WO2021017055A1 - Water-absorbing membrane material and preparation method therefor - Google Patents

Abstract

A water-absorbing membrane material, comprising gel sponge and fibers, the gel sponge being composed of the following components in parts by weight: 0.05-4 parts of glucomannan, 0.2-6 parts of carrageenan, 0.1-0.8 part of locust bean gum, 0.01-0.5 part of xanthan gum, 0.1-1.2 parts of potassium chloride, 0.01-1.5 parts of citric acid, 0.1-5 parts of glycerol, 0.01-0.1 part of hexylene glycol, and 2-10 parts of water, the fibers being polypropylene fibers. The water absorption rate of the membrane material reaches up to 19.4, the tensile strength reaches up to 0.25 MPa, and the elongation rate of the membrane material reaches up to 167.62%. The membrane material is applicable to the fields of facial masks, sanitary napkins, and medical dressings.

Description

Water-absorbing membrane material and preparation method thereof Technical field

The invention belongs to the field of membrane materials, and particularly relates to a water-absorbing membrane material and a preparation method thereof.

Background technique

The membrane materials used in the field of facial masks have the advantages of naturalness, no carrier, and good skin feel, but they also have some disadvantages. For example, in the process of preparing a facial mask, the membrane materials also absorb liquid effective substances (such as essence). The membrane material in the technology has a small amount of absorption of liquid effective substances such as essence, which is not conducive to maintaining the long-term effectiveness of the mask. In addition, the membrane materials described in the prior art have poor mechanical properties, weak stretch resistance, and easy breakage, which further restricts the application of membrane materials.

Therefore, providing a membrane material with strong adsorption capacity and good mechanical properties, especially good tensile properties, is beneficial to expand the application fields of membrane materials and improve the performance of products containing membrane materials.

Summary of the invention

Aiming at the shortcomings of the prior art, the present invention provides a water-absorbing membrane material and a preparation method thereof. The film material of the present invention has strong water absorption capacity, the water absorption rate is as high as 19.4, the tensile strength is as high as 0.25 MPa, and the elongation rate of the film material is as high as 167.62%.

A water-absorbing membrane material comprises gel sponge and fibers, and the fibers are built in the gel sponge.

The gel sponge, in parts by weight, consists of the following components:

Preferably, the gel sponge is composed of the following components in parts by weight:

Preferably, the carrageenan is K-type and/or I-type carrageenan.

Preferably, the water is deionized water.

Preferably, the fiber is polypropylene fiber. The fibers are not limited to polypropylene fibers, but may also be other fibers.

Preferably, the length of the polypropylene fiber is greater than 10 mm; further preferably, the length of the polypropylene fiber is 50-300 mm.

Preferably, in the film material, the thickness of the gel sponge is 0.1-1 mm.

Preferably, in the film material, the thickness of the fiber is 0.1-0.5 mm.

A preparation method of water-absorbing membrane material includes the following steps:

(1) Preparation of material liquid: Weigh each component according to the formula, mix water, citric acid, potassium chloride and glycerin, then heat and keep warm to prepare mixture A; combine glucomannan, carrageenan, xanthan Gum and locust bean gum are mixed to obtain mixture B, then mixture B is added to mixture A, heated, kept warm, and then cooled down, and hexanediol is added to prepare a liquid for use;

(2) Foaming: heating the material liquid obtained in step (1), and inputting gas into the material liquid to prepare a foaming liquid for use;

(3) Coating: Add the foaming liquid obtained in step (2) into the molding machine, which contains an extrusion die (the number of extrusion die heads can be one or more), and the foaming liquid is removed from the molding machine The extrusion die head is extrusion coated on the conveyor belt of the molding machine, and then the fiber is added, and when it passes through the extrusion die, the extrusion die again extrudes the foaming liquid and coats it on the fiber to make a film material Bold

(4) Foam breaking: the film material obtained in step (3) is subjected to foam breaking treatment and then dried to prepare the film material.

Specifically, a method for preparing a fiber-containing membrane material includes the following steps:

(1) Preparation of material liquid: Weigh each component according to the formula, add water, citric acid, potassium chloride and glycerin, then heat to 50-70°C and keep it for 30-50 minutes to prepare mixture A; Glycan, carrageenan, xanthan gum and locust bean gum are mixed to prepare mixture B, then mixture B is added to mixture A, heated to 80-100°C, kept for 1-3 hours, and then cooled to 60-80°C, Add hexanediol to prepare the feed liquid for use;

(2) Foaming: heat the material liquid obtained in step (1) to 40-90℃, and input air into the material liquid through a foaming machine (provided by Foshan Yalusi Industrial Equipment Co., Ltd., model A1000) , The pump speed of the foaming machine is 500-5000 rpm, and the flow rate of the material liquid is 5-200L/H, to obtain the foaming liquid;

(3) Coating: Add the foaming liquid obtained in step (2) into the molding machine (provided by Foshan Fengtuo Mould Machinery Co., Ltd., model 1200). The molding machine contains at least 2 extrusion die heads. The foam liquid is extruded and coated on the conveyor belt of the molding machine from the first extrusion die of the molding machine, and then the fibers are added. After passing through the second extrusion die, the second extrusion die extrudes the foaming liquid again. Coated on the fiber to make the membrane material bold;

(4) Foam breaking: Put the membrane material obtained in step (3) in the foam breaking machine (provided by Dongguan Licheng Machinery Equipment Co., Ltd., model LC600-9). The bubbles on the surface of the body are subjected to bubble breaking treatment and then dried to prepare the membrane material (the membrane material contains gel sponge and fibers).

Preferably, the density of the foaming liquid in step (2) is 0.1 g/cm ³ -1.0 g/cm ³ .

Preferably, in step (2), the flow of air input into the material liquid through the foaming machine is 0-2000L/H.

Preferably, in step (3), the fibers are added through the skeleton die of the forming machine.

Preferably, when the foaming liquid is extruded from the extrusion die in step (3), the temperature of the foaming liquid is 30-70°C.

Preferably, the foam breaking roller of the foam breaking machine in step (4) adopts a vertical and horizontal anilox roller.

Preferably, in step (4), the temperature of the film material is controlled at 5-50°C when the bubbles are broken.

Preferably, in step (4), the conveying speed of the film material in the bubble breaker is 1m/min-30m/min.

Preferably, the drying in step (4) is maintained at 40-60°C for 60-120 minutes.

The addition of locust bean gum can significantly improve the performance of the membrane material of the present invention. The addition of xanthan gum can make the skin feel of the membrane material softer.

The film material of the present invention can be used in facial masks and sanitary napkins for women.

A facial mask can be prepared by applying essence to the membrane material gel sponge of the present invention.

In addition, the film material of the present invention has a good water absorption rate and can be used in medical dressings.

Compared with the prior art, the beneficial effects of the present invention are as follows:

The water absorption rate of the membrane material of the invention is as high as 19.4, the tensile strength is as high as 0.25 MPa, and the elongation rate of the membrane material is as high as 167.62%.

Detailed ways

In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for description. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

Example 1

A water-absorbing membrane material comprises gel sponge and fibers, and the fibers are built in the gel sponge.

The gel sponge, in parts by weight, consists of the following components:

The carrageenan is K-type carrageenan.

The fiber is polypropylene fiber.

The length of the polypropylene fiber is 80-100 mm.

In the film material, the thickness of the gel sponge is 0.3 mm.

In the film material, the thickness of the fiber is 0.1 mm.

A preparation method of water-absorbing membrane material includes the following steps:

(1) Preparation of material liquid: Weigh each component according to the formula, add water, citric acid, potassium chloride and glycerin, then heat to 55°C and keep it for 50 minutes to prepare mixture A; Gum, xanthan gum and locust bean gum were mixed to prepare mixture B, then mixture B was added to mixture A, heated to 80°C, kept for 2 hours, and then cooled to 60°C, added hexanediol to obtain a liquid mixture, spare;

(2) Foaming: heating the material liquid obtained in step (1) to 50°C, and inputting air into the material liquid through the foaming machine, and the pump speed of the foaming machine is 600 rpm to prepare the foaming liquid;

(3) Coating: Add the foaming liquid prepared in step (2) into the molding machine. The molding machine contains two extrusion die heads. The foaming liquid is extruded and coated on the first extrusion die of the molding machine. On the conveyor belt of the forming machine, the fiber is then added, and when it passes through the second extrusion die, the second extrusion die again extrudes the foaming liquid and coats it on the fibers to obtain a thick film material;

(4) Foam breaking: the film material obtained in step (3) is placed in a foam breaking machine, and the foam breaking machine performs foam breaking treatment on the air bubbles on the surface of the film material, and then drying to prepare the film material .

The density of the foaming liquid in step (2) is 0.5 g/cm ³ -1.0 g/cm ³ .

In step (2), the flow of air input into the material liquid through the foaming machine is 40L/H.

In step (3), fibers are added through the skeleton die of the forming machine.

When extruding the foaming liquid from the extrusion die in step (3), the temperature of the foaming liquid was 35°C.

In step (4), the foam breaking roller of the foam breaking machine adopts a vertical and horizontal anilox roller.

In step (4), the temperature of the film material is controlled at 20°C when the bubbles are broken.

In step (4), the conveying speed of the film material in the bubble breaker is 10m/min.

The drying in step (4) is kept at 40°C for 120 minutes.

Example 2

A water-absorbing membrane material comprises gel sponge and fibers, and the fibers are built in the gel sponge.

The gel sponge, in parts by weight, consists of the following components:

The carrageenan is type I carrageenan.

The fiber is polypropylene fiber.

The length of the polypropylene fiber is 100-120 mm.

In the film material, the thickness of the gel sponge is 0.5 mm.

In the film material, the thickness of the fiber is 0.1 mm.

A preparation method of water-absorbing membrane material includes the following steps:

(1) Preparation of material liquid: Weigh each component according to the formula, add water, citric acid, potassium chloride and glycerin, and then heat to 60°C and keep it for 40 minutes to prepare mixture A; Gum, xanthan gum and locust bean gum are mixed to prepare mixture B, then mixture B is added to mixture A, heated to 90°C, kept for 2 hours, then cooled to 70°C, added hexylene glycol, and prepared liquid, spare;

(2) Foaming: heating the material liquid obtained in step (1) to 80°C, and inputting air into the material liquid through the foaming machine, and the pump speed of the foaming machine is 1000 revolutions/min to prepare the foaming liquid;

(3) Coating: Add the foaming liquid prepared in step (2) into the molding machine. The molding machine contains two extrusion die heads. The foaming liquid is extruded and coated on the first extrusion die of the molding machine. On the conveyor belt of the forming machine, the fiber is then added, and when it passes through the second extrusion die, the second extrusion die again extrudes the foaming liquid and coats it on the fibers to obtain a thick film material;

(4) Foam breaking: the film material obtained in step (3) is placed in a foam breaking machine, and the foam breaking machine performs foam breaking treatment on the air bubbles on the surface of the film material, and then drying to prepare the film material .

The density of the foaming liquid in step (2) is 0.8 g/cm ³ -0.9 g/cm ³ .

In step (2), the flow of air input into the material liquid through the foaming machine is 30L/H.

In step (3), fibers are added through the skeleton die of the forming machine.

When extruding the foaming liquid from the extrusion die in step (3), the temperature of the foaming liquid was 50°C.

In step (4), the foam breaking roller of the foam breaking machine adopts a vertical and horizontal anilox roller.

In step (4), the temperature of the film material is controlled at 40°C when the bubbles are broken.

In step (4), the conveying speed of the film material in the bubble breaker is 15m/min.

The drying in step (4) is maintained at 50°C for 80 minutes.

Example 3

A water-absorbing membrane material comprises gel sponge and fibers, and the fibers are built in the gel sponge.

The gel sponge, in parts by weight, consists of the following components:

The carrageenan is 0.2 parts of K-type carrageenan and 0.3 parts of I-type carrageenan.

The fiber is polypropylene fiber.

The length of the polypropylene fiber is 120-150 mm.

In the film material, the thickness of the gel sponge is 0.5 mm.

In the film material, the thickness of the fiber is 0.1 mm.

A preparation method of water-absorbing membrane material includes the following steps:

(1) Preparation of material liquid: Weigh the components according to the formula, add water, citric acid, potassium chloride and glycerin, then heat to 70°C and keep for 50 minutes to prepare mixture A; Gum, xanthan gum and locust bean gum were mixed to prepare mixture B, then mixture B was added to mixture A, heated to 100°C, kept for 1 hour, and then cooled to 60°C, added hexanediol to obtain a liquid mixture, spare;

(2) Foaming: heating the material liquid obtained in step (1) to 70°C, and inputting air into the material liquid through the foaming machine, and the pump speed of the foaming machine is 800 revolutions/min to prepare the foaming liquid;

(3) Coating: Add the foaming liquid prepared in step (2) into the molding machine. The molding machine contains two extrusion die heads. The foaming liquid is extruded and coated on the first extrusion die of the molding machine. On the conveyor belt of the forming machine, the fiber is then added, and when it passes through the second extrusion die, the second extrusion die again extrudes the foaming liquid and coats it on the fibers to obtain a thick film material;

(4) Foam breaking: the film material obtained in step (3) is placed in a foam breaking machine, and the foam breaking machine performs foam breaking treatment on the air bubbles on the surface of the film material, and then drying to prepare the film material .

The density of the foaming liquid in step (2) is 0.5 g/cm ³ -0.6 g/cm ³ .

In step (2), the flow rate of air input into the material liquid through the foaming machine is 50L/H.

In step (3), fibers are added through the skeleton die of the forming machine.

When extruding the foaming liquid from the extrusion die in step (3), the temperature of the foaming liquid was 40°C.

In step (4), the foam breaking roller of the foam breaking machine adopts a vertical and horizontal anilox roller.

In step (4), the temperature of the film material is controlled at 30°C when the bubbles are broken.

In step (4), the conveying speed of the film material in the bubble breaker is 20m/min.

The drying in step (4) is kept at 40°C for 120 minutes.

Comparative example 1

Compared with Example 2, in Comparative Example 1, no polypropylene fiber was added, and the rest of the preparation process was the same as Example 2.

Comparative example 2

Compared with Example 2, in the process of preparing the membrane material in Comparative Example 2, step (1) prepare the material liquid: weigh the components according to the formula, and then directly mix the components, heat to 90°C, and keep the temperature for 2 Hours, the material liquid is prepared. The rest of the preparation process is the same as in Example 2.

Comparative example 3

Compared with Example 2, Comparative Example 3 does not contain locust bean gum, and the rest of the preparation process is the same as Example 2.

Comparative example 4

Compared with Example 2, in Comparative Example 4, there are 8 parts of glucomannan, 0.1 part of carrageenan, and 1 part of locust bean gum. The rest of the preparation process is the same as that of Example 2.

Product effect test

The membrane materials prepared in Examples 1-3 and Comparative Examples 1-4 were tested for water absorption performance according to the GB/T8939-2008 standard. The results are shown in Table 1 (the water absorption rate is used to measure the water absorption performance of the membrane material, and the greater the water absorption rate is It shows that the water absorption performance of the membrane material is better).

Table 1:

To	Example 1	Example 2	Example 3	Comparative example 1	Comparative example 2	Comparative example 3	Comparative example 4
Water absorption rate	18.9	19.4	19.2	17.9	7.5	7.6	12.5

It can be seen from Examples 1-3 and Comparative Examples 2-3 in Table 1 that the order of addition of the components and the treatment temperature in the process of preparing the feed liquid in step (1) greatly affect the water absorption performance of the membrane material. It can be seen from the results of Example 2 and Comparative Example 4 that the contents of glucomannan, carrageenan, and locust bean gum also affect the water absorption performance of the membrane material. From the results of Example 2 and Comparative Example 1, it can be seen that although polypropylene fibers have little effect on the water absorption performance of the membrane material, they also have a certain effect.

Take the film materials prepared in Examples 1-3 and Comparative Examples 1-4 and place them between the two clamps of the tensile machine (the distance between the two clamps is 100mm), and the stretching speed is 100±10mm/min to stretch the film materials , Test the tensile strength (force per unit area) of the membrane material σ=F/(b*d), where σ: tensile strength (MPa); F: force value (N); b: width (mm); d: thickness (mm), also test the elongation of the film material: ε = I ₁ /I ₀ *100%, where ε: deformation rate or elongation at break (%); I ₁ : stretched length (mm) ; I ₀ : the distance between the two clamps (mm), the measured results are shown in Table 2.

Table 2:

It can be seen from the results of Examples 1-3 and Comparative Example 1 in Table 2 that the presence of polypropylene fibers has a very important effect on the tensile strength and elongation of the film material. It can be seen from the results of Example 2 and Comparative Examples 2-4 that the change of the components or the amount of the components of the gel sponge or the treatment of the components also have a certain effect on the tensile strength and elongation of the film material. influences.

In addition, compared with Example 2, the polypropylene fiber was replaced with polyvinyl chloride fiber, the remaining components were unchanged, and the preparation method was unchanged. According to the above-mentioned test method, the results showed that the film prepared with polyvinyl chloride fiber The water absorption ratio of the material is 16.5, the tensile strength is 0.15 MPa, and the elongation is 145.72%. It can be seen that the performance of membrane materials prepared by replacing polypropylene fibers with polyvinyl chloride fibers is relatively poor.

In addition, compared with Example 2, the type I carrageenan was replaced by the L type carrageenan, and the remaining components were unchanged, and the preparation method was unchanged. According to the above-mentioned test method, the results showed that the polyvinyl chloride fiber prepared The water absorption rate of the membrane material is 18.5.

The film material prepared in Example 2 was applied to sanitary napkins, and under the same conditions, the water absorption was tested with commercially available sanitary napkins (commercial sanitary napkins do not contain glucomannan, carrageenan, and locust bean gum at the same time). As a result, the water absorption of the sanitary napkin containing the film material prepared in Example 2 is 5-7 times that of the commercially available sanitary napkin.

Claims (10)

1. A water-absorbing membrane material characterized by comprising gel sponge and fiber.
2. The membrane material according to claim 1, wherein the gel sponge is composed of the following components in parts by weight:

   
3. The film material of claim 2, wherein the carrageenan is K-type and/or I-type carrageenan.
4. The membrane material of claim 1, wherein the thickness of the gel sponge is 0.1-1 mm.
5. The membrane material of claim 1, wherein the length of the fiber is greater than 10 mm.
6. The film material according to claim 1, wherein the fibers are polypropylene fibers.
7. A method for preparing a membrane material is characterized in that it comprises the following steps:

   (1) Preparation of material liquid: Weigh each component according to the formula, mix water, citric acid, potassium chloride and glycerin, then heat and keep warm to prepare mixture A; combine glucomannan, carrageenan, xanthan Gum and locust bean gum are mixed to obtain mixture B, then mixture B is added to mixture A, heated, kept warm, and then cooled down, and hexanediol is added to prepare a liquid for use;

   (2) Foaming: heating the material liquid obtained in step (1), and inputting gas into the material liquid to prepare a foaming liquid for use;

   (3) Coating: Add the foaming liquid prepared in step (2) into the molding machine, the molding machine contains an extrusion die, and the foaming liquid is extruded and coated on the conveyor belt of the molding machine from the extrusion die of the molding machine Then add the fiber, and when it passes through the extrusion die, the extrusion die once again extrudes the foaming liquid to obtain a thick film material;

   (4) Foam breaking: the crude membrane material obtained in step (3) is subjected to foam breaking treatment, and then dried to obtain the membrane material according to any one of claims 1-6.
8. The preparation method according to claim 7, characterized in that, in step (1), each component is weighed according to the formula, water, citric acid, potassium chloride and glycerin are added, and then heated to 50-70°C and kept at 30°C. -50 minutes to prepare mixture A; mix glucomannan, carrageenan, xanthan gum and locust bean gum to prepare mixture B, then add mixture B to mixture A, heat to 80-100°C, keep warm for 1 -3 hours, then lower the temperature to 60-80°C, add hexanediol to prepare the feed liquid.
9. The preparation method according to claim 7, wherein the pump speed of the foaming machine in step (2) is 500-5000 rpm; the density of the foaming liquid in step (2) is 0.1 g/cm ^3- 1.0g / cm ^3; drying step (4) is kept at 40-60 ℃ 60-120 minutes.
10. An application of the membrane material according to any one of claims 1 to 6, characterized in that the membrane material is applied to facial masks, sanitary napkins and/or dressings.