MXPA97008879A - Use of agents in the manufacture of pasta papelera and pa - Google Patents

Abstract

The present invention relates to the use of oil-in-water amulsions to clean machines and parts of plants in the production of pulp, paper, cardboard and cardboard and to prevent the impurities of adhesives and resins adhering to those units. The emulsion comprises as component of the oily phase at least one of the following substances: 1. normal or isomeric saturated or unsaturated, open-chain or cyclic hydrocarbon, with 8 to 30 carbon atoms. 2. A saturated or unsaturated fatty alcohol, a saturated or unsaturated fatty acid, a monoalkyl fatty acid ester, a fatty acid amide or a monoalkylamine fatty acid saturated or unsaturated fatty acid, all the compounds mentioned under part 2 have 8 to 30 carbon atoms . 3. A mono- or polyester of a mono- or multivalent, saturated or unsaturated monocarboxylic acid with 2 to 30 carbon atoms and polyols with the exception of polyethylene glycols. 4. A polyamide of saturated or unsaturated fatty acids with 8 to 30 carbon atoms, and aliphatic polyamides with 2 to 6 nitrogen atoms. 5. An acyclic, preferably monocyclic and / or bicyclic terpene, in particular a terpene hydrocarbon and / or a terpene alcohol and / or a polyoxyalkylene compound based on alkylene oxides

Description

USE OF AGENTS IN THE MANUFACTURE OF PAPER AND PAPER PASTE DESCRIPTION OF THE INVENTION The present invention relates to the use of agents in the treatment of machines for the manufacture of pulp, paper, and cardboard, to clean these units of adhesive impurities from natural resins and / or synthetic polymers, and to prevent fouling of these units by such impurities. In the production of pulp and paper, appropriate measures are required to prevent the agglomeration and sedimentation of resinous portions of wood, adhesive portions of the waste paper, and plastic portions in the recycling of waste paper coated with latex, in order to avoid disturbances in production and damage to the quality of pulp or paper. According to European Patent EP 517 360 Al the inhibitory mixtures of surfactants and solvents, preferably fatty alkanolamides, ethoxylated compounds, aliphatic hydrocarbons, and orange terpenes are added to the suspension of pulp in an amount of 1-200 ppm. However, such agents used are insufficiently effective; by REF: 26053 this reason the manufacturing process must be frequently interrupted to clean the parts of the machine, in particular the endless cable and press section; According to the European Patent EP 178 340 Bl, only one is used as solvent. According to European Patents EP 235 015 Al and EP 599 440 Al, resin deposits can be prevented by cationic polymers based on epichlorohydrin and amines, or by the simultaneous use of nonionic surfactants. U.S. Patent Nos. 4,190,491 and 3,582,461 describe copolymers and condensates of dicyandiamide-formaldehyde whose effectiveness is also based on the interaction with anionic resin components in the pulp suspension. The ionomeric components are neutralized and dispersed, or the existing deposits are redispersed, without restricting the activity of cationic retention agents, as in the case of anionic dispersing agents. However, the applicability of the dispersing agents in the closed circuit water cycles is limited since the portions of dispersed resins are not completely bound to the anionic pulp fibers and then discharged, thus remaining in the water of industrial process to an increasing degree. Because deposits of sticky materials can not be sufficiently prevented from being deposited in papermaking machines, it is proposed in EP 359 590 Bl to coat an aqueous solution of cationic polymers together with a surfactant on the surfaces of the device. soluble in water, non-ionic or cationic. A similar application with selective treatment of endless cable and felts in papermaking machines is carried out according to "Daraspray-conception", which is described by T. Háttich, T. Hassler and G. Corbel in "Wochenblatt für Papierfabrikation" 122, 1994, pages 644-648. The disadvantages of this method are characterized by the fact that the formation of the coating layer depends on the equilibrium concentrations of the water-soluble components in the system, and that the brown elastic structure of the protective film becomes hard and brittle in the case of insufficient humidity. A further disadvantage results from the very specific dose of the various components, which is sometimes necessary to form the coating.

In addition, European Patent EP 550 230 Al proposes to clean the wicks or endless belts of the press section by the use of fatty acid imidazolines; and according to European Patent EP 647 737 Al these compounds are used together with ethoxylated nonylphenols and special sulfonates to prevent the depositions of the polyamidoamine and epichlorohydrin resins in the felts. European patent EP 0 648 820 A2 describes the compositions that are used to remove organic pigments from paper surfaces, adhesive residues of plastics, to release plastic coatings, and to clean metal surfaces of the lubricant residues for blades or color pencil marks, as well as to eliminate the PVC portions secured by means of adhesives. In this context, concentrated oil-in-water emulsions having a non-aqueous phase portion of 8 to 90% by weight, comprising various types of organic compounds, such as dicarboxylic acid diester, and which are used under partial application of ultrasound and additional additives (strips of non-woven fabrics) in the temperature range of -15 to 21 ° C, (5 to 70 ° F), for example partially under additional heating of the cleaner, during the cleaning operation. The emulsions also comprise solvents such as isopropanol, toluene, benzyl alcohol, methyl ethyl ketone, N-methyl-pyrrolidone, dimethyl ether of di- and triethylene glycol, and 3-methyl-3-ethoxybutanol, which limit the application of these emulsions in closed systems, for reasons of occupational safety and health hazards. However, particularly in the production of paper using waste paper, the inhibitory action of these known agents is insufficient, since the sticky components of the recycle raw material, in particular at temperatures above 50 ° C, are still deposited as a system finely dispersed in the pulp suspension, firstly in the dissolved state and then in the form of agglomerates (sticky) on the surface of the machines, in particular endless wire, endless belts or felts, cylinders, and guide rolls . This affects the quality of the paper by the formation of stains and holes, the production process is disturbed by the breaking of the pulp or paper networks; and there are disturbances in the drainage of the pulp suspension, in the formation of the leaves due to the decreased permeability in water and the absorption of water from the endless cables or felts, as well as in the drying due to heat transfer reduced. Since the described auxiliary agents are insufficiently effective, it is still necessary to clean the pulp and paper machines stopped or decelerated to date, by chemicals which are sprayed, for example, and rinsed with water together with the powder particles. after a certain period. Furthermore, it is known to clean endless cables in separate, continuous, endless cable cleaning plants, where cleaning is not always satisfactory at all. Other methods avoid these disadvantages by using endless cable materials specially coated with Teflon or other plastic materials; however, they are mechanically vulnerable and expensive. In addition, the use of oil-in-water specific emulsions as microbicidal substitutes in papermaking is known from German Patent DE 43 40 665 A1. Accordingly, there was an objective to eliminate the disadvantages described in detail above, and in particular to find agents for this purpose, which are used in the manufacture of pulp, paper and cardboard, using waste paper to treat the machines for the production of pulp, paper and cardboard, which are suitable for cleaning the machinery of the adherent agglomerates of synthetic polymers and natural resins and / or to prevent the adherence of these substances on the surfaces of the machines. This objective has been achieved through the use of oil-in-water emulsions to treat, in particular to clean the machines for the production of pulp, paper, cardboard or paperboard, or its parts of the adherent synthetic polymers and natural resins, or to prevent the adhesion of these substances on the surfaces of these machines or units of the machines. The mentioned emulsions are characterized in that they comprise as component of the oily phase at least one of the following substances, either alone or in mixture with the other substances mentioned. 1. normal or isomeric saturated or unsaturated hydrocarbon, open chain or cyclic, with 8 to 30 carbon atoms. 2. A saturated or unsaturated fatty alcohol, a saturated or unsaturated fatty acid, a monoalkyl fatty acid ester, a fatty acid amide or a fatty acid monoalkylamide of a saturated or unsaturated fatty acid, all compounds mentioned under 2 they have 8 to 30 carbon atoms. 3. a mono- or polyester of a mono- or multivalent, saturated or unsaturated carboxylic acid with 2 to 30 carbon atoms and polyols with the exception of polyethylene glycols. 4. a polyamide of saturated or unsaturated fatty acids with 8 to 30 carbon atoms, and aliphatic polyamides with 2 to 6 nitrogen atoms. 5. an acyclic, preferably monocyclic and / or bicyclic terpene, in particular a terpene hydrocarbon and / or a terpene alcohol and / or a polyoxyalkylene compound based on alkylene oxides. The oil-in-water emulsions described are known in various fields. However, it was a surprise to find that these emulsions have the property a) of cleaning the machines and the plant elements, of the special impurities and b) of preventing the adhesion of these special contaminants on the surfaces of the units of the machines or parts of the plants. The production of the emulsions to be used according to the present invention, in particular of stable oil-in-water emulsions, has been known for some time. For this purpose, the oily component is emulsified in water by means of known, suitable oil-in-water emulsifiers. The hydrophobic phase mainly represents the active substance. Examples of hydrophobic oily components include: saturated hydrocarbons, such as octane, tetradecane, octadecane, eisodecane, decene, hexadecene, and alpha-olefins technical fatty alcohols such as octanol, dodecanol, tridecanol, octadecanol, behenyl alcohol, fatty acids, such as capric acid, stearic acid, melic acid, oleic acid , linolenic acid - esters of fatty acids, such as methyl ester of stearyl acid, octadecyl ester of palmitic acid, octyl ester of oleic acid, glycerol mono- and trioleate, ethylene glycol dilaurate, sorbitan esters and oleates, as well as esters , in particular diesters of aliphatic and / or aromatic di- and / or tricarboxylic acids, such as esters of alkyl and isoalkyl of 1 to 13 carbon atoms of dicarboxylic acids of 2 to 12 carbon atoms, such as oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, piicic acid, suberic acid, sebacic acid, malic acid, tartaric acid, citric acid, phthalic acid, dodecanoic acid, dicarboxylic acid of 9 carbon atoms (trimethyl-adipic acid), as well as maleic acid and fumaric acid. Additional examples of these esters include: di-n-butyl oxalate, di-n-butyl malonate, di-n-butyl succinate, di-n-butyl glutarate, di-n-butyl adipate, di-n-butyl, di-n-butyl sebacate, dimethyl adipate, diethyl adipate, di-n-propyl adipate, diisopropyl adipate, diisobutyl adipate, di-tert-butyl adipate, di-adipate di- isoamyl, di-n-hexyl adipate, di (2-ethylbutyl) adipate, di (2-ethylhexyl) adipate, diisodecyl adipate, dimethyl phthalate, diethyl phthalate, di-n-butyl phthalate, phthalate diisobutyl, di (2-ethylhexyl) phthalate, and diisodecyl phthalate; - fatty acid amides such as stearylamide, fatty acid butylamide of coconut oil, oleylamide of acetic acid, and ethylene bis stearylamide. Additional suitable commercial hydrocarbons and hydrocarbon mixtures are paraffin oil, mineral oil or polyalphaolefins.

The agents to be used according to the present invention are more surprisingly suitable as cleaners or agents having an impregnation action against impurities, such as adhesives, resins, waxes, fats, and / or the bitumen repellent action, in any site of the machines for the production of pulp, paper and cardboard. The agents are used according to the present invention on the surface of the units, in particular under the treatment of the endless cables, felts in the humidification section of the machines, as well as the endless cables, guide rollers and drying cylinders. in the drying section. According to the present invention, the agents are preferably used on those surfaces of the units that make contact with the pulp, before its contact with the network, and, optionally, separately for the cover and back region of the products. The oil-in-water emulsions are used according to the present invention such as or after dilution with water and / or solvents, preferably water miscible solvents. In general, waters having temperatures in the range of 5 to 80 ° C, preferably 20 to 50 ° C are used for this purpose.

The concentration of the oil in water emulsion in aqueous dilution represents 1 to 40% by weight, preferably 5 to 25% by weight, and more preferably 10 to 25% by weight, relative to the aqueous dilution. The diluted emulsion is applied continuously or at intervals in an amount of 20-500 liters, preferably 100-400 liters per hour and meter of the working width of the machine; The diluted emulsion is applied in the desired manner, preferably via a s tube provided with flat jet nozzles having an overlapping s region. In the case of endless cable cleaning plants, the emulsion can be added to the washing water. The oil-in-water emulsions preferably used according to the present invention comprise biodegradable components, and are not harmful to the environment for this reason. The diluted emulsion is used, particularly in the case of very dirty endless cables, in the return movement of the endless cable, and the endless cable is optionally inflated with air before its contact with the paper web. Due to the action of the agents to be used according to the present invention, the sticky impurities lose their adhesiveness and are released from the surface of the units, either automatically or when they are sed with water, and are eliminated. When the agents are used according to the present invention, their cleaning action in the endless belt section and drying of the machines, continues towards the last part of the machine. The inhibitory action of impregnation on the surfaces of the units against renewed contamination depends on the product and its quality; this continues for a period of 4 to 75 hours after the end of the dosage. In the event that the surface sizing is deteriorated when the agents are used in the production of paper according to the present invention, the cleaning and impregnation of the units can be carried out with each change of grade or quality. The present invention will now be illustrated in more detail by the following examples: Production of a Paraffin Emulsion A 14 kg of paraffin (melting point of 48-50 ° C), 1.0 kg of hexadecanol, 7 kg of a 75% paraffin sulphonate, and 2.1 kg of water are homogeneously melted and then emptied under stirring into a solution that it has a temperature of 60 ° C and consists of 74.5 kg of water and 1.4 kg of an oleyl alcohol which is reacted with 20 moles of ethylene oxide. It results an oil in water emulsion which has approximately 20.5% solid matter.

Production of a Terpene B Emulsion The procedure is as in the production of emulsion A; however, 14 kg of terpene are used instead of paraffin.

Composition of the C-M Emulsions which are to be used according to the present invention (1) corresponds to Example 1 of European Patent EP 0 247 509 Bl Example 1 In the course of the papermaking run, an aqueous dilution of 20% by weight of the emulsion M is applied on the paper-contacting side of the endless belt, before its contact with the paper web; the emulsion is applied at intervals within a period of about 10 minutes in an amount of 250 liters per hour and meter width of the endless belt, by means of flat jet nozzles of a spray tube, which are accommodated to a distance of 25 cm with overlapping spray areas. The impurities are separated from the endless belt and the subsequent guide rollers and cylinders, and removed, partially under expulsion of the agglomerates, in particular during the initial phase of the treatment. The cleaning action can also be perceived in the subsequent parts of the machine, and this continues towards the satin cylinder of the machine. After the dosage of the diluted emulsion is completed, an inhibitory action against adherent impurities is found which lasts for approximately 24 hours.

Example 2 The emulsion B is applied in a dirty plastic endless belt of a papermaking machine, the plastic tape consisting of polyamide and polyester fibers. Figure 1 shows four samples of the endless belt; starting from the first very dirty sample (sample 0), the cleaning effects can be clearly observed in the case of sample 2 after 6 hours at room temperature, in sample 3 after 30 minutes, at 60 ° C, and in sample 4 after 60 minutes at 60 ° C. The air permeability of the endless belt was also measured. Starting at 320 cfm, it increases to 530 cfm in sample 4.

Example 3 Corresponding to the procedure of Example 1, the emulsion M - in an aqueous dilution of 1: 6 parts by weight - was applied to a daily amount of 30 liters within 6 equal time intervals on the endless belt during the production process. The dirty endless tape was cleaned.

Example 4 The emulsion M - after dilution with water at 15% by weight - is applied by means of a spray tube on an endless belt of paper machine, which consists of polyamide and polyester fibers and is contaminated with adhesives and Resins The impurities that adhere to the surface and inside the endless belt are released, so that the water absorption by the endless belt is improved, and the surface of the paper webs is uniformly formed and without defective marks .

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Having described the invention as above, property is claimed as contained in the following

Claims (6)

1. The use of oil-in-water emulsions to treat machines or parts of plants for the manufacture of pulp, paper, cardboard, or paperboard, characterized in that the oil-in-water emulsions are used for cleaning of adherent impurities of synthetic polymers and / or resins natural and / or to prevent contamination by adherent synthetic polymers and natural resins, and because they comprise as component of the oily phase at least one of the following substances, either alone or in mixture with the other indicated substances: i. normal or isomeric saturated or unsaturated hydrocarbon, open chain or cyclic, with 8 to 30 carbon atoms. ii. A saturated or unsaturated fatty alcohol, a saturated or unsaturated fatty acid, a monoalkyl fatty acid ester, a fatty acid amide or a fatty acid monoalkylamide of a saturated or unsaturated fatty acid, all the compounds mentioned under subsection 2 have 8 at 30 carbon atoms. iii. a mono- or polyester of a mono- or multivalent, saturated or unsaturated carboxylic acid with 2 to 30 carbon atoms and polyols with the exception of polyethylene glycols. iv. a polyamide of saturated or unsaturated fatty acids with 8 to 30 carbon atoms, and aliphatic polyamides with 2 to 6 nitrogen atoms. v. an acyclic, preferably monocyclic and / or bicyclic terpene, in particular a terpene hydrocarbon and / or a terpene alcohol and / or vi. a polyoxyalkylene compound based on alkylene oxides.

2. The use of oil-in-water emulsions according to claim 1, characterized in that the adherent synthetic polymers are adhesives and / or latex coating components and / or that the natural resins are modified components or components and processed wood.

3. The use of the oil-in-water emulsions according to claims 1 and 2, characterized in that the parts of the pulp and paper machines, in particular the units serving to drain the pulp suspension, preferably the pulp section. the endless belt and the press section, are the ones that are treated. 4. The use of oil-in-water emulsions according to claims 1 to 3, characterized in that they are used in undiluted form or after dilution with water and / or organic solvents, and because they are applied in an amount of 20 to 500 liters, preferably from 100 to 400 liters per hour and per meter of working width of the machine, either continuously or by dosing at intervals. 5. The use of oil-in-water emulsions according to claim 4, characterized in that they are used in aqueous dilution in a concentration of oil-in-water emulsion of 1-40% by weight, preferably 5-25% by weight, and more preferably 10-25% by weight, relative to the aqueous dilution. 6. The use of oil-in-water emulsions according to claims 1 to 5, characterized in that it is for the production of paper, cardboard, and cardboard, using waste paper. SUMMARY OF THE INVENTION The present invention relates to the use of oil-in-water emulsions to clean machines and parts of plants in the production of pulp, paper, cardboard, and cardboard and to prevent impurities of adhesives and resins adhering to those units. The emulsion comprises as component of the oily phase at least one of the following substances: 1. normal or isomeric saturated or unsaturated hydrocarbon, open chain or cyclic, with 8 to 30 carbon atoms. 2. A saturated or unsaturated fatty alcohol, a saturated or unsaturated fatty acid, a monoalkyl fatty acid ester, a fatty acid amide or a fatty acid monoalkylamide of a saturated or unsaturated fatty acid, all compounds mentioned under 2 they have 8 to 30 carbon atoms. 3. a mono- or polyester of a mono- or multivalent, saturated or unsaturated carboxylic acid with 2 to 30 carbon atoms and polyols with the exception of polyethylene glycols.

4. a polyamide of saturated or unsaturated fatty acids with 8 to 30 carbon atoms, and aliphatic polyamides with 2 to 6 nitrogen atoms.

5. an acyclic, preferably monocyclic and / or bicyclic terpene, in particular a terpene hydrocarbon and / or a terpene alcohol and / or a polyoxyalkylene compound based on alkylene oxides.