Spreading production process of thermoplastic polyurethane and polyester fiber composite coiled material

Abstract

The invention relates to a pattern scattering production process of a thermoplastic polyurethane and polyester fiber composite coiled material, which comprises the following steps: (1) impregnating polyester fibers, and drying to obtain a micro-foaming base material A; (2) coating a layer of adhesive on the micro-foaming base material A, pre-laminating a TPU pure-color wear-resistant layer produced by a casting machine after drying, scattering irregular flaky thermoplastic polyurethane flaky particles with different colors on the surface of the wear-resistant layer, and embedding the colored particles into the wear-resistant layer through high-temperature softening to prepare a base material B; (3) the base material B is subjected to high-temperature embossing treatment on the surface of the product through an embossing roller, customized textures are formed, and then UV film spraying treatment is conducted to prepare a base material C; and (4) hot-pressing textures at the bottom of the base material C, shaping, controlling the initial warping of the product, enabling the product to be in full contact with the ground during installation, cooling, cutting edges, and rolling to obtain the finished coiled material floor. The invention belongs to a flooring decorative material, and has the advantages of favorable wear resistance, favorable cold resistance, favorable oil resistance, high flame retardancy, high impact resistance and light weight.

Description

Technical Field

[0001] The invention relates to a production process of a composite coil, in particular to a scattering production process of a thermoplastic polyurethane and polyester fiber composite coil, belonging to the technical field of production processes of floor decoration materials. Background Art

[0002] Recently, with the progress of composite materials and the improvement of processing technology, various elastic flooring materials have emerged. With their light weight, convenient laying, wear-resistant surface, thin thickness and elasticity, they have replaced part of the previous ceramic tiles and marbles and are widely used in public and temporary occasions. Among them, thermoplastic elastomers (hereinafter referred to as TPU) are more widely sought after. TPU belongs to a class of elastic polymer materials containing more carbamate groups (-NHCOO-) in the molecular chain. With the development of TPU materials and the reduction of costs, as well as the gradual manifestation of its excellent performance, how to use thermoplastic polyurethane materials to process elastic flooring materials has become the object of research for technicians in this field.

[0003] The production process of TPU in the prior art is mainly: mixing - calendering - surface treatment - cutting and packaging. The TPU coils obtained therefrom have the following technical problems:

[0004] 1. The lamination problem between TPU and other heterogeneous materials such as polyester fiber is very prominent;

[0005] 2. How to improve the bonding strength between polyester fibers and improve the folding resistance and resilience of composite coils.

[0006] Therefore, it is an urgent problem for technicians in this field to develop a production process for an environmentally friendly, non-toxic thermoplastic polyurethane and polyester fiber composite coil that is lighter, more fold-resistant, more wear-resistant, highly elastic, and easily recoverable. Summary of the invention

[0007] In view of the above-mentioned technical problems of the prior art, the purpose of the present invention is to provide a production process for scattering flowers of thermoplastic polyurethane and polyester fiber composite coils, so as to optimize the production process, reduce production costs and improve product market competitiveness.

[0008] To achieve the above object, the present invention is achieved through the following technical solutions:

[0009] A process for producing a composite coil of thermoplastic polyurethane and polyester fiber, comprising the following steps:

[0010] (1) impregnating with 500 g / sqm-5000 g / sqm polyester fiber, the impregnation amount being 3-10 times that of the polyester fiber, and then drying at 150° C.-200° C. to obtain a micro-foamed substrate A;

[0011] (2) coating a layer of adhesive on the micro-foam substrate A of step (1), drying and pre-laminating the TPU solid color wear-resistant layer produced by a casting machine, and then sprinkling irregular flakes of thermoplastic polyurethane flake particles of different colors on the wear-resistant layer, and then embedding the colored particles into the wear-resistant layer after high temperature softening, to obtain substrate B;

[0012] (3) subjecting the substrate B obtained in step (2) to high-temperature embossing treatment on the surface of the product by an embossing roller to form a customized texture, and then subjecting the substrate to UV coating treatment to obtain substrate C;

[0013] (4) The bottom of the substrate C obtained in step (3) is hot pressed to texture and shape the product, and the initial warping is controlled so that it can be more fully in contact with the ground during installation. After cooling, the edges are trimmed and rolled up to obtain the finished coil floor.

[0014] The impregnation mixed liquid in the step (1) is a mixed liquid of acrylic water-based resin, modified magnesium hydroxide, flame retardant, mildew and antibacterial agent and water.

[0015] The impregnation mixed solution in step (1) is 100 parts of acrylic acid aqueous resin, 50-200 parts of modified magnesium hydroxide, 1-5 parts of flame retardant, 1-5 parts of mildew and antibacterial agent and 100-500 parts of water.

[0016] The water-based resin is an acrylic water-based resin.

[0017] The flame retardant is a zinc phosphate composite material.

[0018] The mildew and antibacterial agent is nano zinc.

[0019] The adhesive in step (2) is PUR hot melt adhesive or hot melt adhesive.

[0020] The flower scattering production process of the thermoplastic polyurethane and polyester fiber composite coil of the present invention has the following beneficial effects:

[0021] 1. The present invention adopts water-based environmentally friendly resin production, which is pollution-free;

[0022] 2. The present invention uses polyester fiber materials and water-based resins to be impregnated and then dried at high temperature to produce physical micro-foaming, making the base material lighter per unit volume, and increasing the bonding force between polyester fibers, thereby enhancing the folding resistance and resilience of the composite coil base;

[0023] 3. The present invention impregnates the polyester fiber material with water-based resin, and then dries and rolls on a highly transparent traceless PUR adhesive process, which further solves the problem of bonding between thermoplastic polyurethane and polyester fiber and other different materials. The weight of the floor is only one-third of that of conventional flooring, which further improves the folding resistance.

[0024] 4. The present invention forms a thermoplastic polyurethane layer with a thickness of 0.10-0.50 mm on the polyester fiber through powdering and melt pressing processes, and then forms a coiled material imitating the homogeneous through-core process through flower sprinkling and hot embedding processes;

[0025] 5. The surface wear-resistant layer of the present invention is thermoplastic polyurethane, which is more wear-resistant and low-cost. The wear resistance of the TPU wear-resistant layer of the same thickness is 5 times higher than that of the PVC wear-resistant layer, but its cost is only 1 times that of the PVC wear-resistant layer. It has a higher cost-effectiveness and is worthy of promotion and application. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0027] Example 1

[0028] In this embodiment 1, a thermoplastic polyurethane composite material with color particles on the surface is prepared, and the preparation steps are as follows:

[0029] (1) 100 parts of acrylic resin, 10-50 parts of modified magnesium hydroxide, 1-5 parts of organic mildew and antibacterial agent, 100-500 parts of water, 1-5 parts of flame retardant, etc. are sent to a stirring barrel through an automatic metering system, maintained at room temperature of 22-28°C, and stirred at a low speed of 50-100RPM for 10 minutes, so that the materials in the stirring barrel are evenly mixed to obtain a water-based flame retardant resin paste modified by a halogen-free flame retardant. Then, the polyester fiber cloth is impregnated in the water-based flame retardant resin paste through an unwinding process, and the impregnation amount is 1-5 kg / m2. The impregnated polyester fiber cloth is dried and cured in a 100-200°C oven to obtain a flame-retardant polyester fiber substrate.

[0030] (2) 100 parts of thermoplastic polyurethane pellets, 10-50 parts of modified magnesium hydroxide, 1-10 parts of benzotriazole compounds, 10-20 parts of zinc stearate, 1-20 parts of silicone oil, 1-20 parts of calcium silicate, etc. are sent to a mixing barrel through an automatic metering system, melt-stirred, extruded, granulated, cooled, and ground at a high temperature of 200-250°C to form a 20-30 mesh powder, and then the ground powdered resin is evenly spread on the polyester fiber substrate through a powdering process, and the powdering amount is controlled by the powdering speed. The spread thermoplastic polyurethane powder is fused on the polyester fiber substrate through a high temperature oven at 200-250°C, and then a thermoplastic polyurethane wear-resistant rubber surface is formed by roller pressing, and the thickness of the wear-resistant rubber surface is 0.10-0.50mm.

[0031] (3) When the thermoplastic polyurethane wear-resistant rubber surface has not yet completely cooled and solidified, the thermoplastic polyurethane color particles are evenly spread on the thermoplastic polyurethane wear-resistant rubber surface. Then, the amorphous thermoplastic polyurethane colorful particles are embedded in the surface layer of the thermoplastic polyurethane through a cold pressing process, and then the surface is embossed. The preparation method of thermoplastic polyurethane colorful particles is as follows: 100 parts of thermoplastic polyurethane pellets, 10-50 parts of modified magnesium hydroxide, and 10 parts of 3-5 kinds of masterbatches are taken, and the mixture is mixed by automatic metering, and colorful sheets are casted, and then processed into colorful particles of small particles of different shapes and sizes through a crusher and a vibrating screen.

[0032] (4) Use hot pressing process to carry out surface embossing treatment. Then, through UV coating process, apply about 10-30g of water-based iodine-resistant UV coating on the surface per square meter, and cure it through ultraviolet lamp to form a surface protection film with functions such as scratch resistance, wear resistance, iodine resistance, oil resistance, and smoke resistance. Finally, after the product is cooled and shaped, the bottom back pressure process is used to extrude the bottom pattern with a depth of 0.10-0.30mm, and then the edge is cut to 2m width and rolled up.

[0033] Example 2

[0034] The main difference between Example 2 and Example 1 is that the ingredients of the water-based flame retardant resin paste are different. Specifically, the thermoplastic polyurethane colorful particles spread in step (3) are replaced with an equal amount of corundum.

[0035] Example 3

[0036] The main difference between Example 3 and Example 1 is that a polyester fiber cloth (lower woven weight) with a sparser weave and more pores is used as the composite material substrate, and the impregnation amount of the water-based flame retardant resin paste in step (1) is about 5.0-10.0 kg / square meter.

[0037] Comparative Example 1

[0038] Purchase commercially available PVC composite coils, the thickness of the PVC wear-resistant layer is 0.30mm.

[0039] Comparative Example 2

[0040] The main difference between Comparative Example 2 and Example 1 is that the unwound polyester fiber cloth is not impregnated with the water-based flame retardant resin paste, and a certain thickness of flame retardant thermoplastic polyurethane powder is directly sprinkled thereon, and then the thermoplastic polyurethane composite material is produced according to the conditions and steps of Example 1.

[0041] Performance Testing

[0042] The key indicators of the composite coils of Examples 1-3 and Comparative Examples 1-2 were tested.

[0043] The test methods for the above performances are as follows:

[0044] (1) Wear resistance grade: EN 13329 standard, sample a 100 mm diameter circle, pass the Table wear test machine, use S-42 grinding wheel and No. 0 grinding belt.

[0045] (2) Peel strength: ISO 24345 standard, sample size 50*150mm, tested by microelectronic servo tensile machine at room temperature.

[0046] (3) Thermal shrinkage rate: ISO 23999 standard, sample size 240*240 mm, test size 1 at room temperature, then put it in an oven at 80℃ / 6 hours, restore it to size 2 at room temperature, and compare the change rates of size 1 and size 2.

[0047] (4) High temperature warpage: ISO 23999 standard, sample size 240*240 mm, after being dried in an oven at 80℃ for 6 hours, return to room temperature, and the maximum warpage of the four corners of the sample.

[0048] (5) Bendability: ISO24344 standard, sample size 50*250mm, under a certain ambient temperature, wrap around a cylinder of a predetermined diameter to determine whether the sample is cracked or broken.

[0049] (6) Friction coefficient: EN 13893 standard, sample size 500*1000mm, use dynamic friction coefficient tester to test the corresponding friction coefficient.

[0050] It can be seen from the above performance comparison results that the composite material using thermoplastic polyurethane as the surface adhesive has significantly better bending performance (normal temperature and low temperature) than the commercially available PVC composite coil (Comparative Example 1). Comparing Examples 1-3 with Comparative Example 2, it can be seen that the thermoplastic polyurethane composite material obtained by pre-impregnating the polyester fiber cloth with a water-based flame retardant resin paste has better anti-peeling performance, the product is more durable, and the heat shrinkage rate and high-temperature warping degree are relatively low. In this way, it is not easy to have problems such as delamination and bulging due to chemical erosion and thermal expansion and contraction during use. In terms of wear resistance, the thermoplastic polyurethane composite material prepared by the present invention has a better wear resistance grade than the PVC composite coil with a wear-resistant layer thickness of 0.30mm when the thermoplastic polyurethane adhesive surface thickness is 0.2mm, and the PVC composite coil must reach the same AC5 grade of wear resistance if the PVC wear-resistant layer thickness reaches 0.55mm or more. It can be seen that the present invention can produce a commercial composite coil with a smaller thickness and lighter weight.

[0051] The thermoplastic polyurethane and polyester fiber composite coil prepared by the present invention, referred to as thermoplastic polyurethane composite coil, belongs to floor decoration materials, has good wear resistance, cold resistance, oil resistance, high flame retardancy, strong impact resistance, and lightweight, and is widely used in floor decoration, such as schools, laboratories, hospitals, shopping malls, hotels, restaurants, gymnasiums, rails, warehouses, light industrial workshops, rail transit and other commercial fields.

[0052] The above embodiments are only used to explain the inventive concept of the present invention, rather than to limit the protection of the rights of the present invention. Any non-substantial changes to the present invention using this concept shall fall within the protection scope of the present invention.

Claims

1. A process for producing a composite coil of thermoplastic polyurethane and polyester fiber, characterized in that The following steps are involved: (1) impregnating with 500g / sqm-5000g / sqm polyester fiber, the impregnation amount is 3-10 times that of the polyester fiber, and then drying at 150℃-200℃ to obtain a micro-foam substrate A; (2) coating a layer of adhesive on the micro-foam substrate A of step (1), pre-laminating the TPU solid color wear-resistant layer produced by the casting machine after drying, and then sprinkling irregular flakes of thermoplastic polyurethane flake particles of different colors on the wear-resistant layer, and then embedding the colored particles into the wear-resistant layer after high temperature softening to obtain substrate B; (3) The substrate B prepared in step (2) is subjected to high-temperature embossing treatment on the surface of the product by an embossing roller to form a customized texture, and then subjected to UV coating treatment to obtain substrate C; (4) The bottom of the substrate C obtained in step (3) is subjected to hot pressing to form a texture and shape, and the initial warping of the product is controlled so that it can be more fully in contact with the ground during installation. After cooling, the substrate C is trimmed and rolled up to obtain a finished coil floor.

2. The inkjet printing production process of thermoplastic polyurethane and polyester fiber composite coil as claimed in claim 1, characterized in that: The impregnation mixed liquid in the step (1) is a mixed liquid of acrylic water-based resin, modified magnesium hydroxide, flame retardant, mildew and antibacterial agent and water.

3. The inkjet printing production process of thermoplastic polyurethane and polyester fiber composite coil as claimed in claim 2, characterized in that: The impregnation mixed liquid in step (1) is 100 parts of the acrylic acid aqueous resin, 50-200 parts of modified magnesium hydroxide, 1-5 parts of flame retardant, 1-5 parts of mildew and antibacterial agent and 100-500 parts of water.

4. The inkjet printing production process of thermoplastic polyurethane and polyester fiber composite coil according to claim 2 or 3, characterized in that: The water-based resin is an acrylic water-based resin.

5. The inkjet printing production process of thermoplastic polyurethane and polyester fiber composite coil as claimed in claim 2 or 3, characterized in that: The flame retardant is a zinc phosphate composite material.

6. The inkjet printing production process of thermoplastic polyurethane and polyester fiber composite coil according to claim 2 or 3, characterized in that: The mildew and antibacterial agent is nano zinc.

7. The process for producing a composite coil of thermoplastic polyurethane and polyester fiber as claimed in claim 1, characterized in that: The adhesive in step (2) is PUR hot melt adhesive or hot melt adhesive.