Anion dispersed rosin size as well as raw material composition, preparation method and application thereof

Abstract

The invention discloses anionic dispersed rosin size, a raw material composition thereof, a preparation method and application thereof. The anionic dispersed rosin size comprises the following raw materials in parts by weight: 100-200 parts of rosin, 5-20 parts of a modifier, 8-30 parts of a low-molecular emulsifier, 40-80 parts of a high-molecular emulsifier and 2-8 parts of a dispersant. The anionic dispersed rosin size is prepared by emulsifying a modified rosin liquid, a low-molecular emulsifier and a high-molecular emulsifier by using a high-temperature normal-pressure phase inversion method.

Description

Technical Field

[0001] The invention belongs to the technical field of papermaking chemicals, and in particular relates to an anionic dispersed rosin glue, a raw material composition thereof, and a preparation method and application thereof. Background Art

[0002] Sizing is an important process in papermaking. Among the numerous paper sizing agents, rosin sizing agents are dominant, accounting for more than 2 / 3 of the total sizing amount. Rosin sizing agents include saponified rosin sizing, reinforced rosin sizing and dispersed rosin sizing. Among them, the sizing rate of dispersed rosin sizing is 4 times that of saponified rosin sizing and 2 times that of reinforced rosin sizing. Dispersed rosin sizing can improve the quality of paper and reduce the amount of aluminum sulfate and brightener.

[0003] The traditional anionic dispersed rosin size sizing method is to use rosin size and aluminum sulfate at a pH of 4 to 5, which is the so-called acid sizing. The aluminum sulfate used in acid sizing will accelerate the decomposition of cellulose, resulting in deterioration of paper quality and poor durability.

[0004] In the prior art, cationic rosin glue is used as a neutral sizing agent through a high temperature and high pressure homogenization method. However, the neutral sizing agent prepared by this method has a high organic chlorine content, relies on high temperature and high pressure equipment, and has poor storage stability of the finished product and many foams that cause paper voids. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an anionic dispersed rosin glue, a raw material composition thereof, and a preparation method and application thereof.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] In one aspect, the present invention provides a raw material composition of anionic dispersed rosin glue, which comprises the following raw materials in parts by weight:

[0008] 100-200 parts of rosin, 5-20 parts of modifier, 8-30 parts of low molecular emulsifier, 40-80 parts of high molecular emulsifier and 2-8 parts of dispersant.

[0009] In some embodiments, the modifier is one of fumaric acid, maleic acid, and maleic anhydride;

[0010] In some embodiments, the raw materials of the low molecular weight emulsifier include, by weight: 30-60 parts of vinyl ether compounds, 4-8 parts of maleic anhydride and 2-8 parts of sodium bisulfite; wherein the vinyl ether compound is selected from one of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether and isomeric tridecanol polyoxyethylene ether;

[0011] In some embodiments, the raw materials of the polymer emulsifier include, by weight: 50-100 parts of styrene, 10-20 parts of butyl acrylate, 40-80 parts of methacrylic acid, 5-10 parts of maleic anhydride, 5-15 parts of molecular weight regulator and 5-10 parts of initiator.

[0012] In some embodiments, the dispersant is at least one of sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, and sodium lignin sulfonate;

[0013] In some embodiments, the molecular weight regulator is at least one of butyrate, aliphatic thiol, and 2,4-diphenyl-4-methyl-1-pentene;

[0014] In some embodiments, the initiator is one of ammonium persulfate, potassium persulfate, hydrogen peroxide, ammonium persulfate / sodium bisulfite, potassium persulfate / sodium bisulfite, hydrogen peroxide / tartaric acid, hydrogen peroxide / bleaching powder, ammonium persulfate / ferrous sulfate, and hydrogen peroxide / ferrous sulfate.

[0015] In some embodiments, the raw material composition of the anionic dispersed rosin glue further includes a defoaming agent; preferably, the weight proportion of the defoaming agent is 1 to 3 parts; more preferably, the defoaming agent is at least one of emulsified silicone oil, a high carbon alcohol complex, polyether, and polydimethylsiloxane.

[0016] In some embodiments, the raw material composition of the anionic dispersed rosin glue further includes water. The amount of water is added according to the conventional amount in the art, which is specifically determined according to the solid content of the product, and the water content is about 50-70%.

[0017] In some embodiments, the weight parts of the rosin is 200 parts;

[0018] In some embodiments, the weight portion of the modifier is 15 parts;

[0019] In some embodiments, the weight portion of the low molecular weight emulsifier is 20 parts;

[0020] In some embodiments, the weight portion of the polymer emulsifier is 50 parts;

[0021] In some embodiments, the weight percentage of the dispersant is 5 parts.

[0022] In another aspect, the present invention provides a method for preparing anionic dispersed rosin glue, wherein the raw materials of the anionic dispersed rosin glue include the raw material composition of the anionic dispersed rosin glue, and specifically comprises the following steps:

[0023] (1) reacting rosin and a modifier at 180-200° C. for 1-3 hours to obtain modified rosin;

[0024] (2) heating the dispersant, the polymer emulsifier, and the low molecular weight emulsifier to a temperature of 60 to 90° C., and sequentially dropping them into the molten modified rosin for pre-emulsification at a shear rate of 400 to 1200 rpm to obtain a pre-emulsified rosin solution; wherein the polymer emulsifier is added for 15 min, and the low molecular weight emulsifier is added for 10 min;

[0025] (3) Slowly dripping 90-95° C. water into the pre-emulsified rosin solution and cooling the solution to obtain the anionic dispersed rosin glue.

[0026] In step (2), the preparation method of the low molecular weight emulsifier comprises: subjecting a vinyl ether compound to an addition reaction with maleic anhydride at 80 to 100° C. for 2 to 4 hours to obtain an addition product; and subjecting the addition product to a reaction with water and sodium bisulfite at 40 to 50° C. for 2 to 4 hours to obtain the low molecular weight emulsifier;

[0027] In step (2), the preparation method of the polymer emulsifier comprises: heating styrene, butyl acrylate, methacrylic acid, maleic anhydride, water, and a molecular weight regulator to 80 to 90° C., and adding an initiator dropwise for 1 to 3 hours to obtain the polymer emulsifier, wherein the initiator is added in the form of an aqueous solution;

[0028] In step (3), the cooling further includes adding a defoaming agent and adjusting the solid content.

[0029] The third aspect of the present invention provides anionic dispersed rosin glue, which is prepared by the preparation method of anionic dispersed rosin glue as described above.

[0030] In some embodiments, the solid content of the anionic dispersed rosin glue is 30% to 50%, and the viscosity is 15 to 50 mPa.s.

[0031] The fourth aspect of the present invention provides the use of anionic dispersed rosin size in papermaking.

[0032] The beneficial effects of the present invention are:

[0033] 1. This application adopts high and low molecular weight emulsifiers to prepare anionic rosin glue through phase inversion method. The product has narrow particle size distribution, high free rosin content, low viscosity, high whiteness and better stability.

[0034] 2. The product of this application is easily dispersed in cold water and can be more evenly dispersed in the slurry during the wet cloth addition process. The operation is simple and the original process does not need to be readjusted.

[0035] 3. This application can save the amount of rosin and aluminum sulfate, thereby reducing the cost of use, and can achieve maximum retention of dispersed rosin with the action of a small amount of retention aid.

[0036] 4. The product of the present application has less foam, does not cause fiber flocculation, and does not affect paper material forming. The anionic neutral rosin glue of the present invention can achieve acidic to neutral sizing, and its preparation process is simple and has low equipment requirements. When sizing, conventional retention system and sizing process are used, which can achieve the purpose of neutral sizing. DETAILED DESCRIPTION

[0037] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are selected according to conventional methods and conditions, or according to the product specifications. In addition, the reagents and raw materials used in the present invention are conventional commercial products unless otherwise specified.

[0038] Example 1

[0039] (1) Preparation of low molecular weight emulsifier: Weigh 40 g of alkylphenol polyoxyethylene ether and 6 g of maleic anhydride, heat to 90° C., react for 2 h, and then react the obtained addition product with 160 g of water and 2 g of sodium bisulfite at 50° C. for 4 h to obtain a low molecular weight emulsifier.

[0040] (2) Preparation of polymer emulsifier: 50 g styrene, 15 g butyl acrylate, 50 g methacrylic acid, 5 g maleic anhydride, 200 g water, 5 g butyrate, heat to 80°C, add initiator solution (50 g water, 5 g ammonium persulfate) dropwise to the monomer, and complete the addition within 1 hour.

[0041] (3) Rosin modification: Weigh 200 g of rosin and 6 g of maleic anhydride and modify at 200 °C for 2 h.

[0042] (4) Pre-emulsification: Heat 5 g of sodium tripolyphosphate, 20 g of low molecular weight emulsifier, and 50 g of high molecular weight emulsifier to 60°C, and slowly add them to the molten modified rosin over 20 minutes. Pre-emulsify thoroughly under stirring at 800 rpm.

[0043] (5) Phase inversion: 200 g of water at 90° C. was slowly dripped into the pre-emulsified rosin solution. As the hot water was added, the viscosity of the pre-emulsion decreased rapidly from a maximum value, and the oil-in-water emulsion was converted into an anionic rosin glue emulsion of oil-in-water. The pre-emulsion was cooled, and 1 g of an organosilicon defoamer was added. The solid content was adjusted to obtain an anionic dispersed rosin glue with a solid content of 40% and a viscosity of 20 mPa.s.

[0044] Example 2

[0045] (1) Preparation of low molecular weight emulsifier: Weigh 360 g of fatty alcohol polyoxyethylene ether AEO-3 and 4 g of maleic anhydride, heat to 90° C., react for 2 h, and then react the obtained addition product with 160 g of water and 3 g of sodium bisulfite at 50° C. for 4 h to obtain a low molecular weight emulsifier.

[0046] (2) Preparation of polymer emulsifier: 70 g styrene, 10 g butyl acrylate, 40 g methacrylic acid, 7 g maleic anhydride, 180 g water, 10 g thiol, heat to 80°C, add initiator solution (50 g water, 7 g ammonium persulfate) dropwise to the monomer, and complete the addition within 1 hour.

[0047] (3) Rosin modification: Weigh 200 g of rosin and 10 g of maleic anhydride and modify at 200 °C for 2 h.

[0048] (4) Pre-emulsification: Heat 4 g of sodium hexametaphosphate, 25 g of low molecular weight emulsifier, and 45 g of high molecular weight emulsifier to 90°C, and slowly add them to the molten modified rosin over 20 minutes. Pre-emulsify thoroughly under strong stirring at 1000 rpm.

[0049] (5) Phase inversion: 200 g of water at 95° C. was slowly dripped into the pre-emulsified rosin solution. As the hot water was added, the viscosity of the pre-emulsion decreased rapidly from a maximum value, and the oil-in-water emulsion was converted into an anionic rosin glue emulsion of oil-in-water. The pre-emulsion was cooled, and 1 g of a polyether defoamer was added. The solid content was adjusted to obtain an anionic dispersed rosin glue with a solid content of 30% and a viscosity of 30 mPa.s.

[0050] Example 3

[0051] (1) Preparation of low molecular weight emulsifier: Weigh 40 g of isomeric tridecanol polyoxyethylene ether and 8 g of maleic anhydride, heat to 90° C., react for 2 h, and then react the obtained addition product with 160 g of water and 8 g of sodium bisulfite at 50° C. for 4 h to obtain a low molecular weight emulsifier.

[0052] (2) Preparation of polymer emulsifier: 70 g of styrene, 20 g of butyl acrylate, 80 g of methacrylic acid, 10 g of maleic anhydride, 180 g of water, and 15 g of 2,4-diphenyl-4-methyl-1-pentene; heat to 80°C, and add initiator solution (50 g of water, 7 g of ammonium persulfate) dropwise to the monomers; the addition is completed within 1 hour.

[0053] (3) Rosin modification: Weigh 200 g of rosin and 15 g of maleic anhydride and modify at 200 °C for 2 h.

[0054] (4) Pre-emulsification: Heat 8 g of sodium methylene bisnaphthalene sulfonate, 30 g of low molecular weight emulsifier, and 70 g of high molecular weight emulsifier to 60°C, and slowly add them to the molten modified rosin within 20 minutes. Pre-emulsify the mixture under strong stirring at 400 rpm.

[0055] (5) Phase inversion: 200 g of water at 95° C. was slowly dripped into the pre-emulsified rosin solution. As the hot water was added, the viscosity of the pre-emulsion decreased rapidly from a maximum value, and the oil-in-water emulsion was converted into an anionic rosin glue emulsion of oil-in-water. The pre-emulsion was cooled, and 1 g of a higher alcohol defoamer was added. The solid content was adjusted to obtain an anionic dispersed rosin glue with a solid content of 40% and a viscosity of 18 mPa.s.

[0056] Example 4

[0057] (1) Preparation of low molecular weight emulsifier: Weigh 30 g of alkylphenol polyoxyethylene ether and 6 g of maleic anhydride, heat to 80°C, react for 3 h, and then react the obtained addition product with 160 g of water and 2 g of sodium bisulfite at 40°C for 3 h to obtain a low molecular weight emulsifier.

[0058] (2) Preparation of polymer emulsifier: 100 g styrene, 15 g butyl acrylate, 50 g methacrylic acid, 5 g maleic anhydride, 200 g water, 5 g butyrate, heat to 85°C, add initiator solution (50 g water, 10 g ammonium persulfate) dropwise to the monomer, and complete the addition within 3 hours.

[0059] (3) Rosin modification: Weigh 100 g of rosin and 5 g of maleic anhydride and modify at 180 °C for 3 h.

[0060] (4) Pre-emulsification: Heat 2 g of sodium tripolyphosphate, 8 g of low molecular weight emulsifier, and 40 g of high molecular weight emulsifier to 75°C, and slowly add them to the molten modified rosin over 20 min. Pre-emulsify thoroughly under stirring at 1200 rpm.

[0061] (5) Phase inversion: 200 g of water at 92° C. was slowly dripped into the pre-emulsified rosin solution. As the hot water was added, the viscosity of the pre-emulsion decreased rapidly from a maximum value, and the oil-in-water emulsion was converted into an anionic rosin glue emulsion of oil-in-water. The pre-emulsion was cooled, and 2 g of an organosilicon defoamer was added. The solid content was adjusted to obtain an anionic dispersed rosin glue with a solid content of 45% and a viscosity of 20 mPa.s.

[0062] Example 5

[0063] (1) Preparation of low molecular weight emulsifier: Weigh 40 g of alkylphenol polyoxyethylene ether and 6 g of maleic anhydride, heat to 100° C., react for 4 h, and then react the obtained addition product with 160 g of water and 2 g of sodium bisulfite at 45° C. for 2 h to obtain a low molecular weight emulsifier.

[0064] (2) Preparation of polymer emulsifier: 50 g styrene, 15 g butyl acrylate, 50 g methacrylic acid, 5 g maleic anhydride, 200 g water, 5 g butyrate, heat to 90°C, add initiator solution (50 g water, 5 g ammonium persulfate) dropwise to the monomer, and complete the addition within 2 h.

[0065] (3) Rosin modification: Weigh 150 g of rosin and 20 g of maleic anhydride and modify at 190 °C for 1 h.

[0066] (4) Pre-emulsification: Heat 5 g of sodium tripolyphosphate, 30 g of low molecular weight emulsifier and 80 g of high molecular weight emulsifier to 60°C, and slowly add them to the molten modified rosin over 20 minutes. Pre-emulsify thoroughly under stirring at 800 rpm.

[0067] (5) Phase inversion: 200 g of water at 90° C. was slowly dripped into the pre-emulsified rosin solution. As the hot water was added, the viscosity of the pre-emulsion decreased rapidly from a maximum value, and the oil-in-water emulsion was converted into an anionic rosin glue emulsion of oil-in-water. The pre-emulsion was cooled, and 3 g of an organosilicon defoamer was added. The solid content was adjusted to obtain an anionic dispersed rosin glue with a solid content of 40% and a viscosity of 15 mPa.s.

[0068] Comparative Example 1

[0069] The commercially available rosin glue is model NS-801 produced by Arakawa Chemical Industries, Ltd. of Japan.

[0070] Comparative Example 2

[0071] The only difference from Example 1 is that the molecular weight regulator butyrate is not added in step (2).

[0072] (1) Preparation of low molecular weight emulsifier: Weigh 40 g of alkylphenol polyoxyethylene ether and 6 g of maleic anhydride, heat to 90° C., react for 2 h, and then react the obtained addition product with 160 g of water and 2 g of sodium bisulfite at 50° C. for 4 h to obtain a low molecular weight emulsifier.

[0073] (2) Preparation of polymer emulsifier: 50 g of styrene, 15 g of butyl acrylate, 50 g of methacrylic acid, 5 g of maleic anhydride, and 200 g of water; heat to 80°C; and dropwise add initiator solution (50 g of water, 5 g of ammonium persulfate) into the monomers; the addition takes 1 hour.

[0074] (3) Rosin modification: Weigh 200 g of rosin and 6 g of maleic anhydride and modify at 200 °C for 2 h.

[0075] (4) Pre-emulsification: Heat 5 g of sodium tripolyphosphate, 20 g of low molecular weight emulsifier, and 50 g of high molecular weight emulsifier to 60°C, and slowly add them to the molten modified rosin over 20 minutes. Pre-emulsify thoroughly under stirring at 800 rpm.

[0076] (5) Phase inversion: 200 g of water at 90°C was slowly dripped into the pre-emulsified rosin solution. As the hot water was added, the viscosity of the pre-emulsion increased, but the phase inversion process could not be completed, and a uniform emulsion could not be obtained.

[0077] Comparative Example 3

[0078] The only difference from Example 1 is that after sodium bisulfite is added in step (1), the reaction is carried out at 50° C. for 1 h.

[0079] (1) Preparation of low molecular weight emulsifier: Weigh 40 g of alkylphenol polyoxyethylene ether and 6 g of maleic anhydride, heat to 90° C., react for 2 h, and then react the obtained addition product with 160 g of water and 2 g of sodium bisulfite at 50° C. for 1 h to obtain a low molecular weight emulsifier.

[0080] (2) Preparation of polymer emulsifier: 50 g styrene, 15 g butyl acrylate, 50 g methacrylic acid, 5 g maleic anhydride, 200 g water, 5 g butyrate, heat to 80°C, add initiator solution (50 g water, 5 g ammonium persulfate) dropwise to the monomer, and complete the addition within 1 hour.

[0081] (3) Rosin modification: Weigh 200 g of rosin and 6 g of maleic anhydride and modify at 200 °C for 2 h.

[0082] (4) Pre-emulsification: Heat 5 g of sodium tripolyphosphate, 20 g of low molecular weight emulsifier, and 50 g of high molecular weight emulsifier to 60°C, and slowly add them to the molten modified rosin over 20 minutes. Pre-emulsify thoroughly under stirring at 800 rpm.

[0083] (5) Phase inversion: 200 g of water at 90°C was slowly dripped into the pre-emulsified rosin solution. As the hot water was added, the viscosity of the pre-emulsion increased, but the phase inversion process could not be completed, and a uniform emulsion could not be obtained.

[0084] Comparative Example 4

[0085] The only difference from Example 1 is that the reaction temperature in step (2) is 60°C.

[0086] (1) Preparation of low molecular weight emulsifier: Weigh 40 g of alkylphenol polyoxyethylene ether and 6 g of maleic anhydride, heat to 90° C., react for 2 h, and then react the obtained addition product with 160 g of water and 2 g of sodium bisulfite at 50° C. for 4 h to obtain a low molecular weight emulsifier.

[0087] (2) Preparation of polymer emulsifier: 50 g styrene, 15 g butyl acrylate, 50 g methacrylic acid, 5 g maleic anhydride, 200 g water, 5 g butyrate, heat to 60°C, add initiator solution (50 g water, 5 g ammonium persulfate) dropwise to the monomer, and complete the addition within 1 hour.

[0088] (3) Rosin modification: Weigh 200 g of rosin and 6 g of maleic anhydride and modify at 200 °C for 2 h.

[0089] (4) Pre-emulsification: Heat 5 g of sodium tripolyphosphate, 20 g of low molecular weight emulsifier, and 50 g of high molecular weight emulsifier to 60°C, and slowly add them to the molten modified rosin over 20 minutes. Pre-emulsify thoroughly under stirring at 800 rpm.

[0090] (5) Phase inversion: 200 g of water at 90°C was slowly dripped into the pre-emulsified rosin solution. As the hot water was added, the viscosity of the pre-emulsion increased from a maximum value to a minimum value, but the phase inversion process could not be completed, and a uniform emulsion could not be obtained.

[0091] Comparative Example 5

[0092] The only difference from Example 1 is that the amount of raw polymer emulsification in step (4) is different, which is 30 g.

[0093] (1) Preparation of low molecular weight emulsifier: Weigh 40 g of alkylphenol polyoxyethylene ether and 6 g of maleic anhydride, heat to 90° C., react for 2 h, and then react the obtained addition product with 160 g of water and 2 g of sodium bisulfite at 50° C. for 4 h to obtain a low molecular weight emulsifier.

[0094] (2) Preparation of polymer emulsifier: 50 g styrene, 15 g butyl acrylate, 50 g methacrylic acid, 5 g maleic anhydride, 200 g water, 5 g butyrate, heat to 80°C, add initiator solution (50 g water, 5 g ammonium persulfate) dropwise to the monomer, and complete the addition within 1 hour.

[0095] (3) Rosin modification: Weigh 200 g of rosin and 6 g of maleic anhydride and modify at 200 °C for 2 h.

[0096] (4) Pre-emulsification: Heat 5 g of sodium tripolyphosphate, 20 g of low molecular weight emulsifier and 30 g of high molecular weight emulsifier to 60°C, and slowly add them to the molten modified rosin over 20 minutes. Pre-emulsify the mixture under stirring at 800 rpm.

[0097] (5) Phase transition: 200g of water at 90°C was slowly dripped into the pre-emulsified rosin solution. As the hot water was added, the viscosity of the pre-emulsion decreased rapidly from a maximum value, and the oil-in-water emulsion was transformed into an anionic rosin glue emulsion of water-in-oil. After cooling, 1g of silicone defoamer was added, and the solid content was adjusted to obtain an anionic dispersed rosin glue with a solid content of 40% and a viscosity of 60mPa.s. The finished product had poor stability and had obvious precipitation at the bottom after being placed for about 3 days.

[0098] Effect Example

[0099] 1. Solid content determination: Weigh 2g of sample, put it in a 150℃ oven, and detect the proportion of remaining substance after 30 minutes.

[0100] 2. Viscosity measurement: Viscosity was measured using a LVDV2T rotational viscometer produced by Brookfield (manufacturer), using a 1# rotor at a rotation speed of 60 rpm.

[0101] 3. Particle size determination: The particle size was determined by using a Malvern particle size analyzer, model Nano-ZS 90, produced by Derek (manufacturer).

[0102] 4. Chemical stability determination: Weigh 100 g of sample, add 10 g of 0.5 mol / L calcium chloride, stir for 10 min, and detect the residue on the 325 mesh filter.

[0103] 5. Mechanical stability test: Weigh 200g of sample and use a high-speed dispersion disc at a high shear speed of 5000rpm. Detect the residue on the 325-mesh filter for 30 minutes.

[0104] VI. Storage stability determination: observe the stratification at room temperature

[0105] 7. The comparison of water-resistant application effect is determined by the following method:

[0106] Experimental plan: Design and manufacture a paper with a basis weight of 100g / m 2

[0107] Process: pulp 85% + aluminum sulfate + rosin glue + talc 15% + CPAM (200ppm)

[0108] Rosin glue addition amount: 14kg / t paper, 18kg / t paper (wet / dry, each sample is added at 35% solid content.)

[0109] According to the above process, the pH value of the blank pulp is adjusted to about 6.0-7.0 with a dissolved 30% aluminum sulfate solution, and then the rosin glue prepared in Examples 1-5 or Comparative Examples 1-5 is added, and talcum powder is added after stirring for 1 minute, and a retention agent is added after stirring for 1 minute. After 1 minute, the prepared pulp is removed, and sheets are made with a 73-62 semi-automatic paper sheet former, and after being pressed with a 73-50 standard paper sheet press, the paper is dried with a glazing machine, and the 1-minute Cobb water absorption value of the paper sample is tested.

[0110] The performance of the samples of Examples 1 to 5 and Comparative Examples 1 to 5 was measured. The results are shown in Tables 1 and 2.

[0111] Table 1

[0112] sample Particle size / um Chemical stability / ppm Mechanical stability / ppm Stability / month Example 1 0.37 22 34 12 Example 2 0.42 25 28 12 Example 3 0.40 20 36 12 Example 4 0.43 38 93 12 Example 5 0.39 42 45 12 Comparative Example 1 0.57 70 120 6

[0113] Table 2

[0114]

[0115] It can be seen from the above results that the anionic dispersed rosin glue disclosed in the present invention, its raw material composition, preparation method and application thereof have better storage stability and more excellent use performance than the comparative example product.

[0116] Finally, it should be noted that in the present invention, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0117] Although the present disclosure has been disclosed above through the description of the specific embodiments of the present disclosure, it should be understood that those skilled in the art can design various modifications, improvements or equivalents to the present disclosure within the spirit and scope of the attached scheme. These modifications, improvements or equivalents should also be considered to be included in the scope of protection claimed by the present disclosure.

Claims

1. A raw material composition of anionic dispersed rosin glue, characterized in that: It contains the following raw materials in parts by weight: 100-200 parts of rosin, 5-20 parts of modifier, 8-30 parts of low molecular emulsifier, 40-80 parts of high molecular emulsifier and 2-8 parts of dispersant.

2. The raw material composition of anionic dispersed rosin glue according to claim 1, characterized in that: The modifier is one of fumaric acid, maleic acid and maleic anhydride; And / or, the raw materials of the low molecular weight emulsifier include, by weight: 30-60 parts of vinyl ether compounds, 4-8 parts of maleic anhydride and 2-8 parts of sodium bisulfite; wherein the vinyl ether compound is selected from one of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether and isomeric tridecanol polyoxyethylene ether; And / or, the raw materials of the polymer emulsifier include, by weight: 50-100 parts of styrene, 10-20 parts of butyl acrylate, 40-80 parts of methacrylic acid, 5-10 parts of maleic anhydride, 5-15 parts of molecular weight regulator and 5-10 parts of initiator; And / or, the dispersant is at least one of sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, and sodium lignin sulfonate.

3. The raw material composition of anionic dispersed rosin glue according to claim 2, characterized in that: The molecular weight regulator is at least one of butyrate, aliphatic mercaptan, and 2,4-diphenyl-4-methyl-1-pentene; And / or, the initiator is one of ammonium persulfate, potassium persulfate, hydrogen peroxide, ammonium persulfate / sodium bisulfite, potassium persulfate / sodium bisulfite, hydrogen peroxide / tartaric acid, hydrogen peroxide / bleaching powder, ammonium persulfate / ferrous sulfate, and hydrogen peroxide / ferrous sulfate.

4. The raw material composition of anionic dispersed rosin glue according to claim 1, characterized in that: The raw material composition of the anionic dispersed rosin glue further includes a defoamer; preferably, the weight portion of the defoamer is 1 to 3 parts; more preferably, the defoamer is at least one of emulsified silicone oil, a high-carbon alcohol complex, polyether, and polydimethylsiloxane.

5. The raw material composition of anionic dispersed rosin glue according to claim 1, characterized in that: The weight proportion of the rosin is 200 parts; And / or, the weight portion of the modifier is 15 parts; And / or, the weight portion of the low molecular weight emulsifier is 20 parts; And / or, the weight proportion of the polymer emulsifier is 50 parts; And / or, the weight proportion of the dispersant is 5 parts.

6. A method for preparing anionic dispersed rosin glue, characterized in that: The raw material of the anionic dispersed rosin glue comprises the raw material composition of the anionic dispersed rosin glue as claimed in any one of claims 1 to 5, and specifically comprises the following steps: (1) reacting rosin and a modifier at 180-200° C. for 1-3 hours to obtain modified rosin; (2) heating the dispersant, polymer emulsifier and low molecular weight emulsifier to a temperature of 60 to 90° C. and dropping them into the molten modified rosin for pre-emulsification, with the dropping time being 20 min and the shear speed being 400 to 1200 rpm to obtain a pre-emulsified rosin liquid; (3) Slowly dripping 90-95° C. water into the pre-emulsified rosin solution and cooling the solution to obtain the anionic dispersed rosin glue.

7. The method for preparing anionic dispersed rosin glue according to claim 6, characterized in that: The preparation method satisfies at least one of the following conditions: In step (2), the preparation method of the low molecular weight emulsifier comprises: subjecting a vinyl ether compound to an addition reaction with maleic anhydride at 80 to 100° C. for 2 to 4 hours to obtain an addition product; and subjecting the addition product to a reaction with water and sodium bisulfite at 40 to 50° C. for 2 to 4 hours to obtain the low molecular weight emulsifier; In step (2), the preparation method of the polymer emulsifier comprises: heating styrene, butyl acrylate, methacrylic acid, maleic anhydride, water, and a molecular weight regulator to 80 to 90° C., and adding an initiator dropwise for 1 to 3 hours to obtain the polymer emulsifier, wherein the initiator is added in the form of an aqueous solution; In step (3), the cooling further includes adding a defoaming agent and adjusting the solid content.

8. An anionic dispersed rosin glue, characterized in that: The anionic dispersed rosin glue is prepared by the preparation method of any one of claims 6 to 7.

9. The anionic dispersed rosin glue according to claim 8, characterized in that: The solid content of the anionic dispersed rosin glue is 30% to 50%, and the viscosity is 15 to 50 mPa.s.

10. Use of the anionic dispersed rosin size as claimed in claims 8 to 9 in papermaking.

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