CN112391837B

CN112391837B - Konjak mask base cloth preparation method and konjak mask

Info

Publication number: CN112391837B
Application number: CN202011370779.8A
Authority: CN
Inventors: 吴平; 张力; 李磊; 苟春鹏; 余春磊
Original assignee: Hubei Yizhi Konjac Biotechnology Corp
Current assignee: Hubei Yizhi Konjac Biotechnology Corp
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2022-11-15
Anticipated expiration: 2040-11-30
Also published as: CN112391837A

Abstract

The invention provides a preparation method of a konjak mask base cloth, which comprises the steps of S1, preparing a spinning solution; s2, preparing an alkaline gel solution, an acidic washing solution and a neutral washing solution; s3, spinning the spinning stock solution by a spinning machine, and then pouring the spinning stock solution into an alkaline gel solution to obtain nascent fibers; s4, introducing the nascent fiber into an acidic water washing solution after primary drafting, and then performing secondary drafting, a neutral water washing solution and an alkaline water washing solution, drying and winding to obtain glucomannan fiber; s5, taking a proper amount of distilled water, weighing edible gum, purified konjac powder, propylene glycol, glycerol, a gel additive and glucomannan fiber, stirring, injecting into a mold, and then cooking to obtain a preliminarily formed mask base cloth; and S6, cleaning, sterilizing and cutting the preliminarily formed mask base cloth to obtain the finished product of the konjak mask base cloth. The mask base cloth prepared by the invention improves the water retention property, the water retention property and the tensile strength of the mask.

Description

Konjak mask base cloth preparation method and konjak mask

Technical Field

The invention relates to the technical field of mask production, in particular to a konjak mask base cloth preparation method and a konjak mask.

Background

The existing cloth-attached facial mask is mainly prepared by coating a layer of gel preparation on non-woven fabrics or directly soaking the non-woven fabrics with the facial mask solution, and is also prepared into a cloth-attached facial mask by using silk, cotton, biological fibers and other materials. The patch type facial mask prepared based on the materials mainly has the defects of poor affinity with skin, low percutaneous absorption rate of nutrient components, no stretchability, easiness in breakage, insufficient softness, low degradation efficiency and the like.

Patent document 201910565664.5 discloses a method for manufacturing a mask base fabric: adding edible gum into water, stirring to dissolve completely, adding natural active substance and konjac glucomannan under stirring, and stirring to obtain viscous liquid; injecting the viscous feed liquid into a mould of the mask base cloth, and carrying out heat preservation crosslinking in a damp-heat steam bath environment to obtain a formed mask base cloth; and cleaning the mask base cloth, dehydrating, and performing irradiation sterilization treatment to obtain the konjak mask base cloth.

The konjak mask base cloth in the technology is used as an essence carrier, the water absorption and water holding capacity of the konjak mask base cloth is mainly determined by the gel characteristics of colloids in the base cloth, and when the environmental temperature, the pH value and the like are changed, the performance of the mask is greatly changed.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a preparation method of a konjak mask base cloth, which solves the problems of poor water retention, poor water retention and weak tensile strength of the konjak mask base cloth in the prior art.

According to the embodiment of the invention, the preparation method of the konjak mask base cloth comprises the following steps:

s1, preparing a spinning stock solution, adding a proper amount of purified konjac flour and PVA into distilled water, mechanically stirring and dissolving, and then defoaming to obtain the spinning stock solution;

s2, weighing distilled water with the same mass as the spinning solution, weighing a proper amount of alkaline powder, dissolving the alkaline powder into the distilled water, then dissolving genipin into the solution to obtain an alkaline gel solution, weighing distilled water with the same mass as the spinning solution, weighing a proper amount of edible acid, and dissolving the edible acid into the distilled water to obtain an acidic washing solution; weighing distilled water with the same mass as the spinning solution as a neutral washing solution;

s3, spinning the spinning solution prepared in the step S1 through a spinning machine, and then pouring the spinning solution into the alkaline gel solution prepared in the step S2 to obtain nascent fibers;

s4, introducing the nascent fiber obtained in the step S3 into the acidic water washing solution prepared in the step S2 after primary drafting, and then performing secondary drafting, neutral water washing solution and alkaline water washing solution, drying and winding to obtain glucomannan fiber;

s5, taking a proper amount of distilled water, weighing edible gum, purified konjac powder, propylene glycol, glycerol, a gel additive and glucomannan fiber obtained in the step S4, adding the materials into the distilled water, mechanically stirring and dissolving to obtain viscous material liquid, injecting the viscous material liquid into a die of the mask base cloth, and steaming and boiling in a damp and hot steam bath environment to obtain preliminarily-formed mask base cloth;

and S6, cleaning, sterilizing and cutting the preliminarily formed mask base cloth prepared in the S5 to obtain the finished product of the konjak mask base cloth.

In the step S1, the mass of the purified konjac powder and the mass of PVA are respectively 3% -4% and 1% -2% of the mass of distilled water, the molecular weight of the purified konjac powder is 12000-15000, the molecular weight of PVA is 80000-100000, the time of mechanical stirring and dissolving is 1h, and the defoaming method is vacuumizing and defoaming for 1-2 h.

In step S2, when preparing the alkaline gel solution, the alkaline powder may be calcium hydroxide, sodium hydroxide or potassium hydroxide powder, preferably calcium hydroxide powder, and the pH value is 12-13, the alkaline powder may be calcium hydroxide, sodium hydroxide or potassium hydroxide powder, and the genipin may be 1% of the total mass of the solution, and when preparing the acidic water-washing solution, the edible acid may be 0.1-0.2% of the mass of the distilled water, wherein the edible acid may be citric acid, acetic acid or malic acid, preferably citric acid.

In the step S3, the gelling temperature is 90-95 ℃, and the solidification time is 5-10 min.

In the step S3, the diameter of the spinneret orifice of the spinning machine is 0.05-0.08 mm.

In step S4, the drafting multiple of the first drafting is 2-4 times, the temperature of the acid washing solution is 25-60 ℃, the solidification time is 5-10 min, the drafting multiple of the second drafting of the nascent fiber is 1.1-1.5 times, the washing time of the neutral washing solution of the nascent fiber is 3-5 min, the drying temperature of the nascent fiber is 60-90 ℃, and the drying time is 2-3 min.

In the step S5, the mass of the edible gum is 4-5% of the mass of the distilled water, the mass of the purified konjac glucomannan powder is 2-3% of the mass of the distilled water, the mass of the propylene glycol and the glycerol are 8-9% of the mass of the distilled water, the mass of the glucomannan fiber obtained in the step S4 is 10-15% of the mass of the distilled water, the mass of the gel auxiliary agent is 0.5-10% of the mass of the distilled water, the mechanical stirring and dissolving time is 1h, and the cooking time under the damp-heat steam bath environment is 1-2 h.

In addition, the invention also provides a mask, which comprises the konjak mask base cloth prepared by the konjak mask base cloth preparation method and essence.

The essence is prepared by heating 80-85% of water, 3-5% of collagen and 6-10% of glycerol to be completely dissolved, uniformly stirring, cooling to 45-50 ℃, adding 1.5-2% of nano-silver solution, 0.1-1% of konjak ceramide, 0.3-1% of oat kernel extract, 0-1% of dendrobium nobile extract, 0-1% of aloe barbadensis leaf extract, 0-1% of sophora flavescens root extract, 0-1% of lycium barbarum fruit extract and 0-1% of echinacea purpurea extract, uniformly stirring, and adjusting the pH to 5.5-6.5 by using citric acid.

Compared with the prior art, the invention has the following beneficial effects: the invention adopts PVA and glucomannan to be blended and modified, and genipin is taken as a cross-linking agent to prepare the glucomannan fiber under the alkaline condition. Because the glucomannan has higher water absorption performance, the glucomannan fiber prepared by the spinning technology has higher specific surface area, and the water retention property of the hollow structure after the mask base cloth is prepared are further improved. After PVA blending improvement is adopted, the tensile strength of the mask base cloth can reach more than 350 MPa. After the primary fiber is stretched, the fiber structure becomes more perfect, the breaking strength is obviously improved, but along with the increase of the stretching ratio, the fiber structure is damaged and gradually reduced, so that the proper stretching ratio plays an important role in improving the mechanical property of the primary fiber. The multiple stretching is a method for removing the internal stress of the fiber in the stretching process and then stretching, which is beneficial to improving the stability of the fiber and further improving the physical and mechanical properties of the fiber.

Drawings

FIG. 1 is a schematic process flow diagram of the present invention.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the embodiments.

The invention provides a preparation method of a konjak mask base cloth, which roughly comprises the steps as shown in figure 1.

Example 1:

s1, adding purified konjac powder and PVA (polyvinyl alcohol) which account for 3% and 1% of the mass of distilled water into the distilled water, mechanically stirring and dissolving for 1h, and then vacuumizing and defoaming for 1h to obtain a spinning solution, wherein the molecular weight of the purified konjac powder is 12000, and the molecular weight of the PVA is 80000.

S2, weighing distilled water with the same mass as the spinning solution, weighing calcium hydroxide powder according to 0.15% of the mass of the distilled water, dissolving the calcium hydroxide powder into the distilled water, controlling the pH value to be 12, then weighing genipin according to 1% of the total weight of the solution, dissolving the genipin into the solution to obtain an alkaline gel solution, weighing distilled water with the same mass as the spinning solution, weighing citric acid with the mass of 0.1% of the mass of the distilled water, dissolving the citric acid into the distilled water to obtain an acidic water washing solution, and controlling the pH value to be 2.7-2.8; and weighing distilled water with the same mass as the spinning solution as the neutral washing solution.

And S3, spinning the spinning stock solution prepared in the step S1 through a spinning machine, wherein the diameter of a spinneret orifice of the spinning machine is 0.05mm, then pouring the spinning stock solution into the alkaline gel solution prepared in the step S2, wherein the gel temperature is 90 ℃, and the solidification time is 5min, so as to obtain the nascent fiber.

And S4, introducing the nascent fiber obtained in the step S3 into the acidic washing solution prepared in the step S2 after primary drafting, wherein the drafting multiple of the primary drafting is 2 times, the temperature of the acidic washing solution is 25 ℃, the solidification time is 5min, and then carrying out secondary drafting, neutral washing solution, alkaline washing solution, drying and winding to obtain the glucomannan fiber, wherein the drafting multiple of the secondary drafting of the nascent fiber is 1.1 times, the washing time of the neutral washing solution of the nascent fiber is 3min, the drying temperature of the nascent fiber is 60 ℃, and the drying time is 2min.

S5, weighing edible gum according to 4% of the mass of distilled water, weighing purified konjac powder according to 2%, propylene glycol and glycerol according to 8%, weighing glucomannan fiber obtained in the S4 according to 10%, adding the weighed materials into distilled water, mechanically stirring and dissolving for 1h to obtain viscous feed liquid, injecting the viscous feed liquid into a die of the mask base cloth, and steaming and boiling for 1h in a damp-heat steam bath environment to obtain the preliminarily-formed mask base cloth.

The embodiment also provides a konjak mask, which is prepared by heating 80% of water, 5% of collagen and 10% of glycerol by mass until the materials are completely dissolved, uniformly stirring, cooling to 45 ℃, adding 2% of nano-silver solution, 1% of konjak ceramide, 1% of oat kernel extract and 1% of echinacea purpurea extract, uniformly stirring, and adjusting the pH value to 5.5 by using citric acid. And (5) immersing the finished konjak mask base cloth prepared in the steps (S1-S6) into the essence to obtain the konjak mask.

Example 2:

s1, adding purified konjac powder and PVA (polyvinyl alcohol) which account for 4% and 2% of the mass of distilled water into the distilled water, mechanically stirring and dissolving for 1h, and then vacuumizing and defoaming for 2h to obtain a spinning solution, wherein the molecular weight of the purified konjac powder is 15000, and the molecular weight of the PVA is 100000.

S2, weighing distilled water with the same mass as the spinning solution, weighing potassium hydroxide powder according to 0.15% of the mass of the distilled water, dissolving the potassium hydroxide powder into the distilled water, controlling the pH value to be 13, then weighing genipin according to 1% of the total weight of the solution, dissolving the genipin into the solution to obtain an alkaline gel solution, weighing distilled water with the same mass as the spinning solution, weighing acetic acid with the mass of 0.2% of the mass of the distilled water, controlling the pH value to be about 2.74, and dissolving the acetic acid in the distilled water to obtain an acidic washing solution; and weighing distilled water with the same mass as the spinning solution as a neutral washing solution.

And S3, spinning the spinning stock solution prepared in the step S1 through a spinning machine, wherein the diameter of a spinneret orifice of the spinning machine is 0.08mm, then pouring the spinning stock solution into the alkaline gel solution prepared in the step S2, wherein the gel temperature is 95 ℃, and the solidification time is 10min, so as to obtain the nascent fiber.

And S4, introducing the primary fiber obtained in the step S3 into the acidic water washing solution prepared in the step S2 after primary drafting, wherein the drafting multiple of the primary drafting is 4 times, the temperature of the acidic water washing solution is 60 ℃, the solidification time is 10min, and then carrying out secondary drafting, neutral water washing solution, alkaline water washing solution, drying and winding to obtain the glucomannan fiber, wherein the drafting multiple of the secondary drafting of the primary fiber is 1.5 times, the washing time of the neutral water washing solution of the primary fiber is 5min, the drying temperature of the primary fiber is 90 ℃, and the drying time is 3min.

S5, weighing edible gum according to 5% of the mass of distilled water, weighing purified konjac powder according to 3%, propylene glycol and glycerol according to 9%, weighing glucomannan fiber obtained in the S4 according to 15%, adding the weighed materials into distilled water, mechanically stirring and dissolving for 1h to obtain viscous feed liquid, injecting the viscous feed liquid into a die of the mask base cloth, and steaming and boiling for 2h in a damp-heat steam bath environment to obtain the preliminarily-formed mask base cloth.

The embodiment also provides a konjac facial mask, which is prepared by heating 85% of water, 3% of collagen and 6% of glycerol to be completely dissolved, uniformly stirring, cooling to 50 ℃, adding 1.8% of nano-silver solution, 0.1% of konjac ceramide, 0.5% of oat kernel extract, 0.6% of dendrobium nobile extract, 1% of aloe barbadensis leaf extract, 1% of sophora flavescens root extract and 1% of lycium barbarum fruit extract, uniformly stirring, and adjusting the pH to 6.5 by using citric acid. And (5) immersing the finished konjak mask base cloth prepared in the steps (S1-S6) into the essence to obtain the konjak mask.

Example 3:

s1, adding purified konjac powder and PVA (polyvinyl alcohol) which account for 3.5 percent and 1.5 percent of the mass of distilled water into the distilled water, mechanically stirring and dissolving for 1 hour, and then vacuumizing and defoaming for 1.5 hours to obtain a spinning solution, wherein the molecular weight of the purified konjac powder is 13500, and the molecular weight of the PVA is 90000.

S2, weighing distilled water with the same mass as the spinning solution, weighing sodium hydroxide powder according to 0.15% of the mass of the distilled water, dissolving the sodium hydroxide powder into the distilled water, controlling the pH value to be 12.5, then weighing genipin according to 1% of the total weight of the solution, dissolving the genipin into the solution to obtain an alkaline gel solution, weighing distilled water with the same mass as the spinning solution, weighing malic acid with the mass of 0.15% of the mass of the distilled water, controlling the pH value to be 2.78, and dissolving the malic acid into the distilled water to obtain an acidic washing solution; and weighing distilled water with the same mass as the spinning solution as a neutral washing solution.

And S3, spinning the spinning stock solution prepared in the step S1 through a spinning machine, wherein the diameter of a spinneret orifice of the spinning machine is 0.06mm, then pouring the spinning stock solution into the alkaline gel solution prepared in the step S2, wherein the gel temperature is 93 ℃, and the solidification time is 8min, so as to obtain the nascent fiber.

And S4, introducing the primary fiber obtained in the step S3 into the acidic water washing solution prepared in the step S2 after primary drafting, wherein the drafting multiple of the primary drafting is 3 times, the temperature of the acidic water washing solution is 45 ℃, the solidification time is 8min, and then carrying out secondary drafting, neutral water washing solution, alkaline water washing solution, drying and winding to obtain the glucomannan fiber, wherein the drafting multiple of the secondary drafting of the primary fiber is 1.3 times, the washing time of the neutral water washing solution of the primary fiber is 4min, the drying temperature of the primary fiber is 75 ℃, and the drying time is 2.5min.

S5, weighing edible gum according to 4.5% of the mass of distilled water, weighing purified konjac powder according to 2.5%, weighing propylene glycol and glycerol according to 8.5%, weighing glucomannan fiber obtained in the S4 according to 12.5%, adding weighed materials into distilled water, mechanically stirring and dissolving for 1 hour to obtain viscous material liquid, injecting the viscous material liquid into a mould of the mask base cloth, and cooking for 1.5 hours in a damp-heat steam bath environment to obtain the preliminarily-formed mask base cloth.

The embodiment also provides a konjak mask, which is prepared by heating 83% of water, 4% of collagen and 8% of glycerin to be completely dissolved, uniformly stirring, cooling to 48 ℃, adding 1.5% of nano-silver solution, 0.5% of konjak ceramide, 0.3% of oat kernel extract, 1% of dendrobium nobile extract, 0.3% of aloe barbadensis leaf extract, 0.5% of sophora flavescens root extract, 0.5% of wolfberry fruit extract and 0.4% of echinacea purpurea extract, uniformly stirring, and adjusting the pH to 6 by using citric acid. And (5) immersing the finished konjak mask base cloth prepared in the steps (S1-S6) into the essence to obtain the konjak mask.

Comparative example 1:

a konjac mask base fabric was prepared according to the method in patent document 201910565664.5.

(1) Weighing 12.6kg of pure water in a stirring pot, adding 100g of guar gum and 116g of carrageenan, stirring until the guar gum and the carrageenan are completely dissolved, adjusting the stirring speed to 1200r/min, adding 500g of pine bark extract, 600g of aloe extract, 400g of rose extract and 494g of chitosan into the stirring pot while stirring, adding 3.24kg of konjac glucomannan after uniformly stirring, and continuously stirring for 8min to obtain uniform viscous feed liquid;

(2) Injecting the viscous liquid prepared in the step (1) into a KM245 mask mould through a filling machine, rotating until the liquid uniformly covers the whole mould, stacking every 10 films, stacking every 5 films, placing every 24 films in a transposition vehicle, pushing the transposition vehicle into a steam room, opening a steam valve to introduce steam into the steam room, slowly raising the temperature in the steam room to 45 ℃, adjusting the steam valve to stabilize the temperature in the steam room between 43 and 47 ℃, and placing the transposition vehicle for 12 hours in the temperature environment to obtain a formed mask base fabric;

(3) Taking out the formed mask base cloth from the mold, placing the mask base cloth in pure water for washing, then centrifugally dewatering, then irradiating for 6 hours by adopting Co-60 gamma with the dosage of 2.0kGy to obtain the konjak mask base cloth, cutting the prepared konjak mask base cloth by using a cutting machine, and then carrying out vacuum sealing packaging to obtain the konjak mask base cloth product.

Comparative example 2:

(1) Weighing 36.4kg of pure water in a stirring pot, adding 150g of xanthan gum, 150g of pectin and 100g of arabic gum, stirring until the xanthan gum, the pectin and the arabic gum are completely dissolved, adjusting the stirring speed to 1800r/min, adding 400g of kadsura longipedunculata extract and 800g of green tea extract into the stirring pot while stirring, adding 2kg of konjac glucomannan after uniformly stirring, and continuously stirring for 6min to obtain uniform viscous feed liquid.

(2) Injecting the viscous liquid prepared in the step (1) into a KM245 facial mask die through a filling machine, rotating until the liquid uniformly covers the whole die, stacking every 10 films and every 5 films, placing every 24 films in a transposition vehicle, pushing the transposition vehicle into a steam room, opening a steam valve to introduce steam into the steam room, slowly raising the temperature in the steam room to 60 ℃, adjusting the steam valve to stabilize the temperature in the steam room at 58-62 ℃, and placing the transposition vehicle for 10 hours in the temperature environment to obtain the formed facial mask base cloth.

(3) And taking out the formed mask base cloth from the mold, placing the mask base cloth into pure water for washing, performing centrifugal dehydration, irradiating for 10 hours by using Co-60 gamma with the dosage of 1.5kGy to obtain the konjak mask base cloth, cutting the prepared konjak mask base cloth by using a cutting machine, and performing vacuum sealing and packaging to obtain the konjak mask base cloth product.

The konjak mask base cloth produced in the above 5 sets of examples was subjected to experiments on mechanical properties, moisture retention, and water absorption. The detection method comprises the following steps:

1. breaking strength and elongation at break

Testing an instrument: constant speed traction type strong experiment machine (CRT or CRE)

Measurement experiment conditions: the temperature and humidity of the test environment are required to be constant during the test, the suitable temperature is determined to be 20 +/-1 ℃, and the relative humidity is 40-60%.

Test samples: example 1, example 2, example 3, comparative example 1, comparative example 2

The measuring method comprises the following steps: cutting the sample into a plurality of samples of 5cm multiplied by 30cm, and respectively testing on a strength machine to obtain the strength and the relative elongation of each sample.

The operation method comprises the following steps: one end of a sample is placed in an upper clamp, the sample is lightly clamped, the other end of the sample is placed in a lower clamp, a 30g pre-tensioned heavy hammer is hung at the lower end of the sample, then the upper clamp is slightly loosened to enable the sample to be straightened by the gravity of the heavy hammer, the upper clamp and the lower clamp are clamped, the heavy hammer is taken down to start a machine, the lower clamp is pulled downwards at a certain speed, and when the sample is fractured, the fracture strength and the fracture elongation are recorded. The breaking strength is accurate to 0.1N, and the breaking elongation is accurate to 0.1%.

2. Difference in weight and tewameter value

The measuring instrument is as follows: tewameter TM210

Measurement of the subjects: the subjects were healthy female volunteers aged 20-40 years without a history of skin disease.

Measurement experiment conditions: the temperature and humidity of the test environment are required to be constant during the test period, the suitable temperature is measured to be 20 +/-1 ℃, the relative humidity is 40-60%, and a volunteer needs to enter the test environment in advance before the test and have a rest for 30min.

The test method comprises the following steps: the transdermal water loss evaporation value, abbreviated to TEWL value, measured in g/m2h, was measured using a tewameter TM210 (Courage + Khazaha, koln, germany). The TEWL value is an important indicator of the quality of the skin barrier. The lower the TEWL value of the skin, the better the barrier function of the skin and vice versa.

During testing, a plurality of test areas are defined on facial skin, the TEWL value of blank skin in the area is tested, then a test sample is cut to be proper in size and then applied to a designated position, and testing is carried out 30min after the test sample is used. The dimensions of the test sample at each point were 2cm by 2cm. The difference in weight was accurate to 0.01g and the Tewameter value was accurate to 0.1g/m2h.

3. Water absorption rate

Testing the instrument: balance (1000g, 0.001g)

Measurement experiment conditions: the temperature and humidity of the test environment are required to be constant during the test, and the suitable temperature is determined to be 20 +/-1 ℃ and the relative humidity is 40-60%.

The measuring method comprises the following steps: cutting the sample into 5cm multiplied by 5cm, weighing the mass (m 0) of the sample on a balance to be accurate to 0.01g, then weighing the sample, soaking the sample in water for 2h, taking out, wiping off surface moisture by a wringed wet towel, immediately weighing the mass (m 1) of the sample to be accurate to 0.01g, and then calculating the water absorption of the sample according to the following formula:

W＝100％×(m1-m0)/m0

m 0-mass in air of dried sample, g

m 1-mass of water-saturated sample in air, g

The following table shows the comparison of the properties of the examples:

note: the water absorption referred to in this patent is weight water absorption.

As can be seen from examples 1, 2, 3, 1 and 2, the konjac facial mask base cloth manufactured by the method of the present invention has excellent mechanical properties, and the water retention and water absorption of the konjac facial mask base cloth are improved compared to the prior art.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. The preparation method of the konjak mask base cloth is characterized by comprising the following steps:

s1, preparing a spinning solution, adding a proper amount of purified konjac powder and PVA (polyvinyl alcohol) into distilled water, stirring and dissolving, and then defoaming to obtain the spinning solution;

s2, weighing distilled water with the same mass as the spinning solution, weighing a proper amount of alkaline powder, dissolving the alkaline powder into the distilled water, then dissolving genipin into the solution to obtain an alkaline gel solution, weighing distilled water with the same mass as the spinning solution, weighing a proper amount of edible acid, and dissolving the edible acid into the distilled water to obtain an acidic water washing solution; weighing distilled water with the same mass as the spinning solution as a neutral washing solution;

s3, spinning the spinning stock solution prepared in the step S1 through a spinning machine, and then pouring the spinning stock solution into the alkaline gel solution prepared in the step S2 to obtain nascent fibers;

s4, introducing the nascent fiber obtained in the step S3 into the acidic washing solution prepared in the step S2 after primary drafting, and then carrying out secondary drafting, neutral washing solution and alkaline washing solution, drying and winding to obtain glucomannan fiber;

s5, taking a proper amount of distilled water, weighing edible gum, purified konjac powder, propylene glycol, glycerol, a gel additive and glucomannan fiber obtained in the step S4, adding the materials into the distilled water, stirring and dissolving to obtain viscous material liquid, injecting the viscous material liquid into a die of the mask base cloth, and steaming to obtain the preliminarily formed mask base cloth;

s6, cleaning, sterilizing and cutting the preliminarily formed mask base cloth prepared in the S5 to obtain a finished product of the konjak mask base cloth;

in the step S1, the mass of purified konjac powder and the mass of PVA are respectively 3% -4% and 1% -2% of the mass of distilled water, the molecular weight of the purified konjac powder is 12000-15000, the molecular weight of the PVA is 80000-100000, the time of mechanical stirring and dissolving is 1h, and the defoaming method is vacuumizing and defoaming for 1-2 h;

in the step S4, the drafting multiple of the first drafting is 2-4 times, the temperature of an acid washing solution is 25-60 ℃, the solidification time is 5-10 min, the drafting multiple of the second drafting of the nascent fiber is 1.1-1.5 times, the washing time of a neutral washing solution of the nascent fiber is 3-5 min, the drying temperature of the nascent fiber is 60-90 ℃, and the drying time is 2-3 min;

2. The method for preparing a konjak mask base cloth according to claim 1, comprising: in the step S2, when preparing the alkaline gel solution, the mass of the alkaline powder is 0.15 percent of the mass of the distilled water, the pH value is 12-13, the mass of the genipin is 1 percent of the total mass of the solution, and when preparing the acidic water washing solution, the mass of the edible acid is 0.1-0.2 percent of the mass of the distilled water.

3. The method for preparing a konjak mask base cloth according to claim 1, comprising: in the step S3, the gelling temperature is 90-95 ℃, and the coagulation time is 5-10 min.

4. The method for preparing a konjak mask base cloth according to claim 1, comprising: in the step S3, the diameter of the spinneret orifice of the spinning machine is 0.05-0.08 mm.

5. The konjak mask is characterized in that: which comprises essence and the konjak mask base cloth prepared by the method for preparing the konjak mask base cloth according to any one of claims 1 to 4.

6. The konjak mask of claim 5, wherein: the essence is prepared by heating 80-85% of water, 3-5% of collagen and 6-10% of glycerol to be completely dissolved, uniformly stirring, cooling to 45-50 ℃, adding 1.5-2% of nano-silver solution, 0.1-1% of konjak ceramide, 0.3-1% of oat kernel extract, 0-1% of dendrobium nobile extract, 0-1% of aloe barbadensis leaf extract, 0-1% of sophora flavescens root extract, 0-1% of lycium barbarum fruit extract and 0-1% of echinacea purpurea extract, uniformly stirring, and adjusting the pH to 5.5-6.5 by using citric acid.