DE1262482B - Means for lubricating the inside of the machine wires of Fourdrinier paper machines - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

ClOm

German class: 23 c -1/01

Number: 1262482

File number: N 22179IV c / 23 c

Filing date: October 5, 1962

Opening day: March 7, 1968

One of the most versatile machines used in papermaking is the Fourdrinier paper machine. The usual types of paper can be produced with this machine. With fast moving Fourdrinier paper machines, however, have the disadvantage that the machine wire is excessively worn is large so that its life is short.

Replacing the Fourdrinier is an expensive and time-consuming job because it involves production must be interrupted and a carefully executed replacement process is required.

It has now been found that the machine screens of Fourdrinier machines are much longer Have service life when used as a lubricant in a solution

a) water,

b) alkali salts of 2-mercaptothiazole, 2-mercaptobenzimidazole, 2-mercaptobenzoxazole or 2-mercaptobenzothiazole,

c) a non-quaternary cationic dispersant and

d) a silicon compound of the formula

(O)"
R (O) _n Si Y

Means for lubricating the inside

the machine sieves

of Fourdrinier paper machines

Applicant:

Nalco Chemical Company,

Chicago, JIl. (V. St. A.)

Representative:

Dipl.-Chem. I. Schulze, patent attorney,

6900 Heidelberg, Gaisbergstr. 3

Named as inventor:
Roderick Eggert Eddy,
Jacksonville, Fla. (V. St. A.)

Claimed priority:
V. St. v. America December 22, 1961
(161 701)

is used in which R is a Ci-4-alkyl radical, Y is an aliphatic, amine-containing group and «= O or 1 is.

In addition, this means reduces corrosion and thus the abrasion resistance and the drainage properties of the screen are significantly increased. This remedy only needs in a lot of 0.005 pounds per ton of finished paper can be sprayed onto the inside of the machine screen.

The drawing is a simple schematic representation of a Fourdrinier paper machine. Numbers used in the drawing indicate the different parts of a feeding system. The simplified drawing serves as a general illustration of a head piece 1, storage device area 2, breast roller 3, cover rollers 4, cable board ^, roller table 6, tray 7, suction boxes 8, squeezing cylinder 9, pre-pressure roller 10, lump breaking roller 11, wire sprayer 12, washing rollers 13, automatic guide rollers 14, Draw rollers 15, wire return rollers 16 and 16 A. The screen is 18. The spray nozzle 17 between the return roller 16 A and the breast roller 3 is arranged so that the solution is sprayed uniformly over the entire width of the screen 18, namely on the inside.

As part of the solution, the alkali metal salts, for example sodium, potassium, cesium and rubidium salts, preferably the sodium salts of 2-mercaptothiazole, 2-mercaptobenzimidazole, 2-mercaptobenzoxazole and 2-mercaptobenzothiazole, preferably 2-mercaptobenzothiazole, used.

With the ammonium salts, however, difficulties arise because of their volatility.

As non-quaternary cationic dispersants, compounds with at least one, but no more than two aliphatic groups with at least 6 carbon atoms in the longitudinal chain, preferably 12 to 22 carbon atoms, or their carboxyl and inorganic salts, such as acetates, Sulphates, chlorides, can be used, for example

809 517/637

aliphatic amines of the formula

R --Ν -

H (CH ₂ ) "N

where R is an aliphatic radical having 12 to 22 carbon atoms, η is an integer from 2 to 6 and χ is an integer from 0 to 5.

This subheading includes the fatty-substituted alkylenediamines and polyalkylene polyamines, e.g. B. n-dodecylamine, n-tetradecylamine, dicocoamine, n-hexadecylamine, n-octodecylamine.

Fat-substituted alkylenediamines are z. B. N-Lauryltrimethylenediamine, N - coconut trimethylenediamine, N-soyatrimethylenediamine, and N-tallow trimethylenediamine.

According to the invention, amines with mixed aliphatic fatty groups are used, the general occur as components of animal fats and vegetable oils.

Another group of non-quaternary cationic dispersants are imidazolines of the formulas

R-C

; N-C-Y x N-C-Y

and R - C

^ n-c -H \ sr -c-H

DR 'Z

D ¹ R 'Z

where D is a divalent, non-aminic organic radical having fewer than 25 carbon atoms is. D 'is a divalent organic radical having fewer than 25 carbon atoms and at least an amino group. R is «in an aliphatic radical with at least 7 carbon atoms, preferably 11 to 21 carbon atoms. R 'is hydrogen or R. Y and Z are hydrogen or Ci-6-alkyl radicals.

Imidazolines of the type mentioned are known and are in the U.S. Patents 2,267,965, 2,355,837 and 2,865,817, such as, for example, l- (2-aminoethyl) -2-heptadecylimidazoline and 1- (2-hydroxyethyl) -2-heptadecylimidazoline.

According to the invention, the imidazoline has the formula

R-C

^ N-CH,

^S N —CH ₂ CH ₂ CH ₇ OH amine-containing group and η = O or 1, e.g. B. γ - aminopropyltriethoxysilicon, Δ - aminobutylmethyl diethoxysilicon and 2- (3-trimethoxysilylpropylamino) ethylamine. As already mentioned, the additive is used in relatively small amounts, e.g. B. 0.005 pounds per ton, preferably from 0.025 to 0.1 pounds per ton, based on the dry weight of the paper produced. Component b) is used in an amount of 5 to 97.99 percent by weight, component c) in a Amount of 2 to 92 percent by weight and component d) is preferably used in an amount of 0.01 to 5 percent by weight. A suitable solution has e.g. B. the composition

Components by weight

Na-2-mercaptobenzothiazole 25

Isopropanol 20

l- (2-hydroxyethyl) -2-heptadecyl-

imidazoline 20

2 - (3 - trimethoxysilylpropylamine) -

ethylamine 0.1

Soft water 34.9

example 1

The machine screen of a long paper machine has an average service life of around 7 days. Applying the aforesaid solution, 0.25 pounds per ton for a daily production rate Experience has shown that the service life has increased from 600 tons to 16 days.

B ei s ρ i e 1 2

The machine screen of a Fourdrinier machine for unbleached cardboard, in which an average of 200 to 400 tons of paper are produced daily, which has a width of 558.80 cm and a working speed of 335.36 and 624.24 m per minute and at which the pH value of the wastewater is between 5.5 and 6.5, experience shows that it has an average lifespan of l ^l k to 9 days.

Four consecutive screens were treated with the initial amount of additive Was 0.1 pounds per ton and decreased to 0.05 pounds per ton after a few hours became. The additive was applied to the inside of the screen by a spray device. The average lifespan increased to 16.3 days.

In both experiments, the tests showed an extraordinarily clean and light-colored sieve.

preferred in which R is a saturated aliphatic radical having 11 to 21 carbon atoms.

The silicon compounds have the general formula ^

(O) _n

R- (O) _n -Si-Y (O) _n
N
where R is a Ci_4-alkyl radical, Y is an aliphatic,

60

65

Claims (3)

Patent claims: 1. Means for lubricating the inside of the machine wires of Fourdrinier paper machines, consisting of an aqueous solution of three components known as lubricating additives, characterized in that it is a solution a) water, b) alkali salts of 2-mercaptothiazole, 2-mercaptobenzimidazole, 2 - mercaptobenzoxazole or 2-mercaptobenzothiazole, c) a non-quaternary cationic dispersant and d) a silicon compound of the formula R- (O) _n -Si-Y (O) _n R. contains, wherein R is a Qi-alkyl radical, Y is an aliphatic, amine-containing group and η = O or 1, contains. 2. Composition according to claim 1, characterized in that it is not a quaternary cationic Dispersant an aliphatic amine of the formula R —N - (CH ₂ ) "N 20th , H contains, where R is a Ci2-22-alkyl radical, η 2 to 6 and; c is O to 5. 3. Composition according to claim 1, characterized in that it is not a quaternary cationic Dispersing agent an imidazoline of the general formula ίΝ —C —Y R-C ; Ν - C— Y or R-C DR 'Z D'R 'Z contains where D is a divalent hydrocarbon radical of up to 25 carbon atoms, D ' divalent hydrocarbon radical with up to 25 carbon atoms and at least one amino group, R is a C7-2i-alkyl radical; R 'is hydrogen or R and Y and Z are hydrogen or Ci-6-alkyl radicals mean. 1 sheet of drawings 809 517/637 2.68 © Bundesdruckerei Berlin