CN104120627A - Sizing agent for papermaking and preparation method thereof - Google Patents

Abstract

The invention discloses a sizing agent for papermaking, which comprises the following components in percentage by weight: 11 to 13% of AKD, 2 to 4% of water-soluble cationic resin, 0.2 to 0.4% of stabilizer, 0.2 to 0.4% of enhancer, and 0.2 to 0.5% of sulfuric acid. The preparation method comprises the following steps: heating AKD in a melting kettle to a temperature of 70 to 80 DEG C so as to melt the AKD, saving the melt AKD for later use; adding deionized water, water-soluble cationic resin, a stabilizer and an enhancer into a preparation kettle, starting an emulsifying and dispersing machine; adding sulfuric acid to adjust the pH value to a range of 2 to 4; heating, when the temperature reaches 55 to 60 DEG C, adding the AKD into the preparation kettle, controlling the temperature in a range of 65 to 70 DEG C, carrying out emulsification for 15 to 20 minutes; further dispersing and emulsifying the emulsified AKD emulsion by a high-pressure homogenizer, cooling the AKD emulsion in a cooler, refluxing the AKD emulsion to a finished product kettle, and further cooling the AKD emulsion to a temperature of 30 DEG C so as to obtain the sizing agent for papermaking. The sizing agent has an improved sizing effect, and at the same time the using amount of sizing agent is reduced.

Description

A kind of emulsifying agent and preparation method thereof

[technical field]

The present invention relates to pulp technology for making paper, particularly relate to a kind of emulsifying agent and preparation method thereof.

[background technology]

In paper, between fiber, there are a large amount of pores, and the cellulose and the hemicellulose that form fiber contain hydrophilic hydroxyl and other hydrophilic radical, they can absorb water or other liquid, when writing or print with the paper of only being copied by fiber, ink or ink can be by infiltration, diffusions, cause the unclear or print through of writing, after paper water suction, intensity declines in addition, can affect the normal use of paper.Can be to meet its application requirements for making paper there is certain liquid-repellency, need in paper, add the film forming matter with liquid-repellency energy, this class material is exactly glue used in paper-making.

The kind of glue used in paper-making is a lot, as the alkyl ketene dimer (AKD) of gum rosin, Petropols glue, wax size and synthetic class, alkenyl succinic anhydride (ASA), styrene-acrylate class sizing agent etc.

Along with the development of paper industry, the application of New Products & New Technology, neutral sizing agent due to its wide pH value range of application,, whitewater closure little to the corrosivity of paper making equipment easily, copy paper water consumption is little, waste water is easily processed, become paper good endurance and non-yellowingly become fragile, can use calcium carbonate to do the advantages such as filler, has occupied leading position in paper industry.

AKD is a kind of unsaturated lactone, having can be directly and the lactonic ring functional group of cellulose hydroxyl reaction, generate irreversible ketone ester by reaction, and anchor on fiber, and hydrophobic alkyl outwardly, thereby make paper produce water repelling property, have the advantages that just because of this reactive characteristic and AKD sizing agent efficiency is high, consumption is few, effective, make AKD sizing agent become the neutral sizing agent of extensive use in papermaking.

But AKD is water insoluble, key prepared by sizing agent is to select suitable surfactant, AKD is prepared into the emulsion of good stability.AKD sizing agent can with surfactant have anionic, cationic, nonionic and modified starch, their effect is by AKD emulsification, is dispersed into particulate and water formation emulsion, and surfactant self has certain hydrophily, so unhelpful to applying glue, excessive use can affect sizing efficiency on the contrary.

[summary of the invention]

The object of this invention is to provide emulsifying agent that a kind of sizing efficiency is good, consumption is few and preparation method thereof.

The present invention is achieved through the following technical solutions above-mentioned purpose: a kind of emulsifying agent, the solid content of described emulsifying agent is 14-18%, described solid content comprises that mass percent is the water-soluble cationic resin of AKD, the 2-4% of 11-13%, the stabilizing agent of 0.2-0.4%, the hardening agent of 0.2-0.4%, the sulfuric acid of 0.2-0.5%, its preparation method, comprises the following steps:

Step 1: AKD is heated to 70-80 DEG C of thawing in thawing still for subsequent use;

Step 2: be equipped with high speed shear emulsion dispersion machine prepare still in add deionized water, water-soluble cationic resin, stabilizing agent and hardening agent, start described high speed shear emulsion dispersion machine;

Step 3: add sulfuric acid that pH value is adjusted to 2-4;

Step 4: heat, in the time that temperature arrives 55-60 DEG C, the described AKD in described thawing still is put into the described still of preparing, control temperature at 65-70 DEG C, high speed shear emulsification 15-20 minute;

Step 5: prepare AKD emulsion that in still, emulsification is good through high pressure homogenizer, the further emulsion dispersion of cooler, cooling by described, be back to finished product still, be further cooled to 30 DEG C and obtain emulsifying agent.

Compared with prior art, the beneficial effect of emulsifying agent of the present invention and preparation method thereof is: surfactant or modified starch used prepared sizing agent when replacing AKD emulsification with water-soluble cationic resin, contribute to sizing agent effect raising, reduce the consumption of sizing agent.

[detailed description of the invention]

Embodiment 1

A kind of emulsifying agent, its solid content is 14%, described solid content comprises that mass percent is the sulfuric acid that the concentration of 11% AKD, 2% water-soluble cationic resin, 0.4% aluminium polychloride, 0.4% oxychloride and 0.2% is 95%.Its preparation method, comprises the following steps:

Step 1: 11% AKD is heated to 70-80 DEG C of thawing in thawing still for subsequent use;

Step 2: be equipped with high speed shear emulsion dispersion machine prepare still in add deionized water, 2% water-soluble cationic resin, 0.4% oxychloride and 0.4% aluminium polychloride, start described high speed shear emulsion dispersion machine;

Step 3: add the sulfuric acid that 0.2% concentration is 95% that pH value is adjusted to 2-4;

Step 4: heat, in the time that temperature arrives 55-60 DEG C, the described AKD in described thawing still is put into the described still of preparing, control temperature at 65-70 DEG C, high speed shear emulsification 15-20 minute;

Step 5: prepare AKD emulsion that in still, emulsification is good through high pressure homogenizer, the further emulsion dispersion of cooler, cooling by described, be back to finished product still, being further cooled to 30 DEG C, to obtain solid content be 15% emulsifying agent.

Embodiment 2

A kind of emulsifying agent, its solid content is 16%, described solid content comprises that mass percent is the sulfuric acid that the concentration of 12.1% AKD, 3% water-soluble cationic resin, 0.3% aluminium polychloride, 0.2% oxychloride and 0.4% is 95%, and its preparation method, comprises the following steps:

Step 1: 12.1% AKD is heated to 70-80 DEG C of thawing in thawing still for subsequent use;

Step 2: be equipped with high speed shear emulsion dispersion machine prepare still in add deionized water, 3% water-soluble cationic resin, 0.3% oxychloride and 0.2% aluminium polychloride, start described high speed shear emulsion dispersion machine;

Step 3: add the sulfuric acid that 0.4% concentration is 95% that pH value is adjusted to 2-4;

Step 4: heat, in the time that temperature arrives 55-60 DEG C, the described AKD in described thawing still is put into the described still of preparing, control temperature at 65-70 DEG C, high speed shear emulsification 15-20 minute;

Step 5: prepare AKD emulsion that in still, emulsification is good through high pressure homogenizer, the further emulsion dispersion of cooler, cooling by described, be back to finished product still, being further cooled to 30 DEG C, to obtain solid content be 16.5% emulsifying agent.

Embodiment 3

A kind of emulsifying agent, its solid content is 18%, described solid content comprises that mass percent is the sulfuric acid that the concentration of 13% AKD, 4% water-soluble cationic resin, 0.2% aluminium polychloride, 0.3% oxychloride and 0.5% is 95%, and its preparation method, comprises the following steps:

Step 1: 13% AKD is heated to 70-80 DEG C of thawing in thawing still for subsequent use;

Step 2: be equipped with high speed shear emulsion dispersion machine prepare still in add deionized water, 4% water-soluble cationic resin, 0.2% oxychloride and 0.3% aluminium polychloride, start described high speed shear emulsion dispersion machine;

Step 3: add the sulfuric acid that 0.5% concentration is 95% that pH value is adjusted to 2-4;

Step 4: heat, in the time that temperature arrives 55-60 DEG C, the described AKD in described thawing still is put into the described still of preparing, control temperature at 65-70 DEG C, high speed shear emulsification 15-20 minute;

Step 5: prepare AKD emulsion that in still, emulsification is good through high pressure homogenizer, the further emulsion dispersion of cooler, cooling by described, be back to finished product still, being further cooled to 30 DEG C, to obtain solid content be 18% emulsifying agent.

Stabilizing agent in other embodiment also can replace oxychloride, and the hardening agent in other embodiment also can replace aluminium polychloride, and in other embodiment, also can to replace concentration be 95% sulfuric acid to the sulfuric acid of variable concentrations.

The present invention is by using water-soluble cationic resin, because its larger molecular chain length can be wrapped up AKD particulate, thereby form stable emulsion, the ionic of itself is easily combined with the fiber that is anion, under hot conditions, solidify and be attached on fiber, low-fiber water imbibition also can be fallen, thereby while replacing AKD emulsification, surfactant or modified starch used prepared AKD sizing agent, absorb under weight indicator reaching same paper surface, use this sizing agent than other like product consumption minimizing 9%.

Above-described is only some embodiments of the present invention.For the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.

Claims (8)

1. an emulsifying agent, it is characterized in that, the solid content of described emulsifying agent is 14-18%, and described solid content comprises that mass percent is the water-soluble cationic resin of AKD, the 2-4% of 11-13%, the stabilizing agent of 0.2-0.4%, the hardening agent of 0.2-0.4%, the sulfuric acid of 0.2-0.5%.

2. emulsifying agent according to claim 1, is characterized in that, the concentration of described sulfuric acid is 95%.

3. emulsifying agent according to claim 2, is characterized in that, described stabilizing agent is oxychloride.

4. emulsifying agent according to claim 3, is characterized in that, described hardening agent is aluminium polychloride.

5. emulsifying agent according to claim 4, it is characterized in that, the solid content of described emulsifying agent is 14%, and described solid content comprises that mass percent is the sulfuric acid that the concentration of 11% AKD, 2% water-soluble cationic resin, 0.4% aluminium polychloride, 0.4% oxychloride and 0.2% is 95%.

6. emulsifying agent according to claim 4, it is characterized in that, the solid content of described emulsifying agent is 16%, and described solid content comprises that mass percent is the sulfuric acid that the concentration of 12.1% AKD, 3% water-soluble cationic resin, 0.3% aluminium polychloride, 0.2% oxychloride and 0.4% is 95%.

7. emulsifying agent according to claim 4, it is characterized in that, the solid content of described emulsifying agent is 18%, and described solid content comprises that mass percent is the sulfuric acid that the concentration of 13% AKD, 4% water-soluble cationic resin, 0.2% aluminium polychloride, 0.3% oxychloride and 0.5% is 95%.

8. emulsifying agent as described in any one in claim 1-7 and preparation method thereof, is characterized in that, comprises the following steps:

Step 1: AKD is heated to 70-80 DEG C of thawing in thawing still for subsequent use;

Step 2: be equipped with high speed shear emulsion dispersion machine prepare still in add deionized water, water-soluble cationic resin, stabilizing agent and hardening agent, start described high speed shear emulsion dispersion machine;

Step 3: add sulfuric acid that pH value is adjusted to 2-4;

Step 4: heat, in the time that temperature arrives 55-60 DEG C, the described AKD in described thawing still is put into the described still of preparing, control temperature at 65-70 DEG C, high speed shear emulsification 15-20 minute;

Step 5: prepare AKD emulsion that in still, emulsification is good through high pressure homogenizer, the further emulsion dispersion of cooler, cooling by described, be back to finished product still, be further cooled to 30 DEG C and obtain emulsifying agent.