A washing sheet based on natural sources and a method for preparing the same

Abstract

The application belongs to the field of daily chemicals, and discloses a washing tablet based on natural sources, which comprises an anionic film former, a non-ionic film former, a polyhydric alcohol, a surfactant and vegetable fat; the weight ratio of the anionic film former, the non-ionic film former, the polyhydric alcohol, the surfactant and the vegetable fat is 40-60:0.2-1:4-6:10-35:1-3; the surfactant contains a polyether surfactant; the polyether surfactant accounts for 20-70 wt% of the total weight of the surfactant. The washing tablet uses the anionic film former and the non-ionic film former as film forming substrates, uses the polyhydric alcohol as a film removing agent and a flexibility modifier, and uses the vegetable fat and the polyether surfactant as toughening and reinforcing agents, so that the tensile strength and the elongation at break of the washing tablet can be significantly improved, the washing tablet can better maintain the basic form before use, and powder dropping and breakage can be avoided. Meanwhile, the application also discloses a preparation method of the washing tablet.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of daily chemical industry, and in particular to a washing tablet based on natural sources and a preparation method thereof. BACKGROUND

[0002] The film-forming materials of existing laundry tablets and dishwashing tablets are mostly divided into two categories: one is a water-soluble synthetic polymer film-forming agent represented by PVA (polyvinyl alcohol), and the other is a film-forming agent represented by natural polymer materials; the film-forming materials of natural polymer materials are rarely reported in the literature, such as:

[0003] Patent application with publication number CN106753866A, entitled "Laundry tablet with good dissolution performance and preparation method thereof", uses waxy rice syrup to replace other chemical film-forming agents such as polyvinyl alcohol;

[0004] Patent application with publication number CN107090362A, entitled "Super-concentrated antibacterial laundry tablet and preparation method thereof", can use hydroxypropyl methyl cellulose as a film-forming agent, and a small amount of carboxymethyl chitosan is added.

[0005] In the research process of the present project, it is found that, from the perspective of physical properties, PVA is undoubtedly the best material, which can meet the requirements of tensile strength > 50 N / mm 2 , and elongation at break > 20%. If natural source materials are used as film materials to prepare washing tablets, a major problem is that the strength and toughness cannot meet the requirements, and problems such as powder falling and breaking occur during production, storage and use.

[0006] The purpose of the present application is to provide a washing tablet based on natural sources, which uses anionic film-forming agent and non-ionic film-forming agent as film-forming base material, uses polyol as film-removing agent and flexibility modifier, and uses vegetable oil and polyether surfactant as toughening and strengthening agent, which can significantly improve the tensile strength and elongation at break of the washing tablet, so that the washing tablet can better maintain the basic form before use, and avoid problems such as powder falling and breaking.

[0007] Meanwhile, the present application also discloses a preparation method of the washing tablet.

[0008] To achieve the above-mentioned purpose, the present application discloses:

[0009] A washing tablet based on natural sources, characterized in that it comprises anionic film-forming agent, non-ionic film-forming agent, polyol, surfactant and vegetable oil; the weight ratio of the anionic film-forming agent, non-ionic film-forming agent, polyol, surfactant and vegetable oil is 40-60:0.2-1:4-6:10-35:1-3.

[0010] The polyether surfactant accounts for 20-70wt% of the total weight of the surfactant.

[0011] The anionic film-forming agent and the nonionic film-forming agent of the present application are natural film-forming agents, and the use of such film-forming agents for the preparation of washing tablets results in easy breakage and excessive powder loss. In order to solve this problem, the use of polyols, vegetable fats and oils and polyether surfactants for enhancing and toughening can effectively solve the flexibility and strength of the washing tablets prepared from natural film-forming agents.

[0012] Among them, vegetable fat has a great effect on enhancing the flexibility of washing tablets, and polyether surfactant has a great effect on enhancing the strength of washing tablets, and the combination of the two and the action of polyol can achieve the basic purpose of the present application.

[0013] In the above-mentioned washing tablets based on natural sources, the polyether surfactant is an anionic surfactant or a nonionic surfactant; the polyether surfactant accounts for 30-50wt% of the total weight of the surfactant.

[0014] In the above-mentioned washing tablets based on natural sources, the anionic film-forming agent is one or a combination of carboxymethyl chitosan, carboxymethyl starch sodium, xanthan gum and carboxymethyl cellulose sodium.

[0015] In the present application, it is more preferred to combine carboxymethyl chitosan and carboxymethyl starch sodium, in which carboxymethyl chitosan is used as the basic film-forming agent, and carboxymethyl starch sodium is used as a disintegrating agent that can quickly swell when it comes into contact with water; combined with the rapid water absorption of the nonionic film-forming agent, a water replenishment channel is constructed to the inside of the washing tablet, which can significantly improve the swelling speed of the washing tablet.

[0016] In the above-mentioned washing tablets based on natural sources, the anionic film-forming agent is carboxymethyl chitosan and carboxymethyl starch sodium, and the weight ratio of carboxymethyl chitosan and carboxymethyl starch sodium is 4-6:2.

[0017] In the above-mentioned washing tablets based on natural sources, the nonionic film-forming agent is guar gum.

[0018] In the present application, other nonionic film-forming agents are not excluded, and we believe that other nonionic film-forming agents also have the effect of quickly constructing a water replenishment channel inside the washing tablet.

[0019] In the above-mentioned washing tablets based on natural sources, the polyol is one or a combination of glycerol, propylene glycol and 1,2-butanediol.

[0020] It is found from the actual research process that glycerol, propylene glycol and 1,2-butanediol can play the role of softening, and the effect of glycerol is more obvious from the perspective of demolding.

[0021] The vegetable oil is one or a combination of camellia oil, jojoba seed oil, olive oil and sunflower seed oil.

[0022] In the above washing tablet based on natural sources, the surfactant is an anionic surfactant, or a combination of an anionic surfactant and a nonionic surfactant.

[0023] The anionic surfactant is one or a combination of sodium alpha-olefin sulfonate, sodium dodecyl sulfate, sodium fatty acid methyl ester sulfonate, sodium stearate, sodium dodecyl polyether sulfate, dodecyl polyether sulfate ammonium, and sodium fatty acid methyl ester ethoxysulfonate.

[0024] The nonionic surfactant is one or a combination of fatty alcohol polyoxyethylene ether, cocamide, and alkyl glycoside.

[0025] The polyether surfactant is one or a combination of sodium dodecyl polyether sulfate, dodecyl polyether sulfate ammonium, and fatty alcohol polyoxyethylene ether.

[0026] The anionic surfactant accounts for 80-100wt% of the surfactant.

[0027] The weight ratio of the anionic film former, the nonionic film former, the polyol, the surfactant, and the vegetable oil is 45-60:0.2-1:4-6:25-35:1.5-2.5.

[0028] In the above washing tablet based on natural sources, the washing tablet is a laundry tablet or a dishwashing tablet; the thickness of the washing tablet is not more than 2mm, preferably not more than 1mm.

[0029] Meanwhile, the application also discloses a preparation method of the washing tablet as described above, comprising the following steps:

[0030] Step 1: adding the anionic film former, the nonionic film former, and the polyol into an acetic acid solution and dissolving at 40-60℃;

[0031] Step 2: adding the surfactant into the solution of step 1 and dissolving and dispersing;

[0032] Step 3: adding the vegetable oil into the solution of step 2 and stirring and dispersing;

[0033] Step 4: pouring and drying the solution obtained in step 3 to obtain the washing tablet.

[0034] In the above preparation method, the acetic acid concentration in the acetic acid solution is 2wt%; the acetic acid solution accounts for 70-80wt% of the total weight of the anionic film-forming agent, the non-ionic film-forming agent, the surfactant, the polyol, the vegetable fat, and the acetic acid solution.

[0035] The present application has at least the following beneficial effects:

[0036] The present application uses an anionic film-forming agent and a non-ionic film-forming agent as a film-forming base material, uses a polyol as a release agent and a flexibility modifier, and uses a vegetable fat and a polyether surfactant as a toughening and reinforcing agent, which can significantly improve the tensile strength and elongation at break of the washing tablet, so that the washing tablet can better maintain the basic form before use, and avoid powdering, breaking, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a static photo of the dishwashing tablet of the present application. DETAILED DESCRIPTION

[0038] The present application will be described in detail below with reference to the embodiments of the present application. In the description of the present application, it should be noted that, if specific conditions are not indicated in the embodiments, conventional conditions or manufacturer-recommended conditions are used. If the manufacturer of the reagent or instrument is not indicated, it is a conventional product that can be purchased on the market. Unless otherwise specified, the parts used in the embodiments of the present application are weight parts.

[0039] Examples and Comparative Examples

[0040] A preparation method of a dishwashing tablet, comprising the following steps:

[0041] Step 1: Dissolve the anionic film-forming agent and the non-ionic film-forming agent in the acetic acid solution at 50°C; the acetic acid concentration in the acetic acid solution is 2wt%; the amount of the acetic acid solution is 80wt% of the total weight of the anionic film-forming agent, the non-ionic film-forming agent, the surfactant, the polyol, the vegetable fat, and the acetic acid solution;

[0042] After the above film-forming agent is uniformly dispersed, glycerol is added, and stirring is continued. After uniform stirring, step 2 is performed.

[0043] Step 2: Dissolve and disperse the surfactant in the solution of step 1;

[0044] Step 3: Stir and disperse the vegetable fat in the solution of step 2;

[0045] Step 4: Pour and dry the product obtained in step 3 to obtain a dishwashing tablet. The photo of the dishwashing tablet is shown in Figure 1 .

[0046] The specifications of the sheet-shaped washing product are: thickness 1 mm; length * width 100 mm * 40 mm.

[0047] The relevant formula can refer to Table 1;

[0048] Table 1 Formula Table Unit: g

[0049] Carboxymethyl chitosan Sodium carboxymethyl starch Sodium carboxymethyl cellulose Guar gum Glycerol 1,2-Butanediol Camellia oil Jojoba seed oil Olive oil Sodium dodecyl sulfate Fatty acid methyl ester sodium ethoxysulfate Sodium dodecyl polyether sulfate Fatty alcohol polyoxyethylene ether Alkyl glycoside Example 1 34 16 0 1 4 2 2 0 0 9 0 21 0 0 Example 2 34 16 0 1 4 2 2 0 0 24 0 6 0 0 Example 3 34 16 0 1 4 2 2 0 0 15 0 15 0 0 Example 4 34 16 0 1 4 2 2 0 0 0 9 15 6 0 Example 5 34 16 0 0.2 5 0 1 0 0 0 10 15 0 5 Example 6 0 16 34 0.5 6 0 3 0 0 0 15 15 0 0 Example 7 50 0 0 1 4 2 2 0 0 0 15 15 0 0 Example 8 0 0 50 1 4 2 2 0 0 0 15 15 0 0 Example 9 30 10 0 1 4 2 0 2 0 9 0 21 0 0 Example 10 40 20 0 1 4 2 0 0 2 9 0 21 0 0 Comparative Example 1 34 16 0 1 0 0 2 0 0 9 0 21 0 0 Comparative Example 2 34 16 0 1 4 2 2 0 0 21 9 0 0 0 Comparative Example 3 34 16 0 1 4 2 2 0 0 27 0 3 0 0 Comparative Example 4 34 16 0 1 4 2 0 0 0 9 0 21 0 0 Comparative Example 5 34 16 0 0 4 2 2 0 0 9 0 21 0 0

[0050] Performance test

[0051] The test is divided into three parts: static swelling speed test; dynamic swelling speed test; tensile strength test; elongation at break test;

[0052] The test method of static swelling speed test is: 1 piece of dishwashing tablet is placed in 1 L of tap water, and the time required for complete swelling to a film form that cannot be clearly identified by naked eye is observed; static swelling test is counted as 1 min when more than 30 s, and as 0 min when less than 30 s.

[0053] The test method of dynamic swelling speed test is: 1 piece of dishwashing tablet is placed in a 1 L container containing 1 L of tap water, and at the same time, the container is constantly supplemented with external tap water at a supplementing speed of 0.5 L / min, and the time required for complete swelling to a film form that cannot be clearly identified by naked eye is observed; dynamic swelling test is counted to the second.

[0054] Tensile strength test:

[0055] Referring to GB / T 10654-2001, “Determination of Tensile Strength and Elongation at Break of Porous Elastic Materials of High Polymers”, the sample tensile strength test is carried out at a test rate of 2 mm / min.

[0056] Elongation at break test:

[0057] Referring to GB / T 10654-2001, “Determination of Tensile Strength and Elongation at Break of Porous Elastic Materials of High Polymers”, the sample elongation at break test is carried out at a test rate of 2 mm / min.

[0058] At the same time, the difficulty of demolding of the dishwashing tablet is recorded to determine the difficulty of demolding.

[0059] The specific results can be seen in Table 2;

[0060] Table 2 Swelling speed test results

[0061] Static swelling time / min Dynamic swelling time Tensile strength / N / mm 2 ]] Elongation at break / % Whether there is residue of demolding Example 1 17 3min40s 63 27 No Example 2 18 3min24s 51 22 No Example 3 17 3min47s 62 25 No Example 4 18 4min04s 62 24 No Example 5 20 4min15s 69 26 No Example 6 38 12min25s 68 29 No Example 7 39 11min38s 74 31 No Example 8 44 13min09s 66 28 No Example 9 19 4min14s 56 25 No Example 10 20 4min21s 61 28 No Comparative Example 1 18 3min55s 58 16 Yes Comparative Example 2 16 3min32s 36 21 No Comparative Example 3 16 4min12s 41 23 No Comparative Example 4 16 4min28s 37 14 No Comparative Example 5 28 9min20s 58 22 No

[0062] 1. As can be seen from Examples 1 to 10 and Comparative Examples 1 to 4, when any one of the polyol, vegetable fat, polyether surfactant is absent, the tensile strength and / or elongation at break will be reduced, and the absence of polyol will also cause difficulty in demolding.

[0063] 2. As can be seen from Examples 1 to 5, 9, 10 and Comparative Examples 6 to 8, in terms of the film-forming agent, the combination of carboxymethyl chitosan, sodium carboxymethyl starch and guar gum can achieve a synergistic balance of swelling speed and physical strength; as can be seen from Examples 1 to 5 and Comparative Example 5, the non-ionic film-forming agent guar gum can construct water absorption channels to improve the swelling speed, and the effect of guar gum on the structural strength of the dishwashing tablet is not obvious.

[0064] From the perspective of improving the structural strength of the dishwashing tablet, controlling the weight ratio of the anionic film-forming agent, the non-ionic film-forming agent, the polyol, the surfactant and the vegetable fat to be 40-60:0.2-1:4-6:10-35:1-3 and reasonably controlling the use of the polyether surfactant can achieve the purpose;

[0065] From the perspective of improving the structural strength and the swelling speed of the dishwashing tablet, the anionic film-forming agent is preferably carboxymethyl chitosan and sodium carboxymethyl starch, and the weight ratio is 4-6:2.

[0066] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and it is intended that all changes and modifications which come within the meaning and range of equivalency of the claims are resolvable. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

Claims

1. A washing sheet based on natural sources, characterized in that, The anionic film-forming agent, non-ionic film-forming agent, polyol, surfactant, and vegetable oil and fat are in a weight ratio of 40-60:0.2-1:4-6:10-35:1-3. The anionic film-forming agent is carboxymethyl chitosan and sodium carboxymethyl starch, and the weight ratio of the carboxymethyl chitosan and sodium carboxymethyl starch is 4-6:

2. The non-ionic film-forming agent is guar gum. The polyol is one or a combination of glycerol and 1,2-butanediol. The vegetable oil and fat is one or a combination of camellia oil, jojoba seed oil, and olive oil. The surfactant is an anionic surfactant or a combination of an anionic surfactant and a non-ionic surfactant. The anionic surfactant is one or a combination of sodium dodecyl sulfate, sodium dodecyl polyether sulfate, and sodium fatty acid methyl ester ethoxylated sulfonate. The non-ionic surfactant is one or a combination of fatty alcohol polyoxyethylene ether and alkyl glycoside; the amount of sodium dodecyl polyether sulfate or the total amount of sodium dodecyl polyether sulfate and fatty alcohol polyoxyethylene ether accounts for 30-50% of the total weight of the surfactant. The anionic surfactant accounts for 80-100wt% of the surfactant.

2. The washing sheet according to claim 1, wherein The weight ratio of the anionic film-forming agent, non-ionic film-forming agent, polyol, surfactant, and vegetable oil and fat is 45-60. 0.2～1：4～6：25～35：1.5～2.5。 3. The washing sheet according to claim 1, wherein The washing tablet is a laundry tablet or a dishwashing tablet; the thickness of the washing tablet is not more than 2mm.

4. A method of producing the washing sheet according to claim 1 or 2, characterized by, The method comprises the following steps: Step 1: adding the anionic film-forming agent, non-ionic film-forming agent, and polyol into an acetic acid solution and dissolving at 40-60℃; Step 2: adding the surfactant into the solution of Step 1 and dissolving and dispersing; Step 3: adding the vegetable oil and fat into the solution of Step 2 and stirring and dispersing; Step 4: pouring and drying the solution obtained in Step 3 to obtain the washing tablet.

5. The preparation method according to claim 4, characterized in that, The concentration of acetic acid in the acetic acid solution is 2wt%; the acetic acid solution accounts for 70-80wt% of the total weight of the anionic film-forming agent, non-ionic film-forming agent, surfactant, polyol, vegetable oil and fat, and acetic acid solution.

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