laundry tablets to obtain whitening and stain-removing laundry tablets.

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