Improving retention agent

 

(57) Abstract:

The invention relates to cationic starch amylopectin type added to the original material in paper production for the holding agent. Cationic starch amylopectin type derived from potatoes, modified by genetic engineering to suppress the formation of starch amelonado type. It is dissolved with minimal shear force at a temperature of 60 to 130oWith and preferably added to the original material together with the anionic component. Starch amylopectinosis type contains more than 95% of amylopectin, preferably more than 98% of amylopectin. The technical result is high fixation components in the original mixture in paper production at a satisfactory dehydration and high mechanical strength. 7 C.p. f-crystals.

The invention relates to the use of cationic starch amylopectin type derived from potatoes, as improving retention agent in paper production. More precisely, the invention relates to the use of cationic starch amylopectin type derived from potatoes, modificirovannogo is to increase fixation in paper production. In addition, this invention concerns a complex between the cationic starch amylopectin type and anionic component.

In the paper industry all the great majority of fibers are constantly replaced with cheaper components, such as mineral fillers, such as chalk or clay. The consequence of the higher content of such fillers is that there is a need to use retention system. By definition, the expression "fixation or retention" refers to the proportion of the component present in the original mixture, which remains in the mixture at any stage of the process or in the final product.

In the common use of cationic starch in the paper industry, the starch must be dissolved either through periodic cooking for about 20 minutes at 95oC at a relatively vigorous stirring or by continuous cooking in the so-called jet digester (digester) at 110-130oC. These methods of cooking are required if necessary to dissolve the starch. However, the drawback of these methods of cooking is that they reduce the molecular weight of the starch, which, in the temperature get instead of the solution of the intermediate product between the dispersion and the solution, and in this case the solution contains the remains of swollen granules of starch and/or their fragments. Solutions of starch of this nature lead to significantly degraded dehydration and slower increase of mechanical strength for each amount of starch. Therefore, in the paper industry there is a great need in overcoming these problems.

Known for improving retention agent added to the original material in paper production, which represents a cationic starch with anionic component (WO C-ka 86/00100, class D 21 H 3/28, op. 03.01.1986 year ). However, this technical solution also suffers from the aforementioned disadvantages.

The purpose of this invention is to eliminate the above problems by using a agent that promotes high uderzhivaemoi, satisfactory dehydration and high mechanical strength. This goal is achieved through the use of improving the fixation agent specified in the introduction, types, while the agent detects the properties described in the accompanying claims.

Thus, according to this invention as improving the

The expression "starch amylopectin type" used throughout the text of this application, refers to a starch derived from potatoes, which was modified by genetic engineering to suppress the formation of starch amelonado type. The expression "derivative" refers to the result of chemical, physical and/or by enzymatic derivative of starch amylopectin type. The content of amylopectin in the starch amylopectin type exceeds 95%, preferably greater than 98%. The remaining percentage of the starch amylopectin type accounted for amylose.

Detailed description of starch amylopectin type and its derivatives and methods of their preparation can be found in the Patent application Sweden 9004096-5 (Amylogene HB).

The phrase "improving the fixation agent" is used throughout this application, refers to an agent that, in addition to providing increased uderzhivaemoi also provides improved dehydration and improved the growth performance of mechanical strength in paper production.

Before use in accordance with this invention the starch amylopectin type must be substituted cationic groups by chemical modifications shall also be the primary or tertiary. The chemical composition of the raw materials used in the manufacture of paper, determines the degree of substitution of starch amylopectin type required for optimal results. Thus, the degree of substitution lies between 0.01 and 0.30 (between 0,09 and 2.5%, when calculating properly in relation to nitrogen), preferably between 0.02 and 0.20 (between 0.18 and 1.6%, when calculating properly in relation to nitrogen).

Obtaining cationic starch amylopectin type is important because the solubility curve of starch amylopectin type differs from the solubility curve of conventional starch potatoes. Dissolution of cationic starch amylopectin type should be performed with minimal shear force, through periodic or continuous cooking, temperature limits 60-130oC, preferably in the range of temperatures 65-95oC. This method of dissolution gives the starch solution amylopectinosis type, molecular weight of which is retained, and at the same time, the solution does not contain the swollen granules or their residues. The result is a well-brewed solution having a high fixation and rapid dehydration, despite the lower power supply, is svojstva such cationic starch amylopectinosis add to raw materials with sufficient stirring to ensure good mixing with the raw material before forming the paper. In one embodiment, the present invention cationic starch amylopectin type combined with anionic component, such as colloidal silicic acid, anionic polyacrylamide, and/or benthic, and in this case, these components are added separately with sufficient stirring to ensure that they can communicate and work together with other components of the feedstock.

The amount of these additives required to achieve the desired effect, depend on the composition of the feedstock. Appropriate additions of cationic starch amylopectin type are 1-50 kg/t of paper, preferably 1-20 kg/t of paper.

As mentioned above, the present invention provides significantly improved levels of uderzhivaemoi the added filler, and in relation to small fractions of fibrous material. In addition, it becomes possible to maintain the strength characteristics decorated paper, despite the large number of additions of filler. In addition, periods of dehydration in the wet end of the papermaking machine can be short, despite the fact that starch amylopectin type of restore the major advantage provided by this invention is that it is applicable for all types and quality characteristics of paper and rigid fold increases of products.

Previously it was known the use of cationic starch amylopectin type in paper production, such as starch waxed corn type, but practical tests, which examined the importance of the method of obtaining in combination with the solubility curve of the studied amylopectin showed amazing positive effects, which consists in simultaneously providing high retention, satisfactory dehydration and positive increase of the mechanical strength.

The following detailed examples describe the use of this invention, namely, on the one hand, the use of starch amylopectin type separately (examples 1-3) and, on the other hand, the variant according to which the starch is used together with anionic component (examples 4-6).

Example 1

To assess the effect of cationic starch amylopectin type on the retention of laboratory studies were performed in the so-called device DDA (dynamic Analyzer drainage). Drive% of the fully bleached pulp of soft wood (coniferous) species, rubbed to 25oSR (degree of milling on the instrument shopper-Rigler). To this raw material was added 40% chalk as filler. The pH value of this initial mass brought to 8.2 and the conductivity was measured up to 600 Ás. Before testing the device DDA this original fibrous mass was diluted to a concentration of 2 g/L. For measuring uderzhivaemoi conducted to determine the concentration and ash content in the raw batch, as well as on the water flowing through the mesh. Cationic starch amylopectin type, having a degree of substitution of 0.05, compared with conventional cationic potato starch having the same degree of substitution. Cationic amylopectin and cationic starch was dissolved at several different temperature levels in the range of 60-130oC and quantities were added 2,5, 5,0, 10,0 and 15.0 kg/t respectively. The best options for obtaining and additives respectively cationic starch amylopectin type and cationic potato starch gave improvement in overall retention of approximately 10% and retention of the filler is approximately 40% when using cationic starch amylopectin type.

Example 2

To assess the impact of cationactive (Analyzer dynamic drainage). The cellulose contained in the feedstock, consisting of up to 50% of the fully bleached pulp wood of firm breeds and up to 50% of the fully bleached pulp of softwood, was diluted to 25oSR. This feedstock was added 40% chalk as filler. The pH value of the source material brought to 8.2 and the conductivity was 600 Ás. Before testing the device DDA source material was diluted to a concentration of 2 g/L. Time drainage (dewatering) was measured automatically using the device and the results were recorded in the computer. Cationic starch amylopectin type, having a degree of substitution of 0.05, compared with conventional cationic potato starch having the same degree of substitution. Cationic starch amylopectin type and conventional cationic potato starch was dissolved at several temperature levels within 60-130oC and quantities were added 2,5, 5,0, 10,0 and 15.0 kg/t respectively. Tests have shown that cationic starch amylopectin type, which was dissolved ensuring maximum retention, maintains conditions of rapid dehydration in contrast to conventional cationic starch, colorchange starch amylopectin type feedstock laboratory studies were performed in the device DDA. The cellulose contained in the feedstock, consisting of up to 50% of the fully bleached pulp wood of firm breeds and up to 50% of the fully bleached pulp soft rock, grinded until 25oSR. This source material was added 40% chalk as filler. The pH value of this source material was brought to 8.2 and the conductivity was 600 Ás. Before testing the device DDA source material was diluted to a concentration of 2 g/l of Cationic starch amylopectin type, having a degree of substitution of 0.05, compared with conventional cationic potato starch having the same degree of substitution. Cationic starch amylopectin type and conventional cationic potato starch was dissolved at several temperature levels within 60-130oC and quantities were added 2,5, 5,0, 10,0 and 15.0 kg/t respectively. The number of amylopectin and starch, held in the pulled precipitate on the filter was determined by the method, according to which the analyzed polymer is decomposed to glucose under the action of two enzymes. Then the presence of glucose was determined in the system GHUR. These studies show the value of high viscosity (molecular weight) for a high degree adsorbed, that it can be prepared in such a way that it creates a high retention and provides satisfactory dehydration, but also has significant adsorbiruyuschee.

Example 4

To evaluate interactions between cationic starch amylopectin type and anionic components and effects of the retention of laboratory studies were performed in the device DDA. As the anionic component used colloidal silicic acid. The cellulose contained in the feedstock, consisting of up to 50% of the fully bleached pulp wood of firm breeds and up to 50% of the fully bleached pulp of softwood, grinded until 25oSR. This source material was added 40% chalk as filler. The pH value was brought to 8.2 and the conductivity was 600 Ás. Before testing the device DDA source material was diluted to a concentration of 2 g/L. For measuring retention was determined concentration and ash content supplied the source material, as well as water flowing through a grid. Cationic starch amylopectin type, having a degree of substitution of 0.05, compared with conventional cationic potato starch having Taku is tarali at multiple temperature levels in the range 60-130oC and quantities were added 2,5, 5,0, 10,0 and 15.0 kg/t respectively. Added a sufficient amount of colloidal silicic acid to ensure that the proportion of cationic starch amylopectin type and conventional cationic starch to the colloidal silicic acid is in the range from 1.0:1 to 10:1. The best options for obtaining and additions of cationic starch amylopectin type and conventional cationic potato starch, respectively, and colloidal silicic acid have improved overall retention 25% and retention of the filler is approximately 70% when using cationic starch amylopectin type.

Example 5

To evaluate interactions between cationic starch amylopectin type and anionic components and effects of the retention of laboratory studies were performed in the device DDA. As the anionic component used colloidal silicic acid. The cellulose contained in the feedstock, consisting of up to 50% of the fully bleached pulp wood of firm breeds and up to 50% of the fully bleached pulp of softwood, grinded until 25oRau pH of the source material brought to 8.2 and the conductivity was 600 Ás. Before testing the device DDA source material was diluted to a concentration of 2 g/L. the drainage Time was measured automatically using the device and the results were recorded using a computer. Cationic starch amylopectin type, having a degree of substitution of 0.05, compared with conventional cationic potato starch having the same degree of substitution. Cationic starch amylopectin type and conventional cationic starch was dissolved at several different temperatures in the range 60-130oC and quantities were added 2,5, 5,0, 10,0 and 15.0 kg/t respectively. Added colloidal silicic acid in sufficient quantity to ensure that the proportion of cationic starch amylopectin type and conventional cationic starch to the colloidal silicic acid was in the range from 1.5: 1 to 10:1. These studies have shown that cationic starch amylopectin type by dissolving provides maximum retention, retains the properties of rapid dehydration and also in combination with colloidal silicic acid.

Example 6

To evaluate the adsorption of cationic starch amylopectin type ishodniki anionic component used colloidal silicic acid. To evaluate the adsorption of cationic starch amylopectin type pulp mass laboratory studies were performed in the device DDA. The pulp contained in the base material, consisting of up to 50% of the fully bleached pulp wood of firm breeds and up to 50% of the pulp of softwood, grinded until 25orefining the instrument shopper-Rigler. This source material was added 40% chalk as filler. The pH value of the source material brought to 8.2 and the conductivity was 600 Ás. Before testing the device DDA source material was diluted to a concentration of 2 g/l of Cationic starch amylopectin type, having a degree of substitution of 0.05, compared with conventional cationic potato starch having the same degree of substitution. Cationic starch amylopectin type and conventional cationic starch was dissolved at various temperature levels in the range 60-130oC and quantities were added 2,5, 5,0, 10,0 and 15.0 kg/t respectively. Added colloidal silicic acid in a sufficient amount so that the ratio of cationic starch amylopectin type and conventional cationic starch, respectively, to the colloidal silicon pressed precipitate on the filter of the source material was determined according to the method, according to which these polymers are broken down to glucose under the action of two enzymes. Detection of the presence of glucose was performed then the system GHUR. These studies show the importance of high viscosity (molecular weight) to obtain a high degree of adsorption. Anionic component increases the adsorption of cationic starch amylopectin type to a greater extent than in combination with conventional a cationic starches.

1. Improving retention agent added to the original material in paper production, characterized in that it contains a cationic starch amylopectin type derived from potatoes, modified by genetic engineering to suppress the formation of starch amelonado type, dissolved with minimal shear force at a temperature of 60-130oC and preferably added to the original material together with anionic component.

2. Agent p. 1, characterized in that the starch amylopectin type contains more than 95% of amylopectin, preferably more than 98% of amylopectin.

3. Agent p. 1, characterized in that it contains one or more derivatives of starch amylopectin type poluciaiusheesea fact, the starch amylopectin type or its derivatives are added to the original material in the amount of 1-50, preferably 1-20 kg per 1 ton of produced paper.

5. The agent according to any one of paragraphs.1-4, characterized in that the anionic component is a colloidal silicic acid, anionic polyacrylamide, and/or bentonite.

6. The agent according to any one of paragraphs.1-5, characterized in that before adding starch amylopectin type to source raw materials it replaces the cationic groups by chemical modification of the compound ammonium, preferably a compound of Quaternary ammonium.

7. The agent according to any one of paragraphs.1-6, characterized in that the degree of substitution of cationic amylopectin in the source material is from 0.01 to 0.30, preferably 0,02-0,20.

8. Agent p. 1, characterized in that the starch amylopectin type dissolved with minimal shear force at a temperature of 65-95oC.

 

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FIELD: manufacture of mat from chopped yarns, said mat being used for reinforcement of thermosetting resins.

SUBSTANCE: method involves succession of steps: dispersion of chopped yarns in recycling water, which are dried after gluing through in gluing liquid containing organosilane and film-former; forming web by directing dispersion over molding net through which recycling water flows, with yarns being retained on said net; applying binder and providing thermal processing; obtaining mats of chopped yarns having uniform weight per unit of area, on the total, within the range of 50-1,100 g/m2.

EFFECT: provision for producing of mats having uniform characteristics with minimum amount of elementary filaments.

25 cl, 1 dwg, 2 ex

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