Matte fabric and its production process

Abstract

The present application relates to the technical field of laminated fabric, and discloses a matte cloth and a production process thereof, and specifically comprises the following steps: S1, preparing a matte hot melt film, wherein the matte hot melt film comprises a TPU hot melt film layer and a matte surface treatment layer on the surface of the TPU hot melt film layer; S2, unwinding a mesh fabric, a mesh lining and the matte hot melt film prepared in step S1, so that the matte hot melt film is located between the mesh fabric and the mesh lining, and then hot-pressing to obtain the matte cloth, wherein the matte surface treatment layer is attached to the mesh fabric. The layer structure of the matte hot melt film comprises the TPU hot melt film layer and the matte surface treatment layer. Compared with the conventional matte hot melt film prepared by blending and melting the matte agent and TPU master batch, the matte agent is first dispersed in the water-based PU emulsion and the dispersing capacity is increased by using a titanate coupling agent, so that the mixture is more uniform and sufficient. Second, the matte agent is concentrated and arranged in an orderly manner on the surface of the matte hot melt film, so that a good matte effect is achieved, and the effect of not becoming bright after hot-pressing is achieved.

Description

Technical Field

[0001] This invention relates to the field of laminated fabric technology, specifically to a matte fabric and its manufacturing process. Background Technology

[0002] Matte fabric refers to a finished product made by laminating a mesh fabric and a woven fabric together using a hot melt film as an adhesive layer. The hot melt film has a matte finish, and its matte appearance is visible through the mesh fabric. Current methods for producing matte hot melt films typically involve first blending a matting agent, such as silica, with TPU resin to create a TPU matte masterbatch. This masterbatch is then mixed with the hot melt film TPU masterbatch and cast onto release paper using a casting process. Finally, it is pressed with a matte roller to form the matte hot melt film. After heating and lamination, the surface state of the TPU hot melt film, which originally had a certain degree of haze, changes. The haze decreases, and it becomes glossy. The exposed TPU film within the knitted mesh significantly affects the appearance quality of the composite material, failing to achieve a satisfactory matte finish. Summary of the Invention

[0003] The purpose of this invention is to provide a matte fabric and its production process, which has a good matte finish and achieves the effect of not becoming shiny after hot pressing.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0005] The production process for matte fabric includes the following steps:

[0006] S1. Prepare a matte hot melt film, which includes a TPU hot melt film layer and a matte surface treatment layer on the surface of the TPU hot melt film layer.

[0007] S2. Unwind the mesh fabric, the mesh inner fabric, and the matte hot melt film from step S1, so that the matte hot melt film is located between the mesh fabric and the mesh inner fabric, and hot press to form a matte fabric, with the matte surface treatment layer bonded to the mesh fabric.

[0008] Preferably, the method for preparing the matte hot melt film in step S1 specifically includes the following steps:

[0009] S111 and TPU masterbatch are melted in an extruder and cast onto release paper, then cooled to obtain a TPU hot melt dry film with release paper attached.

[0010] S112. Apply the prepared matte surface treatment coating to the surface of the TPU hot melt dry film from step S111. The hot melting point of the matte surface treatment coating is 120℃~130℃, and the coating amount is 10g / m². 2 ~15g / m 2 ;

[0011] S113. After drying, the film is rolled up for later use. The matte hot melt film consists of release paper, TPU hot melt film layer and matte surface treatment layer. The release paper is peeled off before hot pressing.

[0012] Preferably, the method for preparing the matte hot melt film in step S1 specifically includes the following steps:

[0013] S121, TPU masterbatch is melted in an extruder to become a melt, and then the melt-blown method is used to obtain a web on a web forming machine. After hot air drying, solidification and bonding, and winding, TPU hot melt web film is obtained.

[0014] S122. Apply the prepared matte surface treatment coating to the release paper. The hot melting point of the matte surface treatment coating is 120℃~130℃, and the coating amount is 10g / m². 2 ~15g / m 2 After pre-drying to semi-dry, the TPU hot melt film from step S121 is bonded to the matte surface treatment coating, then dried and rolled up for later use. The matte hot melt film consists of release paper, matte surface treatment layer and TPU hot melt film layer. The release paper is peeled off before hot pressing.

[0015] Preferably, the matte surface treatment coating comprises 90-100 parts of water-based PU emulsion, 8-12 parts of TPU matting agent, 2-4 parts of rheology modifier, and 1%-2% of titanate coupling agent.

[0016] Preferably, the matting agent is amorphous silica or silica-containing matting powder.

[0017] Preferably, the aqueous PU emulsion is prepared from reactive aqueous PU and water, with a solid content of 25% to 40%. The reactive aqueous PU undergoes two chain extension reactions using MDEA and DMPA as chain extenders and prepolymers, and a terminal isocyanate capping reaction using isopropanol and sodium sulfite solution as capping agents.

[0018] Preferably, the drying temperature of the matte surface treatment coating is 100℃~110℃, and the thickness of the matte surface treatment layer after drying is 20μm-25μm.

[0019] Preferably, the thickness of the TPU hot melt film layer is 0.5mm-2.5mm.

[0020] Preferably, the hot pressing process conditions in step S2 are: hot pressing temperature 135℃~145℃, hot pressing pressure 1kg / cm². 2 ~2kg / cm 2 The hot pressing time is 5-15 seconds.

[0021] The present invention also provides a matte fabric, which is produced using the above-described matte fabric production process.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The matte hot melt film of this invention comprises a TPU hot melt film layer and a matte surface treatment layer. Compared with the conventional method of blending and melting the matting agent with TPU masterbatch, the matting agent of this invention is firstly dispersed in an aqueous PU emulsion and the dispersion ability is increased by using a titanate coupling agent, resulting in more uniform and thorough mixing. Secondly, it is concentrated and orderly arranged on the surface of the matte hot melt film, which has a good matte effect and achieves the effect of not being shiny after hot pressing.

[0024] In the drying process of the matte surface treatment layer preparation, this invention employs a drying process with a temperature lower than the melting point of the matte surface treatment layer and the melting point of the TPU hot melt film layer. This allows the moisture in the matte surface treatment layer to evaporate and the water-based PU in the matte surface treatment layer to solidify on the hot melt film layer. At the same time, it retains the end-capping properties of the water-based PU so that it can undergo pyrolysis during hot pressing at 135℃~145℃, covalently bonding with the hydroxyl groups on the fibers of the mesh fabric and reacting to form a cross-linked film, thereby enhancing the bonding strength between the mesh fabric and the mesh backing fabric.

[0025] In addition, the reactive waterborne PU prepared by end-capping with isopropanol and sodium sulfite solution in this invention will also generate carbon dioxide during the cracking reaction at hot pressing temperature, which is beneficial to forming breathable and waterproof micropores in the matte surface treatment layer. When the TPU hot melt film layer adopts TPU hot melt mesh, a matte fabric with good breathability and good matte effect can be obtained as a whole. Detailed Implementation

[0026] Example 1

[0027] This embodiment provides a matte fabric production process, which specifically includes the following steps:

[0028] S1. Preparation of matte hot melt film: TPU masterbatch is melted and cast onto release paper in an extruder. The release paper is glassine paper. The TPU masterbatch selected is Bangtai Polymer 6185B with a melting point of 115℃~125℃. After cooling, a TPU hot melt dry film with release paper is obtained. A prepared matte surface treatment coating is applied to the surface of the TPU hot melt dry film using a gravure roller, with a coating amount of 15g / m². 2 After drying at 108℃, the film is rolled up for later use. The matte hot melt film consists of release paper, a TPU hot melt film layer and a matte surface treatment layer. The thickness of the matte surface treatment layer after drying is 24.5μm, and the thickness of the TPU hot melt film layer is 2mm.

[0029] S2. Unwind the mesh knitted outer fabric, mesh knitted lining fabric, and the matte hot melt film from step S1, so that the matte hot melt film after peeling off the release paper is located between the mesh knitted outer fabric and the mesh knitted lining fabric. Hot press to form a matte fabric, with the matte surface treatment layer bonded to the mesh knitted outer fabric. The hot pressing conditions are: hot pressing temperature 140℃, hot pressing pressure 1.5 kg / cm². 2 The hot pressing time is 10 seconds.

[0030] The matte surface treatment coating of this embodiment has a hot melting point of 120℃~130℃. The matte surface treatment coating includes 95 parts of water-based PU emulsion, 10 parts of TPU matting agent, 2 parts of rheology modifier and 1% titanate coupling agent. The matting agent is amorphous silica. The water-based PU emulsion is prepared by reactive water-based PU and water, with a solid content of 30%. The synthesis process of the reactive water-based PU is as follows: PPG, PEG and polyester polyol JW218 are dried and mixed, and then reacted with IPDI under the action of a catalyst. Then, chain extender MDEA is added and a chain extension reaction is carried out at 55℃. Then, chain extender DMPA is added and a second chain extension reaction is carried out at 65℃. Then, the viscosity is reduced, cooled to 40℃ and triethylamine is added for neutralization. Finally, isopropanol and sodium sulfite solution (volume ratio of 3:2) are added as end-capping agents to carry out terminal isocyanate end-capping reaction.

[0031] Example 2

[0032] This embodiment provides a matte fabric production process, which specifically includes the following steps:

[0033] S1. Preparation of matte hot melt film: TPU masterbatch is melted in an extruder to form a molten body, then melt-blown onto a web forming machine to obtain a fiber web. This web is then dried with hot air, solidified, and wound to obtain a TPU hot melt web film. The TPU masterbatch selected is Bangtai Polymer 6185B, with a melting point of 115℃~125℃. S122. Coating the prepared matte surface treatment coating onto release paper. The release paper is glassine paper, and the hot melting point of the matte surface treatment coating is 120℃~130℃. The coating amount is 12g / m². 2 The TPU hot melt film is pre-dried at 108℃ until semi-dry, then laminated onto the matte surface treatment coating. After drying at 108℃, it is rolled up for later use. The matte hot melt film consists of release paper, matte surface treatment layer and TPU hot melt film layer. The release paper is peeled off before hot pressing. After drying, the thickness of the matte surface treatment layer is 21.5μm and the thickness of the TPU hot melt film layer is 2mm.

[0034] S2. Unwind the mesh knitted outer fabric, mesh knitted lining fabric, and the matte hot melt film from step S1, so that the matte hot melt film after peeling off the release paper is located between the mesh knitted outer fabric and the mesh knitted lining fabric. Hot press to form a matte fabric, with the matte surface treatment layer bonded to the mesh knitted outer fabric. The hot pressing conditions are: hot pressing temperature 140℃, hot pressing pressure 1.5 kg / cm².2 The hot pressing time is 15 seconds.

[0035] The matte surface treatment coating of this embodiment has a hot melting point of 120℃~130℃. The matte surface treatment coating includes 100 parts of water-based PU emulsion, 12 parts of TPU matting agent, 3 parts of rheology modifier, and 2% titanate coupling agent. The matting agent is a silicone matting powder. The water-based PU emulsion is prepared by reactive water-based PU and water, with a solid content of 30%. The synthesis process of the reactive water-based PU is as follows: PPG, PEG and polyester polyol JW218 are dried and mixed, and then reacted with IPDI under the action of a catalyst. Then, chain extender MDEA is added and a chain extension reaction is carried out at 55℃. Then, chain extender DMPA is added and a second chain extension reaction is carried out at 65℃. Then, the viscosity is reduced, the temperature is cooled to 40℃ and triethylamine is added for neutralization. Finally, isopropanol and sodium sulfite solution (volume ratio of 3:2) are added as end-capping agents to carry out terminal isocyanate end-capping reaction.

[0036] The foregoing has shown and described the basic principles, main features and advantages of this invention. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of this invention. Various changes and modifications can be made to this invention without departing from the spirit and scope of this invention. All such changes and modifications fall within the scope of this invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A process for producing a matte cloth, characterized by, Specifically comprising the following steps: S1, preparing a matte hot melt film, the matte hot melt film comprising a TPU hot melt film layer and a matte surface treatment layer on the surface of the TPU hot melt film layer, the matte surface treatment layer being formed after the matte surface treatment coating is dried, the matte surface treatment coating comprising 90-100 parts of water-based PU emulsion, 8-12 parts of TPU matte agent, 2-4 parts of rheological auxiliary agent, and 1%-2% of titanate coupling agent; S2, unwinding the mesh face cloth, the mesh lining cloth, and the matte hot melt film of step S1, so that the matte hot melt film is located between the mesh face cloth and the mesh lining cloth, and hot-pressing to form a matte cloth, the matte surface treatment layer being attached to the mesh face cloth; The preparation method of the matte hot melt film of step S1 specifically comprises the following steps: S121, after the TPU master batch is melted into a melt in the extruder, a fiber web is obtained on a web former by melt-blowing, and then hot air drying, solidification and bonding are performed to obtain a TPU hot melt web film; S122, the prepared matte surface treatment paint is coated on the release paper, the hot melting point of the matte surface treatment paint is 120-130 ℃, and the coating amount is 10-15 g / m 2 . 2 After pre-baking to semi-dry, the TPU hot melting film of step S121 is attached on the matte surface treatment paint, and then dried and wound for standby use. The matte hot melting film is composed of the release paper, the matte surface treatment layer and the TPU hot melting film layer. The TPU hot melting film is the TPU hot melting film layer, and the release paper is peeled off before hot pressing.

2. The process for producing a matte cloth according to claim 1, characterized in that: The TPU matte agent is a silicon-containing matt powder.

3. The process for producing a matte cloth according to claim 1, characterized in that: The water-based PU emulsion is configured by a reactive water-based PU and water, and has a solid content of 25%-40%, the reactive water-based PU being subjected to twice chain extension reaction by using MDEA and DMPA as chain extenders and a prepolymer, and end isocyanate end-capping reaction by using isopropyl alcohol and sodium sulfite solution as end-capping agents.

4. The process for producing a matte cloth according to claim 1, wherein: The drying temperature of the matte surface treatment coating is 100-110°C, and the thickness of the matte surface treatment layer after drying is 20-25μm.

5. The process for producing a matte cloth according to claim 1, wherein: The thickness of the TPU hot melt film layer is 0.5-2.5mm.

6. The process for producing a matte cloth according to claim 1, wherein: The hot-pressing process condition of the step S2 is: hot-pressing temperature 135℃-145℃, hot-pressing pressure 1kg / cm 2 ~2kg / cm 2 hot-pressing time 5 seconds-15 seconds.

7. A matte cloth characterized by: The matte cloth is produced by using the production process according to any one of claims 1-6.