CN102363939B

CN102363939B - Guar gum surface sizing agent and preparation method thereof

Info

Publication number: CN102363939B
Application number: CN 201110183048
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: 2013-11-06
Anticipated expiration: 2031-06-30
Also published as: CN102363939A

Abstract

The invention provides a guar gum surface sizing agent and a preparation method thereof. The preparation method comprises the following steps of: (1) dropwise adding an oxidant aqueous solution into an organic solvent containing guar gum raw powder, controlling the pH of a system to 2-4 after dropwise adding, and reacting to obtain guar gum oxide; and (2) adding a viscosity stabilizer into the guar gum oxide obtained in the step (1) with the amount which is 0.1-3 percent based on the oven dry weight of guar gum, adjusting the pH of the system to 6-8, reacting, and collecting the guar gum surface sizing agent from a reaction product. Due to the adoption of a paper surface sizing agent, the consumption of papermaking fiber can be lowered, the glue making process is simplified, the labor intensity is lowered, and the printing performance and the printing strength of the paper surface sizing can be improved; and the guar gum surface sizing agent has the advantages of small impurity content and convenience for applying during preparation of a glue solution.

Description

Guar surface sizing agent and preparation method thereof

Technical field

The present invention relates to a kind of guar surface sizing agent and preparation method thereof.

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%, and 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, polyvinyl alcohol glue in disclosing at the glue that boils separately, 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 purpose of this invention is to provide a kind of guar surface sizing agent and preparation method thereof, the above-mentioned shortcoming 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 organic solvent that contains the former powder of guar gum, time for adding is 20-45 minute, and after dropwising, hierarchy of control p H is 2-4, and 50～70 ℃ were reacted 2-5 hour, and got oxidized guar;

The former powder of described guar gum is weight percentage 1% solution viscosity less than 5000 former powder;

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

Described oxidant is more than one in Peracetic acid, peroxosulphuric, peroxide phosphoric acid, organic peroxide acid or acid anhydrides, preferred peroxosulphuric or Peracetic acid, and its addition is the 0.1-1% of the former grain weight amount of guar gum;

The weight concentration of aqueous oxidizing agent solution is 20～30%;

(2) viscosity stabiliser is added the oxidized guar of step (1), addition is the 0.1-3% of guar gum oven dry weight, the p H that adds simultaneously the NaOH regulation system is 6-8, be warming up to 40-60 ℃, then reaction 1-3 hour collects described guar surface sizing agent from product;

Term " over dry " refers to not moisture.

Described viscosity stabiliser is more than one in vinylacetate, succinyl oxide, dicarboxylic acids half acid anhydride or sodium phosphate trimer;

The invention provides a kind of employing oxidized guar as paper surface sizing agent, reach and be lowered into the consumption of paper fiber, simplification adhesive-preparing technology, minimizing labour intensity, the printing performance that can improve paper for surface sizing and printing intensity purpose, product of the present invention is as Cypres, has preparation glue solution, impurity content is few, it is convenient to use, hair, dry linting problem have been solved in application, can be lowered into the consumption of paper fiber, simplify adhesive-preparing technology, reduce labour intensity, thereby improve printing performance and the printing intensity of paper surface.

The specific embodiment

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

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, with 10 parts of the peroxosulphuric aqueous solution of the 20wt% for preparing, be added dropwise in four-hole boiling flask, time for adding is 20 minutes, and after dropwising, reaction is 5 hours at this temperature, the pH of course of reaction system is 2.0, is cooled to room temperature and gets oxidized guar;

Add 0.5 part of vinylacetate in above-mentioned reaction system, and be the p H 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 to be warming up to 60 ℃ after 10 minutes, with 5 parts of the 25wt% peroxide acetate aqueous solutions that prepare, be added dropwise in four-hole boiling flask, time for adding is 30 minutes, and after dropwising, reaction is 3 hours at this temperature, the p H of course of reaction system is 3.0, is cooled to room temperature and gets oxidized guar;

Add 2 parts of sodium phosphate trimers in above-mentioned reaction system, and be the p H value to 6.5 of 20% 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 to be warming up to 70 ℃ after 5 minutes, with 15 parts of the 30wt% peroxide phosphoric acid solution that prepare, be added dropwise in four-hole boiling flask,, time for adding is 45 minutes, after dropwising, reaction is 5 hours at this temperature, and the p H of course of reaction system is 4.0, is cooled to room temperature and gets oxidized guar;

Add 5 parts of succinyl oxides in above-mentioned reaction system, and be the p H value to 7.0 of 30% sodium hydroxide solution regulator solution with weight concentration, 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

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:

Numbering	Sizing agent	Surface strength	Surface strength increase rate %	Degree of sizing g/m
					1	Blank	12	-----	21
1	Oxidized starch	14	16.7	22
					2	Embodiment 1	16	33.3	22
3	Embodiment 2	15	25	22
					4	Embodiment 3	15.7	30.8	22

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 guar surface sizing agent, is characterized in that, comprises the steps:

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

(2) viscosity stabiliser is added the oxidized guar of step (1), addition is the 0.1-3% of guar gum oven dry weight, and the pH of regulation system is 6-8 simultaneously, and then reaction collects described guar surface sizing agent from product;

In step (2), adding the pH of NaOH regulation system is 6-8, is warming up to 40-60 ℃, reaction 1-3 hour;

Described viscosity stabiliser is more than one in vinylacetate, succinyl oxide or sodium phosphate trimer.

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

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

4. method according to claim 3, is characterized in that, described oxidant is more than one in Peracetic acid, peroxosulphuric, peroxide phosphoric acid, organic peroxide acid or acid anhydrides, and its addition is the 0.1-1% of the former grain weight amount of guar gum.

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

6. the application of guar surface sizing agent according to claim 5, is characterized in that, is used for the top sizing of paper.