KR930002076B1 - Paper binder making process - Google Patents

Abstract

The polymeric paper-strengthening agent is produced by (a) adding an alkali solution or an organic acid to 250 parts of a formalin to regulate pH at 4-10, (b) adding 15-100 parts of a water- soluble starch to the regulated solution, and reacting the mixture at 50-100 deg.C to regulate pH at 8-10.5, (c) adding 50-100 parts of an urea or a melamine to the regulated solution, and reacting the mixture at 50-100 deg.C for 20-90 min., (d) adding an organic acid to the reactant to regulate pH at 3-6, reacting the mixture for 5-60 min., and then neutralizing it with an alkali solution, and (e) removing a non-reactant. The agent provides a compressive and bursting strength for papers.

Description

Manufacturing method of strength enhancer

The present invention relates to a method of manufacturing an intelligence enhancer capable of imparting bursting strength and compressive strength to a tributary, and more specifically, to transforming starch into a completely water-soluble starch, and then mixing urea or horamarine with nasal The purpose of the present invention is to prepare a force-induced strength of transparent polymer material that is completely water-soluble by polymerizing.

At present, most of the products produced in various production plants are corrugated cardboard boxes made of corrugated sheets or boxes made of maniard cardboard. The bursting strength and the compressive strength must be excellent to withstand the shock and pressure caused by the contents or the external force. Recently, due to the rapid increase in demand of various paper packaging boxes, the number of recycled papers is frequently increased, and the physical properties such as the breaking strength and the compressive strength of paper or paper cartons are extremely weak.

Conventional intellect-strengthening method has a method of pressing the size with starch, but there was a problem that the bursting strength and the compressive strength is weak in the rainy and humid places. In addition, melamine resin, urea resin, polyacrylic resin, epoxy resin, etc. have been used as a moisturizing agent or an intelligence enhancer, but it is not workable, economically disadvantageous, and insufficient to obtain great strength.

The present invention relates to a novel method of manufacturing a strength enhancer that can significantly increase the physical properties such as burst strength and compressive strength compared to the conventional strength enhancer.

In carrying out the method according to the present invention, as a method of breeding starch, which is a main raw material, into fully water-soluble starch, the starch is put in a high pressure part in weak acidity, subjected to separate treatment at a steam pressure of 2-5kg / cm ² or by dipping in diluted hydrochloric acid, and room temperature. It can be obtained by leaving it for several days at room temperature, and starch can be obtained by mixing with dilute aqueous solutions such as ureic acid, glacial acetic acid, calcium hydroxide, sodium hydroxide, ammonium lysate, sodium silicate and sodium aluminate, and stirring separately. In addition, by absorbing the chlorine gas in the starch, it can be obtained by heating or stirring by mixing the inorganic acid solution containing a small amount of chlorine, and further separated by adding aqueous ammonium peroxide solution or perborate solution, and then filtering, washing, It can be obtained by drying process, or by adding aqueous potassium permanganate solution to starch and leaving it for 24-48 hours at room temperature and 14-20 hours at 40 ℃.

The reaction between the fully water-soluble starch obtained by the various methods and the urea or melamine first takes 250 parts of homarinin, and the pH is 4-10 with an alkaline solution such as sodium hydroxide, potassium hydroxide, ammonium hydroxide, glacial acetic acid, acid, and other organic acids. After adding 15-100 parts of water-soluble starch, react at 50 ℃ -100 ℃ until it becomes a completely transparent solution, and then adjust the pH to 8-10.5 and add 50-100 parts of urea or melamine. After reacting for 90 minutes, adjust pH to 3-6 with Uisan, glacial acetic acid, and other organic acids, and react for 5 to 60 minutes. When the polymerization degree is reached, neutralize with alkaline solution, remove unreacted homarinin, and cool. You can get Intellectual Enhancer. In addition to the water-soluble starch obtained by transforming the starch as described above into a completely water-soluble starch, water-soluble starches such as monosaccharides and polysaccharides can also be obtained by reacting with meramine or urea in the presence of homarinin in the same manner as above.

The polymer material obtained as described above is nonionic, and if it is used by cationic cation in various ways, it can be used in the raw material of the papermaking process, which makes paper manufacture more convenient and obtains uniform strength. Therefore, it can be processed by spray and size dressing process. Paper or paperboard treated with strength enhancers in this way can increase 10-80% bursting strength and 10-100% compressive strength.

Example 1

10-20% of the polymer enhancer was used as an aqueous solution, and treated in a condition of pH 5.5 in an amount corresponding to 4% with respect to the paper base paper, and the following results were obtained.

Example 2

10% -20% of the polymer enhancer as an aqueous solution was adjusted to pH 5.5, and then treated in a size press process in an amount corresponding to 3% of the paper base paper.

Example 3

The high-strength enhancer, which is a polymer material, was transformed into a cation type, and 5% of the base paper was added to the base material and treated with aluminum sulphate to pH 5.5.

As shown in the above embodiment, it can be seen that the burst strength and the compressive strength have been significantly increased by treating the strength enhancer prepared according to the present invention, and in particular, by transforming the strength enhancer, which is a nonionic polymer, into cation. It can be seen that a greater effect can be obtained.

Claims (2)

Take 250 parts of homarinin, adjust pH to 4-10 with alkaline solution or organic acid, add 15-100 parts of water-soluble starch, react at 50 ℃ -100 ℃ until complete transparent solution, and adjust pH to 8-10.5 again. 50-100 parts of urea or melamine was added and reacted at 50 ° C.-100 ° C. for 20-90 minutes, and then the pH was adjusted to 3-6 with organic acid for 5 to 60 minutes to neutralize with alkaline solution to remove unreacted hormones. A method for producing an intelligent strength enhancer of a polymeric material, which is obtained by cooling. The method according to claim 1, wherein the water-soluble starch is a monosaccharide or a polysaccharide.