CN102363937B

CN102363937B - Guar gum surface sizing agent and its preparation method

Info

Publication number: CN102363937B
Application number: CN201110183023.7A
Authority: CN
Inventors: 施晓旦; 李改霞; 王养臣
Original assignee: Shanghai Dongsheng New Material Co Ltd
Current assignee: Shanghai Changfa New Materials Co Ltd
Priority date: 2011-06-30
Filing date: 2011-06-30
Publication date: 2013-06-12
Anticipated expiration: 2031-06-30
Also published as: CN102363937A

Abstract

The invention discloses a guar gum surface sizing agent and its preparation method. The preparation method comprises the following steps of: (1) adding dropwisely an oxidant water solution into a solvent containing a guar gum raw powder, controlling the pH of the system within 2 to 4, and reacting to obtain oxidized guar gum; (2) adding a viscosity stabilizer into the product obtained from the step (1), simultaneously adjusting pH to 6-8, reacting, and collecting the guar gum surface sizing agent from the reaction product. By the adoption of the preparation method, the paper surface sizing agent provided by the invention can be used to reduce the finished paper fiber consumption, simplify the glue preparation technology, minimize labor intensity and raise the printing performance and printing strength for applying glue on the paper surface.

Description

A kind of guar surface sizing agent and preparation method thereof

Technical field

The present invention relates to a kind of preparation method of the guar surface sizing agent for paper.

Background technology

The kind of the Cypres that paper-making industry is used is a lot, source with chemicals can be divided into: natural polymer and synthetic high polymer Cypres, Cypres commonly used has: the natural polymer Cypres namely: cationic starch, anionic phosphate starch, oxyalkyl starch, dialdehyde starch, acetic acid esters starch, enzyme converted starch, acidified starch, animal glue, modified cellulose, alginate etc.; The synthetic high polymer Cypres has: polyvinyl alcohol (PVA), poly amic acid (PAM), polyurethane, AKD class etc.

at present, when producing two glue printing paper, most surface sizing techniques that use are that natural polymer Cypres and synthetic high polymer sizing agent is formulated by certain process ratio, as according to weight ratio being: cationic starch: polyvinyl alcohol (PVA): surface reinforcing agent (TSI)=78: 16: 10, the weight percent concentration of glue is 3-4%, the applying glue temperature is 50-80 ℃, the preparing process of this sizing agent is complicated, workload is large, at first to prepare cationic starch in disclosing at the glue that boils separately, polyvinyl alcohol glue, filtering through 80 purpose screens, then according to technological requirement, three kinds of glue are placed on one and join mixed preparing Cypres in the glue bucket, again be pumped in accumulator tank store standby, at last according to paper kind needs, on the paper sizing machine, paper is carried out the applying glue processing with pumping.The prepared existing artifical influence factor of glue agent of this adhesive-preparing technology is more; sizing material concentration is unstable; workman's manipulation strength is higher; during the page gluing; glue-spread is unstable; when paper prints in the printing house, often the phenomenons such as hair, dry linting can occur falling, the surface printing intensity of paper is relatively poor.

Summary of the invention

The objective of the invention is to disclose a kind of guar surface sizing agent and preparation method thereof, the defects that exists to overcome prior art.

The preparation method of guar surface sizing agent of the present invention comprises the steps:

(1) aqueous oxidizing agent solution is added dropwise to the solvent that contains the former powder of guar gum, time for adding is 20-45 minute, and temperature is 50-70 ℃, and after dropwising, adding hydrochloric acid or acetic acid hierarchy of control pH is 2-4, and reaction got oxidized guar after 2-5 hour;

(2) in the product of step (1), the viscosity stabiliser that adds guar gum oven dry weight 0.1-3%, regulating pH with NaOH simultaneously is 6-8, be warming up to 40-60 ℃, reaction 1-3 hour, make guar gum obtain crosslinked and esterification, then collect described guar surface sizing agent from product;

Described solvent is ethanol, methyl alcohol, isopropyl alcohol or propyl alcohol etc., preferred alcohol and isopropyl alcohol, and the weight ratio of solvent and guar gum is 1～2: 1;

Viscosity when the former powder of described guar gum is 25 ℃ of weight concentration 1% solution is less than 5000 former powder;

Described oxidant is peroxosulphuric or Peracetic acid, and the weight concentration of aqueous oxidizing agent solution is 30～40%, and the weight of described oxidant is the 0.3-0.7% of the former powder of guar gum;

Described viscosity stabiliser is the mixture of vinylacetate and succinyl oxide, and its addition is the 0.1-3% of the former grain weight amount of guar gum, and vinylacetate and succinyl oxide weight ratio are 1: 0.2～0.6.

Paper surface sizing agent provided by the invention can be lowered into the consumption of paper fiber, simplifies adhesive-preparing technology, reduces labour intensity, can improve the printing performance of paper for surface sizing and print intensity.

The specific embodiment

In embodiment, if no special instructions, the consumption of component is weight portion.

Embodiment 1

In the four-hole boiling flask that thermometer, mechanical agitation, logical nitrogen device and Dropping feeder are housed, add 200 parts of ethanol, open and stir, under agitation add 200 parts of guar gums, disperse to be warming up to 50 ℃ after 10 minutes, drip 10 parts of the 10wt% peroxosulphuric aqueous solution, time for adding is 20 minutes, after dropwising, reaction is 5 hours at this temperature, adds weight concentration 20% hydrochloric acid, the pH of the hierarchy of control is 2.0, is cooled to room temperature and gets oxidized guar;

Add 0.5 part of vinylacetate and 0.1 part of succinyl oxide in above-mentioned reaction system, and be the pH value to 8.0 of 30% sodium hydroxide solution regulator solution with weight concentration, be warming up to 40 ℃, reacted 1 hour, be cooled to 25 ℃, suction filtration, washing, drying, product of the present invention sieves to get;

Embodiment 2

In the four-hole boiling flask that thermometer, mechanical agitation, logical nitrogen device and Dropping feeder are housed, add 300 parts of ethanol, open and stir, under agitation add 200 parts of guar gums, disperse after 10 minutes, be warming up to 60 ℃, drip 12 parts of 10wt% peracetic acid solns, time for adding is 30 minutes, after dropwising, reaction is 3 hours at this temperature, and the pH that adds acetic acid to control the course of reaction system is 3.0, is cooled to room temperature and gets oxidized guar;

Add 0.65 part of vinylacetate and 0.35 part of succinyl oxide in above-mentioned reaction system, and be the p H value to 6.5 of 25% sodium hydroxide solution regulator solution with weight concentration, be warming up to 40 ℃, reacted 2 hours, be cooled to 25 ℃, suction filtration, washing, drying, product of the present invention sieves to get;

Embodiment 3

In the four-hole boiling flask that thermometer, mechanical agitation, logical nitrogen device and Dropping feeder are housed, add 400 parts of ethanol, open and stir, under agitation add 200 parts of guar gums, disperse after 5 minutes, be warming up to 70 ℃, drip 14 parts of 10% peracetic acid solns, time for adding is 45 minutes, after dropwising, reaction is 5 hours at this temperature, and the pH that adds acetic acid to control the course of reaction system is 4.0, is cooled to room temperature and gets oxidized guar;

Add 5 parts of vinylacetates and 1 part of succinyl oxide in above-mentioned reaction system, and with the pH value to 7.0 of the sodium hydroxide solution regulator solution of weight concentration 30%, be warming up to 50 ℃, reacted 1 hour, be cooled to 25 ℃, suction filtration, washing, drying, product of the present invention sieves to get;

Embodiment 4

(1) preparation of guar surface sizing agent glue:

With the product of the present invention of 20 parts, at room temperature be dispersed in 380 parts of water, after under agitation disperseing, under room temperature, dissolving is 1 hour, namely gets weight concentration and be 5% applying glue liquid; After crossing 80 order mesh screens, be pumped in storing container and store for future use;

(2) gluing condition:

Paper machine fabric width: 3150mm; Paper machine speed: 350m/min; Wet end furnish: softwood pulp 40%; Hardwood pulp 60%; Amount of filler: 20%; Resin application methods: size press; Upper gum concentration: 5%.

(3) effect:

Can find out from above experiment, product course of dissolution of the present invention is simple, compares with oxidized starch, and surface strength has larger raising.

Claims

1. the preparation method of a guar surface sizing agent, is characterized in that, comprises the steps:

(1) aqueous oxidizing agent solution is added dropwise to the solvent that contains the former powder of guar gum, hierarchy of control pH is 2-4, and reaction gets oxidized guar;

(2) in the product of step (1), add viscosity stabiliser, regulating simultaneously pH is 6-8, and then reaction collects described guar surface sizing agent from product;

In step (2), in the product of step (1), add the viscosity stabiliser of guar gum oven dry weight 0.1-3%, adding simultaneously NaOH to regulate pH is 6-8, is warming up to 40-60 ℃, reaction 1-3 hour;

Described viscosity stabiliser is the mixture of vinylacetate and succinyl oxide, and its addition is the 0.1-3% of the former grain weight amount of guar gum, and vinylacetate and succinyl oxide weight ratio are 1:0.2～0.6.

2. method according to claim 1, it is characterized in that, in step (1), aqueous oxidizing agent solution is added dropwise to the solvent that contains the former powder of guar gum, time for adding is 20-45 minute, and temperature is 50-70 ℃, after dropwising, adding hydrochloric acid or acetic acid hierarchy of control pH is 2-4, and reaction is after 2-5 hour.

3. method according to claim 2, is characterized in that, described solvent is ethanol, methyl alcohol, isopropyl alcohol or propyl alcohol, and the weight ratio of solvent and guar gum is 1～2:1.

4. method according to claim 2, is characterized in that, described oxidant is peroxosulphuric or Peracetic acid, and the weight concentration of aqueous oxidizing agent solution is 30～40%, and the weight of described oxidant is the 0.3-0.7% of the former powder of guar gum.

5. the guar surface sizing agent of according to claim 1～4 described methods of any one preparations.