A salt-tolerant amphoteric polyacrylic acid thickener, preparation method and application thereof

Abstract

The present invention relates to the field of daily chemical technology, and more particularly to a salt-tolerant amphoteric polyacrylic acid thickener, a preparation method and an application thereof; a salt-tolerant amphoteric polyacrylic acid thickener, wherein the raw materials thereof include: anionic monomers; cationic monomers; surfactants; initiators; deionized water; the viscosity of the thickener is 9000-11000; the molecular weights of the anionic monomers and the cationic monomers differ by 200-300; and the mol ratio of the anionic monomers and the cationic monomers is 32:1. The present invention, by studying the raw materials of different molecular weights, finds that when the molecular weights of the anionic monomers and the cationic monomers differ by 200-300, and the mol ratio is 20:1-100:1, more preferably 32:1, a special cationic surfactant is matched simultaneously, a hydrophobic associating thickener can be obtained, which can replace conventional 6501, solve the thickening problem of laundry liquid or dishwashing liquid, and can have both foaming and decontamination capabilities. The salt-containing component in the formula is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of daily chemicals, and in particular to a salt-resistant amphoteric polyacrylic acid thickener, a preparation method and an application thereof. Background Art

[0002] Coconut oil diethanolamide is commonly used as a thickener in daily chemical products containing sulfonic acid and AES to adjust product viscosity. This ingredient may interact with other ingredients, affecting the overall stability and performance of the product. This can lead to problems such as delamination, precipitation, or deterioration during use, thus affecting the consumer experience.

[0003] At the same time, with growing concerns about the safety of daily chemical products, some countries and regions have enacted stricter regulations on the use of potentially harmful ingredients such as cocamide DEA. Cocamide DEA is considered a hazardous substance, its toxicity primarily manifesting in irritation, corrosiveness, and potential inhalation hazards. Long-term exposure to or excessive use of products containing cocamide DEA may adversely affect human health, such as drowsiness, headaches, dizziness, and vomiting. It is important to note that although the amount added to daily chemical products is typically low, the cumulative effects of long-term use cannot be ignored. This requires daily chemical companies to strictly adhere to relevant regulations during the production process to ensure the safety and legality of their products. However, this may also lead to greater challenges for companies in formula selection and cost control.

[0004] The object of the present invention is to provide a thickener capable of thickening a nonionic system and a preparation method thereof, so as to solve the above-mentioned problems. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a salt-tolerant amphoteric polyacrylic acid thickener, the raw materials for its preparation include:

[0006] anionic monomers;

[0007] Cationic monomers;

[0008] surfactants;

[0009] initiator;

[0010] Deionized water;

[0011] The viscosity of the thickener is 9000-11000; the molecular weight difference between the anionic monomer and the cationic monomer is 200-300;

[0012] The molar ratio of the anionic monomer to the cationic monomer is 32:1.

[0013] As an embodiment of the present invention, the anionic monomer is selected from one or more of acrylic acid, 2-propoxy neopentyl glycol diacrylate, maleic anhydride, triphenyl ethylphenol polyoxyethylene ether methacrylate SEM-25, behenyl polyoxyethylene ether methacrylate, and AMPS.

[0014] As an embodiment of the present invention, the molecular weight of the anionic monomer is less than 100.

[0015] As an embodiment of the present invention, the anionic monomer is acrylic acid or maleic anhydride.

[0016] As an embodiment of the present invention, the cationic monomer is selected from one or more of acrylamide, dimethyldiallyl ammonium chloride, methacryloyloxyethyltrimethylammonium chloride DMC, hexadecyldimethylallyl ammonium chloride, diethyl maleate bis(ethylene), carboxymethyloctadecylmethyldiallyl ammonium chloride, and polymerizable quaternary ammonium salts.

[0017] As an embodiment of the present invention, the molecular weight of the cationic monomer is greater than 300 and less than 500.

[0018] As an embodiment of the present invention, the cationic monomer is hexadecyldimethylallylammonium chloride or carboxymethyloctadecylmethyldiallylammonium chloride.

[0019] As an embodiment of the present invention, the surfactant is a cationic surfactant, and the cationic surfactant contains at least two cationic groups.

[0020] As an embodiment of the present invention, the salt-tolerant amphoteric polyacrylic acid thickener is applied to cleaning products containing sulfonic acid and AES.

[0021] As an embodiment of the present invention, the preparation method of the salt-tolerant amphoteric polyacrylic acid thickener comprises the following steps:

[0022] Add a certain amount of pure water and heat to 70-95°C. At the same time, add the mixed solution of anionic monomer and cationic monomer, sodium persulfate solution and sodium metabisulfite solution dropwise. The addition time is 1.5-3h. After the addition is completed, keep warm at 70-95°C for 0.5-2h. After the insulation is completed, add water to cool down, add the remaining raw materials, and stir evenly.

[0023] By adopting the above technical solution, the present invention has the following beneficial effects:

[0024] By studying raw materials with different molecular weights, the present invention discovered that when the molecular weight difference between the anionic monomer and the cationic monomer is 200 to 300, and the molar ratio is between 20:1 and 100:1, preferably 32:1, and a special cationic surfactant is added, a hydrophobically associating thickener can be obtained. This can replace the commonly used 6501, solve the thickening problem of laundry detergents or dishwashing liquids, and simultaneously provide both foaming and detergency. The salt content in the formula is not affected. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] The present invention provides a salt-tolerant amphoteric polyacrylic acid thickener, the raw materials for preparing the same include:

[0027] anionic monomers;

[0028] Cationic monomers;

[0029] surfactants;

[0030] initiator;

[0031] Deionized water;

[0032] Alkyl glycosides;

[0033] The viscosity of the thickener is 9000-11000; the molecular weight difference between the anionic monomer and the cationic monomer is 200-300;

[0034] The molar ratio of the anionic monomer to the cationic monomer is 32:1.

[0035] The present invention will be further explained below with reference to specific embodiments.

[0036] Example 1

[0037] Add 160g of pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g of acrylic acid, 12.5g of hexadecyldimethylallyl ammonium chloride (molecular weight 341), and 12.5g of tetradecyl polyoxyethylene ether diquaternary ammonium salt (Henan Daochun New Material Technology Co., Ltd.), 14g of sodium persulfate solution (mass concentration 10%), and 14g of sodium metabisulfite solution (mass concentration 10%). The addition time is 2.5-3h. After the addition is completed, keep warm at 90-95°C for 0.5h. After the insulation is completed, add water to cool (90g), add 80g of alkyl glycoside, and stir evenly.

[0038] Example 2

[0039] Add 160g of pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g of acrylic acid, 6.25g of dimethyldiallylammonium chloride (molecular weight 161.67), 12.5g of tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g of sodium persulfate solution (mass concentration 10%), and 14g of sodium metabisulfite solution (mass concentration 10%). The addition time is 2.5-3h. After the addition is complete, keep warm at 90-95°C for 0.5h. After the insulation is completed, add water to cool (90g), add 80g of alkyl glycoside, and stir evenly.

[0040] Example 3

[0041] Add 160g of pure water and heat to 90-95°C. Simultaneously, add dropwise a mixed solution of 85g of acrylic acid, 38.7g of polymerizable quaternary ammonium salt R3033 (molecular weight about 1000), 12.5g of tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g of sodium persulfate solution (mass concentration 10%), and 14g of sodium metabisulfite solution (mass concentration 10%). The addition time is 2.5-3h. After completion of the dropwise addition, keep the mixture at 90-95°C for 0.5h. After the insulation is completed, add water to cool the mixture (90g), add 80g of alkyl glycoside, and stir evenly.

[0042] Example 4

[0043] Add 160g of pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g of acrylic acid, 6.25g of hexadecyldimethylallyl ammonium chloride and 12.5g of tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g of sodium persulfate solution (mass concentration 10%), and 14g of sodium metabisulfite solution (mass concentration 10%). The addition time is 2.5-3h. After the addition is complete, keep warm at 90-95°C for 0.5h. After the insulation is completed, add water to cool (90g), add 80g of alkyl glycoside, and stir evenly.

[0044] Example 5

[0045] Add 160g of pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g of acrylic acid, 25g of hexadecyldimethylallyl ammonium chloride and 12.5g of tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g of sodium persulfate solution (mass concentration 10%), and 14g of sodium metabisulfite solution (mass concentration 10%). The addition time is 2.5-3h. After the addition is complete, keep warm at 90-95°C for 0.5h. After the insulation is completed, add water to cool (90g), add 80g of alkyl glycoside, and stir evenly.

[0046] Comparative Example 1

[0047] Add 160g of pure water and heat to 90-95°C. Simultaneously, add dropwise a mixed solution of 85g of acrylic acid, 8.13g of triphenyl phenol polyoxyethylene ether methacrylate SEM-25 (molecular weight 544), 12.5g of tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g of sodium persulfate solution (mass concentration 10%), and 14g of sodium metabisulfite solution (mass concentration 10%). The addition time is 2.5-3h. After the addition is complete, keep warm at 90-95°C for 0.5h. After the insulation is completed, add water (90g) to cool the mixture, add 80g of alkyl glycoside, and stir evenly.

[0048] Comparative Example 2

[0049] Add 160g of pure water and heat to 90-95°C. Simultaneously, add dropwise a mixed solution of 85g of acrylic acid, 4.9g of 2-propoxy neopentyl glycol diacrylate (molecular weight 328), 12.5g of tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g of sodium persulfate solution (mass concentration 10%), and 14g of sodium metabisulfite solution (mass concentration 10%). The addition time is 2.5-3h. After the addition is complete, keep warm at 90-95°C for 0.5h. After the insulation is completed, add water (90g) to cool the mixture, add 80g of alkyl glycoside, and stir evenly.

[0050] Comparative Example 3

[0051] Add 160g of pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g of acrylic acid, 10g of maleic anhydride (molecular weight 98), 12.5g of tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g of sodium persulfate solution (mass concentration 10%), and 14g of sodium metabisulfite solution (mass concentration 10%). The addition time is 2.5-3h. After the addition is complete, keep warm at 90-95°C for 0.5h. After the insulation is completed, add water to cool (90g), add 80g of alkyl glycoside, and stir evenly.

[0052] Comparative Example 4

[0053] Add 160g of pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g of acrylic acid, 12.5g of hexadecyldimethylallyl ammonium chloride (molecular weight 341), and 12.5g of tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g of sodium persulfate solution (mass concentration 10%), and 14g of sodium metabisulfite solution (mass concentration 10%). The addition time is 2.5-3h. After the addition is complete, keep warm at 90-95°C for 0.5h. After the insulation is completed, add water to cool (90g) and stir evenly.

[0054] Comparative Example 5

[0055] Add 160g of pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g of acrylic acid and 12.5g of hexadecyldimethylallyl ammonium chloride (molecular weight 341), 14g of sodium persulfate solution (mass concentration 10%), and 14g of sodium metabisulfite solution (mass concentration 10%). The addition time is 2.5-3h. After the addition is complete, keep warm at 90-95°C for 0.5h. After the insulation is completed, add water (90g) to cool the mixture, and add 80g of alkyl glycoside and 12.5g of tetradecyl polyoxyethylene ether diquaternary ammonium salt, and stir evenly.

[0056] Performance Testing

[0057] Test 1: Viscosity test and physical appearance observation.

[0058] Table 1 Test results of test 1

[0059]

[0060]

[0061] Test 2: Example 1 to Comparative Example 5 were added to the basic washing and care formula to check the detergency.

[0062] Table 2 Test results of test 2

[0063]

[0064]

[0065] If the thickening effect and stability are not achieved, there is no need to measure the detergency. Test 3: Comparison of the effect and stability of different salt addition amounts in Example 1

[0066]

[0067]

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A salt-tolerant amphoteric polyacrylic acid thickener, characterized in that: The raw materials for its preparation include: Anionic monomer, cationic monomer, surfactant, initiator, deionized water, alkyl polyglycoside, sodium metabisulfite solution; The anionic monomer is acrylic acid; The molecular weight of the cationic monomer is greater than 300 and less than 500; the molecular weight difference between the anionic monomer and the cationic monomer is 200-300, and the molar ratio of the anionic monomer to the cationic monomer is 32:1; The surfactant is a cationic surfactant containing at least two cationic groups; The cationic monomer is selected from one or more of acrylamide, dimethyldiallyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride DMC, hexadecyl dimethylallyl ammonium chloride, diethyl maleate ethylene bis(ethylene), carboxymethyl octadecyl methyldiallyl ammonium chloride, and polymerizable quaternary ammonium salts; The viscosity of the thickener is 9000-11000 Pa·s.

2. A salt-tolerant amphoteric polyacrylic acid thickener according to claim 1, characterized in that, The thickener is applied to cleaning products containing sulfonic acid and AES.

3. The method for preparing a salt-tolerant amphoteric polyacrylic acid thickener according to claim 1, wherein Here are the steps: Add a certain amount of pure water and heat to 70-95°C. At the same time, add the mixed solution of anionic monomer and cationic monomer, sodium persulfate solution and sodium metabisulfite solution dropwise. The addition time is 1.5-3h. After the addition is completed, keep warm at 70-95°C for 0.5-2h. After the insulation is completed, add water to cool down, add the remaining raw materials, and stir evenly.

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