SU834300A1 - Filtering carboard - Google Patents

Description

(54) FILTER CARDBOARD 1

L1

FIELD OF THE INVENTION The invention relates to pulp and paper industry and relates to the production of cardboard for filtering air and oil in internal combustion engines.

Known filter board containing, wt.%: Sulphate pulp 88-94, polyshipspinol fiber 3-6, melamine-formaldehyde resin 3-60-1 well-known filter paper suitable for filtering liquids, such as beer, and not used for filtering air and oil in internal combustion engines of high air permeability. Closest to the heading is fiber pulp for making filter paper, including May. %: mercerized cellulose 5-74, viscose fiber 25-90, synthetic fiber vinol 1-5. Dp impart hydrophobic properties to the cardboard; hydrophobic additives such as melamine-formaldehyde

resin, rosin or rosin-parafshuvy glue in the amount of up to 4-5% by weight of absolutely dry. G2 fibers}.

The disadvantage of such cardboard is the use of mercerized cellulose in its composition, which leads to high consumption of alkali on mex; pulp pulping. In addition, the known cardboard has a high resistance to the flow of air (9-lb mm water. From), which is unacceptable during air filtration.

The purpose of the invention is to improve the hydrophobic and filtering properties of cardboard.

This aim is achieved in that the cardboard for filtering voeduha and oils in internal combustion engines comprising cellulose, rayon, polivinilspirtovoo fiber melaminoformaldegidkuyu resin, rosin or mixture of rosins with paraffin, further comprising a petroleum resin, and as ka1shfoli - wood rosin at The following ratio of components, May. %:

Cellulose

2.5-37

Viscose fiber 12,5-45

Polyvinylspir0, 5-2.5

tow fiber

Extraction Ka7, 5-11.25. Nyfol

Petroleum polymer 1.25-2.5

resin

I ate m al-form al 37 .5-40 dehydric resin

As cellulose the cardboard contains cotton cellulose. The introduction of petroleum resin 1 in the composition of the filter paper contributes to the improvement of its filtering ability by introducing additional poly; dimensional groups that when molded

Content, May. %, composed

. g tb (

onents

35 12.5

cellulose fiber

the workshop

2.5 1.5

nas 11, 25 7,5 ers sm (form a more ordered structure and contribute to the improvement of hydrophobic properties of cardboard

Example 1-5. Cotton pulp is milled in a roll up to 16-17 CR, viscose fiber 5 mm long and popivinyl alcohol fiber 4-5 mm long are injected into the ground pulp, then the pulp is mixed for 15 minutes. In the resulting composition. sizing agents are introduced: white glue from extraction rosin or its mixture with paraffin, petroleum and measuring resin and a solution of melamine-formaldehyde resin.

In tab. Figure 1 shows the ratio of carton components for filtering air and oil in internal combustion engines.

Table 11L)

35 12.5

2.5

37 14

2.5 45

45

2.5

Oh 5

0.5 12.5 10

5 5

Claims (2)

1. Filter card containing cellulose, viscose fiber, polyvinyl alcohol fiber, melamine formaldehyde resin, rosin or its mixture with paraffin, characterized in that, in order to improve the hydrophobic and filtering properties, it additionally contains petroleum resin, and as rosin it is an extraction resin. with the following content of components, May. %: Cellulose 2.5-37 Viscose fiber 12,5-45 Polyvinyl alcohol fiber 0.5-2.5 Extraction or rosin her with paraffin 7-11-11.25 Oil polymer resin1.25-, 5 M elam foreign formaldehyde resin 37,5-4О 2. The cardboard according to claim 1, characterized in that it contains cotton pulp as cellulose. Sources of information taken into account in the examination 1. USSR author's certificate No. 354047, cl. D 21 H 15/00, 1972. 2. USSR author's certificate number 362106, cl. D 21 N 3/00, 1972 (prototype).