Assistant for dispersing organic fibers and preparation method thereof

Abstract

The invention belongs to the technical field of organic fiber dispersion, and particularly relates to an additive for dispersing organic fibers and a preparation method thereof, and the raw materials of the additive for dispersing the organic fibers comprise ethylene glycol monovinyl polyglycol ether, allyl glycidyl ether, acrylic acid and acrylamide. The auxiliary agent for dispersing the organic fibers, provided by the invention, is prepared from the raw materials, so that the wetting ability of the surfaces of the organic fibers can be adjusted when an organic fiber wet-process felt is prepared, the dispersity of the organic fibers is further improved, and the agglomeration phenomenon of the organic fibers in the wet-process felt preparation process is reduced; the void ratio of the organic fiber wet-process felt is improved, so that the heat insulation performance of the organic fiber wet-process felt is improved, and the heat preservation effect of the organic fiber wet-process felt is reserved to the greatest extent; and meanwhile, the auxiliary agent can be subjected to micro-crosslinking in a baking dehydration process in a wet-process felt preparation process, so that the strength and the tensile strength of the organic fiber wet-process felt are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of organic fiber dispersion, and particularly relates to an auxiliary agent for dispersing organic fibers and a preparation method thereof. Background Art

[0002] In household appliances (such as refrigerators) that require refrigeration or freezing functions, heat insulation materials are usually needed. Vacuum insulation panels (VIPs) are widely used in household appliances due to their good heat insulation performance. The structural composition of a vacuum insulation panel generally includes: a main core material, a getter / dryer, and an outer packaging film; among them, the core material is the core material of the entire vacuum insulation panel, and its material and structural composition have a great 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. The core material prepared from glass fiber has a high porosity and a low thermal conductivity. However, when using glass fiber to produce the core material, cutting is required during the process, which will cause a large amount of glass fiber dust, adhere to parts such as the skin and mucous membranes, and produce strong irritation, which may cause skin diseases, eye diseases, and even respiratory diseases. At the same time, the glass fiber industry belongs to a high-energy-consuming and highly polluting industry, and the location of its production factories is also strictly restricted.

[0004] Therefore, in recent years, scientific researchers have been committed to the research of environmentally friendly vacuum insulation panels. Organic fibers have become the current mainstream direction due to their advantages of variety and easy modification. However, when using organic fiber core materials to make wet felts, there are problems of poor fiber dispersibility and inappropriate roll strength, resulting in fiber agglomeration and low porosity in the wet felts, and the performance of the produced vacuum insulation panels deteriorates.

[0005] Therefore, in view of the above deficiencies, the present invention is specifically proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide an auxiliary agent for dispersing organic fibers and a preparation method thereof, so as to solve the problems of fiber agglomeration and low porosity in the existing organic fiber wet felts.

[0007] In the first aspect of the present invention, an auxiliary agent for dispersing organic fibers is provided. The raw materials of the auxiliary agent include ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide.

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

[0009] In a 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).

[0010] In a 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 a specific embodiment of the present invention, an azo initiator is further included, and the azo initiator is used to initiate the polymerization of ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide.

[0012] The second aspect of the present invention also provides a preparation method for the auxiliary agent for dispersing organic fibers described in any one of the above, including the following steps:

[0013] S100: Mix ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, acrylamide and water evenly to prepare a mixed solution;

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

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

[0016] Add pure water and ethylene glycol monovinyl polyethylene glycol ether to the polymerization kettle in sequence and stir evenly to obtain a mixed solution A;

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

[0018] Mix allyl glycidyl ether, acrylic acid, acrylamide and pure water evenly to obtain a mixed solution B;

[0019] Under stirring, drop the mixed solution B into the mixed solution A in the polymerization kettle to obtain a mixed solution.

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

[0021] In a specific embodiment of the present invention, S200 further includes: expelling the oxygen in the polymerization kettle before adding the azo initiator.

[0022] In a 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 application of the auxiliary agent described in any one of the above in the preparation of organic fiber wet felts.

[0024] The auxiliary agent for dispersing organic fibers provided by the present invention is prepared by using the above raw materials. Therefore, when preparing the wet felt of organic fibers, it can adjust the wetting ability of the surface of organic fibers, thereby improving the dispersibility of organic fibers, reducing the agglomeration phenomenon of organic fibers during the preparation of wet felt, increasing the porosity of the wet felt of organic fibers, and further improving the heat insulation performance of the wet felt of organic fibers, and maximizing the retention of its heat preservation effect. At the same time, the auxiliary agent can also undergo micro-crosslinking during the baking and dehydration process in the preparation of wet felt, thereby improving the strength and tensile strength of the wet felt of organic fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a flowchart of the preparation method of the auxiliary agent in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The exemplary embodiments of the present invention will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0028] It should be understood that the terms used herein are only for the purpose of describing specific exemplary embodiments and are not intended to be limiting. Unless otherwise clearly indicated in the context, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude 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 to be construed as necessarily requiring them to be executed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps can be used.

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

[0030] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figure to another element or feature, such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figure. For example, if the device in the figure is flipped, the element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both the upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are to be interpreted accordingly.

[0031] The object of the present invention is to provide an auxiliary agent for dispersing organic fibers and a preparation method thereof, so as to solve the problems of fiber agglomeration and low porosity in the existing organic fiber wet felt.

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

[0033] According to the auxiliary agent for dispersing organic fibers provided by the present invention, which is prepared by using the above raw materials, when preparing the organic fiber wet felt, it can adjust the wetting ability of the surface of the organic fibers, thereby improving the dispersibility of the organic fibers, reducing the agglomeration phenomenon of the organic fibers during the preparation of the wet felt, increasing the porosity of the organic fiber wet felt, and further improving the heat insulation performance of the organic fiber wet felt, and maximizing its heat preservation effect; at the same time, the auxiliary agent can also undergo micro-crosslinking during the baking and dehydration process in the preparation of the wet felt, thereby improving the strength and tensile strength of the organic fiber wet felt. Correspondingly, it can improve the strength of the vacuum insulation panel with organic fibers as the core material and reduce its thermal conductivity.

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

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

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

[0037] In a specific embodiment of the present invention, it further includes an azo initiator, and the azo initiator is used to initiate the polymerization of ethylene glycol mono vinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide.

[0038] Specifically, the azo initiator may include azobisisobutyronitrile and azobisisoheptonitrile. By adding the azo initiator, ethylene glycol mono vinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide can undergo a polymerization reaction.

[0039] Referring to Figure 1 , in the second aspect, the present invention also provides a preparation method of an auxiliary for dispersing organic fibers for any one of the above, including the following steps:

[0040] S100: Mix ethylene glycol mono vinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, acrylamide and water evenly to prepare a mixed solution;

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

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

[0043] Sequentially add pure water and ethylene glycol mono vinyl polyethylene glycol ether into a polymerization kettle and stir evenly to obtain a mixed solution A;

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

[0045] Mix allyl glycidyl ether, acrylic acid, acrylamide and pure water evenly to obtain mixed solution B.

[0046] While stirring, add mixed solution B dropwise to mixed solution A in the polymerization kettle to obtain a mixed solution.

[0047] Among them, the bottom shelf time of mixed solution B is 40 min - 120 min, and stir while dropping.

[0048] In a specific embodiment of the present invention, heat mixed solution A to 35°C.

[0049] In a specific embodiment of the present invention, S200 further includes: expelling the oxygen in the polymerization kettle before adding the azo initiator.

[0050] In a 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. As an example, the organic fiber is polyester fiber, such as polyethylene terephthalate fiber. As an example, the organic fiber is polyethylene fiber. As an example, the organic fiber is polypropylene fiber. As an example, the organic fiber is polyester fiber and polyvinyl alcohol fiber. As an example, the organic fiber is polyester fiber, polypropylene fiber and polyvinyl alcohol fiber.

[0051] The second aspect of the present invention also provides the application of the above-mentioned additive in the preparation of organic fiber wet felts.

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

[0053] Disperse the additive into a liquid to obtain an additive suspension;

[0054] Disperse the organic fiber into the additive suspension to obtain an organic fiber suspension;

[0055] Form a fiber web from the organic fiber in the organic fiber suspension, and obtain a fiber cloth after drying;

[0056] Stack the fiber cloths, and then perform heat treatment to obtain a core material.

[0057] Furthermore, vacuum heat-seal the obtained core material in a film bag formed by a film material to obtain a vacuum insulation panel. This vacuum insulation panel can be used in heat insulation devices. Specifically, the heat insulation devices include refrigerators, incubators, water heaters, microwave ovens, containers, and building wall panels.

[0058] The following combines specific embodiments to better understand the technical solutions of the present invention.

[0059] In the following examples, the mass content of organic fibers in the organic fiber suspension is 0.1% to illustrate the effect of the additives in the present invention.

[0060] Example 1

[0061] Prepare the additive with the weight ratio of ethylene glycol mono vinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide being 1:0.03:1:3.

[0062] Disperse the organic fibers into the additive solution with a concentration of 0.01%, and stir to disperse to form an organic fiber dispersion suspension containing 0.1% of organic fibers.

[0063] Example 2

[0064] Prepare the additive with the weight ratio of ethylene glycol mono vinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide being 1:0.03:1:3.

[0065] Disperse the organic fibers into the additive solution with a concentration of 0.02%, and stir to disperse to form an organic fiber dispersion suspension containing 0.1% of organic fibers.

[0066] Example 3

[0067] Prepare the additive with the weight ratio of ethylene glycol mono vinyl polyethylene glycol ether, allyl glycidyl ether and acrylamide being 1:0.03:3.

[0068] Disperse the organic fibers into the additive solution with a concentration of 0.01%, and stir to disperse to form a glass fiber dispersion suspension containing 0.1% of organic fibers.

[0069] Example 4

[0070] Prepare the additive with the weight ratio of ethylene glycol mono vinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide being 1:0.03::3:3.

[0071] Disperse the organic fibers into the additive solution with a concentration of 0.01%, and stir to disperse to form a glass fiber dispersion suspension containing 0.1% of organic fibers.

[0072] Example 5

[0073] Prepare the additive with the weight ratio of ethylene glycol mono vinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide being 1:0.01:1:3.

[0074] Disperse the organic fibers into the additive solution with a concentration of 0.01%, and stir to disperse to form a glass fiber dispersion suspension containing 0.1% of organic fibers.

[0075] Example 6

[0076] Prepare an auxiliary agent with the weight ratio of ethylene glycol mono vinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide being 1:0.05:1:3.

[0077] Disperse the organic fibers into an auxiliary agent solution with a concentration of 0.01%, and stir and disperse to form a glass fiber dispersion suspension containing 0.1% organic fibers.

[0078] Example 7

[0079] Prepare an auxiliary agent with the weight ratio of ethylene glycol mono vinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide being 1:0.03:1:1.

[0080] Disperse the organic fibers into an auxiliary agent solution with a concentration of 0.01%, and stir and disperse to form an organic fiber dispersion suspension containing 0.1% organic fibers.

[0081] Example 8

[0082] Prepare an auxiliary agent with the weight ratio of ethylene glycol mono vinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid and acrylamide being 1:0.03:1:5.

[0083] Disperse the organic fibers into an auxiliary agent solution with a concentration of 0.01%, and stir and disperse to form an organic fiber dispersion suspension containing 0.1% organic fibers.

[0084] Comparative Example 1

[0085] Disperse the organic fibers into water, and stir and disperse to form an organic fiber dispersion suspension containing 0.1% organic fibers.

[0086] Testing of organic fiber properties:

[0087] The testing method for the dispersion effect of the organic fibers of the present invention is as follows: Use a Frank PTI sheet former to form the organic fiber suspension after dispersion in Examples 1-6 and Comparative Examples 1-4 respectively, with a basis weight of 80 g / m 2 . After sizing and drying, measure the evenness performance, strength performance and thermal conductivity of the glass fiber wet felt.

[0088] The evenness performance was tested using a paper evenness tester (2D LAB F / SENSOR, Germany) and expressed as the evenness index, which refers to the number of flocs per square meter of the paper, with the unit of Flocs / m2. The smaller the evenness index, the fewer the flocs per unit area of the glass fiber wet felt, indicating better dispersion of the glass fiber. The larger the evenness index, the more the flocs per unit area of the glass fiber wet felt, indicating worse dispersion of the glass fiber.

[0089] The strength performance of the glass fiber wet felt was characterized by the tensile index, and the detection standard was GB / T 12914-2018.

[0090] Among them, the thermal conductivity was measured by the steady-state heat flow method according to the national standards GB / T 10294 / 10295.

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

[0092]

[0093]

[0094] It can be seen from the results in Table 1 that the dispersion performance of the organic fiber suspension prepared with the additive described in the present invention and the strength performance of the organic fiber wet felt prepared therefrom are both higher than those of each control group. At the same time, the thermal conductivity of the organic fiber wet felt prepared therefrom is also lower than that of each control group, indicating that the method described in the present invention has high feasibility.

[0095] Comparisons of the examples of the present invention found that increasing the concentration of the additive is beneficial to improving the dispersion performance of the organic fiber suspension and the strength performance of the organic fiber wet felt prepared therefrom.

[0096] Comparisons of the examples of the present invention found that the lack of acrylic acid does not affect the performance of the additive, but the addition of acrylic acid can improve the performance of the additive.

[0097] Comparisons of the examples of the present invention found 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 the organic fiber wet felt reaches the optimal.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements 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 auxiliary agent for dispersing organic fibers, characterized in that, The raw materials of the auxiliary agent include ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide.

2. The auxiliary agent 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:(0.01 - 0.05):(0 - 3):(1 - 5).

3. The auxiliary agent 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.

4. The auxiliary agent for dispersing organic fibers according to claim 1, characterized in that, An azo initiator is also included, and the azo initiator is used to initiate the polymerization of the ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, and acrylamide.

5. A preparation method of an auxiliary agent for dispersing organic fibers according to any one of claims 1-4, characterized in that, It includes the following steps: S100: Mix ethylene glycol monovinyl polyethylene glycol ether, allyl glycidyl ether, acrylic acid, acrylamide, and water evenly to prepare a mixed solution. S200: Add an azo initiator to the mixed solution and react to obtain an auxiliary agent for dispersing organic fibers.

6. The preparation method of the auxiliary agent for dispersing organic fibers according to claim 5, characterized in that, S100 includes: Sequentially add pure water and ethylene glycol monovinyl polyethylene glycol ether to the polymerization kettle and stir evenly to obtain a mixed solution A. Heat the mixed solution A to 10 - 45°C. Mix allyl glycidyl ether, acrylic acid, acrylamide, and pure water evenly to obtain a mixed solution B. Under stirring, drop the mixed solution B into the mixed solution A in the polymerization kettle to obtain a mixed solution.

7. The preparation method of the auxiliary for dispersing organic fibers according to claim 6, characterized in that, Heat the mixed solution A to 35°C.

8. The preparation method of the auxiliary agent for dispersing organic fibers according to claim 6, characterized in that, S200 also includes: Before adding the azo initiator, expel the oxygen in the polymerization kettle.

9. The preparation method of the auxiliary agent for dispersing organic fibers according to claim 1, 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.

10. The application of the auxiliary agent according to any one of claims 1 - 4 in the preparation of wet felts of organic fibers.

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