Papermaking styrene-acrylic emulsion sizing agent with adjustable and controllable charge property and charge quantity

Abstract

The invention provides a styrene-acrylic emulsion sizing agent with adjustable and controllable charge property and charge quantity for papermaking. The styrene-acrylic emulsion sizing agent comprises deionized water, ammonium persulfate, styrene, butyl acrylate, methyl acrylate, a low-foam nonionic emulsifier, a zwitterionic emulsifier, a zwitterionic compound, a pH regulator and hydrogen peroxide. The method comprises the following steps: 1, stirring 30kg of deionized water and ammonium persulfate for later use; 2, stirring styrene, butyl acrylate, methyl acrylate, a low-foam nonionic emulsifier and a zwitterionic emulsifier for later use; 3, mixing 100 kg of deionized water with hydrogen peroxide for later use; 4, stirring the rest deionized water, adding the zwitterionic compound, heating, adding the standby material 1 and the standby material 2, and keeping the temperature for 30 minutes; 5, stirring and adding the material for later use 3 and the material for later use 4, and keeping the temperature for 30 minutes; and 6, cooling to 40 DEG C, adding a certain amount of pH regulator according to needs, and stirring for 15 minutes. The sizing agent can improve the performance of paper, and the charge property and the charge capacity can be regulated and controlled.

Description

[0001] The present invention relates to the technical field of papermaking auxiliaries, and particularly to a styrene-acrylic emulsion sizing agent for papermaking with adjustable charge property and charge amount. Background Art

[0002] Styrene-acrylic emulsion sizing agent is a synthetic sizing agent polymerized from main monomers such as styrene, butyl acrylate and methyl acrylate. It has good film-forming property, weather resistance and adhesiveness, and is widely used in the papermaking industry, which can improve the water resistance, scratch resistance and tensile strength of paper.

[0003] At present, there are various types of styrene-acrylic emulsions, and their physical properties and application performances are also different. According to the different charge properties, styrene-acrylic emulsion sizing agents are mainly divided into cationic type, anionic type and non-ionic type. Among them, cationic styrene-acrylic emulsion is positively charged. It can not only adsorb on the surface of negatively charged paper fibers to improve the paper properties, but also has the functions of dust prevention, sterilization and antistatic, so it has developed rapidly. However, the emulsifying ability of cationic emulsifiers is poor, and the difficulty and cost of preparing styrene-acrylic emulsion are high; the emulsifying abilities of anionic and non-ionic emulsifiers are strong, and the dosage of emulsifiers required for preparing styrene-acrylic emulsion is low. However, the lack of electrostatic attraction between negatively charged or uncharged styrene-acrylic emulsion and paper fibers affects the sizing effect. At the same time, the emulsifier components selected for styrene-acrylic emulsion sizing agents with different charge properties are different and the types are single, resulting in problems such as large emulsifier dosage, poor sizing effect, cumbersome formulation design and complex production process being widespread. Summary of the Invention

[0004] The purpose of the present invention is to solve the above technical defects and product problems, and provide a styrene-acrylic emulsion sizing agent with adjustable charge property and charge amount, and prepare styrene-acrylic emulsion sizing agents with different charge properties and charge amounts by using a composite emulsifier with the same components.

[0005] The technical solution adopted by the present invention is as follows: A styrene-acrylic emulsion sizing agent for papermaking with adjustable charge property and charge amount, characterized in that the raw material composition in weight percentage of the styrene-acrylic emulsion sizing agent for papermaking with adjustable charge property and charge amount is: styrene 10% - 15%, butyl acrylate 8% - 10%, methyl acrylate 3% - 5%, ammonium persulfate 0.1% - 0.3%, zwitterionic emulsifier 1% - 2%, low-foaming non-ionic emulsifier 3% - 5%, zwitterionic compound 1% - 2%, pH regulator 0.1% - 0.5%, hydrogen peroxide 0.1% - 0.3%, Kathon 0.1% - 0.3%, and deionized water as the balance.

[0006] The preparation steps of the styrene-acrylic emulsion sizing agent for papermaking with adjustable charge property and charge amount are as follows: (1) Stir 30 kg of deionized water and ammonium persulfate for later use; (2) Stir styrene, butyl acrylate, methyl acrylate, low-foaming nonionic emulsifier, and zwitterionic emulsifier for later use. (3) Mix 100 kg of deionized water with hydrogen peroxide for later use. (4) Stir and add the remaining deionized water to the zwitterionic compound. After heating, add the first batch of materials to be used and the second batch of materials to be used, and keep warm for 30 minutes. (5) Stir and add the third batch of materials to be used and the fourth batch of materials to be used, and keep warm for 30 minutes. (6) Cool down to 40 °C, add a certain amount of pH regulator as needed and stir for 15 minutes. (7) Filter out the insoluble matter to obtain the finished product.

[0007] In the above technical solution: the low-foaming nonionic emulsifier is one or a mixture of any proportions of block polyether L61, block polyether L64, isooctyl phosphate, fatty acid methyl ester ethoxylate, and preferably fatty acid methyl ester ethoxylate.

[0008] The zwitterionic emulsifier is one or a mixture of any proportions of cocamidopropyl betaine, coconut-based amphoteric imidazoline, and sodium lauryl aminopropionate, and preferably cocamidopropyl betaine.

[0009] The zwitterionic compound is one or a mixture of any proportions of betaine and amino acid, and preferably betaine.

[0010] The pH regulator is one of ammonia water, triethylamine, citric acid, and acetic acid, and preferably ammonia water or citric acid.

[0011] The advantages and effects of the present invention are as follows: This technical solution uses a scientific compounding technology to obtain a styrene-acrylic emulsion sizing agent with the same emulsifier components but adjustable charge properties and charge amounts. It can not only improve the properties of paper such as water resistance, scratch resistance, and tensile strength, but also make the formulation design process and production process flow simpler, and the prepared styrene-acrylic emulsion sizing agent has excellent properties. Specific Embodiments Example 1

[0012] Formula (total amount is 1 ton): 100 kg of styrene, 80 kg of butyl acrylate, 30 kg of methyl acrylate, 2 kg of ammonium persulfate, 15 kg of cocamidopropyl betaine, 30 kg of block polyether L61, 10 kg of betaine, 5 kg of ammonia water or citric acid, 1 kg of hydrogen peroxide, 1 kg of Kathon, and 736 kg of deionized water.

[0013] The preparation method is as follows: (1) Stir 30 kg of deionized water with 2 kg of ammonium persulfate for later use. (2) Stir 100 kg of styrene, 80 kg of butyl acrylate, 30 kg of methyl acrylate, 30 kg of block polyether L61, and 15 kg of cocamidopropyl betaine for later use; (3) Mix 100 kg of deionized water with 1 kg of hydrogen peroxide for later use; (4) Stir and add the remaining deionized water, heat up after adding 10 kg of betaine, then add the first batch of materials to be used and the second batch of materials to be used, and keep warm for 30 minutes; (5) Stir and add the third batch of materials to be used and the fourth batch of materials to be used, and keep warm for 30 minutes; (6) Cool down to 40 °C, add ammonia water or citric acid in an amount of 5 kg or less as needed and stir for 15 minutes; (7) Filter out the insoluble substances to obtain the finished product. Example 2

[0014] Formula (total amount is 1 ton): 110 kg of styrene, 60 kg of butyl acrylate, 50 kg of methyl acrylate, 3 kg of ammonium persulfate, 20 kg of cocamidopropyl betaine, 40 kg of fatty acid methyl ester ethoxylate, 12 kg of betaine, 8 kg of ammonia water or acetic acid, 2 kg of hydrogen peroxide, 1 kg of Kathon, 694 kg of deionized water.

[0015] The preparation method is as follows: (1) Stir 30 kg of deionized water with 3 kg of ammonium persulfate for later use; (2) Stir 110 kg of styrene, 60 kg of butyl acrylate, 50 kg of methyl acrylate, 40 kg of fatty acid methyl ester ethoxylate, and 20 kg of cocamidopropyl betaine for later use; (3) Mix 100 kg of deionized water with 2 kg of hydrogen peroxide for later use; (4) Stir and add the remaining deionized water, heat up after adding 12 kg of betaine, then add the first batch of materials to be used and the second batch of materials to be used, and keep warm for 30 minutes; (5) Stir and add the third batch of materials to be used and the fourth batch of materials to be used, and keep warm for 30 minutes; (6) Cool down to 40 °C, add ammonia water or acetic acid in an amount of 8 kg or less as needed and stir for 15 minutes; (7) Filter out the insoluble substances to obtain the finished product. Example 3

[0016] Formula (total amount is 1 ton): 100 kg of styrene, 90 kg of butyl acrylate, 50 kg of methyl acrylate, 2 kg of ammonium persulfate, 15 kg of cocoamphoimidazoline, 50 kg of fatty acid methyl ester ethoxylate, 10 kg of amino acid, 10 kg of triethylamine or citric acid, 1 kg of hydrogen peroxide, 1 kg of Kathon, 671 kg of deionized water.

[0017] The preparation method is as follows: (1)30 kg of deionized water and 2 kg of ammonium persulfate were stirred for later use; (2)100 kg of styrene, 90 kg of butyl acrylate, 50 kg of methyl acrylate, 50 kg of fatty acid methyl ester ethoxylate, and 15 kg of coconut oil-based amphoteric imidazoline were stirred for later use; (3)100 kg of deionized water and 1 kg of hydrogen peroxide were mixed for later use; (4)The remaining deionized water was stirred and added with 10 kg of amino acid. After heating, the first and second materials to be used were added, and it was kept warm for 30 minutes; (5)The third and fourth materials to be used were stirred and added, and it was kept warm for 30 minutes; (6)The temperature was lowered to 40 °C, and 10 kg or less of triethylamine or citric acid was added as needed and stirred for 15 minutes; (7)The insoluble substances were filtered out to obtain the finished product.

[0018] Effect experiment: The properties of the sizing agents prepared in Examples 1 to 3 are as follows: Charge property Average particle size Stability Dispersibility Example 1 Positive charge (5 kg of citric acid) <200 nm 6 months First grade Negative charge (5 kg of ammonia water) <200 nm 6 months First grade No charge (2.1 kg of ammonia water) <200 nm 6 months First grade Example 2 Positive charge (8 kg of acetic acid) <200 nm 6 months First grade Negative charge (8 kg of ammonia water) <200 nm 6 months First grade No charge (2.3 kg of ammonia water) <200 nm 6 months First grade Example 3 Positive charge (10 kg of citric acid) <200 nm 6 months First grade Negative charge (10 kg of triethylamine) <200 nm 6 months First grade No charge (3.4 kg of triethylamine) <200 nm 6 months First grade The results show that the styrene-acrylic emulsion sizing agent for papermaking of the present invention has the advantages of high stability, good dispersibility, and small average particle size. With the addition of the pH regulator, the pH of the emulsion changes continuously, and the styrene-acrylic emulsion sizing agent can show positive charge, negative charge, and no charge. At the same time, the amount of charge carried also changes with the change of the addition amount of the pH regulator.

[0019] The present invention is illustrated by the above examples, but it should not be understood that the scope of the above subject matter of the present invention is limited to the following examples. All technologies implemented based on the content of the present invention belong to the scope of the present invention.

Claims

1. A styrene-acrylic emulsion sizing agent for papermaking with adjustable charge property and charge amount, characterized in that: The weight percentage raw material composition of the styrene-acrylic emulsion sizing agent for papermaking with adjustable charge property and charge amount is as follows: styrene 10% - 15%, butyl acrylate 8% - 10%, methyl acrylate 3% - 5%, ammonium persulfate 0.1% - 0.3%, zwitterionic emulsifier 1% - 2%, low-foaming non-ionic emulsifier 3% - 5%, zwitterionic compound 1% - 2%, pH regulator 0.1% - 0.5%, hydrogen peroxide 0.1% - 0.3%, Kathon 0.1% - 0.3%, and deionized water as the balance.

2. The sizing agent for papermaking based on styrene-acrylic emulsion with adjustable charge property and charge amount according to claim 1, characterized in that: The preparation steps of the styrene-acrylic emulsion sizing agent for papermaking with adjustable charge property and charge amount are as follows: (1) Stir 30 kg of deionized water and ammonium persulfate for later use; (2) Stir styrene, butyl acrylate, methyl acrylate, low-foaming non-ionic emulsifier, and zwitterionic emulsifier for later use; (3) Mix 100 kg of deionized water and hydrogen peroxide for later use; (4) Stir and add the remaining deionized water, then add the zwitterionic compound. After heating, add the first batch of materials to be used and the second batch of materials to be used, and keep warm for 30 minutes; (5) Stir and add the third batch of materials to be used and the fourth batch of materials to be used, and keep warm for 30 minutes; (6) Cool down to 40 °C, add a certain amount of pH regulator as needed and stir for 15 minutes; (7) Filter out the insoluble substances to obtain the finished product.

3. A styrene-acrylic emulsion sizing agent for papermaking with adjustable charge property and charge amount according to claim 1 or 2, characterized in that: The low-foaming non-ionic emulsifier is one or a mixture of any proportions of block polyether L61, block polyether L64, isooctyl phosphate, and fatty acid methyl ester ethoxylate.

4. A styrene-acrylic emulsion sizing agent for papermaking with adjustable charge property and charge amount, according to claim 1 or 2, characterized in that: The zwitterionic emulsifier is one or a mixture of any proportions of cocamidopropyl betaine, coconut-based amphoteric imidazoline, and sodium dodecyl aminopropionate.

5. A styrene-acrylic emulsion sizing agent for papermaking with adjustable charge property and charge amount, characterized in that: The zwitterionic compound is one or a mixture of any proportions of betaine and amino acid.

6. A styrene-acrylic emulsion sizing agent for papermaking with adjustable charge property and charge amount, according to claim 1 or 2, characterized in that: The pH regulator is one of ammonia water, triethylamine, citric acid, and acetic acid.