CN114958203B

CN114958203B - Small dryer stripper applied to eTAD toilet paper machine and preparation method thereof

Info

Publication number: CN114958203B
Application number: CN202210604940.6A
Authority: CN
Inventors: 杨致富; 黄军; 马晓飞; 刘亮华; 马朴; 郭丽芳; 赵志松; 李陶伟
Original assignee: Jining Nantiannongke Chemical Co ltd; Vinda Paper Zhejiang Co Ltd
Current assignee: Jining Nantiannongke Chemical Co ltd; Vinda Paper Zhejiang Co Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2023-07-07
Anticipated expiration: 2042-05-31
Also published as: CN114958203A

Abstract

The invention discloses a small drying cylinder stripping agent applied to an eTAD toilet paper machine and a preparation method thereof, wherein the stripping agent comprises the following components in percentage by mass: 13-31% of polyol ester, 13-31% of vaseline, 1-3% of nonionic surfactant, 2-5% of anionic surfactant and the balance of deionized water, wherein the sum of the mass percentages of the components is 100%. The invention takes the polyol ester and the vaseline as core components according to a specific proportion, prepares emulsion particles with the particle size of 0.15-0.30 microns through a special emulsifying system and an emulsifying process, and can meet the stripping and lubrication requirements of the stripping agent of the small drying cylinder of the eTAD paper machine, thereby ensuring that paper web can be smoothly transferred from the small drying cylinder to various structural nets, and ensuring that the abrasion degree of a scraper of the small drying cylinder meets the requirements.

Description

Small dryer stripper applied to eTAD toilet paper machine and preparation method thereof

Technical Field

The invention belongs to the technical field of papermaking chemicals, and particularly relates to a small drying cylinder stripper of an eTAD toilet paper machine, which can be directly diluted on line and then sprayed on the surface of a small drying cylinder.

Background

Along with the improvement of living standard, the quality requirements of people on the daily paper are also increasingly improved. The quality of the paper for daily use such as water absorption, bulkiness, softness and hand feeling is determined by wrinkling. The completion of creping is dependent primarily on the design of the machine and the creping aids (cylinder sticking agents, release agents and improvers). The manufacturers of paper making machines for daily use find a compromise technology which combines paper quality and energy consumption between the traditional Dry Creping Technology (DCT) and the hot air penetrating Technology (TAD), and the eTAD paper making machine technology is one of the compromise technologies, and the eTAD paper making machine technology can produce the daily use paper with the quality close to the TAD, but the production cost is far lower than that of the TAD.

Principle of operation of the eTAD toilet paper machine (as shown in fig. 1):

the web is dewatered by a shoe press and transferred from the felt to a small drying cylinder;

the transfer of the web from the small cylinders to the structured wire, the small cylinder surfaces having to be sprayed with a release agent, reducing or avoiding the adhesion of the web to the small cylinder surfaces, ensuring a smooth transfer;

-the web is extruded at the creping roll position of the structuring wire by means of the speed difference between the small drying cylinder and the structuring wire, and is shaped by means of a shaping vacuum box;

the transfer of the web from the wire to the large drying cylinder, the wire also requires the spraying of a release agent in order to avoid that the wire will adhere to the fibres. The structural net is divided into a fine net, a middle net and a coarse net.

The stripping agents for small drying cylinders, such as mineral oil stripping agents, imidazoline stripping agents, wax stripping agents, organosilicon stripping agents, polyether stripping agents, vegetable oil stripping agents and synthetic oil stripping agents, have unsatisfactory effects, are not completely or even completely transferable when the paper web is transferred from the small drying cylinder to the structural net, are scrapers which can be transferred but severely abrade the small drying cylinder, or can be smoothly transferred when the fine net is used for production but can not be smoothly transferred when the fine net is changed into the middle net or the coarse net.

In this case, there is an urgent need for a small drying cylinder stripper having better performance to solve the problems that the conventional stripper cannot solve.

Disclosure of Invention

Aiming at the problems existing in the prior art, the invention aims to provide a small drying cylinder stripping agent applied to an eTAD toilet paper machine and a preparation method thereof.

In order to solve the technical problems, the invention adopts the following technical scheme: the small dryer stripper applied to the eTAD toilet paper machine comprises the following components in percentage by mass: 13-31% of polyol ester, 13-31% of vaseline, 1-3% of nonionic surfactant, 2-5% of anionic surfactant and the balance of deionized water, wherein the sum of the mass percentages of the components is 100%.

Preferably, the particle diameter of the stripping agent is in the range of 0.15-0.30 μm.

Preferably, the polyol ester is any one or more of glycerol tristearate, glycerol trioleate, pentaerythritol tetraoleate and trimethylolpropane trioleate.

Preferably, the nonionic surfactant is isomeric tridecanol polyoxyethylene ether (EO number 12).

Preferably, the anionic surfactant is sodium dodecyl diphenyl ether disulfonate.

The invention also provides a preparation method of the small drying cylinder stripping agent applied to the eTAD toilet paper machine, which comprises the following steps:

firstly, adding polyol ester, vaseline, a nonionic surfactant and an anionic surfactant in a reaction kettle in proportion, heating to 70-90 ℃, and stirring to form a uniform solution;

then, the stirring speed is increased to above 600rpm, deionized water preheated to 70-90 ℃ is added, and uniform white emulsion is formed through stirring;

and then, carrying out ultrasonic emulsification on the uniform white emulsion for more than 0.5h, continuing to carry out high-pressure homogenization treatment under 50-70 MPa for at least 1h, and rapidly cooling to 25-30 ℃ to form the white emulsion with the particle size of 0.15-0.30 mu m.

The emulsification process comprises the following steps: ultrasonic emulsification is carried out for 1h at 70-80 ℃, high-pressure homogenization is carried out for 2h under 60MPa, and then rapid cooling is carried out to 25-30 ℃. The emulsion obtained by the process can be stabilized, the stability coefficient TSI of the turbo can be ensured to be less than 1.5, the index is met, and the emulsion is stable.

The beneficial effects are that: compared with the prior art, the invention is different from the prior art, mainly uses the multi-element (more than or equal to 3-element) alcohol ester and vaseline as core components according to a specific proportion, prepares emulsion particles with the particle size of 0.15-0.30 microns through a special emulsifying system and an emulsifying process, and can meet the stripping and lubricating requirements of the stripping agent of the small drying cylinder of the eTAD paper machine, thereby ensuring that a paper web can be smoothly transferred from the small drying cylinder to various structural nets (fine net, medium net and coarse net) and ensuring that the abrasion degree of a small drying cylinder scraper meets the requirements.

Drawings

FIG. 1 is a schematic diagram of the operation of an eTAD toilet paper machine;

FIG. 2 is a comparison of transfer of a web from a small cylinder to a structural wire (middle wire) after application of example 1 of the present invention and a conventional stripper.

Detailed Description

The invention will be further elucidated with reference to specific examples. It is to be understood that these examples are for illustrative purposes only and not for limiting the scope of the invention, and that various equivalent modifications to the invention will fall within the scope of the claims appended hereto, as viewed by a person skilled in the art.

[ example 1 ]

21.74g of glycerol tristearate, 21.74g of vaseline, 2.72g of isomeric tridecanol polyoxyethylene ether (TO-12) and 3.8g of sodium dodecyl diphenyl ether disulfonate are sequentially added into a reaction kettle, the temperature is raised TO 80 ℃, stirring is started, and the stirring speed is 100rpm, so that a uniform solution is formed. The stirring speed was increased to 700rpm, 50g of deionized water preheated to 80℃was slowly added and stirred until a uniform white emulsion formed. Then the white emulsion is firstly subjected to ultrasonic emulsification for 1h at 80 ℃, then is continuously homogenized for 2h under 60MPa under high pressure, and is rapidly cooled to 25-30 ℃ to form emulsion with particle size of 0.15-0.30 microns, and the appearance is white liquid. The particle size (D50) was 0.217. Mu.m, as measured by the solid content of 49.7%, pH7.9, apparent viscosity of 59 mPa. Mu.s and horiba LA-960.

[ example 2 ]

21.74g of trimethylolpropane trioleate, 21.74g of vaseline, 2.72g of isomeric tridecanol polyoxyethylene ether (TO-12) and 3.8g of sodium dodecyl diphenyl ether disulfonate are sequentially added into a reaction kettle, the temperature is raised TO 70 ℃, and stirring is started, and the stirring speed is 100rpm until a uniform solution is formed. The stirring speed was increased to 700rpm, 50g of deionized water preheated to 70℃was slowly added and stirred until a uniform white emulsion formed. Then the white emulsion is firstly subjected to ultrasonic emulsification for 1h at 70 ℃, then is continuously homogenized for 2h under 60MPa under high pressure, and is rapidly cooled to 25-30 ℃ to form emulsion with particle size of 0.15-0.30 microns, and the appearance is white liquid. The particle size (D50) was 0.223. Mu.m, as measured by the measurement of the solids content of 49.9%, pH8.1, apparent viscosity of 64 mPa. Mu.s and horiba LA-960.

[ example 3 ]

21.74g of triolein, 21.74g of vaseline, 2.72g of isomeric tridecanol polyoxyethylene ether (TO-12) and 3.8g of sodium dodecyl diphenyl ether disulfonate are sequentially added into a reaction kettle, the temperature is raised TO 70 ℃, stirring is started, and the stirring speed is 100rpm, so that a uniform solution is formed. The stirring speed was increased to 700rpm, 50g of deionized water preheated to 70℃was slowly added and stirred until a uniform white emulsion formed. Then the white emulsion is firstly subjected to ultrasonic emulsification for 1h at 70 ℃, then is continuously homogenized for 2h under 60MPa under high pressure, and is rapidly cooled to 25-30 ℃ to form emulsion with particle size of 0.15-0.30 microns, and the appearance is white liquid. The particle size (D50) was 0.201. Mu.m, as measured by the method of measuring 49.8% solids, pH8.2, apparent viscosity 50 mPas and horiba LA-960.

[ example 4 ]

21.74g of pentaerythritol tetraoleate, 21.74g of Vaseline, 2.72g of isomeric tridecanol polyoxyethylene ether (TO-12) and 3.8g of sodium dodecyl diphenyl ether disulfonate are sequentially added into a reaction kettle, the temperature is raised TO 70 ℃, stirring is started, and the stirring speed is 100rpm, so that a uniform solution is formed. The stirring speed was increased to 700rpm, 50g of deionized water preheated to 70℃was slowly added and stirred until a uniform white emulsion formed. Then the white emulsion is firstly subjected to ultrasonic emulsification for 1h at 70 ℃, then is continuously homogenized for 2h under 60MPa under high pressure, and is rapidly cooled to 25-30 ℃ to form emulsion with particle size of 0.15-0.30 microns, and the appearance is white liquid. The particle size (D50) was 0.241. Mu.m, as measured by the solid content of 49.9%, pH7.7, apparent viscosity of 75 mPa. Mu.s and horiba LA-960.

[ example 5 ]

30.436g of glycerol tristearate, 13.044g of vaseline, 2.72g of isomeric tridecanol polyoxyethylene ether (TO-12) and 3.8g of sodium dodecyl diphenyl ether disulfonate are sequentially added into a reaction kettle, the temperature is raised TO 80 ℃, stirring is started, and the stirring speed is 100rpm, so that a uniform solution is formed. The stirring speed was increased to 700rpm, 50g of deionized water preheated to 80℃was slowly added and stirred until a uniform white emulsion formed. Then the white emulsion is firstly subjected to ultrasonic emulsification for 1h at 80 ℃, then is continuously homogenized for 2h under 60MPa under high pressure, and is rapidly cooled to 25-30 ℃ to form emulsion with particle size of 0.15-0.30 microns, and the appearance is white liquid. The particle size (D50) was 0.293. Mu.m, as measured by the solid content of 49.8%, pH7.8 and apparent viscosity of 79 mPa. Mu.s and horiba LA-960.

[ example 6 ]

13.044g of glycerol tristearate, 30.436g of vaseline, 2.72g of isomeric tridecanol polyoxyethylene ether (TO-12) and 3.8g of sodium dodecyl diphenyl ether disulfonate are sequentially added into a reaction kettle, the temperature is raised TO 80 ℃, stirring is started, and the stirring speed is 100rpm, so that a uniform solution is formed. The stirring speed was increased to 700rpm, 50g of deionized water preheated to 80℃was slowly added and stirred until a uniform white emulsion formed. Then the white emulsion is firstly subjected to ultrasonic emulsification for 1h at 80 ℃, then is continuously homogenized for 2h under 60MPa under high pressure, and is rapidly cooled to 25-30 ℃ to form emulsion with particle size of 0.15-0.30 microns, and the appearance is white liquid. The particle size (D50) was 0.281. Mu.m, as measured by the method of measuring 49.7% solids, pH7.9 and apparent viscosity 80 mPa. Mu.s and horiba LA-960.

[ comparative example 1 ]

43.48g of glycerol tristearate, 2.72g of isomeric tridecanol polyoxyethylene ether (TO-12) and 3.8g of sodium dodecyl diphenyl ether disulfonate are sequentially added into a reaction kettle, the temperature is raised TO 80 ℃, stirring is started, and the stirring speed is 100rpm, so that a uniform solution is formed. The stirring speed was increased to 700rpm, 50g of deionized water preheated to 80℃was slowly added and stirred until a uniform white emulsion formed. Then the white emulsion is firstly subjected to ultrasonic emulsification for 1h at 80 ℃, then is continuously homogenized for 2h under 60MPa under high pressure, and is rapidly cooled to 25-30 ℃ to form emulsion with particle size of 0.15-0.30 microns, and the appearance is white liquid. The particle size (D50) was 0.226. Mu.m, as measured by the method of measuring 49.8% solids, pH7.9 and apparent viscosity 68 mPas, horiba LA-960.

[ comparative example 2 ]

43.48g of trimethylolpropane trioleate, 2.72g of isomeric tridecanol polyoxyethylene ether (TO-12) and 3.8g of sodium dodecyl diphenyl ether disulfonate are sequentially added into a reaction kettle, the temperature is raised TO 70 ℃, and stirring is started, wherein the stirring speed is 100rpm, so that a uniform solution is formed. The stirring speed was increased to 700rpm, 50g of deionized water preheated to 70℃was slowly added and stirred until a uniform white emulsion formed. Then the white emulsion is firstly subjected to ultrasonic emulsification for 1h at 70 ℃, then is continuously homogenized for 2h under 60MPa under high pressure, and is rapidly cooled to 25-30 ℃ to form emulsion with particle size of 0.15-0.30 microns, and the appearance is white liquid. The particle size (D50) was 0.231. Mu.m, as measured by the measurement of the solid content of 49.9%, pH7.9 and apparent viscosity of 63 mPa. Mu.s and horiba LA-960.

[ comparative example 3 ]

43.48g of Vaseline, 2.72g of isomeric tridecanol polyoxyethylene ether (TO-12) and 3.8g of sodium dodecyl diphenyl ether disulfonate are sequentially added into a reaction kettle, the temperature is raised TO 70 ℃, stirring is started, and the stirring speed is 100rpm until a uniform solution is formed. The stirring speed was increased to 700rpm, 50g of deionized water preheated to 70℃was slowly added and stirred until a uniform white emulsion formed. Then the white emulsion is firstly subjected to ultrasonic emulsification for 1h at 70 ℃, then is continuously homogenized for 2h under 60MPa under high pressure, and is rapidly cooled to 25-30 ℃ to form emulsion with particle size of 0.15-0.30 microns, and the appearance is white liquid. The particle size (D50) was 0.301. Mu.m, as measured by the method of measuring 49.9% solids, pH7.9 and apparent viscosity of 99 mPa. Mu.s and horiba LA-960.

[ physical and chemical Property test ]:

examples and comparative examples obtained stripping agents, which were tested for particle size (horiba la-960) and emulsion stability index (TURBISCAN stability Analyzer from formula Co., france) respectively, and the emulsion itself stability was evaluated respectively. Emulsion with particle size (D50) of 0.15-0.30 microns and a Turkiscan stability coefficient TSI of less than 1.5 is considered as a stability compounding requirement through emulsion particle size detection, the emulsion is considered as stable during storage, otherwise, the emulsion is unstable and layering problem occurs.

The various types of stripping agents in the embodiment, the comparative example and the market are respectively applied to an eTAD toilet paper machine, each sample is sprayed on the surface of a small drying cylinder after being diluted on line, and the effect evaluation of each sample is carried out according to whether the paper web can be transferred to various structural nets from the small drying cylinder or not and the abrasion condition of a small drying cylinder scraper (when the structural nets are used uniformly, the abrasion condition of the scraper is evaluated), wherein the commercial oil mineral oil stripping agent is Nalco 64575C in Nalco family, the commercial wax stripping agent is Basif Poligen WE 6, the commercial organic silicon stripping agent is Jining Nannong family NT RE 886A, the commercial imidazoline stripping agent is Jining Nannong family NT RE 8806, the commercial polyether stripping agent is sand rope SLANIK 1010 and the commercial vegetable oil stripping agent is NCR BIUBE 801. The test and evaluation results are shown in table 1 below:

from the test data, it can be seen that: examples 1-4 result in small cylinder stripper application sprayed onto small cylinder surface, the web being transferred smoothly onto various gauge wire, the wear on the doctor blade being 1-2mm after 156h-182h work; with too low or too high an amount of petrolatum, the transfer of the web to the medium and coarse wire is not ideal enough, and at this time the blade wear of 24 hours reaches 7-8mm. When no petrolatum or polyol ester was added, the paper web could not even be transferred smoothly from the coarse wire in comparative examples 1 to 3, and the abrasion of the doctor blade for 24 hours reached 3 to 6mm. On the other hand, the commercial stripping agent is sprayed on the surface of a small drying cylinder, so that the paper web can not be transferred or can only be transferred during fine-mesh production, but the abrasion to a scraper is also large.

As shown in fig. 2, the transfer of the web from the small cylinder to the structural wire (middle wire) is compared after the application of the release agent of example 1 of the present invention and the conventional release agent. Table 2 shows the on-press test of small dryer doctor blade wear tracking for example 1 stripper of the present invention and conventional stripper (imidazolines, jining Nannon farm NT RE 8806).

Table 2 comparison of the inventive example 1 stripper and conventional stripper on-machine test of small dryer doctor blade wear

From the results of Table 2 and FIG. 2, it can be seen that the web of the example of the present invention was transferred smoothly and the abrasion to the doctor blade was significantly reduced, thereby ensuring a long-term stable operation of the toilet paper machine.

In summary, compared with the prior art, the invention has the following advantages:

the stripping agent used in the papermaking field is conventionally a mineral oil stripping agent, an imidazoline stripping agent, a wax stripping agent, an organosilicon stripping agent, a polyether stripping agent, a vegetable oil stripping agent and a synthetic oil stripping agent, and has an unsatisfactory effect when being applied to an eTAD toilet paper machine as a small drying cylinder stripping agent, or the paper web is not completely or even not transferred when being transferred from a small drying cylinder to a structural net, or a scraper which can be transferred but severely abrades the small drying cylinder, or the paper web can be smoothly transferred but not transferred when being transferred into a middle net or a coarse net when being produced by using a fine net. According to the invention, polyol (more than or equal to 3-element) ester and vaseline with excellent lubricity are prepared into emulsion with the particle size of 0.15-0.30 microns according to a specific proportion by a specific emulsifying system and an emulsifying process, and the stripping and lubricating requirements of a small drying cylinder stripper of an eTAD toilet paper machine can be met, so that the paper web can be ensured to be smoothly transferred to various structural nets (fine nets, middle nets and coarse nets) from the small drying cylinder.

Vaseline with molecular weight far greater than that of liquid mineral oil is introduced, and vaseline and polyol (more than or equal to 3 yuan) ester are successfully prepared into emulsion with stable particle size according to a specific proportion and a specific emulsifying system and emulsifying technology, so that excellent lubricating performance is given to the product, the abrasion of a small dryer scraper is ensured to be reduced to the minimum, and the service life of the small dryer scraper is greatly prolonged. Under the same conditions, the service life of the small dryer doctor blade is prolonged by 600 percent.

Claims

1. The small dryer stripper applied to the eTAD toilet paper machine is characterized by comprising the following components in percentage by mass: 13-31% of polyol ester, 13-31% of vaseline, 1-3% of nonionic surfactant, 2-5% of anionic surfactant and the balance of deionized water, wherein the sum of the mass percentages of the components is 100%; the grain diameter of the stripping agent ranges from 0.15 to 0.30 mu m;

the polyol ester is any one or a mixture of a plurality of glycerol tristearate, glycerol trioleate, pentaerythritol tetraoleate and trimethylolpropane trioleate.

2. A small cylinder stripper for use in an eTAD toilet paper machine as claimed in claim 1, wherein: the nonionic surfactant adopts isomeric tridecanol polyoxyethylene ether, and the EO number is 12.

3. A small cylinder stripper for use in an eTAD toilet paper machine as claimed in claim 1, wherein: the anionic surfactant adopts sodium dodecyl diphenyl ether disulfonate.

4. A method of preparing the small cylinder stripper of any one of claims 1-3 for use in an eTAD toilet tissue machine, comprising the steps of:

firstly, adding polyol ester, vaseline, nonionic surfactant and anionic surfactant in proportion into a reaction kettle, heating to 70-90 ℃, and stirring to form a uniform solution;

then, the stirring speed is increased to above 600rpm, deionized water preheated to 70-90 ℃ is added, and uniform white emulsion is formed by stirring;

then, after the uniform white emulsion is subjected to ultrasonic emulsification for more than 0.5h, the uniform white emulsion is continuously subjected to high-pressure homogenization treatment under 50-70 MPa for at least 1h, and the temperature is rapidly reduced to 25-30 ℃ to form the white emulsion with the particle size of 0.15-0.30 mu m.