Preparation method of nano mesoscopic microporous hot melt adhesive ultrathin zero-carbon composite film

Abstract

The invention relates to a preparation method of a nano mesoscopic microporous hot melt adhesive ultrathin zero-carbon composite membrane, and relates to the technical field of hygienic products, and the preparation method comprises the following steps: a compounding step: compounding a degradable hot melt adhesive, a degradable surface layer and a degradable bottom layer to obtain a composite membrane, the width of the hot melt adhesive is smaller than that of the degradable surface layer, and the width of the degradable surface layer is equal to that of the degradable bottom layer; and a cutting step: cutting the edge of the composite film. The preparation method has the advantages that the degradable, zero-carbon and environment-friendly effects are realized, and mesoscopic micropores (micron-sized) are formed through the nano material, so that the good air permeability can be realized.

Description

Technical Field

[0001] This application relates to the technical field of hygiene products, and in particular to a method for preparing a nano-mesoscopic microporous hot melt adhesive ultrathin zero-carbon composite membrane. Background Technology

[0002] In existing hygiene products, the bottom film is usually made of composite film, such as ordinary non-woven fabric and water-repellent non-woven fabric bonded together by heat sealing or adhesive bonding. However, the bottom film bonded in this way has poor biodegradability. Summary of the Invention

[0003] To address the shortcomings of existing technologies, one of the objectives of this application is to provide a method for preparing ultrathin zero-carbon composite films using nano-mesoporous hot melt adhesives, which has the advantage of better biodegradability.

[0004] The above-mentioned objective of this application is achieved through the following technical solution: A method for preparing a nano-mesoporous hot melt adhesive ultrathin zero-carbon composite film includes the following steps: a composite step: combining a biodegradable hot melt adhesive with a biodegradable top layer and a biodegradable bottom layer to obtain a composite film, wherein the width of the hot melt adhesive is less than the width of the biodegradable top layer, and the width of the biodegradable top layer is equal to the width of the biodegradable bottom layer; and a cutting step: cutting the edges of the composite film.

[0005] By adopting the above technical solution, the composite film is made degradable and more environmentally friendly by combining a degradable hot melt adhesive, a degradable top layer, and a degradable bottom layer.

[0006] In a preferred embodiment, this application may be further configured such that, in the composite step, the biodegradable hot melt adhesive is applied onto the biodegradable substrate after passing through a slot coater, and a biodegradable top layer is applied over the biodegradable substrate to obtain a composite film, wherein the press-bonded biodegradable hot melt adhesive has a microporous structure.

[0007] By adopting the above technical solution, the microporous composite membrane achieves better air permeability.

[0008] In a preferred embodiment, this application may be further configured to include a collection step for collecting the cut edges, and a clamping step for clamping the cut edges before the collection step. When the cut edges reach a preset value, the take-up roller used in the collection step collects the edges.

[0009] By adopting the above technical solution, the overall composite effect of the composite film is improved by cutting off the edges during use. This means that the probability of edge separation of the composite film is lower during use. At the same time, the cut edges are collected, thereby reducing the probability of workshop clutter.

[0010] In a preferred embodiment, this application can be further configured such that, during the collection step, the remaining amount of the cut edge is detected, and if it is less than a preset value, the winding process is stopped.

[0011] By adopting the above technical solution, that is, during the winding process, the winding is carried out when a certain number of cut edges are reached, and the winding is canceled when the number of cut edges is less than a certain number, thereby avoiding the probability of affecting the main body due to pulling the edges during the winding process.

[0012] In a preferred embodiment, this application may be further configured to include a replacement step for replacing a certain amount of take-up drum wound on the take-up shaft.

[0013] By adopting the above technical solution, that is, replacing the winding drum after a certain number of edges have been wound, a good winding effect can be achieved.

[0014] In a preferred embodiment, this application can be further configured such that, during the clamping step, a clamping member is used to clamp the cut-off edge, and there is friction between the clamping member and the cut-off edge.

[0015] By adopting the above technical solution, there is friction between the clamping component and the edge, which reduces the probability of the edge falling off the clamping component when the edge is rolled up.

[0016] In a preferred embodiment, this application can be further configured such that, during the clamping step, the clamping force of the clamping member on the edge increases with the number of times the rewind shaft is activated during the collecting step.

[0017] By adopting the above technical solution, when the number of times the winding shaft is started increases during use, it indicates that the winding edge increases, the winding diameter increases, and the length of the edge wound in one revolution of the winding shaft increases. Therefore, the clamping force is increased, which can improve the tension and thus strengthen the winding tension.

[0018] In a preferred embodiment, this application may be further configured such that the biodegradable hot melt adhesive is a PLA-based hot melt adhesive.

[0019] In a preferred embodiment, the present application may be further configured such that the components of the biodegradable hot melt adhesive are: 70-85 parts by weight of PLA resin, 8-15 parts by weight of nanofiller, and 5-10 parts by weight of tackifying resin. Detailed Implementation

[0020] This application discloses a method for preparing a nano-mesoporous hot melt adhesive ultrathin zero-carbon composite film, comprising the following steps: Composite Steps: A composite film is obtained by combining a biodegradable hot melt adhesive (such as PLA-based, PCL-based, or PBS-based adhesive) with a biodegradable top layer (biodegradable nonwoven fabric) and a biodegradable bottom layer (biodegradable nonwoven fabric). The width of the hot melt adhesive is smaller than the width of the biodegradable top layer, and the width of the biodegradable top layer is equal to the width of the biodegradable bottom layer. After passing through a slot coater, the biodegradable hot melt adhesive is coated on the bottom layer, and the top layer covers the bottom layer to obtain the composite film. The biodegradable hot melt adhesive after lamination has a microporous structure. Cutting steps: Trim the edges of the composite film; In the clamping step, the cut edge is clamped by a clamping component (such as a clamping roller). When the cut edge reaches a preset value (such as ten unit lengths), the collection step begins. The clamping component clamps the cut edge, and there is friction between the clamping component and the cut edge. The clamping force (friction) increases with the number of times the winding shaft is started in the collection step. The collection step is used to collect the cut edges and detect the remaining amount of the cut edges that have not been rolled up. If it is less than a preset value (such as one unit length), the rolling process is stopped. The replacement step is used to replace the take-up drum that has been wound with a certain amount of length (e.g., 50 units) on it.

[0021] In one embodiment, the biodegradable hot melt adhesive may be a PLA-based hot melt adhesive, and its components include the following: 70-85 parts by weight of PLA resin, 8-15 parts by weight of nanofillers (such as nanocellulose, carbon nanotubes or nanosilica, etc.), and 5-10 parts by weight of tackifying resin (such as rosin ester, terpene resin, etc.). The method for preparing the hot melt adhesive is the same as the existing method, so it will not be described.

[0022] The implementation principle of this embodiment is as follows: in use, a biodegradable composite film is obtained by combining biodegradable hot melt adhesive with biodegradable top and bottom layers, thereby achieving the goal of environmental protection and zero carbon emissions.

[0023] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for preparing a nano-mesoporous microporous hot melt adhesive ultra-thin zero-carbon composite film, characterized in that: The method comprises the following steps: a compounding step of compounding the degradable hot melt adhesive and the degradable surface layer and the degradable bottom layer to obtain a composite film, wherein the width of the hot melt adhesive is smaller than the width of the degradable surface layer, and the width of the degradable surface layer is equal to the width of the degradable bottom layer; A cutting step of cutting the edges of the composite film.

2. The preparation method of the nanometer mesoporous microporous hot melt adhesive ultra-thin zero-carbon composite film according to claim 1, characterized in that: In the compounding step, the degradable hot melt adhesive is coated on the degradable bottom layer through a slot coater, the degradable surface layer covers the degradable bottom layer to obtain the composite film, and the degradable hot melt adhesive after pressing has a microporous structure.

3. The preparation method of the nanometer mesoporous microporous hot melt adhesive ultra-thin zero-carbon composite film according to claim 1, characterized in that: The method further comprises a collecting step of collecting the cut edges, and further comprises a clamping step before the collecting step, wherein the clamping step is used for clamping the cut edges, and the collecting step is used for collecting the edges by using a winding roller when the cut edges reach a preset value.

4. The preparation method of the nanometer mesoporous microporous hot melt adhesive ultra-thin zero-carbon composite film according to claim 3, characterized in that: In the collecting step, the remaining amount of the cut edges is detected, and if the remaining amount is less than the preset value, the winding is stopped.

5. The preparation method of the nanometer mesoporous microporous hot melt adhesive ultra-thin zero-carbon composite film according to claim 4, characterized in that: The method further comprises a replacing step of replacing the winding shaft after a certain amount of winding tube is wound on the winding shaft.

6. The preparation method of the nanometer mesoporous microporous hot melt adhesive ultra-thin zero-carbon composite film according to claim 3, characterized in that: In the clamping step, the clamping member is used to clamp the cut edges, and a friction force exists between the clamping member and the cut edges.

7. The preparation method of the nanometer mesoporous microporous hot melt adhesive ultra-thin zero-carbon composite film according to claim 6, characterized in that: In the clamping step, the clamping force of the clamping member on the edges increases with the increase of the number of times of starting the winding shaft in the collecting step.

8. The method for preparing a nano-mesoporous microporous hot-melt adhesive ultra-thin zero-carbon composite film according to claim 1, characterized in that: The degradable hot melt adhesive is a PLA-based hot melt adhesive.

9. The preparation method of the nanometer mesoporous microporous hot melt adhesive ultra-thin zero-carbon composite film according to claim 8, characterized in that: The components of the degradable hot melt adhesive are: 70-85 parts by weight of PLA resin, 8-15 parts by weight of nano filler, and 5-10 parts by weight of tackifying resin.