Salt-tolerant amphoteric polyacrylic acid thickening agent as well as preparation method and application thereof

Abstract

The invention relates to the technical field of daily chemicals, in particular to a salt-tolerant amphoteric polyacrylic acid thickening agent, a preparation method and application. The salt-tolerant amphoteric polyacrylic acid thickener is prepared from the following raw materials: an anionic monomer; a cationic monomer; a surfactant; an initiator; deionized water; the viscosity of the thickening agent ranges from 9000 to 11000; the molecular weight difference between the anionic monomer and the cationic monomer is 200-300; the molar ratio of the anionic monomer to the cationic monomer is 32: 1. Research on preparation raw materials with different molecular weights shows that when the molecular weight difference of an anionic monomer and a cationic monomer is 200-300 and the molar ratio of the anionic monomer to the cationic monomer is 20: 1-100: 1 and is more than 32: 1, the hydrophobic association type thickener can be obtained by matching with a special cationic surfactant and can replace common 6501, the thickening problem of a laundry detergent or a detergent is solved, and the hydrophobic association type thickener can be applied to the field of laundry detergents or detergents. Meanwhile, the foaming and dirt-removing capabilities are realized at the same time. And salt-containing components in the formula are not influenced.

Description

Technical Field

[0001] The 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] In the application system of daily chemical products containing sulfonic acid and AES, coconut oil diethanolamide is usually used as a thickener to adjust the viscosity of the product. This ingredient may interact with other ingredients and affect the overall stability and performance of the product. This may cause problems such as stratification, precipitation or deterioration of the product during use, thus affecting the consumer's experience.

[0003] At the same time, with the increasing concern about the safety of daily chemical products, some countries and regions have formulated stricter regulations on the use of potentially harmful ingredients such as cocamide DEA. Cocamide DEA is considered a harmful substance, and its toxicity is mainly manifested in irritation, corrosiveness and potential inhalation hazards. Long-term contact or excessive use of products containing cocamide DEA may have adverse effects on human health, such as causing symptoms such as drowsiness, headache, dizziness, and vomiting. It should be noted that although the amount added to daily chemical products is usually low, its cumulative effect of long-term use cannot be ignored. This requires daily chemical companies to strictly comply with relevant regulatory requirements 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 phenol 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, dimethyldiallylammonium chloride, methacryloyloxyethyltrimethylammonium chloride DMC, hexadecyldimethylallylammonium chloride, diethyl maleate bis(ethylene), carboxymethyloctadecylmethyldiallylammonium 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 2 cationic groups.

[0020] As an embodiment of the present invention, the salt-resistant 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, heat to 70-95°C, and simultaneously drip the mixed solution of anionic monomer and cationic monomer, sodium persulfate solution, and sodium metabisulfite solution. The dripping time is 1.5-3h. After the dripping 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] The present invention studies the preparation raw materials with different molecular weights and finds that when the molecular weight difference between the anionic monomer and the cationic monomer is 200-300, and the molar ratio is 20:1-100:1, more preferably 32:1, and a special cationic surfactant is matched at the same time, a hydrophobic associative thickener can be obtained, which can replace the commonly used 6501, solve the thickening problem of laundry detergent or dishwashing liquid, and have both foaming and decontamination capabilities. The salt component 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 described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The present invention provides a salt-tolerant amphoteric polyacrylic acid thickener, and 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 is further explained below in conjunction with specific implementation modes.

[0036] Example 1

[0037] Add 160g pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g acrylic acid, 12.5g hexadecyl dimethyl allyl ammonium chloride (molecular weight 341) and 12.5g tetradecyl polyoxyethylene ether diquaternary ammonium salt (Henan Daochun New Material Technology Co., Ltd.), 14g sodium persulfate solution (mass concentration 10%), and 14g sodium pyrosulfite 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 down (90g), add 80g alkyl glycoside, and stir evenly.

[0038] Example 2

[0039] Add 160g pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g acrylic acid, 6.25g dimethyldiallyl ammonium chloride (molecular weight 161.67), 12.5g tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g sodium persulfate solution (mass concentration 10%), and 14g sodium pyrosulfite 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 alkyl glycoside, and stir evenly.

[0040] Example 3

[0041] Add 160g pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g acrylic acid, 38.7g polymerizable quaternary ammonium salt R3033 (molecular weight about 1000) and 12.5g tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g sodium persulfate solution (mass concentration 10%) and 14g sodium pyrosulfite 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 alkyl glycoside and stir evenly.

[0042] Example 4

[0043] Add 160g pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g acrylic acid, 6.25g hexadecyl dimethyl allyl ammonium chloride and 12.5g tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g sodium persulfate solution (mass concentration 10%) and 14g sodium pyrosulfite 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 alkyl glycoside and stir evenly.

[0044] Example 5

[0045] Add 160g pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g acrylic acid, 25g hexadecyl dimethyl allyl ammonium chloride and 12.5g tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g sodium persulfate solution (mass concentration 10%) and 14g sodium pyrosulfite 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 alkyl glycoside and stir evenly.

[0046] Comparative Example 1

[0047] 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, 8.13g of triphenyl phenol polyoxyethylene ether methacrylate SEM-25 (molecular weight 544) and 12.5g of tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g of sodium persulfate solution (mass concentration 10%) and 14g of sodium pyrosulfite 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.

[0048] Comparative Example 2

[0049] 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, 4.9g of 2-propoxy neopentyl glycol diacrylate (molecular weight 328) and 12.5g of tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g of sodium persulfate solution (mass concentration 10%) and 14g of sodium pyrosulfite 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.

[0050] Comparative Example 3

[0051] Add 160g pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g acrylic acid, 10g maleic anhydride (molecular weight 98), 12.5g tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g sodium persulfate solution (mass concentration 10%), and 14g sodium pyrosulfite 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 alkyl glycoside, and stir evenly.

[0052] Comparative Example 4

[0053] Add 160g pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g acrylic acid, 12.5g hexadecyl dimethyl allyl ammonium chloride (molecular weight 341) and 12.5g tetradecyl polyoxyethylene ether diquaternary ammonium salt, 14g sodium persulfate solution (mass concentration 10%) and 14g sodium pyrosulfite 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 down (90g) and stir evenly.

[0054] Comparative Example 5

[0055] Add 160g pure water and heat to 90-95°C. At the same time, add dropwise a mixed solution of 85g acrylic acid and 12.5g hexadecyl dimethyl allyl ammonium chloride (molecular weight 341), 14g sodium persulfate solution (mass concentration 10%), and 14g sodium pyrosulfite 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), and add 80g alkyl glycoside and 12.5g 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: Add Example 1 to Comparative Example 5 into the basic washing and care formula to check the detergency.

[0062] Table 2 Test results of test 2

[0063]

[0064]

[0065] When 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned 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 monomers; Cationic monomers; Surfactants; Initiator; Deionized water; The viscosity of the thickener is 9000-11000; the molecular weight difference between the anionic monomer and the cationic monomer is 200-300; The molar ratio of the anionic monomer to the cationic monomer is 32:

1.

2. A salt-tolerant amphoteric polyacrylic acid thickener according to claim 1, characterized in that: The anionic monomer is selected from one or more of acrylic acid, 2-propoxylated neopentyl glycol diacrylate, maleic anhydride, triphenyl phenol polyoxyethylene ether methacrylate SEM-25, behenyl polyoxyethylene ether methacrylate, and AMPS.

3. A salt-tolerant amphoteric polyacrylic acid thickener according to claim 2, characterized in that: The molecular weight of the anionic monomer is less than 100.

4. A salt-tolerant amphoteric polyacrylic acid thickener according to claim 2, characterized in that: The anionic monomer is acrylic acid or maleic anhydride.

5. A salt-tolerant amphoteric polyacrylic acid thickener according to claim 1, characterized in that: The cationic monomer is selected from one or more of acrylamide, dimethyldiallylammonium chloride, methacryloyloxyethyltrimethylammonium chloride DMC, hexadecyldimethylallylammonium chloride, diethyl maleate bis(ethylene), carboxymethyloctadecylmethyldiallylammonium chloride, and polymerizable quaternary ammonium salts.

6. A salt-tolerant amphoteric polyacrylic acid thickener according to claim 5, characterized in that: The molecular weight of the cationic monomer is greater than 300 and less than 500.

7. A salt-tolerant amphoteric polyacrylic acid thickener according to claim 5, characterized in that: The cationic monomer is hexadecyldimethylallylammonium chloride or carboxymethyloctadecylmethyldiallylammonium chloride.

8. A salt-tolerant amphoteric polyacrylic acid thickener according to claim 1, characterized in that: The surfactant is a cationic surfactant, and the cationic surfactant contains at least 2 cationic groups.

9. A salt-tolerant amphoteric polyacrylic acid thickener according to any one of claims 1 to 8, characterized in that: The thickener is applied to cleaning products containing sulfonic acid and AES.

10. The method for preparing a salt-tolerant amphoteric polyacrylic acid thickener according to any one of claims 1 to 8, characterized in that: Here are the steps: Add a certain amount of pure water, heat to 70-95°C, and simultaneously drip the mixed solution of anionic monomer and cationic monomer, sodium persulfate solution, and sodium metabisulfite solution. The dripping time is 1.5-3h. After the dripping 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.

Images