SU1719521A1 - Pulp for making insulation paper - Google Patents

Abstract

The invention relates to the pulp and paper industry, in particular to the manufacture of paper for getinka, and allows to improve the quality of paper by increasing its capillary absorbance ™ and dielectric strength. Paper pulp contains the following components, wt.h.: sulphate pulp 60-90; fiber lavse 10-40 and cationic polyelectrolyte 0.5-2.5. As a cationic polyelectrolyte, the product of polycondensation of adipic acid with diethylenetriamine modified with epichlorohydrin is used. 2 tab.

Description

The invention relates to the technology of pulp and paper production, mainly to the technology of manufacturing electrical insulation paper, in particular, intended for use as a glue layer in the production of foil-reinforced concrete.

The known paper pulp in the method of making electrically insulating paper, including sulfate unbleached pulp, lavsan fiber and the product of polycondensation of epichlorohydrin and ammonia, where the latter is used to improve the quality of paper (1). The disadvantage of this method is that the paper quality is not high enough, namely, capillary absorption and electrical strength.

The closest in technical essence and effect achieved is a paper pulp for the manufacture of electrically insulating paper, including

non-protein sulphate pulp, lavsan fiber and polyamide-polyamine-epichlorohydrin, added to improve paper quality by increasing capillary absorption ™ and strength in dry and wet conditions, in the following ratio of components, parts by weight: Cellulose 60-80

Fiber polyester 20-40

Polyamidepolyamine-chlorohydrin 1-3 (2)

A significant disadvantage of this paper pulp for the manufacture of electrically insulating paper is that the paper produced therefrom does not have sufficiently high capillary absorbency and dielectric strength. In addition, polyamide polyamine-epichlorohydrin resin used in paper pulp is imported, and its purchase has recently been discontinued.

The purpose of the invention is to improve paper quality by increasing capillary absorption and dielectric strength.

This goal is achieved by using paper pulp to make electrically insulating paper, including sulphate pulp, lavsan fiber and cationic polyelectrolyte, which uses 10 products of the reaction of polycondensation of adipic acid with diethylenetriamine, modified with epichlorohydrin (PACDE), in the following component ratio paper weight, parts by weight: 15

Cellulose 60-90

- Fiber polyester 10-40

The product of the polycondensation reaction of adipic acid with diethylenetriamine, modified by epichlorohydrin 20 0.5-2.5

The product of adipic acid polycondensation reaction with diethylenetriamine, modified by epichlorohydrin, is a cationic polyelectric-25 rolit with the general formula

-CH2-CH-CH2 H-CH2-CH2) 2-YH-C- (OH2) 4-C-b

00

where 10-14.30

The product PAKDE is manufactured by Novo-Polotsk NPO Polymer (TU 6-10-21-88) under the trade name Vodamin-115 with a molecular weight of 2.7-3.8 thousand units.

The main requirements for the quality characteristics of the 35 PACKE product are given in Table 1.

PACDE polyelectrolyte is of low toxicity (hazard class –4 hazard class), non-flammable and non-explosive (for fire hazard 40 - category B),

PRI me R. 90 kg (parts by weight) of e-2 grade sulphate cellulose are broken in a hydraulic spreader at a water-fiber suspension concentration of 2.0% for 30 minutes, out of 45 pulper dispensers, the mass flows by gravity into the machine basin and is further ground under the scheme : receiving pool - enthestipper - refiner I - refiner II -. receiving basin to a degree of 50 milling of 25 ° SR. After dosing 0.5 kg (0.5 parts by weight) of the PACDE product into the receiving basin and mixing for 10 minutes, the pulp is sent to the composite basin.

In parallel, a suspension of lavsan 10 kg (10 parts by weight), pre-cut fibers 6 mm long, is prepared in the second pulper. dissolve at a concentration of 0.8% for 5 minutes and direct the pulp from lavsan to the composite basin.

In the composite pool, the paper pulp components are mixed at a concentration of 0.2% dry matter and sent to the pool of adjusted mass and then to low tide, which is carried out on an inclined grid table at a mass concentration of 0.02%, and a paper with a mass of 1m2 is obtained. 80 g.

The paper is tested in accordance with the requirements of TU 13-7308001-681-84 amended. № 1 and m ° 2.

The results of the test paper made from the proposed paper pulp, according to examples 1-5 and example prototype 6 are shown in table 2.

As can be seen from the table, the use in paper pulp on the basis of sulphate pulp (60-90 parts by weight) and lavsan fibers (10-40 parts by weight,) of the product PAKDE in the amount of 0.5-2.5 parts by weight. allows to obtain high-quality electrically insulating paper from it. The capillary absorption capacity in comparison with the prototype increases by 34.8–87.9%, the electrical strength by 6–16.4% with some improvement in the mechanical characteristics of the paper.

Claims (1)

Claims of paper pulp for the manufacture of electrically insulating paper, including sulphate pulp, lavsan fiber and cationic polyelectrolyte, characterized in that it contains a reaction product to improve paper quality by increasing its capillary absorption and electrical strength. adipic acid polycondensation with diethylenetriamine, modified by epichlorohydrin, in the following ratio of components, parts by weight: . Sulphate pulp 60-90 Fiber polyester 10-40 The product of the reaction of polycondensation of adipic acid with diethylenetriamine, modified by epichlorohydrin 0.5-2.5 Table 1 Table 2