CN101225623B - Surface sizing agent for paper making - Google Patents

Abstract

The invention relates to a surface sizing agent for paper making, which has the material formula with a plurality of components and weight percentages as follows: starch 6.5-8%, styrene 4.5-6%, acrylonitrile 4-5%, n-butyl methacrylate 5.5-6.5, methacrylic acid iso-octyl 2-3.5, iso-octyl acrylate 0.4-1%, hydrogen peroxide 0.2-0.5%, formic acid0.5-1%, ferrous sulfate 0.5-4%, n-dodecyl mercaptan 0.5-3%, amylase 0-0.2% and water the rest, wherein at least one is chosen from n-butyl methacrylate, methacrylic acid iso-octyl and iso-octyl acrylate. The appearance of the surface sizing agent is slight yellow emulsion, and the main component is styrene-acrylic copolymer which is easily soluble at normal temperature. The surface sizing agent for paper making has the advantages of greatly increasing paper surface intensity, decreasing hair and powder shedding, and improving the sizing degree, smoothness and printability of paper.

Description

Surface sizing agent for paper making

Technical field

The invention belongs to the paper grade (stock) field of chemicals, be specifically related to a kind of surface sizing agent for paper making.

Background technology

Applying glue is meant in paper pulp or applies a kind of technology and the technology of sizing material on the paper, its objective is the DIMENSIONAL STABILITY that keeps paper, prevent to shrink, can reduce the water absorption of paper simultaneously and inhale quantity of ink, promote slickness, the printing adaptability of paper, thereby improve the quality of paper.The method of applying glue can be divided into plasm-glue-blending and top sizing.Method according to applying glue is classified, and sizing agent can be divided into internal sizing agent and Cypres, and wherein internal sizing agent is for the diffusion that prevents water quality liquid and infiltration and the chemical assistant that adds in paper pulp.Development along with paper industry, chemical industry, Cypres has become the principal mode that the page top sizing is handled, its effect not only is confined to give paper certain acid-resisting, in some cases, then emphasizes its improvement to paper printing characteristic, paper surface properties more.Therefore, top sizing is called surface modification or surface enhancing again.

The traditional Cypres of the general at present employing of China's paper industry, mainly contain two classes: the first kind is for using converted starch separately, as phosphate ester starch, oxidized starch; Second class is to add a certain proportion of polyvinyl alcohol or carboxymethyl cellulose in the converted starch.Traditional Cypres is poor to the affinity of fiber, cause the film that covers the page surface in dry run, to be easy to break with the continuous evaporation of moisture and the continuous contraction of rete, occur easily in the printing process fall the hair, the dry linting phenomenon, especially can not be fit to present high speed printing industry.

The synthetic surface sizing agent is a kind of multi-functional Cypres that has, and is formed with suitable ratio copolymerization by multiple activated monomer with various functions, and they are special in top sizing designs, and are the main products of present Cypres.This kind Cypres mainly can be divided into three types: (1), water-soluble polymer Cypres (SMA and SAA class); (2), aqueous polymer dispersion Cypres (SAE class); (3), polyurethane aqueous dispersion Cypres (PUD class).The synthetic surface sizing agent is higher more than 100 times than polyvinyl alcohol with the affinity of fiber.Compare degree of sizing, deflection, smoothness and the printing adaptability that can improve paper greatly with the conventional surface sizing agent.

In the U.S. Pat 5240771, the Cypres that acrylate, unsaturated acrylic acid or acid anhydrides, water-soluble monomer, other comonomer and polyvinyl alcohol emulsion polymerisation obtain is disclosed.Though the storage stability and the sizability of this Cypres are better, its chemical stability is lower, is easy to breakdown of emulsion under the organic solvent effect.

The paper grade (stock) synthetic surface sizing agent of other kind also exists in the market, mixes the shortcoming of intersolubility difference when using mutually, and the viscosity of paper production line integral body is uprised, the mobile variation of plain boiled water, thus influence is produced.

Summary of the invention

The invention provides a kind of surface sizing agent for paper making, its objective is to solve existing Cypres in the problem of mixing the intersolubility difference that can cause when using mutually.Problems such as mechanical stability, chemical stability and the foaminess of existing Cypres be low have been solved simultaneously.

For achieving the above object, the technical solution used in the present invention is: a kind of surface sizing agent for paper making, and composition of raw materials is made up of following composition and weight percentage:

Starch 6.5-8%;

Styrene 4.5-6%;

Acrylonitrile 4-5%;

N-BMA 5.5-6.5%;

EHMA 2-3.5%;

Isooctyl acrylate monomer 0.4-1%;

Hydrogen peroxide 0.2-0.5%;

Formic acid 0.5-1%;

Ferrous sulfate 0.5-4%;

N-dodecyl mercaptan 0.5-3%;

Amylase 0-0.2%;

Water surplus;

Wherein, n-BMA, EHMA and Isooctyl acrylate monomer are selected a kind of at least.

1, in the such scheme, described starch is converted starch.

2, in the such scheme, described diastatic effect is starch denaturalization, makes viscosity after the starch gelatinization less than 20cps, and when the raw material of Cypres directly used converted starch, amylase can no longer add.

Because the technique scheme utilization, the present invention compared with prior art has following advantage and effect:

1, the present invention can improve the quality of paper, and the paper of high-grade variety must just can reach the requirement of quality through the processing of Cypres.

2, Cypres of the present invention carries out top sizing when paper is coated with, and can effectively stop the infiltration of coating in page.

3, Cypres of the present invention is transferred to the surface interpolation by green end, thereby paper machine system is cleaned further, and is highly beneficial for the production process control and the cost savings of large-scale paper machine.Again because Cypres keeping near 100% on paper can be reduced the COD of paper machine white water.

4, the present invention improves the surface strength of paper greatly, reduces and falls hair, dry linting, can also improve degree of sizing, smoothness and the printability of paper.

The specific embodiment

Below in conjunction with embodiment the present invention is further described:

Embodiment one

Surface sizing agent for paper making, composition of raw materials is made up of following composition and weight percentage:

Converted starch 76Kg (7.6%), styrene 51.3Kg (5.13%), acrylonitrile 41Kg (4.1) %, n-BMA 57Kg (5.7%), EHMA 22Kg (2.2%), Isooctyl acrylate monomer 7Kg (0.7%), hydrogen peroxide 4Kg (0.4%), formic acid 6.6Kg (0.66%), ferrous sulfate 6.5Kg (0.65%), n-dodecyl mercaptan 7.2Kg (0.72%), water 722Kg, 1000Kg altogether.

Cypres is operated according to prior art in the preparation, and generally, the making of Cypres is made up of the following step:

The first step, feed intake: in first head tank, throw earlier Isooctyl acrylate monomer, n-BMA, EHMA, n-dodecyl mercaptan, styrene and acrylonitrile; In second head tank, throw water and hydrogen peroxide again.Two head tank materials stir after feeding intake.In reactor, add simultaneously entry and starch.

After second step, reactor are warming up to 70-95 ℃, be incubated one hour, simultaneously the material in the reactor stirred.The viscosity that insulation finishes material in the afterreaction still keeps less than 20cps.

The 3rd goes on foot, adds formic acid, ferrous sulfate and hydrogen peroxide in reactor.

The 4th goes on foot, the material in two head tanks is evenly dripped in reactor, and simultaneously, temperature of reaction kettle remains on 70-90 ℃.After adding, be cooled to room temperature after being incubated 1-2 hour again, add defoamer at last.

Embodiment two

Surface sizing agent for paper making, composition of raw materials is made up of following composition and weight percentage:

Starch 75Kg (7.5%), styrene 46.8Kg (4.68%), acrylonitrile 42.1Kg (4.21%), n-BMA 55.9Kg (5.59%), EHMA 23Kg (2.3%), Isooctyl acrylate monomer 5.86Kg (0.586%), hydrogen peroxide 4Kg (0.4%), formic acid 6.6Kg (0.66%), ferrous sulfate 7.5Kg (0.75%), n-dodecyl mercaptan 13.15Kg (1.315%), amylase 0.09Kg (0.009%), water 720Kg, 1000Kg altogether.The preparation reference example one of Cypres.

Embodiment three

Surface sizing agent for paper making, composition of raw materials is made up of following composition and weight percentage:

Starch 65.99Kg (6.599%), styrene 46Kg (4.6%), acrylonitrile 40Kg (4%), n-BMA 55Kg (5.5%), hydrogen peroxide 2Kg (0.2%), formic acid 6Kg (0.6%), ferrous sulfate 17Kg (1.7%), n-dodecyl mercaptan 6.5Kg (0.65%), amylase 0.01Kg (0.001%), water 757Kg, 1000Kg altogether.The preparation reference example one of Cypres.

Embodiment four

Surface sizing agent for paper making, composition of raw materials is made up of following composition and weight percentage:

Starch 74Kg (7.4%), styrene 56Kg (5.6%), acrylonitrile 48Kg (4.8%), n-BMA 61.97Kg (6.197%), EHMA 20Kg (2%), hydrogen peroxide 2Kg (0.2%), formic acid 8Kg (0.8%), ferrous sulfate 17Kg (1.7%), n-dodecyl mercaptan 8Kg (0.8%), amylase 0.03Kg (0.003%), water 705Kg, 1000Kg altogether.The preparation reference example one of Cypres.

Embodiment four

Surface sizing agent for paper making, the prescription of Cypres comprises following raw materials according:

Starch 71Kg (7.1%), styrene 56Kg (5.6%), acrylonitrile 48Kg (4.8%), EHMA 35Kg (3.5%), Isooctyl acrylate monomer 10Kg (1%), hydrogen peroxide 4Kg (0.4%), formic acid 8Kg (0.8%), ferrous sulfate 37Kg (3.7%), n-dodecyl mercaptan 15.9Kg (1.59%), amylase 0.1Kg (0.003%), water 715Kg, 1000Kg altogether.The preparation reference example one of Cypres.

The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit essence is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.

Claims (2)

1. surface sizing agent for paper making, it is characterized in that: composition of raw materials is made up of following composition and weight percentage:

Starch 6.5-8%;

Styrene 4.5-6%;

Acrylonitrile 4-5%;

N-BMA 5.5-6.5%;

EHMA 2-3.5%;

Isooctyl acrylate monomer 0.4-1%;

Hydrogen peroxide 0.2-0.5%;

Formic acid 0.5-1%;

Ferrous sulfate 0.5-4%;

N-dodecyl mercaptan 0.5-3%;

Amylase 0-0.2%;

Water surplus.

2. surface sizing agent for paper making according to claim 1 is characterized in that: described starch is converted starch.