DE2007790C3 - Process for the production of sized paper - Google Patents

Description

Stability, the flatness and smoothness as well as the electrical conductivity were determined. It is important that the pH value of the BIATbilduS (un S.ebwasser) can be proven to be freely selectable. Process engineering advantages, ζ. The sheet formation is realized at pH values of 6 to 8. "The method according to the invention for surface sizing is thus characterized by good sizing with small amounts of substance and by bringing about other desired properties of the paper or cardboard. ^C1 genscnatten

example 1

"Made of spruce sulphite pulp,

Freeness 35 ° SR, weight per unit area 80 g / m ² , pH value in the white water 6.2, is drawn through an aqueous solution which contains:

3 g / l of polystyrene-maleic acid sodium, 20 g / l of a paraffin containing about 35%

Dispersion. ao

After pressing and drying, the result is full writing glue according to DIN, a test sheet floats on ink for at least 300 seconds without bleeding through. The smoothness had compared with the untreated leaf, doubled. as

Example 2

An unsized sheet of spruce sulphite pulp, freeness 35 ° SR, weight per unit area 80 g / m ² , pH value in white water 4.8, is pulled through an aqueous solution which contains:

3 g / I polystyrene-maleinsauTcs sodium, 20 g / l of a paraffin containing about 35%

Dispersion.

After pressing and drying, the result is full writing glue according to DIN, a test sheet floats on ink for at least 300 seconds without bleeding through. The smoothness reaches about twice the value on the untreated sheet.

Example 3

An unsized sheet of 60% wood pulp, 20% spruce sulphite pulp and 20% filler, weight per unit area 70 g / m ² , is drawn through a solution according to Example 1. After pressing and drying, the result is full writing glue according to DIN. The ink swim test according to Example 1 achieved at least 270 seconds.

Example 4

A sheet made of 70% wood pulp, partially mass-glued with 1% resin glue and 2% aluminum sulphate and 30% spruce sulphite pulp is drawn through the solution according to Example 1. While that with Resin glue partially glued sheet no writing glue according to DIN and a Tintenschwimmiest according to the example 1 of 20 seconds, the surface-sized sheet was after squeezing and Drying fully glued according to DIN. The ink float test of Example 1 was 300 seconds increased.

Example 5 (counterexample)

As a counter-example, leaves according to Example I were drawn through the following solutions, pressed and dried:

a) 20 g / l of polystyrene-maleic acid sodium in water,

b) 20 g / l of a dispersion containing about 35% paraffin in water.

Both method a) and b) resulted in sheets which were not fully glued according to DIN was. The ink float test of Example 1 never exceeded 60 seconds.

The examples show that the synergistic combination according to the invention for surface sizing of paper and cardboard of any composition and any pH value is very suitable.

Claims (2)

1 <2 action products of natural and synthetic resins Patent claims: with maleic anhydride and others. In Tappi 38 (1955), No. 1, p. 129 A to 131 A, for. B. the 1. Process for the production of sized twist from salts of styrene-maleic acid-copoly-paper by applying the sizing agent to 5 merisate in aqueous solution for the surface dressing Surface, marked thereby, with these solutions for the purpose net that a combination of plasticizing oleic acid can be added as a sizing agent, of water-soluble salts based on styrene-maleic Despite the favorable properties could be acid anhydride copolymer on the one hand and aqueous such surface sizing agents often not against the On the other hand, dispersions of waxes, on the other hand, prevail over conventional cement sizes. root cause is turned. on the one hand there were undesirable side effects 2. The method according to claim 1, thereby counteracting, for example, an undesired influencing of the indicates that the sizing agent has amounts of grip or flexibility, on the other hand, the cost from 0.1 to 2 »/» of the copolymer and 0.1 to the process, which because of the not minor 5% of the wax dispersion, in each case based on the 15 application quantities, including the costs of the resin sizing entire sizing liquor is used. Resins exceeded. The USA.-Pai.entschrift 2 576 914 finally relates to the coating of paper, whereby a pigment-rich, made from a water-soluble salt ao a copolymers existing coating slip used which is also optionally small amounts The present invention relates to an improved wax, antifoam or wetting process for sizing paper or cardboard in processing agents can be added. In terms of quantity the surface. The term “paper or predominantly part of the coating slip” includes the pigment. Cardboard «are two-dimensional structures made of natural 25 A synergistic effect of two overlapping or synthetic cellulose material; this patent specification does not apply to certain products For example, take from bleached or unbleached lines. materials, wood pulp, regenerated cellulose fibers, etc., It has now been found that you can get a very good understood, with natural or synthetic Ma- and at the same time extremely inexpensive surface conductor materials of a different composition, such as polyester, achieved if an acrylonitrile or asbestos fibers are used as a sizing agent. Combination of water-soluble salts based on Stykönnen. The strength of such structures may be on the one hand to 1000 g / m ^ä from 15 to rol-maleic anhydride copolymer. and aqueous dispersions of waxes on the other hand Cellulosic materials show inherently counter-used. The term "waxes" is used in the over water, aqueous solutions and non-aqueous 35 senses by Ivanovszky (soap-oils-fats-waxes, Liquids have an absorbency, which is also understood in 1950, p. 13); therefore it also includes nadaraus produced papers or cardboard contain natural and synthetic hydrocarbon compounds. As a result, there is rapid fertilization, higher fatty acids and their derivatives Penetration of the paper or cardboard with aqueous or (z. B. stearic acid), wax alcohols, low-molecular non-aqueous Media, which makes it possible to use 40 lare polyethylene etc. and not just waxes in the to writing or printing paper as well as in a more general, narrow chemical sense. the resistance of such papers or cardboard to another, supplementary definition of the term the media mentioned is significantly affected. "Waxes" can be found in "Fette-Soap-Paint The elimination of the disadvantages mentioned by Tel ", 60 (1958), pp. 590 to 592. The classification of the waxes shown in this lite addition of suitable substances to the fiber suspension 45 before sheet formation is summarized as sizing in the mass mineral waxes and their raffinates , Called plants. For a long time, waxes and their raffinates, animal waxes and soaped or emulsified natural resins in combinations of raffinates, semi-synthetic waxes and full nation with aluminum compounds have been used for this purpose. Over the synthetic waxes. Oleic acid is by the time various sizing agents 50 named definitions were not covered and is therefore suggested, so z. B. Tall oil products, hydrocarbons - not under the term "waxes".
carbon resins, polyamide resins, fatty acid derivatives, the dispersions used according to the invention Alkyl ketenes and much more. In addition to that, in the concentration range from 10 to 50%, cement sizing can be used, for which in the course of time it becomes very difficult. Through this combination, a synergistic process became known, a shear effect was achieved, which, with considerable savings, however, also results in a sizing process through subsequent additions of copolymer (80% and more) a loan application of suitable substances to the upper degree of sizing than that Use surface, the so-called surface sizing. of the copolymer alone. This is about eo over-dieee either in addition to a given, surprisingly, as well as sizing with the possibly reduced in-situ sizing or even for 60th dispersions alone is not possible. One works individually and draws a calibration in addition to the preparation with amounts of 0.1 to 2% of the addition of the sizing effect through additional copolymer and 0.1 to 5% of the wax dispersion, favorable influence on the surface properties based on the entire sizing liquor,
like smoothness and tendency to dust. At the same time, the above According to the literature, the frequently occurring undesirable information mentioned is used for surface sizing For example, dissolved or dispersed polythene mitigates side effects of surface sizing based on acrylic acid ester, also used styden, the sheet remains soft and flexible. In addition hinrol maleic acid polymeric polymers, Isocyanates, Re- from will have beneficial effects on the climate