SU755827A1 - Composition for gluing fibrous materials - Google Patents

Description

The invention relates to the pulp and paper and woodworking industry, and in particular to compositions for gluing fibrous materials, such as paper, cardboard and wood-5 lobny plates.

Rosin-based sizing compositions are widely known in the industry. Rosin glue is prepared by full or partial saponification, rosin with alkali at 90-98 ° C, followed by dispersing it in warm water, and then diluting with cold water. Rosin increases the hydrophobicity of paper, reducing its absorption capacity for water and aqueous solutions [1].

The sizing of certain types of paper, in particular cardboard and plates, by using in 20 as a water-repellent agent, paraffin, characterized by increased hydrophobic properties, is also well known. Paraffin can be either an integral part of rosin-paraffin cotton or used as an emulsion containing only paraffin as a hydrophobic substance. In the latter case, as an emulsifier for the preparation of 100% paraffin dis-

2

Persia uses fatty, synthetic fatty acid soaps, calcium and sodium (ammonium) salts of lignosulfonic acids [2].

But paraffin dramatically reduces the mechanical performance of paper, cardboard and plates. Rosin-paraffin adhesives are commonly used, where the paraffin content, depending on the mode of preparation of the adhesive, reaches 20-40%.

The technical essence and the resulting effect is the closest to the invention is a composition comprising rosin, rosin soap, paraffin, in the following ratio of components, wt.%:

Rosin 15

Emulsifier (Rosin soap) 35

Paraffin 12.5

Track Alkali _

Water Else [W].

Resin-paraffin glue is used when increased paper hydrophobicity is required, but the disadvantage of using this composition is a significant reduction in the mechanical strength of paper.

The aim of the invention is to increase the bonding strength.

755827

This goal is achieved by the fact that the composition for sizing fibrous materials, including paraffin, emulsifier, alkali and water, additionally contains alkylphenolamine resin with a nitrogen content of 2.5-4%, a molecular weight of 600-1500, softening temperature · 75-100®С the following ratio of components, wt.%:

Alkylphenolamine resin 15-65 Emulsifier 0.5-8 Paraffin 4-20 Alkali 0.1-5.0 Water Rest The composition is obtained in form of water dis-

Persia follows.

15-65 weight.h. alkylphenolamine

the resin is mixed with 4-20 weight.h. paraffin wax. (or gacha, petrolatum, petroleum wax) ,, then add 0.5-8 wt.h. rosin or fatty acids. The mixture of resins is melted in a smelting reactor, heated to 130–150 ° C and dispersed. ” they are guided in an aqueous solution of alkali in the field of small-scale pulsations created, for example, by a rotor-pulsation-type apparatus. With the passage of the melt and alkali through the slots of the rotor and stator lattice, the rosin or fatty acids are neutralized with alkali, the resin is dispersed

5 and the stabilization of the resulting dispersion with the resulting soap of rosin or a fatty acid, the Alkylphenolamine resin of the indicated property is a thermosetting resin, its viscosity increases when heated. Paraffin or similar substances are added to the resin to increase the viscosity of the resin melt in order to increase its flowability when entering the apparatus and the efficiency of dispersion. When using the specified ratio of components, a stable adhesive dispersion of a milky color with a particle size not higher than 1.5 μm is obtained.

Rosin soap or fatty acid soaps can be used as an emulsifier.

The resin used has the following formula

HE

HE

where K - C ₄ - C _{r0 is} alkyl;

H, Cd — C ₂ 0 -alkyl;

0.5-2;

1-2,

0.5-2.

The resin is a hydrophobic solid of light yellow color with a molecular weight of 600–160 ° C, a softening temperature of 75–100 ° C, a nitrogen content of 2.5–4%. The resin is soluble in benzene, alcohol, acetone, mineral oils and paraffin.

EXAMPLE 1 In the laboratory, was prepared sizing composition comprising alkilfenolaminnuyu resin with a nitrogen content of 2.5%, molecular weight 600, softening temperature of 75 ^ft · C, paraffin wax, sodium hydroxide, water at the following ratio, wt.%:

Alkylphenolamine resin 65

Paraffin 15

Rosin soap 8

Caustic soda 5

Water Rest

The composition is obtained as follows.

65 weight.h. alkylphenolamine resin. mix with 15 wt.h. paraffin, then add 7.4 weight.h. rosin.

The mixture is melted in a smelting reactor, heated to 150 ° C and dispersed, an aqueous solution of alkali (7.0 parts by weight of IaOH) in the field of small-scale pulsations created by a rotary pulsator-type apparatus. 65

to ₂

η

t

to

35

40

45

50

55

0 ^{th ,!} WITH'

to

he

Example 2. Was prepared sizing composition comprising alkylphenolamine resin with a nitrogen content of 3%, molecular weight 1000, softening temperature 85 ° C, paraffin, caustic soda, water in the following ratio of components, wt.%:

Alkylphenolamine resin 4 0

Paraffin 12

Rosin soap 4.25

Caustic soda 2.55

Water Rest

The composition is obtained as follows.

40 weight.h. alkylphenolamine resin is mixed with 12 weight.h. paraffin, then add 3.95 weight.h. rosin. The mixture is melted in a smelting reactor, heated to 150 ° C and dispersed in an aqueous solution of alkali (4.0 parts by weight).

IaON) in the field of small-scale pulsations created by a rotor-pulsating device.

Example 3. In the laboratory, was prepared sizing composition comprising alkylphenolamine resin with a nitrogen content of 4%, molecular weight of 1500, a softening temperature of 100 ° C, paraffin, caustic soda, water in the following ratio of components, wt.%:

Alkylphenolamine resin Paraffin

Synthetic fatty acid soap

15

0.5

60

five

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6

Caustic Potash 0.1

Water Rest

The composition is obtained as follows. 15 weight.h. alkylphenolamine resin

mixed with 4 weight.h. paraffin, then add 0,47 weight.h. synthetic fatty acid with the number of carbon atoms C | ₇ — C ₂₀ The mixture is melted in a smelting reactor, heated to 150 ° C and dispersed in an aqueous solution of alkali (0.3 parts by weight of KOH) in the field of small-scale pulsations created by a rotary pulsation apparatus.

Adhesive dispersions in examples 1-3

were used for paper sizing for offset printing and bag paper. The paper was glued in bulk, the glue dispersion was precipitated by aluminum sulphate.

5 The composition of paper for offset printing is 100% bleached sulphite pulp, the composition of sack paper is 100% unbleached sulphate pulp. For comparison, paper sizing was carried out with rosin-paraffin and white rosin glue.

Physico-mechanical properties of the obtained paper samples are given in the table.

Consumption of sizing agent,% by weight of fiber

Indicators of physical and mechanical properties of paper

The proposed composition according to the examples

Composition And (rosin-steam fin glue)

Composition And (rosin glue)

Paper for offset printing

one The degree of sizing, g / m ² ten 12 14 15 20 3 • - II - nineteen ten 12 12 15 one Breaking length m '4000 3900 3500 2900 3300 3 - (one - 4100 3600 3300 2500 3200 one Kink (number of double folds) 95 80 60 thirty 42 3 - and - 85 60 55 15 35 Bag paper 2 The degree of sizing, g / m ² five eight ten ten 15 2 Breaking length m '5000 4800 4500 3500 4300 2 Kink (number of double folds) 900 850 800 350 580

As follows from the comparative data of the table, the use of the composition for sizing fibrous materials can improve the mechanical properties of paper.

In addition, the use of the composition of 60 will replace the rosin, widely used in the pulp and paper and woodworking industry. which is scarce and expensive material. 65

Claims (1)

Composition for sizing fibrous materials, including paraffin, emulsifier, alkali and water, characterized in that, in order to increase the bonding strength, it additionally contains an alkylphenolamine resin with a nitrogen content of 2.5-4%, a molecular weight of 600-1500, a softening temperature of 75-100 ° With the following ratio of components, wt.%: 755827 7 Alkylphenolamine resin 15-65 Paraffin . 4-20 Emulsifier 0.5—8 Alkali 0.1-5 Water Rest