CS220254B1 - Paper size producing method - Google Patents

Abstract

The invention belongs to the field of paper technology. It solves a method of producing a paper sizing agent characterized in that unsaturated pyrolysis fractions and cuts in the range b. v. from 25 °C to 280 °C are copolymerized with maleic anhydride under the catalytic effect of Lewis acids in acids in the presence of alkenes, isoalkenes or mixtures thereof, which contain more than 12 carbon atoms in the chain and further the copolymers are emulsified in water in an amount so that the resulting sizing agents contain 1 to 60% by weight of the copolymer. It is also possible to proceed in such a way that alkenes, isoalkenes or mixtures thereof are added gradually during the reaction.

Description

220254 3 4

BACKGROUND OF THE INVENTION The present invention relates to a process for the manufacture of a paper sizing agent.

Commonly used sizing agents, such as colophony, thallium resin, starch, animal gels, and other natural source materials have been enhanced by the use of synthetic fiber products that meet the needs of the paper industry. In this respect, some non-porous products have been applied and formulations synthesized therefrom.

Typical are low-molecular weight polymers and copolymers of unsaturated hydrocarbons and unsaturated acids such as maleic, fumaric, acrylic, methacrylic, resp. their anhydrides, esters or other derivatives. Depending on the type and monomelic structure of the monomers by polymerization and copolymerization, different structural type composition gels are obtained. While, for example, in the case of the monoolefin C9 fraction, monolithic vinyl polymerization occurs, in the fractions containing certain amounts of conjugated dienes, cyclization occurs in addition to linear polymerization. The course of the cyclization reaction is, besides the composition of the raw material, influenced by the catalytic system, which is usually radical or ionic. The combination of the catalyst composition not only changes the molecular weight distribution of the products, but also gives compounds with different structure-bonding and bonding of the carboxyl groups. The hydrophilicity is important in achieving the gleaming properties and the stability of the aqueous emulsion in which the glue is industrially applied.

These properties are achieved by the process of producing a paper-based glue according to the invention, wherein the fused pyro-lysis fractions and cuts are in the bo-boiling range from 25 ° C to 280 ° C is copolymerized with maleic anhydride under the catalysis of Lewis acids in the presence of dialkylenes, isioalkenes or mixtures thereof containing more than 12 carbon atoms in the chain. Alternatively, the alkenes, isoalkenes, or their esters can be added sequentially during re-operation. Finally, the copolymers prepared are emulsified in water in such a quantity as to result in emulsion and sizing agents. containing 1 to 60% by weight of copolymer. For the preparation of the hydrophilic copolymer products, fractions and cuts can be used in the range of from 25 ° C to-280 ° C resulting from pyrolysis of the enzyme, kerosene, gas oil and other low-pressure pipes. The content of the individual components in the pyrolysis products is markedly influenced by the properties of the final product and, hence, by the efficient and effective sizing agent, they are obtained from the distillate-treated pyrolysis fractions or combinations thereof. Suitable fractions of Cs, Cg, optionally a wide fraction of pyro-lysine gasoline, combinations of these fractions and the like. What is important is that they do not contain water and catalytic poisons that reduce catalyst activity. As catalysts, L-isomers, such as complex compounds BF3, AlCl3, Al3, TiCl3, SnCl3 and the like, can be used.

The positive effect of the alkenes added to the reaction system is noticeably evident in the change in reactivity, but in the influence of the properties of the sizing agent and its easy emulsification in water, and the stability of the emulsions is also increased. Preference is given to using liquid molecular weight polymers of ethylene, propylene, butene or mixtures thereof, which contain from 12 to 70 carbon atoms in the chain, and on average 1 to 1.5 double bonds. Polymerization is carried out at temperatures ranging from -10 ° C to 100 ° C, usually at 20 to 70 ° C. The pressureless treatment is carried out, or only at such pressures to maintain the liquid phase. The catalyst is added sequentially or at certain time intervals. The amount of catalyst is dependent on its activity and the method of preparation and ranges from 0.1 to 8% w / w. For the good conversion of the o-lefin reaction, it takes 1 to 10 hours, preferably 2 to 6 hours. The polymerization process can be carried out continuously or discontinuously. The products of copolymerization of olefinic hydrogen hydrogens with maleic anhydride after removal of unreacted hydrocarbons and catalyst are well water-emulsifiable, it is easy to prepare stably emulsions in the form of paper glues.

The subject matter of the invention is illustrated by the n-and exemplified embodiments. Example 1

1350 g of pyrolysis-gasoline with a density of 0.859 kg were weighed into a 2 l stirred reactor. m-3, with a pith number of 20.1, beginning with a distillation of 218 ° C, to which 35 g of maleic anhydride and 50 g of oligomers of ethyl-ene boiling in the boiling range of 210 to 2.40 ° C were added . After dissolution of the maleic anhydride and heating of the reaction mixture n, and a temperature of 58 ° C. Celsius s, and to the reactor was added as a catalyst a boron trifluoromethyl ether such that the total amount of 13 ml was added over 2 hours. After 3 hours, the reaction was quenched by addition and after removal of the catalyst, unreacted hydrocarbons were distilled off. 417 g of a copolymer were obtained, from which a sizing solution with an efficiency of 19.8 g / m 2 was obtained according to the Cob-beo method. Example 2

The mixture consists of 1250 g of pyrolysis benzene, the same composition as in Example 1, and 150 g of oligomer fraction of propylene, 0.77 kg. m-3, an average molecular weight of 182 and a bromine number of 77 was co-polymerized with 25 g of maleic anhydride at 60 ° C for 5 hours. Catalytic converter

Claims (2)

220254 was a complex of AlCl 3 with ethyl chloride in a toluene holder of 530 mg AlCl 3 in 1 ml of the solution was added in 20 min. intervals during the first three hours. 20 ml of catalyst was used for the reaction. The reaction afforded 368 g of a copolymer with a 23.9 g / m 2 gelling agent by Coibb60. Example 3 The procedure and reaction conditions were the same as in Example 2, but the reaction was carried out in the absence of isoalkenes. After 6 hours, 346 g of product were obtained, having an aqueous solution having a sizing efficiency of 68 gm-2 according to Oobbeo and very low stability of the emulsion. EXAMPLE 4 970 g of a pyrolysis gasoline fraction boiling in the boiling range of 89 DEG to 237 DEG C. were mixed with 300 g of a C5 fraction containing 22.1 wt. cyclopentadiene and 35 grams of a propylene oil of average molecular weight of 360. 45 grams of maleic anhydride were added to the mixture at 20 [deg.] C. and, after dissolution, a catalyst of 31.3 wt.% was added in portions at 15 minute intervals. AlCl 3 in a mixture of poly-alkylbenzenes and chloroalkanes. A total of 45 ml was added over 3 hours. Thereafter, the temperature of the reaction mixture was raised to 68 ° C and allowed to stir for a further 4 hours. After working up, 297 g of a copolymer of good emulsifiable viola was obtained. The sizing efficiency of the Cobb60 method is 26.1 gm-2. EXAMPLE 5 A 30 liter reactor with a denier of 19.52, a density of 0.847 kg was charged into a 50 L reactor. m < 3 >, at the beginning of distillation of 63 [deg.] C. and the end of distillation of 239 [deg.] C. and 5 [mu] l of polypropylene oil, boiling in the temperature range of 165 to 290 [deg.] C. 875 g of maleic anhydride were added with stirring and the whole was heated to 55 [deg.] C Over a period of 2 hours, 500 ml of catalyst was added as well as in Example 2. After six hours, the reaction was stopped and the mixture was worked up as described above, yielding 10.5 kilograms of solid product. 1. A process for preparing papermaking glue, characterized in that unsaturated pyrolysis fractions and sections in the tv range of 25 ° C to 280 ° C are copolymerized with maleic anhydride under the catalytic action of Lewis acids in the presence of alkenes, isoalkene or mixtures thereof that contain more than one chain in the chain. more than 12 carbon atoms and furthermore, the copolymers are emulsified in water at a rate such that the resulting emulsion of the sizing agent contains 1-60% by weight of the copolymer. 2. A process according to claim 1, wherein the alkenes, the isoalkenes or their mixtures are added sequentially during the reaction.