Flame retardant geotextile material, process of preparation and geotextile membrane article

Abstract

The present application relates to a kind of flame-retardant geotechnical material, preparation process and geotechnical membrane product.The flame-retardant geotechnical material is the multilayer composite material comprising cloth layer material and film layer material, cloth layer material is arranged on the upper and lower sides of film layer material, the cloth layer material on the upper and lower sides is spacedly impregnated with flame-retardant material, forms discontinuous high flame-retardant area, each high flame-retardant area includes the impregnated area in the middle and the impregnated area on both sides, and, the impregnated area on the upper and lower sides of film layer material does not overlap, and the impregnated area on each side is spaced film layer material corresponding to the other side of the opposite side is the non-impregnated area of cloth layer material. By making continuous conveying cloth layer raw material intermittent immersion in flame-retardant material according to set frequency, obtain the cloth layer raw material spacedly impregnated with flame-retardant material, the cloth layer raw material spacedly impregnated with flame-retardant material is dried to obtain the cloth layer material with discontinuous high flame-retardant area, the prepared cloth layer material is compounded to the two sides of film layer material by online bonding process, obtain the flame-retardant geotechnical material.

Description

Technical Field

[0001] This invention relates to the field of flame-retardant geomaterials technology, specifically to a flame-retardant geomaterial, its preparation process, and geomembrane products. Background Technology

[0002] Geomembranes, as geosynthetic seepage prevention materials, are often combined with geotextiles. For example, a geomembrane with geotextiles attached to both sides is called "two-layer geotextile and one-layer geomembrane". The composite membrane of geotextile and geomembrane itself has certain basic flame retardant properties, but in situations with high flame retardant requirements, the material itself alone cannot meet the higher flame retardant technical requirements.

[0003] To address the issue of improving the flame retardancy of geotextiles, existing technologies include attaching flame retardant material layers to geomembranes and applying flame retardant coatings either integrally or between layers. However, for mature composite membranes of geotextiles and geomembranes, such as "two-layer geotextile and one-layer geomembrane," the above methods either involve complex manufacturing processes or cause significant changes in product thickness, weight, and even mechanical properties. This can lead to increased production costs or, in severe cases, substandard product performance. Summary of the Invention

[0004] To address the problems in the background art, this invention provides a flame-retardant geotextile material, a preparation process, and a geomembrane product. By rationally optimizing the flame-retardant impregnation scheme between the fabric-membrane composite geotextile layers, the overall flame-retardant performance of the material is improved while minimizing the impact on the product. At the same time, the manufacturing process is optimized, and the cost is reduced.

[0005] The objective of this invention is achieved through the following technical solutions.

[0006] In a first aspect, the present invention provides a flame-retardant geotextile material.

[0007] The flame-retardant geotextile is a multi-layer composite material comprising a fabric layer and a membrane layer. The fabric layer is disposed on the upper and lower sides of the membrane layer, and the fabric layer on both the upper and lower sides is impregnated with flame-retardant material at intervals to form discontinuous highly flame-retardant areas. Each highly flame-retardant area includes a central impregnated area and impregnated areas on both sides. Furthermore, the impregnated areas on the upper and lower sides of the membrane layer do not overlap, and the opposite side of the impregnated area on each side, separated by the membrane layer, corresponds to an unimpregnated area of ​​the fabric layer.

[0008] Furthermore, in the above-mentioned flame-retardant geotextile, the fabric layers on both the upper and lower sides are tightly attached to the membrane layer.

[0009] Furthermore, in the aforementioned flame-retardant geotextile materials, the bonding method is pressure heat bonding.

[0010] Furthermore, in the aforementioned flame-retardant geosynthetic materials, the widths of the impregnation zones within a single fabric layer are equal.

[0011] Furthermore, in the aforementioned flame-retardant geosynthetic materials, the spacing between each impregnation zone in a single fabric layer is equal.

[0012] Furthermore, in the above-mentioned flame-retardant geosynthetic materials, the infiltration zones on the upper and lower sides of the membrane material overlap (0% < overlap rate ≤ 100%).

[0013] Furthermore, in the above-mentioned flame-retardant geosynthetic materials, the overlap rate is 15% ≤ 50%.

[0014] Furthermore, in the aforementioned flame-retardant geomaterials, other material layers are provided between the fabric layer and the membrane layer and / or on the outside of the fabric layer.

[0015] Secondly, the present invention provides a preparation process for the above-mentioned flame-retardant geosynthetic material.

[0016] The above preparation process includes:

[0017] Step 1: Preparation of Fabric Layer Material by Impregnation Method

[0018] The continuously conveyed fabric material is intermittently immersed in flame retardant material at a set frequency to obtain fabric material intermittently impregnated with flame retardant material. The fabric material intermittently impregnated with flame retardant material is dried to obtain the fabric material with discontinuous high flame retardant area.

[0019] Step 2: Multilayer Material Composite Process

[0020] The fabric layer material prepared in step one is laminated to both sides of the membrane layer material through an online bonding process to obtain the flame-retardant geotextile material.

[0021] Thirdly, the present invention provides a geomembrane product.

[0022] The geomembrane product is made of the flame-retardant geomaterials described above, or of the flame-retardant geomaterials prepared by the preparation process described above.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention employs flame-retardant performance enhancement technology suitable for high-efficiency production and rationally optimizes the flame-retardant material impregnation scheme between the fabric-membrane composite geomaterial layers. This results in discontinuous high flame-retardant areas formed by the fabric layers on both the upper and lower sides of the membrane material, and the composite membrane does not overlap. This not only improves the overall flame-retardant performance of the material but also preserves its compressibility and adhesion, with minimal impact on product thickness, weight, and mechanical properties.

[0025] The above-mentioned solution provided by the present invention has a simple and quick implementation process, low equipment requirements, and the dip-dipping process and the composite process can be easily connected for production. At the same time, it shortens the time of a single process and the time of the entire production process, improves efficiency and reduces costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the flame-retardant geotextile material of the present invention.

[0027] Figure 2 This is a schematic diagram illustrating the operational principle of preparing fabric layer materials using the impregnation method of this invention.

[0028] The components represented by the labels in the diagram are:

[0029] Flame-retardant geotextile 10, fabric layer 11, impregnation zone 111, infiltration zone 112, membrane layer 12;

[0030] Conveyor roller 20;

[0031] Flame retardant material trough 30;

[0032] Drive mechanism 40. Detailed Implementation

[0033] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings, the details of which are for illustrative purposes or to facilitate the description of the concept of the invention, and are not intended to limit the invention.

[0034] Example 1

[0035] Firstly, this embodiment provides a flame-retardant geotextile material 10.

[0036] Specifically, such as Figure 1 As shown, Figure 1 The flame-retardant geotextile 10 shown is a multilayer composite material consisting of two layers of fabric material 11 and one layer of membrane material 12. The fabric material 11 is disposed on the upper and lower sides of the membrane material 12 and is tightly attached to the membrane material 12. Preferably, the attachment method is pressure heat bonding.

[0037] As a first aspect of the improvement of the present invention, as can be seen from the figure, the upper and lower sides of the fabric material 11 are all impregnated with flame retardant material at intervals, forming discontinuous high flame retardant areas. Each high flame retardant area includes a middle impregnated area 111 and two sides of impregnated areas 112 (areas where the colloidal material of the impregnated area 111 extends to both sides). Furthermore, the impregnated areas 111 on the upper and lower sides of the film material 12 do not overlap, and the opposite side of the impregnated area 111 on each side, separated by the film material 12, corresponds to the unimpregnated area of ​​the fabric material 11.

[0038] The term "high flame-retardant area" as used in this invention is clearly a comparative concept, referring to areas impregnated with flame-retardant materials whose flame-retardant performance is enhanced, thus exceeding that of the geotextile 10 itself. The geotextile 10 can be made of synthetic fibers containing polyester, acrylic, nylon, etc., and the impregnated flame-retardant material, as long as it meets the requirements for improving flame-retardant performance, conforms to the spirit of this invention.

[0039] For example, in this embodiment, a silica flame-retardant colloid is used to impregnate the geomaterial 10, and the silica in the colloid is preferably nano-sized.

[0040] In this embodiment, the width and spacing of each impregnation zone 111 in a layered material 11 are equal. In order to make the junction area have a certain flame retardancy, it is preferable that the impregnation zones 112 on the upper and lower sides of the membrane material 12 overlap to a certain extent. Generally, as long as "0% < overlap rate ≤ 100%" is met, it can be considered as overlap. However, preferably, in the flame retardant geomaterial of this embodiment, the overlap rate of the impregnation zones 112 on the upper and lower sides of the membrane material 12 is selected between 15% and 50%. Such an overlap rate is sufficient to ensure that the entire material has sufficient flame retardant performance. Even if the flame retardancy at the junction of the upper and lower impregnation zones 112 is slightly inferior to the flame retardant performance inside the impregnation zone 111, the overall flame retardant ability of the prepared geomaterial is not affected due to the isolation property of the flame retardant material. In the multilayer material composite process, selecting the overlap rate of the impregnation zones 112 on the upper and lower sides of the membrane material 12 between 15% and 50% can facilitate the control of the feeding rhythm and progress of different raw material rollers.

[0041] As mentioned above, Appendix Figure 1 The details shown are for illustrative purposes or to facilitate the description of the concept of the invention, and are not intended to limit the invention. Figure 1 The two-layer fabric and one-layer membrane structure shown is a preferred application of the present invention, but it is not the only application of the present invention. For example, in the above-mentioned flame-retardant geomaterials, it is possible that there are other material layers between the fabric material 11 and the membrane material 12; or, in the above-mentioned flame-retardant geomaterials, it is possible that there are other material layers outside the two fabric materials 11; even, the membrane material 12 itself may be a composite membrane with other interlayers in the center or without interlayers.

[0042] The membrane material used in this invention is generally not limited, such as LDPE, HDPE, PE, PVC, etc., which are commonly used in engineering.

[0043] In addition, it should be noted that, due to the production process and equipment control precision, as long as the produced flame-retardant geotextile 10 basically meets the conditions limited by the present invention, it should be regarded as a product of the present invention. For example, in large-format products, the impregnation areas 111 on the upper and lower sides of the membrane material 12 have only a small area of ​​slight overlap, which is a normal production control deviation and should not be regarded as a product that deviates from the present invention.

[0044] Example 2

[0045] Secondly, the present invention provides a preparation process for flame-retardant geotextile materials, used to prepare the flame-retardant geotextile material 10 described in Example 1.

[0046] The preparation process includes:

[0047] Step 1: Preparation of Fabric Layer Material by Impregnation Method 11 Process

[0048] The continuously conveyed fabric material is intermittently immersed in flame retardant material at a set frequency to obtain fabric material intermittently impregnated with flame retardant material. The fabric material intermittently impregnated with flame retardant material is dried to obtain fabric material 11 with discontinuous high flame retardant area.

[0049] The specific steps for this process can be combined with... Figure 2 The working module shown is described below. Specifically, the fabric raw material used to prepare the fabric layer material 11 is continuously conveyed on a set of conveying rollers. The set of conveying rollers includes a conveying pressure roller 20 that presses the fabric raw material into the flame retardant material to be impregnated. The continuous conveying of the fabric raw material is intermittently impregnated into the flame retardant material at a set frequency through the relative movement between the conveying pressure roller 20 and the flame retardant material trough 30. Preferably, the flame retardant material trough 30 moves toward the conveying pressure roller 20, so that the tension of the conveying roller does not need to be repeatedly adjusted.

[0050] The drive mechanism 40 that causes the flame-retardant material tank 30 to move up and down at a set frequency can be of various types, such as, but not limited to, those mentioned above. Figure 2 The cam-based drive mechanism shown is Figure 2 (A) shows the state of the fabric material detached from the flame retardant material. Figure 2 (B) shows the state of the fabric raw material being impregnated with flame retardant material. The fabric material 11 can be obtained by alternating between the two states.

[0051] Preferably, the fabric material with flame retardant material impregnated at intervals is directly conveyed to a drying channel that can provide a sufficiently high heating temperature for auxiliary drying under the conveying of a set of conveying rollers. Since the flame retardant material is impregnated at intervals on the fabric material, compared with the full impregnation process, not only is the use of flame retardant material saved, but the drying time is also greatly shortened. Moreover, in the subsequent multi-layer material composite, since the areas of the fabric material 11 impregnated with flame retardant material are staggered and stacked, the heat adhesion and compressibility of the multi-layer material can be maintained well.

[0052] Step 2: Multilayer Material Composite Process

[0053] The fabric layer material 11 prepared in step one is laminated to both sides of the membrane layer material 12 through an online bonding process to obtain the flame-retardant geotextile material.

[0054] Because of the online continuous conveying process described in step one, the impregnation process and the composite process can be smoothly connected in this step. Preferably, the multilayer material composite process and the preparation process of the membrane material 12 are also directly connected. The membrane material 12 that comes off the production line of the membrane material 12 is a membrane material 12 that still has residual heat and stickiness after stretching. This membrane material 12 with residual heat and stickiness is directly fed into the roller press unit together with the cloth material 11 that comes off the drying channel in step one for pressurized heat bonding to obtain the flame-retardant geotextile 10 blank material. Since the areas of the cloth material 11 impregnated with flame-retardant material are staggered and stacked, the heat adhesion and compressibility of the multilayer material can be maintained well. Since the cloth material 11 prepared in step one has also just been heated and dried, the residual heat is directly utilized, which can improve the process effect and save a certain amount of energy.

[0055] Example 3

[0056] Thirdly, the present invention provides a geomembrane product.

[0057] Following the preparation process of flame-retardant geotextiles described in Example 2, the flame-retardant geotextile blank material 10 obtained by pressurized heat bonding in step two can be further refined, cut, rolled and packaged to prepare the required geomembrane products.

[0058] The above embodiments are merely preferred implementations of the present invention. For those skilled in the art, any modifications or improvements made without departing from the concept of the present invention should fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A flame-retardant geomaterial, wherein the flame-retardant geomaterial (10) is a multilayer composite material comprising a fabric layer (11) and a membrane layer (12), wherein the fabric layer (11) is disposed on the upper and lower sides of the membrane layer (12), characterized in that, The upper and lower sides of the fabric material (11) are all impregnated with flame retardant material at intervals to form discontinuous high flame retardant areas. Each high flame retardant area includes a middle impregnated area (111) and two sides impregnated areas (112). Furthermore, the impregnated areas (111) on the upper and lower sides of the membrane material (12) do not overlap. The opposite side of the impregnated area (111) on each side is the unimpregnated area of ​​the fabric material (11). The fabric layer material (11) on both the upper and lower sides is tightly attached to the membrane layer material (12). The impregnation zones (112) on the upper and lower sides of the membrane material (12) overlap: 15%≤overlap rate≤50%. The cloth material (11) is prepared by impregnation method, so that the continuously conveyed cloth material is intermittently impregnated in the flame retardant material at a set frequency to obtain the cloth material intermittently impregnated with the flame retardant material.

2. The flame-retardant geomaterial according to claim 1, characterized in that, The application method is pressure heat bonding.

3. The flame-retardant geomaterial according to claim 1, characterized in that, Each impregnation zone (111) in a fabric layer (11) has the same width.

4. The flame-retardant geomaterial according to claim 3, characterized in that, The spacing between the impregnation zones (111) in a fabric layer (11) is equal.

5. A preparation process for the flame-retardant geotextile material according to any one of claims 1-4, characterized in that, include: Step 1: Preparation of fabric layer material by impregnation method (11) process The continuously conveyed fabric material is intermittently immersed in flame retardant material at a set frequency to obtain fabric material intermittently impregnated with flame retardant material, and the fabric material intermittently impregnated with flame retardant material is dried to obtain the fabric material (11) with discontinuous high flame retardant area. Step 2: Multilayer Material Composite Process The fabric material (11) prepared in step one is laminated to both sides of the membrane material (12) through an online bonding process to obtain the flame-retardant geotextile material according to any one of claims 1-4.

6. A geomembrane product, characterized in that, The flame-retardant geomaterial described in any one of claims 1-4 is used.

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