CN105113328A - Environmental-friendly sizing agent and preparation method therefor - Google Patents

Abstract

The present invention discloses an environmental-friendly sizing agent and a preparation method therefor. The environmental-friendly sizing agent comprises the following raw materials in parts by weight: 30-45 parts of tapioca starch, 760-820 parts of deionized water, 6-12 parts of epichlorhydrin, 4-8 parts of trimethylamine, 2-8 parts of potassium hydroxide, 80-120 parts of polypropylene resin, 2-4 parts of a calcium zinc compound stabilizer, 2-3 parts of glacial acetic acid, 2-4 parts of an emulsifier and 8-12 parts of a hydrophobic monomer. Compared to the prior art, the environmental-friendly sizing agent and the preparation method therefor disclosed by the present invention has advantages that environmental pollution caused by inorganic salt or organic solvents is effectively prevented by using a drying method to modify starch; the starch and an etherizing agent are fully mixed and react uniformly under vibration produced by ultrasonic waves, so that the etherification process is simplified, and shortcomings of a conventional drying method with respect to starch modification is overcome; cationic starch with the substituent degree of 0.3 is prepared, and therefore the environmental-friendly sizing agent with relatively high quality is produced.

Description

A kind of environment-friendly type sizing agent and preparation method thereof

Technical field

The invention belongs to carton package field of material technology, be specifically related to a kind of environment-friendly type sizing agent and preparation method thereof.

Background technology

From the development of paper industry, paper surface-sizing is one of indispensable process, can add by top sizing the surface additive that people improves page characteristic or increase Paper or cardboard WATER RESISTANCE.Along with new sizing agent do not stop explore, there is existing a lot of high-quality sizing agent at present, wherein important source material starch environmental pollution is little, development prospect is comparatively wide, in order to better utilize the character of starch, the important step in sizing agent production being processed into further to starch, wherein using cationic starch comparatively widely to have paste method, slurry processes, the production method such as solvent method and dry method.

Evenly, condition relaxes, but can only produce the lower cationic starch products of substitution value in slurry processes reaction, etherifying agent service efficiency is lower, needs to add a large amount of inorganic salts in production process, is difficult to be separated, produce a large amount of industrial wastewaters thus, cause serious environmental pollution.

Solvent method can use comparatively simple method to produce the cationic starch of high substituted degree, but its production process is complicated, uses a large amount of organic solvents, and solvent recovery process is poisoned comparatively large, easily produces more serious environmental pollution.

Dry method carries out modification when containing a small amount of water to starch, but due to moisture less, starch and etherifying agent can not be mixed, easily make starch local expanded, if adopted in the mixing of wet state, dry state response, can produce the cationic starch products that substitution value is higher, but complex process, is unfavorable for promoting.

Summary of the invention

The object of the invention is the problem easily causing environmental pollution for existing sizing agent production process, provide a kind of environment-friendly type sizing agent and preparation method thereof.

The present invention is achieved by the following technical solutions: a kind of environment-friendly type sizing agent, it is characterized in that, described environment-friendly type sizing agent material component is than as follows: tapioca 30-45 part, deionized water 760-820 part, epoxychloropropane 6-12 part, trimethylamine 4-8 part, potassium hydroxide 2-8 part, acrylic resin 80-120 part, calcium-zinc composite stabilizing agent 2-4 part, glacial acetic acid 2-3 part, emulsifying agent 2-4 part, hydrophobic monomer 8-12 part.

As further improvement of these options, described emulsifying agent is the one or more combination in dodecyl benzyl dimethyl ammonium chloride, hexadecyltrimethylammonium chloride and Dodecyl trimethyl ammonium chloride, and described hydrophobic monomer is vinyl trimethylsilane, trifluoroethyl methacrylate and methacrylic acid five one or more any combination in fluorine third fat.

As further improvement of these options, described potassium hydroxide solution concentration is 30-35%.

The preparation method of environment-friendly type sizing agent, concrete steps are as follows:

(1) epoxychloropropane and trimethylamine are put into reactor, pH value is adjusted to 6-8 by hydro-oxidation potassium, and 15-20 DEG C of reaction 1 hour, 40-45 DEG C was reacted two hours, obtain cationic etherifying agent;

(2) deionized water added in tapioca, stirs 1 hour with mixer, and cationic etherifying agent obtained in instillation (1), rises to 60-70 DEG C by temperature, reacts 20 minutes under hyperacoustic effect;

(3) in the reactor filling CATION etherification starch, acrylic resin is added, heat and be warming up to 70-80 DEG C, open high-speed shearing machine, shear rate is that 2000-2500 turns, shear 10-15 minute, then gained solution is crossed 150-200 order screen pack, inject high pressure 25-35MPa, continuous homogenizing twice in the homogenizer of low pressure 8-12MPa;

(4) in 1 part of calcium-zinc composite stabilizing agent, add the deionized water of 9 parts, stirring makes it mix, add glacial acetic acid adjustment solution pH value to 2-4, temperature is risen to 80-90 DEG C, add emulsifying agent and hydrophobic monomer again, stir, insulation reaction 3-4 hour, after reaction, the 40-50 DEG C of Temperature fall, obtains emulsion;

(5) add gained emulsion in step (4) by gained solution in step (3), maintain the temperature at 15-25 DEG C, stir and obtain sizing agent emulsion.

As further improvement of these options, described ultrasonic frequency vibratory is more than 20 KHzs, can produce hundreds thousand of vibrations per second.

The present invention has the following advantages compared to existing technology: adopt dry method to starch conversion, effectively avoid inorganic salts or organic solvent pollution on the environment, producing vibration by ultrasonic wave makes starch and etherifying agent fully mix, reaction evenly, simplify etherification procedure, overcome the deficiency of conventional dry to starch conversion, obtained substitution value is the cationic starch of 0.3, and then it is higher to produce quality, the sizing agent of environment-friendly type.

Detailed description of the invention

Embodiment

The forming steps of environment-friendly type sizing agent is as follows

(1) trimethylamine of the epoxychloropropane of 8 weight portions and 6 weight portions is put into reactor, pH value is adjusted to 6-8 by 4 parts, hydro-oxidation potassium, and 15-20 DEG C of reaction 1 hour, 40-45 DEG C was reacted two hours, obtain cationic etherifying agent.

(2) in the tapioca of 35 weight portions, add the deionized water of 175 parts, stir 1 hour with mixer, cationic etherifying agent obtained in instillation (1), rises to 60-70 DEG C by temperature, reacts 20 minutes under hyperacoustic effect.

(3) in the reactor filling CATION etherification starch, acrylic resin 95 parts is added, heat and be warming up to 70-80 DEG C, open high-speed shearing machine, shear rate is that 2000-2500 turns, shear 10-15 minute, then gained solution is crossed 200 order screen packs, inject high pressure 25-35MPa, continuous homogenizing twice in the homogenizer of low pressure 8-12MPa.

(4) in 4 parts of calcium-zinc composite stabilizing agents, add the deionized water of 660 parts, stirring makes it mix, add glacial acetic acid adjustment solution pH value to 2-4, temperature is risen to 80-90 DEG C, add the dodecyl benzyl dimethyl ammonium chloride of 3 weight portions and 4 parts of trifluoroethyl methacrylates and 6 parts of vinyl trimethylsilane again, stir, insulation reaction 3-4 hour, after reaction, the 40-50 DEG C of Temperature fall, obtains emulsion.

(5) add in gained solution in step (3) emulsion obtained in step (4), maintain the temperature at 15-25 DEG C, stir and obtain sizing agent emulsion.

The industrial wastewater produced in gained environment-friendly type sizing agent production process of the present invention is less, easily processes, after using in the paper machine, detects its technical indicator, compare as table 1 with AKD:

Index	Viscosity (25 DEG C of * MPa*S)	Applying glue scope pH value	Surface strength (cm/s)	Water imbibition (g/m2)	Number of times can be rolled over
						AKD	<30	7-9	49.8	30	20
Sizing agent of the present invention	<26	4-7	51.1	24	23

Table 1

Draw from table 1, in the present invention, environment-friendly type sizing agent is not except causing environmental pollution aborning, and sizing agent quality also improves, and has stronger commodity, more easily promotes.

Claims (5)

1. an environment-friendly type sizing agent, it is characterized in that, described environment-friendly type sizing agent material component is than as follows: tapioca 30-45 part, deionized water 760-820 part, epoxychloropropane 6-12 part, trimethylamine 4-8 part, potassium hydroxide 2-8 part, acrylic resin 80-120 part, calcium-zinc composite stabilizing agent 2-4 part, glacial acetic acid 2-3 part, emulsifying agent 2-4 part, hydrophobic monomer 8-12 part.

2. a kind of environment-friendly type sizing agent as claimed in claim 1, it is characterized in that, described emulsifying agent is the one or more combination in dodecyl benzyl dimethyl ammonium chloride, hexadecyltrimethylammonium chloride and Dodecyl trimethyl ammonium chloride, and described hydrophobic monomer is vinyl trimethylsilane, trifluoroethyl methacrylate and methacrylic acid five one or more any combination in fluorine third fat.

3. a kind of environment-friendly type sizing agent as claimed in claim 1, it is characterized in that, described potassium hydroxide solution concentration is 30-35%.

4. a preparation method for environment-friendly type sizing agent, is characterized in that, concrete steps are as follows:

(1) epoxychloropropane and trimethylamine are put into reactor, pH value is adjusted to 6-8 by hydro-oxidation potassium, and 15-20 DEG C of reaction 1 hour, 40-45 DEG C was reacted two hours, obtain cationic etherifying agent;

(2) deionized water added in tapioca, stirs 1 hour with mixer, and cationic etherifying agent obtained in instillation (1), rises to 60-70 DEG C by temperature, reacts 20 minutes under hyperacoustic effect;

(3) in the reactor filling CATION etherification starch, acrylic resin is added, heat and be warming up to 70-80 DEG C, open high-speed shearing machine, shear rate is that 2000-2500 turns, shear 10-15 minute, then gained solution is crossed 150-200 order screen pack, inject high pressure 25-35MPa, continuous homogenizing twice in the homogenizer of low pressure 8-12MPa;

(4) in 1 part of calcium-zinc composite stabilizing agent, add the deionized water of 9 parts, stirring makes it mix, add glacial acetic acid adjustment solution pH value to 2-4, temperature is risen to 80-90 DEG C, add emulsifying agent and hydrophobic monomer again, stir, insulation reaction 3-4 hour, after reaction, the 40-50 DEG C of Temperature fall, obtains emulsion;

(5) add gained emulsion in step (4) by gained solution in step (3), maintain the temperature at 15-25 DEG C, stir and obtain sizing agent emulsion.

5. the preparation method of a kind of environment-friendly type sizing agent as claimed in claim 4, it is characterized in that, described ultrasonic frequency vibratory is more than 20 KHzs, can produce hundreds thousand of vibrations per second.