CN102675515A

CN102675515A - Surface sizing agent and preparation method thereof

Info

Publication number: CN102675515A
Application number: CN201110422090XA
Authority: CN
Inventors: 王素青
Original assignee: LEPING QIKE CHEMICAL CO Ltd
Current assignee: LEPING QIKE CHEMICAL CO Ltd
Priority date: 2011-12-16
Filing date: 2011-12-16
Publication date: 2012-09-19

Abstract

The invention discloses a surface sizing agent for papermaking. At present, aids partially or completely use micromolecular emulsion, surfactant or water soluble polymer as a dispersing agent or an emulsifying agent, the combination speed of the molecules of the sizing agent and starch is relatively low, and after paper is sized and unloaded from a machine, the curing time is long. The method for preparing the surface sizing agent comprises the following steps of: 1) mixing a hydrophobic monomer, a hydrophilic monomer, a pH regular and an initiator, heating to 70 to 95 DEG C, reacting with stirring for 2 to 6 hours, and adding water, stirring and diluting to obtain an emulsion semi-finished product; and 2) adding a reduction initiator into the emulsion semi-finished product obtained by the reaction in the step 1), dripping an oxidization initiator and monomer simultaneously, wherein the reaction time is 70 to 95 DEG C, and reaction time is 2 to 4 hours, preserving heat for 2 to 4 hours, and adding water to adjust until the solid content is 31 percent to obtain a cation sizing aid. The sizing agent can greatly shorten the curing time in the sizing process, and obviously improve the water-resisting property of paper.

Description

A kind of Surface Size and preparation method thereof

Technical field:

The present invention is a kind of surface sizing agent for paper making and preparation method thereof.

Background technology:

In recent years, along with China's paper industry to modernization transformation, the industrial upgrading and the structural adjustment of domestic paper industry increasingly sharpen, paper machine speed improves constantly, paper quality requires strict more; Simultaneously; The use of non-wood pulps such as a large amount of straw pulps, paper waste; The interpolation of various fillers causes the decline of page surface strength and smoothness, has aggravated the phenomenons such as hair and powder dropping in the printing process; These have promoted the R and D of papermaking chemical products such as Surface Size greatly, particularly can improve the water resisting property of paper surface and the paper making additive of picking strength fast.

Cinnamic acrylic ester emulsion-type sizing agent adopts water as polymerisation medium, meets current requirements of green environmental protection.In recent years, the cinnamic acrylic ester emulsion sizing agent is developed gradually.This analog assistant of Chinese patent is all partly or entirely chosen small molecules emulsion agent, table second promoting agent or water-soluble polymers etc. basically as disperseing or emulsifying agent; Has certain wetting ability; The combination speed of sizing agent one's share of expenses for a joint undertaking and starch is relatively slow, and the curing time under the paper sizing behind the machine is longer; Glue sizing auxiliary agent and fiber molecule combine, and mainly depend on the effect of hydrogen bond, ionic linkage, the sizing efficiency less stable, and sizing efficiency is subject to factor affecting such as envrionment temperature, humidity.

Summary of the invention:

The purpose of this invention is to provide a kind of method of manufacture by vinylformic acid and the synthetic a kind of water-soluble cationic high molecular polymer of vinyl monomer copolymerization.

Technical problem to be solved by this invention is to overcome the defective that above-mentioned prior art exists; The Surface Size that provides a kind of emulsifying agent that obtains by hydrophobic monomer and hydrophilic monomer reaction to prepare; It has to react with fiber and constitutes the ability of covalent linkage; To shorten the curing time of applying glue process greatly, obviously improve the water resisting property and the surface strength of paper.

Its concrete preparation method is following steps:

1) with hydrophobic monomer, hydrophilic monomer, PH regulator and initiator mix, and are warming up to 70-95 ℃, stirring reaction 2-6 hour, add the water agitation and dilution at last and get the emulsion work in-process;

In the reaction system, each component ratio (weight) of raw material as follows:

Monomer 15-22% (ratio between hydrophilic monomer and the hydrophobic monomer is preferably 2: 1-1: between 3)

Solvent 8-80%

Initiator 0.1-2% (solvent preferably water, the preferred 30-75% of content)

PH regulator agent 1-10%

Wherein said hydrophobic monomer is the mixture of any or two kinds in vinylbenzene, alpha-methyl styrene, n-butyl acrylate, n-BMA, tert-butyl acrylate, the methylacrylic acid uncle butyl ester;

Wherein said hydrophilic monomer is: the mixture of any in vinylformic acid, acrylic amide, methacrylic dimethylaminoethyl, the propylene lignocaine ethyl ester or two kinds and dimethylamino-propyl USAF RH-1.

Wherein said pH regulator agent is a Glacial acetic acid min. 99.5, and concentrated hydrochloric acid or mass concentration are 35% aqueous sulfuric acid.

Wherein said initiator is that Potassium Persulphate, Sodium Persulfate, azo two isobutyls are fine, any one or two kinds of mixtures in the azo-bis-isobutyrate hydrochloride, azo diisopropylamidinateand azoles quinoline hydrochloride.

2) to 1) react adding reduction initiator in the emulsion work in-process that obtain, drip oxidation initiator and monomer afterwards simultaneously, temperature of reaction 70-95 ℃; Reaction times 2-4 hour; Be incubated 2-4 hour then, add water at last and be adjusted to solid content 31%, get the positively charged ion glue sizing auxiliary agent.

Wherein said monomer is the mixture of any or two kinds in vinylbenzene, alpha-methyl styrene, n-butyl acrylate, n-BMA, tert-butyl acrylate, the methylacrylic acid uncle butyl ester.

Wherein said reduction initiator is: bisulfite is received, any or two kinds of mixtures in the sodium sulphite, iron protochloride, ferrous sulfate.

Wherein said PH regulator is a Glacial acetic acid min. 99.5, and concentrated hydrochloric acid or mass concentration are 35% aqueous sulfuric acid.

Wherein said oxidation initiator is any one or the two kinds of mixtures in hydrogen peroxide, Potassium Persulphate, Sodium Persulfate, azo-bis-isobutyrate hydrochloride, the azo diisopropylamidinateand azoles quinoline hydrochloride.

Have following index through above two-step reaction products therefrom:

The present invention has the following advantages:

(1) the present invention is that cationic polymeric compound is as emulsifying agent; Mix use with surface sizing starch; Improve the binding ability of glue sizing auxiliary agent molecule and fiber molecule, accelerated the slaking speed and the sizing efficiency of paper sizing process, can satisfy the production requirement of high-speed paper machine.

(2) Surface Size of the present invention is cationic styrene-acrylic microemulsion, the surface strength that can improve paper with suppress hair and powder dropping, paper surface band trace positive charge after the applying glue can improve the absorptivity of paper printing ink.

(3) Surface Size of the present invention be water as solvent, can with the arbitrary proportion water compatible, be not easy to form settling at screen cloth or rod, also meet the current environment protection requirement of country simultaneously.

(4) Surface Size viscosity of the present invention is low, easy to operate, can be used for ivory board, white board, the surface treatment of paper such as fluting board and cultural paper.

Embodiment

Instance 1:

In the 500ml four-hole boiling flask that has condensing surface, Dropping feeder, whipping appts and TM, add 40g vinylbenzene, 15g dimethylamino-propyl USAF RH-1; 2g vinylformic acid, 10g acetic acid and 1g azo two isobutyls are fine, stir to heat up 80 ℃; Reacted 3 hours; Add 220g water then, continue to stir 1 hour, get the emulsion work in-process.

With 80g emulsion work in-process, 10g acetic acid and 0.1g ferrous sulfate add and have in the 500ml four-hole boiling flask of condensing surface, Dropping feeder, whipping appts and TM, stir; Be warming up to 70 ℃, drip 10g vinylbenzene simultaneously, the mixture of 13g n-BMA; With the azo diisopropylamidinateand azoles quinoline hydrochloride solution of 10g, 3 hours dropping time, be warming up to 95 ℃ of reactions 2 hours then; Add 20g cold water, cooling discharging, the Surface Size of solid content 30%.

Instance 2:

In the 500ml four-hole boiling flask that has condensing surface, Dropping feeder, whipping appts and TM, add 40g vinylbenzene, 5g methacrylic dimethylaminoethyl; 10g dimethylamino-propyl USAF RH-1, the aqueous sulfuric acid of 8g35% and 1g azo-bis-isobutyrate hydrochloride stir and heat up 70 ℃; Reacted 2 hours; Add 200g water then, continue to stir 2 hours, get the emulsion work in-process.

With 80g emulsion work in-process, 15g concentrated hydrochloric acid and 0.3g bisulfite are received to add and are had in the 500ml four-hole boiling flask of condensing surface, Dropping feeder, whipping appts and TM, stir; Be warming up to 70 ℃, drip 10g vinylbenzene simultaneously, the mixture of 13g tert-butyl acrylate; With the superoxol of 10g, 3 hours dropping time, be warming up to 90 ℃ of reactions 2 hours then; Cooling discharging, the Surface Size of solid content 31%.

Claims

1. the preparation method of a cation surface sizing agent is characterized in that: divide the reaction of two steps, step 1: with hydrophobic monomer; Hydrophilic monomer, pH regulator agent and initiator mix, and are warming up to 70-95 ℃; Stirring reaction 2-6 hour, add the water agitation and dilution at last and get the emulsion work in-process; Step 2: in the emulsion work in-process, add the reduction initiator, drip oxidation initiator and monomer simultaneously, temperature of reaction 70-95 ℃, reaction times 2-4 hour, be incubated 2-4 hour then, add water at last and be adjusted to solid content 31%, obtain cation surface sizing agent.

2. require the preparation method of described cation surface sizing agent according to right 1, it is characterized in that: the hydrophobic monomer described in the step 1 is the mixture of any or two kinds in vinylbenzene, alpha-methyl styrene, n-butyl acrylate, n-BMA, tert-butyl acrylate, the methylacrylic acid uncle butyl ester; Described hydrophilic monomer is: the mixture of any in vinylformic acid, acrylic amide, methacrylic dimethylaminoethyl, the propylene lignocaine ethyl ester or two kinds and dimethylamino-propyl USAF RH-1.

3. require the preparation method of described cation surface sizing agent according to right 1, it is characterized in that: the pH regulator agent described in the step 1 is an acetate, and concentrated hydrochloric acid or mass concentration are 35% aqueous sulfuric acid.

4. require the preparation method of described cation surface sizing agent according to right 1, it is characterized in that: the initiator described in the step 1 is that Potassium Persulphate, Sodium Persulfate, azo two isobutyls are fine, any one or two kinds of mixtures in the azo-bis-isobutyrate hydrochloride, azo diisopropylamidinateand azoles quinoline hydrochloride.

5. require the preparation method of described cation surface sizing agent according to right 1, it is characterized in that: the described monomer of step 2 is the mixture of any or two kinds in vinylbenzene, alpha-methyl styrene, n-butyl acrylate, n-BMA, tert-butyl acrylate, the methylacrylic acid uncle butyl ester.

6. require the preparation method of described cation surface sizing agent according to right 1, it is characterized in that: the described reduction initiator of step 2 is: bisulfite is received, any or two kinds of mixtures in the sodium sulphite, iron protochloride, ferrous sulfate; Described oxidation initiator is any one or the two kinds of mixtures in hydrogen peroxide, Potassium Persulphate, Sodium Persulfate, azo-bis-isobutyrate hydrochloride, the azo diisopropylamidinateand azoles quinoline hydrochloride.

7. the resulting cation surface sizing agent of the preparation method of a kind of cation surface sizing agent according to claim 1 and 2.

8. paper product is characterized in that using the described cation surface sizing agent of claim 7 to handle.