SU657102A1 - Paper pulp sizing method - Google Patents

Description

The invention relates to the pulp and paper industry and concerns the production of paper for printing with water-based inks, writing, and watercolor painting. S Paper sizing is widely known by dosing into the mass or by applying from the surface special water-repellent compositions based on rosin products, paraffins, BOCKOBf synthetic materials. In connection with the decline in the world level of rosin products and the steady increase in paper production, the greatest interest is the creation of synthetic rosin substitutes that can be divided into two classes: substitutes derived from direct processing of individual fractions of natural oil, so-called petroleum resins l and products obtained through the chemical transformations of pure-organic substances 2. Substitutes based on petroleum resins are mostly only partial substitutes for nifoli. Until recently, their main advantage over natural products was relatively low cost. However, due to the sharp increase in the cost of crude oil, the price of petroleum resins increased by a factor of 2-3 and in a number of cases increased the cost of crude oil. From pure organic substances based on rosin substitutes, various aromatic carboxylic acids are quite effective. Closest to the invention is a method of sizing paper pulp with benzyl benzoic acid 2. The above method does not provide the necessary degree of sizing for these papers. In addition, it is relatively expensive. The treatment of wastewater from the production of paper glued with benzyl benzoic acids poses considerable difficulties, since compounds with isolated matrices are difficult to degrade biologically. The aim of the invention is to improve the degree of sizing paper. This goal is achieved in that in the method of sizing paper pulp by treating it with an aromatic carboxylic acid sizing agent according to the invention, sodium salts of isopropylphenanthrenecarboxylic or monoisopropylfluorenecarboxylic acids are used as sizing agent. Monoisopropyl- and / or diisopropylphenanthrenecarboxylic acids are used as isopropylphenanthrenecarboxylic acids. These substances are introduced in the amount of 0.5-5 wt.% By weight of absolutely dry fiber. Used from propylphenanthrenecarboxylic acids are described by the general formula: where P 1 or 2. Monoieopropylfluorecarboxylic acids are described by the general formula These two types of aromatic acids are in the proposed method technical equivalents in relation to achieving the set goal - increasing the sizing of paper. Isopropylphenanthrenecarboxylic and monoisopropylfluorenecarboxylic acids are a mixture of isomers; in addition, the first acid may contain impurities of the second, which is associated with the quality of the feedstock for the synthesis. Example. 90 g of diisopropylphenanthrenecarboxylic acid having the formula are treated with 10 g of a 30% NaOH solution. The reaction proceeds, when heated, to within 2.5 hours. The resulting alkaline solution is diluted to a concentration of 30-35 g / l. . the glue solution is introduced into ground pulp consisting of 100% bleached sulphite pulp in an amount of 3% by weight of absolutely dry fiber. Paper weight of 70 g / m was poured from paper stock on experimental paper machine. After conditioning the samples by various methods, the degree of sizing of the paper was determined. In parallel, a paper sizing composition containing up to was prepared. 90% benzylbeic acid and 10% NaOH, which was introduced into a paper pulp, also consisting of 100% bleached sulphite, was ground to. Further, as indicated above, paper was cast from it. Data from the results of tests of papers obtained in example 1 are shown in table 1. Table

Water soluble isopropylphenanthrenecarbo salt Example2. 94g of isopropylphenanthrenecarboxylic acid is treated with 6 g of 30% NaOH solution. The reaction proceeds by heating to 3.5 hours. The resulting

the solution is diluted to a working concentration of 70-75 g / l and injected into the pulp, ground to 45ShR, in the amount of 2.5% by weight of absolutely dry fiber.

five

At the same time, a composition containing benzyl-isoic acid, alkali is prepared. From paper pulp on Rapid Ketten plants

Water soluble mono-propylphenanthrenecarboxylic acid salt

Benzylbenzoic

acid

Example 80 g of a mixture containing 20% diisopropylphenanthrenecarboxylic acid and 80% monoisopropylphenanthrenecarboxylic acid are treated with a 20% siaOH solution. The reaction proceeds by heating to 2.5 hours. A clear, slightly colored solution is obtained, which is diluted to a concentration of 45-50 g / l and metered into paper

A water-soluble monosubstituted salt, isopropylphenanthrenecarboxyp R and mep 4. The paper pulp was treated with the sodium salt of monoisopropylfluorenecarboxylic acid, taken in an amount of 0.5% by weight of absolutely dry fiber. Sodium salt of monoisopropylfluorenecarboxylic acid was prepared according to example 1.

6

get castings. Data on the degree of sizing paper, obtained according to example 2, are given in table 2.

Table 2

285 18.3

261 18.9

the mass obtained according to example 1, in the amount of 4% by weight of absolutely dry fiber. In parallel, a paper sizing composition containing 82% benzyl benzoic acid and 18% NaOH was prepared, which was introduced into the pulp according to example 1. The results of the test results of the papers obtained in example 3 are shown in table 3.

Table 3

From the resulting paper pulp, a paper mass of 80 g / m was pulped. A paper pulp comprising 0.5% benzyl benzoic acid sodium salt was prepared. Data of test results of paper are given in table 4.

Sodium salt

mono-propylfluorene carboxylic acid - {), 5

Sodium salt of benzylbenzoic acid-0, 5

Example 5. The paper pulp according to example 1 was treated with the sodium salt of monoisopropylfluorenecarboxylic acid in the amount of 2.5% by weight of absolutely dry fiber. The concentration of the solution is 20 g / l.

In parallel, we received a paper batch glued with benzyl benzoic acid sodium salt in the amount of 2.5% by weight of absolutely dry fiber. Sodium salt of monoisopropylfluorenecarboxylic acid — 2,5 4,83 1,5 Sodium salt of benzyl benzoic acid — 2,5 4,62 1,5

These examples indicate that the degree of paper sizing using isopropylphenanthrenecarboxylic and monoisopropylfluorecarboxylic acids as a sizing agent exceeds the degree of paper sizing using benzyl benzoic acid as an sizing agent by an average of 10%.

The papermaking technology using the proposed sizing agents does not change as compared with the known papermaking technology,

Claims (3)

1. The method of sizing paper pulp by processing its sizing 6270 71.4 4870 38.0 From the resulting paper stock, writing paper No. 1, weighing 70 g / m, was cast on an experimental paper machine. In parallel, received a batch of paper, glued sodium benzyl benzoic acid. The data of the test paper are given in table.5. Table5 a substance based on an aromatic carboxylic acid, which also means that the sodium salt of isopropylphenanthrenecarboxylic or monoisopropylfluorenecarboxylic acid is used as a sizing agent. 2. The method, that is, with the fact that monoiepropyl and / or diisopropylphenanthrenecarboxylic acid is used as isopropylphenanthrenecarboxylic acid 3. Method according to Claims 1 and 2, that is, and with the fact that the said substances are introduced in a quantity of 0.5 to 5 wt. to the mass of absolutely dry fiber. 534 15.6 2960 293 17.3 2390 9657102If Sources of information taken2. Patent SGHid 3402 00, into account when ekspertizlykl.Y62-164, 1968. 1. Japanese Patent 67-804, .3. Certificate of authorship CL.391322. 204889, M.C. D21 D 3/00, 196,