CN107981404A - A kind of coating fluid for improving papermaking-method reconstituted tobaccos combustibility and preparation method thereof - Google Patents

Abstract

The invention provides a coating solution for improving the combustion performance of reconstituted tobacco leaves by a papermaking method, a preparation method and application thereof. The coating solution is prepared from modified calcium carbonate, dispersing agent and tobacco extract, wherein the modified calcium carbonate is prepared by adding cellulose ether to 50% ethanol aqueous solution, and adding sodium hydroxide and cationic surface The active agent is stirred and heated to obtain a cationic cellulose ether solution; then calcium carbonate is added to the cationic cellulose ether solution and modified by adding a crosslinking agent. The coating solution of the present invention contains cationic cellulose ether modified calcium carbonate, which can be better combined with the fibers of the base sheet of reconstituted tobacco leaves, thereby improving the filling rate of fillers; helping the reconstituted tobacco leaves to fully burn and improving the combustion performance of reconstituted tobacco leaves , Reduce the amount of tar and carbon monoxide in reconstituted tobacco leaves.

Description

Coating solution for improving combustion performance of reconstituted tobacco leaves by papermaking method and preparation method thereof

technical field

The invention belongs to the field of reconstituted tobacco leaf processing, and in particular relates to a coating solution for improving the combustion performance of reconstituted tobacco leaves by a papermaking method and a preparation method thereof.

Background technique

The papermaking method of reconstituted tobacco leaves refers to the use of discarded tobacco stems, tobacco leaf fragments, tobacco powder and some low-grade tobacco leaves as raw materials, and first extracts them with solvents such as water, and the extracted solids are pulped and copied into sheets using papermaking equipment and principles. Base, the extract is concentrated and flavored to make a coating liquid, and then coated back on the base to form a tobacco sheet close to natural tobacco leaves, which can be directly used as a cigarette filler for cigarette production. A certain amount of fillers such as calcium carbonate and titanium dioxide are often added in the production of reconstituted tobacco leaves by papermaking, which can directly affect the bulk, strength, liquid absorption performance and appearance of reconstituted tobacco leaves, and can also indirectly affect the combustion of reconstituted tobacco leaves. rate, ash content, gray and the release of harmful substances in the smoke, etc.

Patent CN105231480A discloses an acid-resistant porous calcium carbonate as a flavoring carrier, which is applied to the coating solution of reconstituted tobacco leaves after absorbing flavors and fragrances, so as to avoid the hydrolysis of calcium carbonate in the acid coating solution and reduce the loss of flavors and fragrances. Modified porous calcium carbonate is used to absorb flavors and fragrances, and the bonding with fibers has not been improved; patent CN105852188A provides a coating composition for improving the bulkiness of tobacco sheets, including nano-calcium carbonate microcapsules, microcrystalline fibers In this invention, nano-calcium carbonate is used instead of precipitated calcium carbonate, which is better integrated into the paper surface, improves surface unevenness, maintains the strength of tobacco sheet, and improves the bulk of tobacco sheet , but due to intermolecular force, electrostatic effect, hydrogen bond, etc., the nano-calcium carbonate powder is easy to cause the agglomeration of calcium carbonate powder. When used, it needs to be wrapped into microcapsules and needs to be released by ultrasound when coating, which increases the cost of industrial production; patent CN103416839A discloses a method for improving the performance of reconstituted tobacco products by papermaking method. It adds diatomite to the coating solution to improve the performance of reconstituted tobacco products by papermaking method. The produced reconstituted tobacco leaves have higher tar and carbon monoxide emissions, which is not conducive to the harm reduction and tar reduction of cigarette products.

Domestic reconstituted tobacco leaves generally use calcium carbonate filling in pulp to improve the performance of reconstituted tobacco leaves. However, the particle size of calcium carbonate particles is small, and the loss in the paper base network is serious, which affects the actual filling rate of the substrate. Therefore, coating reconstituted tobacco leaves with the reconstituted tobacco leaf coating solution containing modified calcium carbonate to form reconstituted tobacco leaves coated with calcium carbonate on the surface can increase the filling rate of fillers and improve the performance of reconstituted tobacco leaves.

Contents of the invention

Aiming at the above-mentioned shortcomings of the prior art, the present invention proposes a coating solution for improving the combustion performance of reconstituted tobacco leaves by papermaking method and its preparation method. In the present invention, cellulose ether and cationic monomer undergo polymer side group reaction to generate cationic cellulose ether, Use this cationic cellulose ether to modify the surface of calcium carbonate, and disperse the modified calcium carbonate in the tobacco extract to obtain a coating solution. The coated reconstituted tobacco leaves have high filler filling rate, good porosity and good combustion performance. Strong, low release of tar and carbon monoxide.

The technical solution provided by the present invention: the coating liquid for improving the combustion performance of reconstituted tobacco leaves by papermaking method is composed of the following parts by weight: 15-25 parts of modified calcium carbonate, 0.25-1.2 parts of dispersant, tobacco 70-85 parts of extract;

Wherein the modified calcium carbonate is obtained by adding calcium carbonate to the cationic cellulose ether solution, adding a crosslinking agent and reacting at a temperature of 45-65° C. for 10-30 minutes, then filtering and collecting the product after drying, wherein the calcium carbonate, The mass ratio of the cationic cellulose ether solution to the crosslinking agent is 0.45-1.0:1:0.03-0.05; the cationic cellulose ether solution is completely dissolved in 50% of the cellulose ether according to the mass ratio of 1:8-11 In ethanol-water solution, add 5%-7% sodium hydroxide of cellulose ether mass, stir and react at normal temperature and pressure for 10-30min, then add cationic monomer with 27-40% cellulose ether mass, stir and heat to 45- Obtained by reacting at 65°C for 2.5-4 hours;

The dispersant is any one or more of 1% sodium hexametaphosphate aqueous solution, 1% sodium pyrophosphate aqueous solution, and 1% sodium tetrapolyphosphate aqueous solution;

The tobacco extract is obtained by adding 5-10 times of water to the tobacco waste by weight, extracting at 50-70°C for 2-5 hours, then collecting and extracting under reduced pressure and concentrating to a relative density of 1.21-1.28g/cm3.

The preferred technical scheme of the present invention: the cellulose ether is methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose, hydroxybutyl methyl cellulose, ethyl cellulose, hydroxyethyl cellulose One or more of cellulose and hydroxypropyl cellulose.

The preferred technical scheme of the present invention: the cationic surfactant is 3-chloro-2-hydroxypropyl-trimethylammonium chloride, 2,3-epoxypropyltrimethylammonium chloride, dimethyl One or more of diallyl ammonium chloride, polydimethyl diallyl ammonium chloride, diethyl diallyl ammonium chloride, methacryloxyethyl trimethyl ammonium chloride .

The preferred technical solution of the present invention: the crosslinking agent is any one of glyoxal and glutaraldehyde, or is mixed with glyoxal and glutaraldehyde in a mass ratio of 1:0.2-0.4.

The invention provides a method for preparing a coating solution for improving the combustion performance of reconstituted tobacco leaves by a papermaking method, which is characterized in that the specific steps are as follows:

(1) Take a certain amount of cellulose ether and add 50% ethanol aqueous solution according to the mass ratio of 1:8-11, stir it at normal temperature and pressure to completely dissolve it, then add 5%-7% of cellulose ether mass Sodium hydroxide continued to stir and react for 10-30min, then added a cationic surfactant with 27-40% cellulose ether mass to the reaction solution, stirred and heated to 45-65°C and continued to react for 2.5-4h to obtain a cationic cellulose ether solution; , the cellulose ether is methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose, hydroxybutyl methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose One or any several of them; the cationic surfactant is 3-chloro-2-hydroxypropyl-trimethylammonium chloride, 2,3-epoxypropyltrimethylammonium chloride, dimethyl Diallyl ammonium chloride, polydimethyl diallyl ammonium chloride, diethyl diallyl ammonium chloride, methacryloyloxyethyltrimethyl ammonium chloride Several;

(2) After the heating reaction in step (1) is completed, calcium carbonate is added in the cationic cellulose ether solution obtained by the reaction of step (1) under heat preservation conditions, and a crosslinking agent is added to continue the stirring reaction for 10-30min, and then Centrifuge, filter and collect the product and dry to obtain modified calcium carbonate; wherein the calcium carbonate, the cationic cellulose ether solution in step (1), and the mass ratio of the crosslinking agent are 0.45-1.0:1:0.03-0.05; wherein, The cross-linking agent is any one or both of glyoxal and glutaraldehyde;

(3) adding 5-10 times of water by weight to extract the tobacco waste for 2-5 hours at 50-70°C, and concentrating under reduced pressure to a concentrated solution with a relative density of 1.21-1.28g/cm3, namely the tobacco extract;

(4) Prepare raw materials according to the following parts by weight: 15-25 parts of modified calcium carbonate prepared in step (2), 0.25-1.2 parts of dispersant, 70-85 parts of tobacco extract prepared in step (3) ; Add all the modified calcium carbonate to all the tobacco extracts, add a dispersant and stir evenly to obtain the coating liquid.

The preferred technical solution of the present invention: the crosslinking agent in the step (2) is formed by mixing glyoxal and glutaraldehyde in a mass ratio of 1:0.2-0.4.

The preferred technical solution of the present invention: the heating reaction temperature in the step (1) is 60°C; the heat preservation reaction temperature in the step (2) is 55°C.

The coating solution of the present invention contains cationic cellulose ether modified calcium carbonate, which can be better combined with the fibers of the reconstituted tobacco leaf base sheet, and the filling rate of the filler is improved; the filling method of the coated reconstituted tobacco leaf calcium carbonate adopts surface coating , instead of filling in the slurry, the calcium carbonate particles are basically coated on the surface of the reconstituted tobacco leaves, the surface structure is loose and porous, and the air is more likely to enter the interior of the reconstituted tobacco leaves during combustion, which helps the reconstituted tobacco leaves to fully burn, and at the same time the main components of the reconstituted tobacco leaves It is flammable tobacco fiber without calcium carbonate which is non-combustible and heat-absorbing when added in pulp, which helps to improve the combustion performance of reconstituted tobacco leaves and reduce the amount of tar and carbon monoxide in reconstituted tobacco leaves.

Detailed ways

The present invention will be further described below in conjunction with embodiment.

Example 1, using tobacco stems, tobacco leaf fragments, tobacco dust and some low-grade tobacco leaves as raw materials, first extract them with solvents such as water, and use papermaking equipment and principles to beat the extracted solid phase, and add 20% calcium carbonate (relatively Slurry weight) is copied into a film base, and the extract is processed into a coating solution through concentration, flavoring, etc., and then coated back on the film base to form reconstituted tobacco leaf A.

Embodiment 2, a coating solution for improving the combustion performance of reconstituted tobacco leaves by the papermaking method, is characterized in that the specific preparation method is as follows:

(1) Dissolve 10 parts of hydroxyethyl cellulose completely in 100 parts of 50% ethanol-water solution under normal temperature and pressure and stirring conditions, add 0.6 parts of sodium hydroxide, stir for 15 minutes, then add 3.4 parts of methacryloyloxy Ethyltrimethylammonium chloride, stirring and heating to 60°C for 3 hours to obtain a cationic hydroxyethyl cellulose solution, adding calcium carbonate and a cross-linking agent to the solution at a temperature of 55°C, stirring for 20 minutes, and collecting the product by filtration and dry to obtain modified calcium carbonate, wherein the mass ratio of calcium carbonate, cationic cellulose ether solution, and cross-linking agent is 0.6:1:0.04, and the cross-linking agent is composed of glutaraldehyde and glyoxal according to the mass ratio Mixed in a ratio of 1:0.3;

(2) Tobacco stems, tobacco leaf fragments, tobacco powder and some low-grade tobacco leaves are used as raw materials and added with 8 times the amount of water, extracted at 60°C for 3 hours, and the extract is concentrated under reduced pressure to a relative density of 1.26g/ ^cm3 To concentrate tobacco, add 20 parts of modified calcium carbonate and 0.5 parts of sodium hexametaphosphate (1% aqueous solution) into 82 parts of tobacco extract concentrate, stir and mix evenly to obtain a coating liquid.

The solid phase extracted in the step (2) of Example 2 is beaten by papermaking equipment and principles to form a film base, and the coating solution prepared in Example 2 is backcoated on the film base to form reconstituted tobacco leaf B .

Embodiment 3, a coating solution for improving the combustion performance of reconstituted tobacco leaves by the papermaking method, is characterized in that the specific preparation method is as follows:

(1) Dissolve 3.7 parts of methylcellulose and 6.3 parts of hydroxypropyl methylcellulose in 90 parts of 50% ethanol-water solution completely under normal temperature and pressure and stirring conditions, add 0.54 parts of sodium hydroxide to alkalize the solution, and stir After reacting for 10 minutes, add 1.2 parts of 3-chloro-2-hydroxypropyl-trimethylammonium chloride, 2.4 parts of 2,3-epoxypropyltrimethylammonium chloride, stir and heat to 45°C for 3 hours to obtain cations Hydroxyethyl cellulose solution, add calcium carbonate and glutaraldehyde to this solution under the condition of heat preservation at 55°C, stir and react for 30 minutes, filter and collect the product and dry to obtain modified calcium carbonate; wherein the calcium carbonate, cationic hydroxyethyl The mass ratio of cellulose solution and glutaraldehyde is 0.5:1:0.03;

(2) Tobacco stems, tobacco leaf fragments, tobacco powder and some low-grade tobacco leaves are used as raw materials and added with 6 times the amount of water, extracted at a temperature of 50°C for 3 hours, and the extract is concentrated under reduced pressure to a relative density of 1.23g/cm ³ Tobacco concentration, 15 parts of modified calcium carbonate, 0.3 part of sodium hexametaphosphate (1% aqueous solution), 0.3 part of sodium pyrophosphate (1% aqueous solution) were added to 85 parts of tobacco extract concentrate, stirred and mixed evenly to obtain coating liquid.

The solid phase extracted in the step (2) of Example 3 is pulped by papermaking equipment and principles to form a film base, and the coating solution prepared in Example 3 is backcoated on the film base to form reconstituted tobacco leaves C .

Embodiment 4, a coating solution for improving the combustion performance of reconstituted tobacco leaves by the papermaking method, is characterized in that the specific preparation method is as follows:

(1) Dissolve 5.6 parts of hydroxyethyl methylcellulose and 4.4 parts of ethyl cellulose in 110 parts of 50% ethanol-water solution completely under normal temperature and pressure and stirring conditions, add 0.7 parts of sodium hydroxide to alkalize the solution, and stir After reacting for 10 minutes, add 3.8 parts of methacryloyloxyethyltrimethylammonium chloride, stir and heat to 65°C for 3.5 hours to obtain a cationic hydroxyethyl cellulose solution, and add calcium carbonate to the solution at 60°C and glyoxal, stirring and reacting for 24min, collecting the product by filtration and drying to obtain modified calcium carbonate; wherein the mass ratio of calcium carbonate, cationic cellulose ether solution, and glyoxal is 0.9:1:0.05;

(2) Tobacco stems, tobacco leaf fragments, tobacco powder and some low-grade tobacco leaves are used as raw materials, adding water 10 times its weight, extracting at a temperature of 70°C for 3 hours, and concentrating the extract under reduced pressure to a relative density of 1.28g/ ^cm3 For tobacco concentration, add 18 parts of modified calcium carbonate, 0.1 part of sodium hexametaphosphate (1% aqueous solution), and 0.1 part of sodium tetrapolyphosphate (1% aqueous solution) to 73 parts of tobacco extract concentrate, stir and mix evenly to obtain a coating liquid.

The solid phase extracted in the step (2) of Example 4 is beaten into a sheet base using papermaking equipment and principles, and the coating solution prepared in Example 42 is backcoated on the sheet base to form reconstituted tobacco leaf B .

Calculate the coating rate of the reconstituted tobacco leaves prepared in the above five implementations according to the following formula:

Spreading rate=(weight of reconstituted tobacco leaves-base weight of reconstituted tobacco leaves)/weight of reconstituted tobacco leaves×100%.

According to the requirements of YC/T16.3-2003, the quantitative and filling values of the reconstituted tobacco leaves prepared in the five examples were tested.

Then the reconstituted tobacco leaves prepared in the above five examples were respectively cut into shredded tobacco with a width of 1.0mm, and the cigarette material of the same specification was rolled on the same machine to make cigarettes, and the specification was 84(34+54)mm×24.2mm . Sorting the samples by weight, the weight range of a single piece is 850±20mg, after the samples are balanced for 48 hours at a relative humidity of (60±5)% and a temperature of (22±2)°C, according to GB/T19609-2004 and GB/T23356 —The requirements of 2009 to test the tar and carbon monoxide emissions of reconstituted tobacco leaves separately.

The various test results of the reconstituted tobacco leaves prepared in the five embodiments are as follows:

It can be seen from the test results that when the quantity of reconstituted tobacco leaves is constant, the coating rate of reconstituted tobacco leaves coated with the coating solution of the present invention increases, the filling value increases, the release of tar and CO is significantly reduced, and the combustion performance of reconstituted tobacco leaves is improved. .

Claims (7)

1. A coating solution for improving the combustion performance of reconstituted tobacco leaves by the papermaking method, which is composed of the following parts by weight: 15-25 parts of modified calcium carbonate, 0.25-1.2 parts of dispersant, and 70-85 parts of tobacco extract; Wherein the modified calcium carbonate is obtained by adding calcium carbonate to the cationic cellulose ether solution, adding a crosslinking agent and reacting at a temperature of 45-65° C. for 10-30 minutes, then filtering and collecting the product after drying, wherein the calcium carbonate, The mass ratio of the cationic cellulose ether solution to the crosslinking agent is 0.45-1.0:1:0.03-0.05; the cationic cellulose ether solution is completely dissolved in 50% of the cellulose ether according to the mass ratio of 1:8-11 In ethanol-water solution, add 5%-7% sodium hydroxide of cellulose ether mass, stir and react at normal temperature and pressure for 10-30min, then add cationic monomer with 27-40% cellulose ether mass, stir and heat to 45- Obtained by reacting at 65°C for 2.5-4 hours; The dispersant is any one or more of 1% sodium hexametaphosphate aqueous solution, 1% sodium pyrophosphate aqueous solution, and 1% sodium tetrapolyphosphate aqueous solution; The tobacco extract is obtained by adding 5-10 times of water to the tobacco waste by weight, extracting at 50-70°C for 2-5 hours, then collecting and extracting under reduced pressure and concentrating to a relative density of 1.21-1.28g/cm3. 2. A coating liquid for improving the combustion performance of reconstituted tobacco leaves by papermaking method according to claim 1, characterized in that: said cellulose ether is methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose One or more of methyl cellulose, hydroxybutyl methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose. 3. A coating solution for improving the combustion performance of reconstituted tobacco leaves according to claim 1, wherein the cationic surfactant is 3-chloro-2-hydroxypropyl-trimethylammonium chloride , 2,3-epoxypropyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride, polydimethyl diallyl ammonium chloride, diethyl diallyl ammonium chloride, One or more of methacryloyloxyethyltrimethylammonium chloride. 4. A method for preparing a modified filler for improving the physical properties of reconstituted tobacco leaves according to claim, characterized in that: the cross-linking agent is any one of glyoxal, glutaraldehyde or formed from glyoxal Dialdehyde and glutaraldehyde are mixed according to the mass ratio of 1:0.2-0.4. 5. A method for preparing a coating solution for improving the combustion performance of reconstituted tobacco leaves by papermaking, characterized in that the specific steps are as follows: (1) Take a certain amount of cellulose ether and add 50% ethanol aqueous solution according to the mass ratio of 1:8-11, stir it at normal temperature and pressure to completely dissolve it, then add 5%-7% of cellulose ether mass Sodium hydroxide continued to stir and react for 10-30min, then added a cationic surfactant with 27-40% cellulose ether mass to the reaction solution, stirred and heated to 45-65°C and continued to react for 2.5-4h to obtain a cationic cellulose ether solution; , the cellulose ether is methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose, hydroxybutyl methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose One or any several of them; the cationic surfactant is 3-chloro-2-hydroxypropyl-trimethylammonium chloride, 2,3-epoxypropyltrimethylammonium chloride, dimethyl Diallyl ammonium chloride, polydimethyl diallyl ammonium chloride, diethyl diallyl ammonium chloride, methacryloyloxyethyltrimethyl ammonium chloride Several; (2) After the heating reaction in step (1) is completed, calcium carbonate is added in the cationic cellulose ether solution obtained by the reaction of step (1) under heat preservation conditions, and a crosslinking agent is added to continue the stirring reaction for 10-30min, and then Centrifuge, filter and collect the product and dry to obtain modified calcium carbonate; wherein the calcium carbonate, the cationic cellulose ether solution in step (1), and the mass ratio of the crosslinking agent are 0.45-1.0:1:0.03-0.05; wherein, The cross-linking agent is any one or both of glyoxal and glutaraldehyde; (3) adding 5-10 times of water by weight to extract the tobacco waste for 2-5 hours at 50-70°C, and concentrating under reduced pressure to a concentrated solution with a relative density of 1.21-1.28g/cm3, namely the tobacco extract; (4) Prepare raw materials according to the following parts by weight: 15-25 parts of modified calcium carbonate prepared in step (2), 0.25-1.2 parts of dispersant, 70-85 parts of tobacco extract prepared in step (3) ; Add all the modified calcium carbonate to all the tobacco extracts, add a dispersant and stir evenly to obtain the coating liquid. 6. a kind of preparation method of the coating liquid that improves the combustion performance of reconstituted tobacco leaf according to claim 5, it is characterized in that: the cross-linking agent in the described step (2) is made of glyoxal and glutaraldehyde according to The mass ratio is 1:0.2-0.4 by mixing. 7. A method for preparing a coating solution for improving the combustion performance of reconstituted tobacco leaves according to claim 5, characterized in that: the heating reaction temperature in the step (1) is 60° C.; The heat preservation temperature is 55 ℃.