CN101760149A - Environmental-friendly amylopectin composite adhesive for paper products and production method thereof - Google Patents
Environmental-friendly amylopectin composite adhesive for paper products and production method thereof Download PDFInfo
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Abstract
The invention discloses an environmental-friendly amylopectin composite adhesive for paper products and a production method thereof. The composite adhesive is prepared by oxidizing, cross-linking, etherifying and pasting starch to generate a modified starch adhesive, modifying polyvinyl alcohol to be used as a reinforcing agent, adding a preserving agent and a drier, and compounding. The environmental-friendly amylopectin composite adhesive for the paper product has strong initial adhesion and adhesive force, high-speed drying, fast natural air-drying without the phenomenon of wire drawing, corrugation deviation, corrugation-collapse, and the like, favorable cardboard hardness and stiffness, and has no efforescence, and does not absorb moisture. The invention is applied to the glue for producing three domestic corrugated boards and applied to the glue for various paper barrels, paper tubes, cement bag papers, furniture and interior decorations.
Description
Technical field:
The invention belongs to the adhesive technology field, relating to a kind of is the paper product composite adhesive and the production method thereof of raw material with starch.
Background technology:
The glue paste that corrugated cardboard is used after banning use of water glass adhesive, is developed the various starch adhesives that are applied to corrugated board production in succession.Mainly containing ative starch and Sumstar 190 and various auxiliary agent is mixed into glue, is that linking agent is made with the borax.Such starch adhesive often occurs when producing corrugated cardboard: open the limit behind 1. gelling wire drawing, the glue, collapse stupefied distortion or corrugated cardboard shrink reveal stupefied, run stupefied; 2. the deflection of fluting board and difference of hardness are difficult for natural air drying, easily the accumulation of salt in the surface soil, the moisture absorption etc.; 3. the tackiness agent storage time short, apt to deteriorate and turn sour, smelly; 4. operational requirement height, difficulty are big, and the producer that lacks drying plant is difficult to use; 5. yield poorly, the cost height.
China produces the producer of corrugated cardboard at present, mainly contains three types: a kind of is corrugated cardboard continuous production streamline, and its used tackiness agent is the carrier glue of giving birth to starch and the gelatinization of auxiliary agent mixing portion, and gluing is pasted into type through high temperature hot pressing on cardboard; Another kind is a small-sized carton producer, generally adopts single-side machine to produce corrugated cardboard, used glue be gelatinization, have better bonding force and a mobile oxidized starch glue, applying glue on cardboard through colding pressing and the natural air drying moulding; The semi continuous production that the third is made up of single-side machine, its used glue is identical with glue with single-side machine production.More than the production of three types of corrugated cardboards be starch or Sumstar 190 adding assistant with glue, have all that the starch consumption is big, production cost is high, energy consumption is high, product performance are unstable, the fluting board product can not natural-wind dry, difference of hardness, the easily accumulation of salt in the surface soil, easy defective such as the moisture absorption.
Summary of the invention:
The objective of the invention is that the starch consumption that exists at existing starch adhesive is big, energy consumption is high, product performance are unstable and the fluting board product is difficult for natural-wind dry, difference of hardness, the easily accumulation of salt in the surface soil, easy technical problem such as the moisture absorption, a kind of composite adhesive product and production method thereof are provided.
Technical scheme of the present invention is: by adopting excessive urea as de-aldehyde agent, remove unnecessary free formaldehyde, remove murder by poisoning, and generate Precondensed UreaFormaldehyde Resin, strengthen the bonding force and the water resistance of starch adhesive.Again polyvinyl alcohol is made cyclization, obtain water-fast six-ring compound, improve the bonding force and the water resistance of product.Add sanitas, siccative at last, compoundly obtain a kind of contained free formaldehyde and reach GB and allow environmental-friendly amylopectin composite adhesive for paper products below 0.8%.
The present invention is achieved in that
Environmental-friendly amylopectin composite adhesive for paper products and production method thereof are with starch oxidation, crosslinked, etherificate, gelatinization, generate the modified starch tackiness agent, and polyvinyl alcohol is carried out modification as toughener, add sanitas again, siccative is composited.Use comprises the raw material of following parts by weight:
90～110 parts of starch; 2～9 parts in oxygenant; 2～9 parts of oxidation terminators; 1～10 part of linking agent; 2～20 parts of linking agent terminators; 1～9 part of etherifying agent; 2.5～5 parts of paste agents; 5～15 parts of tougheners; 1～5 part of cyclizing agent; 1～3 part of sanitas; 10～20 parts of siccative; The PH conditioning agent is by technology pH value required amount; 500～750 parts in water.
Described starch comprises potato starch and cereal starch, and preferably tapioca (flour), W-Gum or sorghum starch can use wherein one or more kinds of mixtures.
Described oxygenant comprises wherein a kind of or two kinds mixture of hydrogen peroxide, clorox.
Described oxidation terminator comprises wherein a kind of or more than one mixture of S-WAT, sodium thionyl, Sulfothiorine.
Described linking agent comprises formaldehyde, epoxy chloropropane.
Described complexing agent and linking agent terminator comprise urea.
Described etherifying agent comprises monochloroacetic acid, sodium monochloracetate.
Described toughener comprises polyvinyl alcohol.
Described cyclizing agent comprises urea.
Described sanitas comprises wherein a kind of or more than one mixture of zinc sulfate, zinc chloride and Sodium Benzoate.
Described siccative comprises wherein a kind of or two kinds mixture of wilkinite, bentonite.
The production method of environmental-friendly amylopectin composite adhesive for paper products of the present invention, its processing step is:
(1) preparation of starch suspension: earlier water is placed reactor for 200～300 parts, start agitator, in 90～110 parts of adding reactors of starch, stir and make 30% starch suspension;
(2) oxidizing reaction: in starch suspension, add 2～9 parts in oxygenant, starch is carried out oxidizing reaction, behind the Sumstar 190 that obtains expecting, add 2～9 parts of oxidation terminators, stop oxidizing reaction, through leaving standstill, filtering, washing adds water and makes 30% Sumstar 190 suspension again;
(3) crosslinking reaction: in above-mentioned (2) Sumstar 190 suspension, regulate PH1.5～2 with mineral acid, add 1～10 part of linking agent again, add 2～20 parts of complexing agent and cyclizing agents then, make Sumstar 190 carry out crosslinked complex reaction, improve the water resistance and the bonding force of starch adhesive, described mineral acid is sulfuric acid, hydrochloric acid, phosphoric acid or nitric acid;
(4) etherification reaction: starch reaction liquid pH12～13 of regulating above-mentioned (3) with mineral alkali, add 1～9 part of etherifying agent again, reaction generates oxidation-crosslinked-etherification starch, the back adds paste agent and carries out gelatinization for 2.5～5 parts, promptly obtain the starch adhesive major ingredient, described mineral alkali is sodium hydroxide or potassium hydroxide;
(5) preparation of auxiliary material: in another container, add 5～15 parts of remainder water and tougheners, stir, under 90 ℃ temperature condition, allow toughener fully dissolve, and add 1～5 part of cyclizing agent, reaction generates the six-ring complex compound, improve the water resistance of auxiliary material, add 1～3 part of sanitas then, 10～20 parts of siccative stir;
(6) major ingredient mixes with auxiliary material: auxiliary material is added in the major ingredient reactor, mix, and regulate PH7.5～7.8 with the aqueous citric acid solution of conditioning agent 5～20%, promptly obtain environmental-friendly amylopectin composite adhesive for paper products.
Advantage of the present invention and positively effect:
1, the present invention removes unnecessary free formaldehyde by adopting excessive urea as de-aldehyde agent, removes murder by poisoning, and generates Precondensed UreaFormaldehyde Resin, can also strengthen the bonding force and the water resistance of starch adhesive simultaneously.Again polyvinyl alcohol is made cyclization, obtain water-fast six-ring compound, improve the bonding force and the water resistance of product.Add at last that sanitas, siccative are compound to be obtained a kind of contained free formaldehyde and reach GB and allow environmental-friendly amylopectin composite adhesive for paper products below 0.8%.
2, environmental-friendly amylopectin composite adhesive for paper products of the present invention and production method thereof, raw material is easy to get, output height, production cost are low, steady quality, odorless, tasteless is nontoxic, the storage time is long; Technological operation is easy, and the no three wastes produce, easily suitability for industrialized production.
3, the initial bonding strength of product of the present invention and bonding force are done by force, fast, natural air drying is fast, no wire drawing, race are stupefied, the phenomenon such as stupefied of collapsing, and the hardness of cardboard and deflection be good, the accumulation of salt in the surface soil, nonhygroscopic not, is a kind of environmental-friendly amylopectin composite adhesive for paper products.Be applicable to the production glue of domestic three kinds of corrugated cardboards, also be applicable to the glue of using of various paper buckets, paper tube, cement bag paper, furniture and interior decoration.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Description of drawings:
Fig. 1 is the technological process of production synoptic diagram of composite adhesive
Embodiment:
The described content of following embodiment only is the basic explanation of the present invention under conceiving, and according to the equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Embodiment 1:
1, prescription:
100 parts of tapioca (flour)s, 6 parts of oxidant hydrogen peroxide, 3 parts of oxidation terminator S-WATs, 4 parts in linking agent formaldehyde, 8 parts in complexing de-aldehyde agent and cyclizing agent urea, 5 parts of etherifying agent monochloroacetic acids, 3.5 parts in paste agent sodium hydroxide, 6 parts of toughener polyvinyl alcohol, 2 parts in sanitas zinc sulfate, 10 parts of siccative wilkinites, PH conditioning agent sulfuric acid, sodium hydroxide are by technology pH value required amount, 700 parts in water.
2, preparation technology:
Earlier water is placed reactor for 230 parts, start agitator,, add in the reactor, stir and make 30% starch suspension 100 parts of tapioca (flour)s.
In starch suspension, add 6 parts of oxidant hydrogen peroxide, starch is carried out oxidizing reaction, behind the Sumstar 190 that obtains expecting, after add 3 parts of oxidation terminator S-WATs, stop oxidizing reaction, standing over night, remove mother liquor, washing, add water and make 30% Sumstar 190 suspension again.
In above-mentioned Sumstar 190 suspension, the aqueous sulfuric acid of adding 10%, regulate PH2, add 4 parts in linking agent formaldehyde again, add 6 parts in complexing agent and de-aldehyde agent urea then, make Sumstar 190 carry out crosslinking reaction, with unnecessary linking agent formaldehyde reaction generation resin adhesive, remove unnecessary formaldehyde, improved water resistance, the bonding force of starch adhesive.
The aqueous sodium hydroxide solution of use 10% is regulated PH12 with the reaction solution of above-mentioned starch-resin cross-linked rubber stick, adds 5 parts of etherifying agent monochloroacetic acids again, and reaction generates oxidation-crosslinked-etherification starch.Add paste agent sodium hydroxide again and carry out gelatinization for 3.5 parts, promptly obtain the starch adhesive major ingredient.
In another container that can heat, add 6 parts of remainder water, toughener polyvinyl alcohol, stir, under 90 ℃ temperature condition, allow the toughener polyvinyl alcohol fully dissolve, and adding 2 parts in remaining urea, reaction generates the six-ring complex compound, improves the water resistance of auxiliary material.Add 2 parts in 2 sanitas zinc sulfate, 10 parts of siccative wilkinites then, stir and make auxiliary material.
Auxiliary material is added in the major ingredient reactor, mix, and regulate PH7.5, promptly obtain a kind of low cost, high-performance paper product environmental protection amylopectin composite adhesive with the aqueous citric acid solution of conditioning agent 20%.
This product odorless, tasteless is nontoxic, the storage time is long, initial bonding strength and bonding force are done by force, fast, natural air drying is fast, no wire drawing, race are stupefied, the phenomenon such as stupefied of collapsing, and cardboard is nonhygroscopic, the accumulation of salt in the surface soil, hardness and deflection are not good.
Embodiment 2:
1, prescription:
110 parts of W-Gums, 3 parts of oxygenant clorox, 2.5 parts of oxidation terminator S-WATs, 6 parts in linking agent formaldehyde, 9 parts in complexing de-aldehyde agent and cyclizing agent urea, 7 parts of etherifying agent monochloroacetic acids, 4 parts in paste agent sodium hydroxide, 10 parts of toughener polyvinyl alcohol, 2.5 parts in sanitas zinc sulfate, 15 parts of siccative wilkinites, PH conditioning agent hydrochloric acid, sodium hydroxide are by technology pH value required amount, 750 parts in water.
2, preparation technology:
Earlier water is placed reactor for 250 parts, start agitator, in 110 parts of adding reactors of W-Gum, stir and make 30% starch suspension.
In starch suspension, add 3 parts of oxygenant clorox, starch is carried out oxidizing reaction, behind the Sumstar 190 that obtains expecting, after add 2.5 parts of oxidation terminator S-WATs, do and mix even termination oxidizing reaction, standing over night is removed mother liquor, washing, adds water and makes 30% Sumstar 190 suspension again.
In above-mentioned Sumstar 190 suspension, the aqueous hydrochloric acid of adding 10% is regulated PH1.5, add 6 parts in linking agent formaldehyde again, add 6 parts in complexing agent and de-aldehyde agent urea then, make Sumstar 190 carry out crosslinked complex reaction, and generate resin adhesive with unnecessary linking agent formaldehyde reaction, and remove unnecessary formaldehyde, improved water resistance, the bonding force of starch adhesive.
Aqueous sodium hydroxide solution with 10% is regulated PH12 with above-mentioned starch-resin cross-linked rubber stick reaction solution, adds 7 parts of etherifying agent monochloroacetic acids again, and reaction generates oxidation-crosslinked-etherificate powder.Add paste agent sodium hydroxide again and carry out gelatinization for 4 parts, promptly obtain the starch adhesive major ingredient.
In another container that can heat, add 10 parts of remainder water, toughener polyvinyl alcohol, stir, under 90 ℃ temperature condition, allow the toughener polyvinyl alcohol fully dissolve, and adding 3 parts in remaining urea, reaction generates the six-ring complex compound, improves the water resistance of auxiliary material.2.5 parts in sanitas zinc sulfate, 15 parts of siccative wilkinites stir and make auxiliary material then.
Auxiliary material is added in the major ingredient reactor, mix, and regulate PH7.8, promptly obtain a kind of low cost, high-performance paper product environmental protection amylopectin composite adhesive with the aqueous citric acid solution of conditioning agent 18%.
This product odorless, tasteless is nontoxic, the storage time is long, initial bonding strength and bonding force are done by force, fast, natural air drying is fast, no wire drawing, race are stupefied, the phenomenon such as stupefied of collapsing, and cardboard is nonhygroscopic, the accumulation of salt in the surface soil, hardness and deflection are not good.
Embodiment 3:
1, prescription:
70 parts of Semen Maydis powder starch, 40 parts of sorghum starches, 8 parts of oxygenant clorox, 6 parts in oxidation terminator Sulfothiorine, 5 parts of linking agent epoxy chloropropane, 4 parts of etherifying agent monochloroacetic acids, 5 parts in paste agent sodium hydroxide, 7 parts of toughener polyvinyl alcohol, 2.5 parts in cyclizing agent urea, 3 parts in sanitas zinc sulfate, 10 parts of stablizer wilkinites, 10 parts of bentonite, PH conditioning agent sulfuric acid, sodium hydroxide are by technology pH value required amount, 750 parts in water.
2, preparation technology:
Earlier water is placed reactor for 250 parts, start to do and mix device, in 70 parts of Semen Maydis powder starch, 40 parts of adding reactors of high grain starch, do mixing 30% starch suspension.
In starch suspension, add 8 parts of oxygenant clorox, starch is carried out oxidizing reaction, behind the Sumstar 190 that obtains expecting, the back adds 6 parts in oxidation terminator Sulfothiorine, do and mix even termination oxidizing reaction, standing over night is removed mother liquor, washing, adds water and makes 30% Sumstar 190 suspension again.
In above-mentioned Sumstar 190 suspension, add 10% aqueous sodium hydroxide solution adjusting PH9～12, add 5 parts of linking agent epoxy chloropropane again, make Sumstar 190 carry out crosslinked complex reaction, improved water resistance, the bonding force of starch adhesive.
Aqueous sodium hydroxide solution with 10% is regulated PH12.5 with above-mentioned starch-resin cross-linked rubber stick reaction solution, adds 4 parts of etherifying agent monochloroacetic acids again, and reaction generates oxidation-crosslinked-etherificate powder.Add paste agent sodium hydroxide again and carry out gelatinization for 5 parts, promptly obtain the starch adhesive major ingredient.
In another container that can heat, add 7 parts of remainder water, toughener polyvinyl alcohol, stir, under 90 ℃ temperature condition, allow the toughener polyvinyl alcohol fully dissolve, and adding 2.5 parts in cyclizing agent urea, reaction generates the six-ring complex compound, improves the water resistance of auxiliary material.3 parts in the sanitas zinc sulfate of Jia Ruing, 10 parts of siccative wilkinites, 10 parts of bentonite stir and make auxiliary material then.
Auxiliary material is added in the major ingredient reactor, mix, and regulate PH7.6, promptly obtain a kind of low cost, high-performance paper product environmental protection amylopectin composite adhesive with the aqueous citric acid solution of conditioning agent 6%.
This product odorless, tasteless is nontoxic, the storage time is long, initial bonding strength and bonding force are done by force, fast, natural air drying is fast, no wire drawing, race are stupefied, the phenomenon such as stupefied of collapsing, and cardboard is nonhygroscopic, the accumulation of salt in the surface soil, hardness and deflection are not good.
Embodiment 4:
1, prescription:
80 parts of Tapioca Starch starch, 30 parts of high grain starch, 5.5 parts of oxygenant clorox, 5.5 parts of oxidation terminator S-WATs, 8 parts in linking agent formaldehyde, 14 parts in complexing de-aldehyde agent and cyclizing agent urea, 6 parts of etherifying agent monochloroacetic acids, 4.5 parts in paste agent potassium hydroxide, 12 parts of toughener polyvinyl alcohol, 2.5 parts in sanitas zinc sulfate, 18 parts of siccative wilkinites, PH conditioning agent sulfuric acid, potassium hydroxide are by technology pH value required amount, 750 parts in water.
2, preparation technology:
Earlier water being placed reactor for 250 parts, start agitator, is 80 parts with Tapioca Starch starch, and in 30 parts of adding reactors of high grain starch, stirring becomes 30% starch suspension.
In starch suspension, add 5.5 parts of oxygenant clorox, starch is carried out oxidizing reaction, behind the Sumstar 190 that obtains expecting, after add 5.5 parts of oxidation terminator S-WATs, do and mix even termination oxidizing reaction, standing over night is removed mother liquor, washing, adds water and makes 30% Sumstar 190 suspension again.
In above-mentioned Sumstar 190 suspension, the aqueous sulfuric acid of adding 6%, regulate PH2, add 8 parts in linking agent formaldehyde again, add 9 parts in complexing agent and de-aldehyde agent urea then, make Sumstar 190 carry out crosslinked complex reaction, and generate resin adhesive with the reaction of unnecessary linking agent, and remove unnecessary linking agent, improved water resistance, the bonding force of starch adhesive.
Potassium hydroxide aqueous solution with 15% is regulated PH13 with above-mentioned starch-resin cross-linked rubber stick reaction solution, adds 6 parts of etherifying agent monochloroacetic acids again, and reaction generates oxidation-crosslinked-etherification starch.Add paste agent potassium hydroxide again and carry out gelatinization for 4.5 parts, promptly obtain the starch adhesive major ingredient.
Add 12 parts of remainder water and tougheners in another container that can heat, stir, under 90 ℃ temperature condition, allow toughener fully dissolve, and add 6 parts in remaining urea, reaction generates the six-ring complex compound, improves the water resistance of auxiliary material.Add 2.5 parts in sanitas zinc sulfate, 18 parts of siccative wilkinites then, stir and make auxiliary material.
Auxiliary material is added in the major ingredient reactor, mix, and regulate PH7.7, promptly obtain a kind of low cost, high-performance paper product environmental protection amylopectin composite adhesive with the aqueous citric acid solution of conditioning agent 20%.
This product odorless, tasteless is nontoxic, the storage time is long, initial bonding strength and bonding force are done by force, fast, natural air drying is fast, no wire drawing, race are stupefied, the phenomenon such as stupefied of collapsing, and cardboard is nonhygroscopic, the accumulation of salt in the surface soil, hardness and deflection are not good.
Embodiment 5:
1, prescription:
50 parts of Tapioca Starch starch, 50 parts of W-Gums, 7 parts of oxidant hydrogen peroxide, 5 parts of oxidation terminator S-WATs, 9 parts in linking agent formaldehyde, 15 parts in complexing de-aldehyde agent and cyclizing agent urea, 8 parts of etherifying agent monochloroacetic acids, 5 parts in paste agent potassium hydroxide, 8 parts of toughener polyvinyl alcohol, 2.5 parts in sanitas zinc sulfate, 18 parts of siccative wilkinites, PH conditioning agent sulfuric acid, potassium hydroxide are by technology pH value required amount, 750 parts in water.
2, preparation technology:
Earlier water being placed reactor for 230 parts, start agitator, is 50 parts with Tapioca Starch starch, and 50 parts of W-Gums add in the reactor, and stirring becomes 30% starch suspension.
In starch suspension, add 7 parts of oxidant hydrogen peroxide, starch is carried out oxidizing reaction, behind the Sumstar 190 that obtains expecting, after add 5.5 parts of oxidation terminator S-WATs, the termination oxidizing reaction that stirs, standing over night, remove mother liquor, washing, add water and make 30% Sumstar 190 suspension again.
In above-mentioned Sumstar 190 suspension, the aqueous sulfuric acid of adding 6%, regulate PH2, add 8 parts in linking agent formaldehyde again, add 9 parts in complexing agent and de-aldehyde agent urea then, make Sumstar 190 carry out crosslinked complex reaction, and generate resin adhesive with the reaction of unnecessary linking agent, and remove unnecessary linking agent, improved water resistance, the bonding force of starch adhesive.
Potassium hydroxide aqueous solution with 15% is regulated PH13 with above-mentioned starch-resin cross-linked rubber stick reaction solution, adds 8 parts of etherifying agent monochloroacetic acids again, and reaction generates oxidation-crosslinked-etherification starch.Add paste agent potassium hydroxide again and carry out gelatinization for 5 parts, promptly obtain the starch adhesive major ingredient.
Add 8 parts of remainder water and tougheners in another container that can heat, stir, under 90 ℃ temperature condition, allow toughener fully dissolve, and add 6 parts in remaining urea, reaction generates the six-ring complex compound, improves the water resistance of auxiliary material.Add 3 parts in sanitas zinc sulfate, 16 parts of siccative bentonite then, stir and make auxiliary material.
Auxiliary material is added in the major ingredient reactor, mix, and regulate PH7.7, promptly obtain a kind of low cost, high-performance paper product environmental protection amylopectin composite adhesive with the aqueous citric acid solution of conditioning agent 20%.
This product odorless, tasteless is nontoxic, the storage time is long, initial bonding strength and bonding force are done by force, fast, natural air drying is fast, no wire drawing, race are stupefied, the phenomenon such as stupefied of collapsing, and cardboard is nonhygroscopic, the accumulation of salt in the surface soil, hardness and deflection are not good.
Claims (3)
1. environmental-friendly amylopectin composite adhesive for paper products, it is characterized in that: it comprises the raw material of following parts by weight:
90～110 parts of starch, 2～9 parts in oxygenant, 2～9 parts of oxidation terminators, 1～10 part of linking agent, 2～20 parts of linking agent terminators, 1～9 part of etherifying agent, 2.5～5 parts of paste agents, 5～15 parts of tougheners, 1～5 part of cyclizing agent, 1～3 part of sanitas, 10～20 parts of siccative, 500～750 parts in water.
2. environmental-friendly amylopectin composite adhesive for paper products as claimed in claim 1 is characterized in that:
(1) described starch is potato starch and cereal starch, is one or more kinds of mixtures;
(2) described oxygenant is wherein a kind of or both mixture of hydrogen peroxide or clorox;
(3) described oxidation terminator comprises wherein a kind of or more than one mixture of S-WAT, sodium thionyl, Sulfothiorine;
(4) described linking agent is formaldehyde or epoxy chloropropane;
(5) described etherifying agent is monochloroacetic acid or sodium monochloracetate;
(6) described toughener is a polyvinyl alcohol;
(7) described cyclizing agent is a urea;
(8) described sanitas is wherein one or more a mixture of zinc sulfate, zinc chloride and Sodium Benzoate;
(9) described siccative is wherein a kind of or both mixture of wilkinite or bentonite.
3. the production method of composite adhesive as claimed in claim 1, it is characterized in that: processing step is:
(1) preparation of starch suspension: earlier water is placed reactor for 200～300 parts, start agitator, in 90～110 parts of adding reactors of starch, stir and make 30% starch suspension;
(2) oxidizing reaction: in starch suspension, add 2～9 parts in oxygenant, starch is carried out oxidizing reaction, behind the Sumstar 190 that obtains expecting, add 2～9 parts of oxidation terminators, stop oxidizing reaction, through leaving standstill, filtering, washing adds water and makes 30% Sumstar 190 suspension again;
(3) crosslinking reaction: in above-mentioned (2) Sumstar 190 suspension, regulate PH1.5～2 with mineral acid, add 1～10 part of linking agent again, add 2～20 parts of complexing agent and cyclizing agents then, make Sumstar 190 carry out crosslinked complex reaction, improve the water resistance and the bonding force of starch adhesive, described mineral acid is sulfuric acid, hydrochloric acid, phosphoric acid or nitric acid;
(4) etherification reaction: the starch reaction liquid pH 12～13 that regulates above-mentioned (3) with mineral alkali, add 1～9 part of etherifying agent again, reaction generates oxidation-crosslinked-etherification starch, the back adds paste agent and carries out gelatinization for 2.5～5 parts, promptly obtain the starch adhesive major ingredient, described mineral alkali is sodium hydroxide or potassium hydroxide;
(5) preparation of auxiliary material: in another container, add 5～15 parts of remainder water and tougheners, stir, under 90 ℃ temperature condition, allow toughener fully dissolve, and add 1～5 part of cyclizing agent, reaction generates the six-ring complex compound, improve the water resistance of auxiliary material, add 1～3 part of sanitas then, 10～20 parts of siccative stir;
(6) major ingredient mixes with auxiliary material: auxiliary material is added in the major ingredient reactor, mix, and regulate PH7.5～7.8 with the aqueous citric acid solution of conditioning agent 5～20%, promptly obtain environmental-friendly amylopectin composite adhesive for paper products.
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| CN101191043B (en) * | 2006-11-20 | 2011-03-16 | 兰州大学 | Method for preparing urea-formaldehyde resin adhesive |
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2009
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