An adjuvant for dispersing organic fibers and a method for preparing the same

Abstract

The application belongs to the technical field of organic fiber dispersion, and particularly relates to an additive for dispersing organic fibers and a preparation method thereof. The raw material of the additive for dispersing organic fibers comprises ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide. The additive for dispersing organic fibers is prepared by using the above-mentioned raw materials, so that the wetting capacity of the surface of the organic fibers can be adjusted when the organic fibers are prepared by a wet felt method, and the dispersibility of the organic fibers is improved. The agglomeration of the organic fibers in the process of the wet felt preparation is reduced, the void ratio of the organic fiber wet felt is improved, and the heat insulation performance of the organic fiber wet felt is improved, so that the heat preservation effect is maximally reserved. Meanwhile, the additive can be micro-crosslinked in the baking and dehydration process in the process of the wet felt preparation, so that the strength and tensile strength of the organic fiber wet felt are improved.

Description

Technical Field

[0001] This invention belongs to the field of organic fiber dispersion technology, and specifically relates to an additive for dispersing organic fibers and its preparation method. Background Technology

[0002] In household appliances requiring refrigeration or freezing functions (such as refrigerators), thermal insulation materials are typically used. Vacuum insulation panels (VIPs) are widely used in household appliances due to their excellent thermal insulation properties. The structure of a vacuum insulation panel generally includes: a core material, a getter / desiccant, and an outer packaging film; among these, the core material is the core material of the entire vacuum insulation panel, and its material and structural composition have a significant impact on the thermal conductivity of the vacuum insulation panel.

[0003] Currently, the core material of vacuum insulation panels on the market is mainly glass fiber. Glass fiber cores have high porosity and low thermal conductivity. However, the production process of glass fiber cores requires cutting, resulting in a large amount of glass fiber dust that adheres to the skin and mucous membranes, causing strong irritation and potentially leading to skin diseases, eye diseases, and even respiratory diseases. Furthermore, the glass fiber industry is a high-energy-consuming and high-polluting industry, and the location of its production plants is strictly restricted.

[0004] Therefore, in recent years, researchers have been committed to the research of environmentally friendly vacuum insulation panels, and organic fibers have become the mainstream direction due to their variety and ease of modification. However, the production of wet-laid felt using organic fiber core materials has problems such as poor fiber dispersion and unsuitable roll strength, resulting in fiber agglomeration and low porosity in the wet-laid felt, which leads to a decline in the performance of the produced vacuum insulation panels.

[0005] Therefore, in view of the above shortcomings, this invention is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide an additive for dispersing organic fibers and its preparation method, so as to solve the problems of fiber agglomeration and low porosity in the existing organic fiber wet-laid felt.

[0007] The first aspect of the present invention provides an additive for dispersing organic fibers, the raw materials of which include ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide.

[0008] The additive for dispersing organic fibers provided by this invention may also have the following additional technical features:

[0009] In one specific embodiment of the present invention, the weight ratio of the ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide is 1:(0.01-0.05):(0-3):(1-5).

[0010] In one specific embodiment of the present invention, the weight ratio of ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide is 1:0.03:1:3.

[0011] In one specific embodiment of the present invention, an azo initiator is further included, which is used to initiate the polymerization of the ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide.

[0012] A second aspect of the present invention also provides a method for preparing an auxiliary agent for dispersing organic fibers as described in any one of the above claims, comprising the following steps:

[0013] S100: A mixed solution is prepared by uniformly mixing ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, acrylamide and water.

[0014] S200: An azo initiator is added to the mixed solution to react and obtain an auxiliary agent for dispersing organic fibers.

[0015] In one specific embodiment of the present invention, S100 includes:

[0016] Pure water and ethylene glycol monovinyl polyethylene glycol ether were added sequentially to the polymerization reactor and stirred until homogeneous to obtain mixed solution A;

[0017] Heat mixed solution A to 10–45°C;

[0018] Allyl glycidyl ether, acrylic acid, acrylamide, and pure water are mixed evenly to obtain mixed solution B;

[0019] While stirring, mixed solution B is added dropwise to mixed solution A in the polymerization reactor to obtain a mixed solution.

[0020] In one specific embodiment of the present invention, the mixed solution A is heated to 35°C.

[0021] In one specific embodiment of the present invention, S200 further includes: expelling oxygen from the polymerization reactor before adding the azo initiator.

[0022] In one specific embodiment of the present invention, the organic fiber includes at least one of polyester fiber, polyethylene fiber, polypropylene fiber, polyvinyl alcohol fiber, polyacrylonitrile fiber, polystyrene fiber, and polylactic acid fiber.

[0023] The second aspect of the present invention also provides the use of any of the above-described additives in the preparation of wet-laid organic fiber felts.

[0024] The additive for dispersing organic fibers provided by this invention is prepared using the aforementioned raw materials. Therefore, during the preparation of organic fiber wet-laid felt, it can adjust the wetting ability of the organic fiber surface, thereby improving the dispersibility of the organic fibers, reducing the agglomeration of organic fibers during the wet-laid felt preparation process, increasing the porosity of the organic fiber wet-laid felt, and thus improving the thermal insulation performance of the organic fiber wet-laid felt, maximizing its heat preservation effect. At the same time, the additive can also undergo micro-crosslinking during the baking and dehydration process in the wet-laid felt preparation process, thereby improving the strength and tensile strength of the organic fiber wet-laid felt. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a flowchart of an auxiliary agent preparation method in one embodiment of the present invention. Detailed Implementation

[0027] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0028] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0029] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0030] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0031] The purpose of this invention is to provide an additive for dispersing organic fibers and its preparation method, so as to solve the problems of fiber agglomeration and low porosity in the existing organic fiber wet-laid felt.

[0032] In a first aspect, in some embodiments of the present invention, the present invention provides an additive for dispersing organic fibers, the raw materials of which include ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide.

[0033] The additive for dispersing organic fibers provided by the present invention, prepared using the aforementioned raw materials, can adjust the wetting ability of the organic fiber surface during the preparation of organic fiber wet-laid felt, thereby improving the dispersibility of the organic fibers, reducing the agglomeration of organic fibers during the wet-laid felt preparation process, increasing the porosity of the organic fiber wet-laid felt, and thus improving the thermal insulation performance of the organic fiber wet-laid felt, maximizing its heat preservation effect. Simultaneously, the additive can also undergo micro-crosslinking during the baking and dehydration process in the wet-laid felt preparation process, thereby improving the strength and tensile strength of the organic fiber wet-laid felt. Correspondingly, it can improve the strength of vacuum insulation panels with organic fibers as the core material and reduce their thermal conductivity.

[0034] In one specific embodiment of the present invention, the weight ratio of ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide is 1:(0.01-0.05):(0-3):(1-5).

[0035] Specifically, using ethylene glycol monovinyl polyethylene glycol ether as a reference, the ratio of allyl glycidyl ether can be adjusted between 1:0.01 and 1:0.05, for example, 1:0.02, 1:0.03, 1:0.04, etc. Similarly, the ratio of ethylene glycol monovinyl polyethylene glycol ether to acrylic acid can be adjusted between 1:0 and 1:3, for example, 1:0.1, 1:1, 1:2, 1:2.5, etc. The ratio of ethylene glycol monovinyl polyethylene glycol ether to acrylamide can be adjusted between 1:1 and 1:5, for example, 1:1.5, 1:2, 1:3, 1:4, etc.

[0036] In one specific embodiment of the present invention, the weight ratio of ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide is 1:0.03:1:3.

[0037] In one specific embodiment of the present invention, an azo initiator is also included, which is used to initiate the polymerization of ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide.

[0038] Specifically, azo initiators may include azobisisobutyronitrile (AIBN) and azobisisoheptanenitrile (AIHH). By adding an azo initiator, ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide can undergo polymerization reactions.

[0039] Reference Figure 1 In a second aspect, the present invention also provides a method for preparing an additive for dispersing organic fibers for any of the above-mentioned purposes, comprising the following steps:

[0040] S100: A mixed solution is prepared by uniformly mixing ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, acrylamide and water.

[0041] S200: An azo initiator is added to the mixed solution to react and obtain an auxiliary agent for dispersing organic fibers.

[0042] In one specific embodiment of the present invention, S100 includes:

[0043] Pure water and ethylene glycol monovinyl polyethylene glycol ether were added sequentially to the polymerization reactor and stirred until homogeneous to obtain mixed solution A;

[0044] Heat mixed solution A to 10–45°C;

[0045] Allyl glycidyl ether, acrylic acid, acrylamide, and pure water are mixed evenly to obtain mixed solution B;

[0046] While stirring, mixed solution B is added dropwise to mixed solution A in the polymerization reactor to obtain a mixed solution.

[0047] The bottom time for mixed solution B is 40-120 minutes, with stirring during the dropwise addition.

[0048] In one specific embodiment of the present invention, the mixed solution A is heated to 35°C.

[0049] In one specific embodiment of the present invention, S200 further includes: expelling oxygen from the polymerization reactor before adding the azo initiator.

[0050] In one specific embodiment of the present invention, the organic fiber includes at least one selected from polyester fiber, polyethylene fiber, polypropylene fiber, polyvinyl alcohol fiber, polyacrylonitrile fiber, polystyrene fiber, and polylactic acid fiber. As an example, the organic fiber is a polyester fiber, such as polyethylene terephthalate fiber. As an example, the organic fiber is a polyethylene fiber. As an example, the organic fiber is a polypropylene fiber. As an example, the organic fiber is a combination of polyester fiber and polyvinyl alcohol fiber. As an example, the organic fiber is a combination of polyester fiber, polypropylene fiber, and polyvinyl alcohol fiber.

[0051] The second aspect of the present invention also provides the use of any of the above-described additives in the preparation of wet-laid organic fiber felts.

[0052] Specifically, the preparation of organic fiber wet-laid felt includes:

[0053] The additives are dispersed into a liquid to obtain an additive suspension;

[0054] Organic fibers are dispersed into an auxiliary agent suspension to obtain an organic fiber suspension;

[0055] Organic fibers in an organic fiber suspension are formed into a fiber web, which is then dried to obtain fiber cloth.

[0056] The fiber cloth is stacked and then heat-treated to obtain the core material.

[0057] Furthermore, the obtained core material is vacuum heat-sealed into a membrane bag formed by the membrane material to obtain a vacuum insulation panel. This vacuum insulation panel can be used in thermal insulation devices. Specifically, thermal insulation devices include refrigerators, insulated boxes, water heaters, microwave ovens, containers, and building wall panels.

[0058] The technical solution of the present invention will be better understood below with reference to specific embodiments.

[0059] The following examples illustrate the effect of the additives in this invention by using an organic fiber suspension with an organic fiber mass content of 0.1%.

[0060] Example 1

[0061] An additive was prepared using ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide in a weight ratio of 1:0.03:1:3.

[0062] The organic fibers were dispersed in an auxiliary agent solution with a concentration of 0.01%, and stirred to form an organic fiber dispersion suspension containing an organic fiber concentration of 0.1%.

[0063] Example 2

[0064] An additive was prepared using ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide in a weight ratio of 1:0.03:1:3.

[0065] The organic fibers were dispersed in an auxiliary agent solution with a concentration of 0.02%, and stirred to form an organic fiber dispersion suspension containing an organic fiber concentration of 0.1%.

[0066] Example 3

[0067] An additive was prepared using ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, and acrylamide in a weight ratio of 1:0.03:3.

[0068] The organic fibers were dispersed in an auxiliary agent solution with a concentration of 0.01%, and stirred to form a glass fiber dispersion suspension containing an organic fiber concentration of 0.1%.

[0069] Example 4

[0070] An additive was prepared using ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide in a weight ratio of 1:0.03:3:3.

[0071] The organic fibers were dispersed in an auxiliary agent solution with a concentration of 0.01%, and stirred to form a glass fiber dispersion suspension containing an organic fiber concentration of 0.1%.

[0072] Example 5

[0073] An auxiliary agent was prepared using ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide in a weight ratio of 1:0.01:1:3.

[0074] The organic fibers were dispersed in an auxiliary agent solution with a concentration of 0.01%, and stirred to form a glass fiber dispersion suspension containing an organic fiber concentration of 0.1%.

[0075] Example 6

[0076] An additive was prepared using ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide in a weight ratio of 1:0.05:1:3.

[0077] The organic fibers were dispersed in an auxiliary agent solution with a concentration of 0.01%, and stirred to form a glass fiber dispersion suspension containing an organic fiber concentration of 0.1%.

[0078] Example 7

[0079] An additive was prepared using ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide in a weight ratio of 1:0.03:1:1.

[0080] The organic fibers were dispersed in an auxiliary agent solution with a concentration of 0.01%, and stirred to form an organic fiber dispersion suspension containing an organic fiber concentration of 0.1%.

[0081] Example 8

[0082] An additive was prepared using ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide in a weight ratio of 1:0.03:1:5.

[0083] The organic fibers were dispersed in an auxiliary agent solution with a concentration of 0.01%, and stirred to form an organic fiber dispersion suspension containing an organic fiber concentration of 0.1%.

[0084] Comparative Example 1

[0085] Organic fibers are dispersed in water and stirred to form an organic fiber dispersion suspension with an organic fiber concentration of 0.1%.

[0086] Organic fiber performance testing:

[0087] The method for testing the dispersion effect of the organic fibers of this invention is as follows: The organic fiber suspensions dispersed in Examples 1-6 and Comparative Examples 1-4 were formed using a Frank PTI sheeter, with a quantitative concentration of 80 g / m³. 2 After sizing and drying, the uniformity, strength, and thermal conductivity of the glass fiber wet-laid mat were measured.

[0088] Uniformity performance was tested using a paper uniformity tester (2D LAB F / SENSOR, Germany) and expressed as a uniformity index. The uniformity index refers to the number of flocs per square meter of paper, with units of Flocs / m2. The smaller the uniformity index, the fewer flocs per unit area of ​​the glass fiber wet-laid mat, indicating better dispersion of the glass fiber; the larger the uniformity index, the more flocs per unit area of ​​the glass fiber wet-laid mat, indicating poorer dispersion of the glass fiber.

[0089] The strength properties of glass fiber wet-laid mat are characterized by the tensile index, and the testing standard is GB / T 12914-2018.

[0090] The thermal conductivity was measured using the steady-state heat flow method according to the national standard GB / T 10294 / 10295.

[0091] Table 1 shows the test results of wet-laid felts prepared using the organic fiber suspensions of the examples and comparative examples.

[0092]

[0093]

[0094] As shown in Table 1, the dispersion performance of the organic fiber suspension prepared using the additives described in this invention and the strength performance of the organic fiber wet-laid felt prepared using them are both higher than those of the control groups. At the same time, the thermal conductivity of the organic fiber wet-laid felt prepared using them is also lower than that of the control groups. This indicates that the additives demonstrate the high feasibility of the method described in this invention.

[0095] A comparison of the embodiments of the present invention reveals that increasing the concentration of the additives is beneficial to improving the dispersion performance of the organic fiber suspension and the strength of the organic fiber wet-laid felt prepared using it.

[0096] A comparison of the embodiments of the present invention revealed that the absence of acrylic acid does not affect the performance of the additives, but the addition of acrylic acid can improve the performance of the additives.

[0097] Comparative studies of the embodiments of the present invention have shown that when the weight ratio of ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide is 1:0.03:1:3, the improvement effect on organic fiber wet-laid felt is optimal.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An additive for dispersing organic fibers, characterized in that, The raw materials of the additive include ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide, wherein the weight ratio of ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide is 1:(0.01~0.05):(0~3):(1~5). It also includes an azo initiator, which is used to initiate the polymerization of the ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide.

2. The additive for dispersing organic fibers according to claim 1, characterized in that, The weight ratio of the ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide is 1:0.03:1:

3.

3. A method for preparing an additive for dispersing organic fibers as described in any one of claims 1-2, characterized in that, Includes the following steps: S100: A mixed solution is prepared by uniformly mixing ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, acrylamide and water. S200: An azo initiator is added to the mixed solution to react and obtain an auxiliary agent for dispersing organic fibers.

4. The method for preparing the additive for dispersing organic fibers according to claim 3, characterized in that, S100 includes: Pure water and ethylene glycol monovinyl polyethylene glycol ether were added sequentially to the polymerization reactor and stirred until homogeneous to obtain mixed solution A; Heat mixed solution A to 10~45℃; Allyl glycidyl ether, acrylic acid, acrylamide, and pure water are mixed evenly to obtain mixed solution B; While stirring, mixed solution B is added dropwise to mixed solution A in the polymerization reactor to obtain a mixed solution.

5. The method for preparing the additive for dispersing organic fibers according to claim 4, characterized in that, Heat mixed solution A to 35°C.

6. The method for preparing the additive for dispersing organic fibers according to claim 4, characterized in that, S200 also includes: expelling oxygen from the polymerization reactor before adding the azo initiator.

7. The method for preparing the additive for dispersing organic fibers according to claim 3, characterized in that, The organic fibers include at least one of polyester fiber, polyethylene fiber, polypropylene fiber, polyvinyl alcohol fiber, polyacrylonitrile fiber, polystyrene fiber, and polylactic acid fiber.

8. The use of the additive according to any one of claims 1-2 in the preparation of organic fiber wet-laid felt.

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