CZ3220U1 - Auxiliary starch-based composition for surface treatment - Google Patents

Description

Technical field

The technical solution is concerned. means for surface refinement of fleece, in particular paper, cardboard and paperboard, which is applied to the surface in sizing presses, decorators or other conventional equipment.

The aim of surface treatment of papers, cartons and boards is to improve their surface properties, such as increasing surface strength, reducing powder, improving printability and, on the other hand, mechanical-physical properties, such as increasing stiffness, strength, increased compressive strength, tensile strength and elongation.

z the increase in v strength

Background Art

Acting is used for surface refinement; degraded starch, usually oxidatively degraded starch, and native starch, which is degraded prior to application. Known, however, is the use of native starch. Starch is always heat treated before surface application, starch oil is diluted to the surface with water, and the disadvantage of native starch is that it produces a high-viscosity starch, so it can only be applied, only very thinly - about 1 to 2% fvaJ. . Thereby it does not allow sufficient nanosupply to the surface and thus reach the required parameters. Therefore, almost always, degraded starch is used, ie a starch with a reduced average which makes it possible to apply a polymeric degree of concentration of 5 to 10% (-year p-1).

not common SI;

potato starch. It is then applied to the application of the application, which is applied to approximately the V-VTA-V applied in the sizing presses on the paper bed. Full oxidized starch satisfies the quality side, but its disadvantage is the high cost, which increases production costs non-costly. For this reason, its production capacity is not being considered for its application.

In industrialized countries, native starch is used for surface finishing of paper, cardboard and cardboard, and is degraded on site. Degradation is essentially carried out in two ways, thermochemically and enzymatically. The difference between these methods is that if the mechanism is eliminated, there is a difference in the investment costs of the degradation device, the different material costs of the process, and in part the quality of the degraded starch, respectively. starch oil. EnzymsticX is provided with significantly lower investment costs and relatively low cost of enzyme degraded starch suitable for all production assortment - paper, cardboard, cardboard, textile ad. Its disadvantage is the high investment costs of machinery and the considerable system sensitivity requiring high technological discipline. It is based on the largest production capacities. The equipment for thermochemical degradation is cheaper than the oxidizing agent of the degraded starch is all the packaging mat. Cely Ξ t VEík

sysie.m is a manufacturing nymph, quality suitable for less demanding.

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Network H

Principle of technical solution

The disadvantages of the aforementioned methods reside in a starch-based auxiliary chemistry for the treatment of fibrous fibers in sizing presses which is heat-treated prior to application and which consists in a mixture of native starch and oxidizing agent (s) that are activated tepelnvm treating this .____ after- wards bvwe-hipl MIIM +?)% / reluctant / oxidizing agent at a temperature of 90 to 145 ° C immediately prior to its application and comprises 0 to _y 1

Reagents, 3 to 30% / bucket o 'yy / free or bound water and 65 to VlvuobtetWm

96, 9% nati-f Starch.

The advantage of this device is that it allows a further reduction in the investment costs of the degradation device. Degradation occurs on conventional continuous digesters that are used to cook another Starch,. usually cationic starch. With a smaller investment, this reboiler can be adapted for combined cooking. At the same time, the cost of acquiring a new digester is considerably lower than the cost of thermochemical degradation of Starch. An important advantage is also the higher reliability of the preparation of degraded starch, as the dosage of oxidizing agent is not poor. The solution combines the advantages of using degraded starches, the least demanding of thermal preparation, but too expensive and low prices of native starches degraded immediately prior to their application. The efficiency of surface improvement enhancement can be increased by assembling a surface-enhancing aid for the inorganic pigment in an amount of 0.1 to 15.

In order to prevent the starch suspension from being introduced into the assembly, the biocide is added in an amount of 10 relative to native starch.

or is preferably up to 300 ppm,

EXAMPLES Example 1: Eccentric Agent for Surface Finishes, ίί-/ / / / Potato Starch, Fine A Type,

0.35% by weight ammonium persulfate, the remainder to 100 water. Prost redek., - · '' - ^ /: ^: ^^ 1./^-4.1..^,..-.-4.-. '· / -: ·'

-4-.

a continuous jet cooker at 130 ° C. At the same time, degradation occurs during cooking. After cooking, the composition is diluted to 8% by weight relative to the native pot and pumped into a storage tank, which is then pumped into the size press (resp. into the working tank of the size press.

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The viscosity of the 8% starch lubricant is less than 80 mPas at 60 ° C.

AND

Auxiliary

Claims (1)

PROTECTION chemical agent based Starch for surface treatment of fibrous or other equipment, applying a surface-embossed web in germinating presses, which is thermally, by the fact that native starch and oxidizing agent, phed itself, is processed by a mixture Or oxidizing agents which are activated by heat treatment at a temperature of 90-145 ° C immediately prior _to application, comprising 0.1 to 5.0% by weight of oxidizing agent and 3 to 5% by weight of oxidizing agent. , 30% by weight of free and bound dyestuff and%% by weight of absolutely dry native starch. Auxiliary C hemi c a c t tre according to claim Characterized in that it contains from 0.1 to 15% by weight of organic or inorganic pigment wetted by a coating composition: 0 1 1 1 1 b b C. C.. and