Modified starch for spinning and preparation method thereof

Abstract

The invention discloses modified starch for spinning and a preparation method thereof, and the preparation method comprises the following steps: S1, soaking and cleaning cassava; s2, putting the cleaned cassava into a drying device for surface drying; s3, crushing cassava to obtain cassava slurry, and separating the cassava slurry into starch slurry by using a centrifugal machine; s4, adding the starch slurry, a catalyst, an oxidizing agent, a stabilizing agent and an etherifying agent into a mixing device for mixing reaction; s5, performing slurry concentration on the slurry subjected to the mixed reaction by using a concentrator, and dehydrating the concentrated slurry; s6, feeding the dehydrated starch into a hot air drying system for drying; and S7, feeding the dried modified starch into a stock bin of a loading machine, and bagging and packaging. By adding the oxidizing agent, part of hydroxyl groups in a starch macromolecular structure can be oxidized into carboxyl groups, so that the adhesive property is enhanced; the etherifying agent is added, so that the modified starch can be subjected to etherification-oxidation composite modification.

Description

Technical Field

[0001] The invention relates to the technical field of modified starch, and in particular to modified starch for textile use and a preparation method thereof. Background Art

[0002] Modified starch can be customized according to the specific requirements of users to suit special purposes. In order to improve the performance of starch and expand its application range, physical, chemical or enzymatic treatment is used to introduce new functional groups on starch molecules or change the size of starch molecules and the properties of starch particles, thereby changing the natural properties of starch (such as gelatinization temperature, thermal viscosity and its stability, freeze-thaw stability, gel strength, film-forming property, transparency, etc.) to make it more suitable for certain application requirements. This kind of starch that has undergone secondary processing and changed its properties is collectively referred to as modified starch. In the textile industry, in order to improve textile efficiency, cassava starch is often used as a sizing agent to harden and protect yarn. Sizing agent is one or more polymer substances that can form a film. Its function is to make a finishing slurry and roll it on the fabric so that it adheres to the surface of the fabric. After drying, a film is formed to wrap the surface of the fabric, thereby giving the fabric a smooth, thick, plump and stiff feel. When configuring the slurry, fillers are also added to increase the weight of the fabric, fill the holes in the cloth, and make the fabric smooth and thick.

[0003] The preparation methods of modified starch in China are mainly solution methods, including aqueous solution method and organic solvent method. The aqueous solution method can only produce products with a degree of substitution less than 0.1. The organic solvent method requires a large amount of organic solvent, which is difficult to recover the solvent, has a low recovery rate, and a high product cost. Another common disadvantage of the solution method is that the obtained modified starch has poor bonding properties. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a modified starch for textile use and a preparation method thereof, wherein part of the hydroxyl groups in the starch macromolecular structure can be oxidized to carboxyl groups by adding an oxidant, thereby enhancing the bonding performance; and the modified starch can be subjected to etherification-oxidation composite modification by adding an etherifying agent.

[0005] The technical solution provided by the present invention to solve the above problems is: a method for preparing modified starch for textile use, the preparation method comprising the following steps:

[0006] S1. Soaking and washing the cassava;

[0007] S2, the cleaned cassava is placed in a drying device for surface drying;

[0008] S3, crushing the cassava to obtain cassava slurry, and separating the cassava slurry into starch slurry by a centrifuge;

[0009] S4, adding starch slurry, catalyst, oxidant, stabilizer and etherifying agent into a mixing device for mixing reaction;

[0010] S5, using a concentrator to concentrate the slurry after the mixed reaction, and then dehydrating the concentrated slurry;

[0011] S6, sending the dehydrated starch into a hot air drying system for drying;

[0012] S7, sending the dried modified starch into the silo of the loader for bagging and packaging.

[0013] Preferably, the catalyst in S4 is one or more of copper sulfate, sodium salt of dioctyl sulfosuccinate, fatty alcohol polyoxyethylene ether, and sorbitan oleate.

[0014] Preferably, the oxidant in S4 is hydrogen peroxide.

[0015] Preferably, the stabilizer in S4 is sodium trimetaphosphate or urea.

[0016] Preferably, the etherifying agent in S4 is sodium monochloroacetate.

[0017] Preferably, the amount of the catalyst added in S4 is 0.005%-0.025%, the amount of the oxidant added is 1.4%-3.2%, the amount of the stabilizer added is 0.045%-0.55%, and the amount of the etherifying agent added is 7%-12%.

[0018] Preferably, the mixing device in S4 comprises a mixing tank, a stirring assembly and a locking assembly;

[0019] The stirring assembly is installed on the mixing tank to stir the materials in the mixing tank;

[0020] The mixing tank is provided with a feed inlet, and an openable feed plate is installed in the feed inlet;

[0021] The locking assembly is used to lock the feed plate. When the stirring assembly drives the material in the mixing tank to stir, the locking assembly opens the lock on the feed plate. When the stirring assembly stops stirring, the locking assembly releases the lock on the feed plate.

[0022] Preferably, the stirring assembly includes a stirring motor, a stirring shaft and a plurality of stirring paddles. The stirring motor is installed at the upper end of the mixing tank. One end of the stirring shaft is connected to the output end of the stirring motor and the other end extends into the interior of the mixing tank. The plurality of stirring paddles are installed on the stirring shaft.

[0023] Preferably, the locking assembly comprises a follower frame, a rotating ring, a mounting sleeve, a lifting ring and a locking rod, the mounting sleeve is vertically arranged on the inner wall of the upper cover of the mixing tank, the lifting ring and the rotating ring are sequentially mounted on the mounting sleeve up and down, the outer circumferential surface of the mounting sleeve is surrounded by a spiral upward guide groove, the inner ring of the rotating ring is provided with a guide column matching the guide groove, the rotating ring is fixedly connected to the center position of the follower frame, the inner wall of the upper cover of the mixing tank is provided with a guide rod, the lifting ring is provided with a guide hole matching the guide rod, a spring 1 is mounted on the mounting sleeve, one end of the spring 1 abuts against the inner wall of the upper cover of the mixing tank, and the other end abuts against the upper end face of the lifting ring, and the locking rod is fixedly connected to the side end face of the lifting ring; a card slot matching with the feed plate is installed at the feed inlet, the feed plate can slide in the feed inlet along the card slot, and the lower end face of the feed plate is provided with a card slot that can be engaged with the locking rod.

[0024] The present invention also discloses a modified starch for textile use, which is prepared by any one of the preparation methods described above.

[0025] Compared with the prior art, the advantages of the present invention are: by adding an oxidant, part of the hydroxyl groups in the starch macromolecular structure can be oxidized to carboxyl groups, thereby enhancing the bonding performance; by adding an etherifying agent, the modified starch can undergo etherification-oxidation composite modification. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 It is a flowchart of the preparation method of the present invention;

[0028] Figure 2 is a schematic diagram of a mixing device of the present invention;

[0029] Figure 3 is a cross-sectional view of a mixing tank of the present invention;

[0030] Figure 4 yes Figure 3 The enlarged schematic diagram of point A in the middle;

[0031] Figure 5 It is a top view of the rotating ring and the follower frame;

[0032] Figure 6 It is a three-dimensional structural schematic diagram of the installation sleeve of the present invention;

[0033] Figure 7 It is a front view of the installation sleeve of the present invention.

[0034] The attached drawings are marked with: 1. mixing tank, 2. stirring motor, 3. feed plate, 4. locking rod, 5. feed port, 6. upper fixing ring, 7. connecting rod, 8. driving rod, 9. stirring paddle, 10. stirring shaft, 11. spring three, 12. driving ring, 13. guide rod, 14. lifting ring, 15. mounting sleeve, 16. upper connecting ring, 17. spring two, 18. lower connecting ring, 19. bearing, 20. guide column, 21. guide groove, 22. spring one, 23. bayonet, 24. lower fixing ring. DETAILED DESCRIPTION

[0035] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0036] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise specified and limited, the terms "assemble", "connect", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0040] It should also be understood that the terms used in this description of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the description of the embodiments of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms.

[0041] Example 1

[0042] In this embodiment, Figure 1 As shown, a method for preparing modified starch for textile use comprises the following steps:

[0043] S1. Soaking and washing the cassava;

[0044] S2, the cleaned cassava is placed in a drying device for surface drying;

[0045] S3, crushing the cassava to obtain cassava slurry, and separating the cassava slurry into starch slurry by a centrifuge;

[0046] S4, adding starch slurry, catalyst, oxidant, stabilizer and etherifying agent into a mixing device for mixing reaction;

[0047] S5, using a concentrator to concentrate the slurry after the mixed reaction, and then dehydrating the concentrated slurry;

[0048] S6, sending the dehydrated starch into a hot air drying system for drying;

[0049] S7, sending the dried modified starch into the silo of the loader for bagging and packaging.

[0050] Among them, the catalyst in S4 is one or more of copper sulfate, sodium salt of dioctyl sulfosuccinate, fatty alcohol polyoxyethylene ether, and dehydrated sorbitan oleate; the oxidant in S4 is hydrogen peroxide; the stabilizer is sodium trimetaphosphate or urea; and the etherifying agent is sodium monochloroacetate.

[0051] Specifically, the amount of catalyst added in S4 is 0.005%-0.025%, the amount of oxidant added is 1.4%-3.2%, the amount of stabilizer added is 0.045%-0.55%, and the amount of etherifying agent added is 7%-12%.

[0052] In the above scheme, by adding an oxidant, part of the hydroxyl groups in the starch macromolecular structure can be oxidized to carboxyl groups, thereby enhancing the bonding performance; by adding an etherifying agent, the modified starch can undergo etherification-oxidation composite modification.

[0053] Example 2

[0054] like Figure 2-7 As shown, the mixing device in S4 includes a mixing tank 1, a stirring assembly and a locking assembly;

[0055] The stirring assembly is installed on the mixing tank 1 to stir the materials in the mixing tank 1;

[0056] The mixing tank 1 is provided with a feed port 5, and an openable feed plate 3 is installed in the feed port 5;

[0057] The locking assembly is used to lock the feed plate 3. When the stirring assembly drives the material in the mixing tank 1 to stir, the locking assembly opens the lock on the feed plate 3. When the stirring assembly stops stirring, the locking assembly releases the lock on the feed plate 3.

[0058] In this embodiment, further, the stirring assembly includes a stirring motor 2, a stirring shaft 10 and a plurality of stirring paddles 9, the stirring motor 2 is installed at the upper end of the mixing tank 1, one end of the stirring shaft 10 is connected to the output end of the stirring motor 2, and the other end extends into the interior of the mixing tank 1, and a plurality of stirring paddles 9 are installed on the stirring shaft 10.

[0059] Furthermore, the locking assembly includes a follower frame, a rotating ring, a mounting sleeve 15, a lifting ring 14 and a locking rod 4, wherein the mounting sleeve 15 is vertically arranged on the inner wall of the upper cover of the mixing tank 1, and the lifting ring 14 and the rotating ring are sequentially mounted on the mounting sleeve 15 from top to bottom, and a spiral upward guide groove 21 is arranged around the outer circumference of the mounting sleeve 15, and a guide column 20 matching the guide groove 21 is arranged on the inner ring of the rotating ring, and the rotating ring is fixedly connected to the center position of the follower frame, and the lifting ring 14 and the rotating ring are arranged on the inner wall of the upper cover of the mixing tank 1. A guide rod 13 is provided, and a guide hole cooperating with the guide rod 13 is provided on the lifting ring 14. A spring 22 is mounted on the mounting sleeve 15. One end of the spring 22 abuts against the inner wall of the upper cover of the mixing tank 1, and the other end abuts against the upper end surface of the lifting ring 14. The locking rod 4 is fixedly connected to the side end surface of the lifting ring 14. A slot cooperating with the feed plate 3 is installed at the feed port 5. The feed plate 3 can slide in the feed port 5 along the slot, and the lower end surface of the feed plate 3 is provided with a slot 23 that can engage with the locking rod 4.

[0060] Specifically, the follower frame includes an upper fixed ring, a lower fixed ring, a plurality of connecting rods and a plurality of driving rods, wherein the plurality of connecting rods are radially mounted on the outer circumference of the rotating ring, the inner ring of the upper fixed ring is connected to the end of the connecting rod away from the rotating ring, the annular array of driving rods is mounted on the lower end surface of the upper fixed ring, the lower fixed ring is connected to the end of the driving rod away from the upper fixed ring, and one side of the driving rod is arranged close to the inner wall of the mixing tank. In this solution, on the one hand, the follower frame rotates with the material at the beginning of stirring, thereby driving the locking assembly to lock the feed plate, and on the other hand, the driving rod in the follower frame is arranged close to the inner wall of the mixing tank, and the material will collide with the driving rod during the stirring process, thereby improving the stirring effect at the inner wall of the mixing tank, and can effectively reduce the material from adhering to the inner wall of the mixing tank.

[0061] Among them, a horizontal positioning groove is also arranged on the mounting sleeve, and the horizontal positioning groove is connected to the upper end of the guide groove. A spring three is arranged in the horizontal positioning groove. When the follower ring rotates, it drives the rotating ring to rotate. During the rotation of the rotating ring, the guide column enters into the horizontal positioning groove from the guide groove and squeezes the spring three in the horizontal positioning groove. When the follower ring stops rotating, the guide column is separated from the horizontal positioning groove and enters into the guide groove under the action of the spring three.

[0062] Furthermore, in order to improve the stability of the stirring shaft during rotation, a mounting groove is provided on the inner ring of the mounting sleeve, a bearing is installed in the mounting groove, and the inner ring of the bearing cooperates with the stirring shaft.

[0063] Those skilled in the art will know that the materials in the mixing tank will be stirred along with the stirring shaft during the stirring process. If the staff opens the discharge plate on the mixing tank during the operation of the stirring assembly, the materials in the mixing tank may splash out, and some external impurities may easily enter the mixing tank through the feed port and affect the materials in the mixing tank. Therefore, in the above technical scheme, when the stirring motor drives the stirring shaft to rotate, the stirring paddle drives the materials to move along the rotation direction of the stirring shaft. During the movement of the materials, the driving plate is driven to rotate along with the materials, thereby driving the rotating ring to rotate. During the rotation of the rotating ring, the guide column is driven to move along the guide groove The lifting ring then drives the locking rod to disengage from the bayonet during the downward movement of the lifting ring, and the feed plate cannot move horizontally along the slot. Therefore, the feed port is locked. When the material reaction is completed, the stirring assembly stops working, and the material in the mixing tank is in a stationary state. The guide column disengages from the horizontal positioning slot and enters the guide slot under the action of spring three. At the same time, spring one drives the lifting ring downward, and the rotating ring moves downward under the action of the follower frame, its own gravity and the elastic force of spring one. During the downward movement of the lifting ring, the locking rod is disengaged from the bayonet, and the feed plate can be opened normally.

[0064] It should be noted that in the process of production, it is sometimes necessary to add materials into the mixing tank midway, therefore, a lock release assembly is also included, the lock release assembly includes a drive ring, the upper cover of the mixing tank is provided with an annular mounting groove for installing the drive ring, the lower end of the drive ring is abutted against the upper end of the lifting ring, the rotating ring includes a lower connecting ring, an upper connecting ring and a spring 2, one end of the spring 2 is connected to the upper connecting ring, and the other end is connected to the lower connecting ring, and the guide column is provided on the lower connecting ring. When it is necessary to open the feed plate midway, a special tool can be used to press down on the drive ring, and the process of pressing down the drive ring drives the lifting ring to compress the spring 2 downward, the locking rod can be disengaged from the bayonet, and the feed plate can be opened normally. This solution can ensure that the stirring assembly can work normally during the process of opening the feed plate, thereby improving the working efficiency of the stirring assembly.

[0065] Example 3

[0066] This embodiment discloses a modified starch for textile use, which is prepared by the preparation method described in Example 1.

[0067] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A method for preparing modified starch for textile use, characterized in that: The preparation method comprises the following steps: S1. Soaking and washing the cassava; S2, the cleaned cassava is placed in a drying device for surface drying; S3, crushing the cassava to obtain cassava slurry, and separating the cassava slurry into starch slurry by a centrifuge; S4, adding starch slurry, catalyst, oxidant, stabilizer and etherifying agent into a mixing device for mixing reaction; S5, using a concentrator to concentrate the slurry after the mixed reaction, and then dehydrating the concentrated slurry; S6, sending the dehydrated starch into a hot air drying system for drying; S7, sending the dried modified starch into the silo of the loader for bagging and packaging.

2. The method for preparing modified starch for textile use according to claim 1, characterized in that: The catalyst in S4 is one or more of copper sulfate, sodium salt of dioctyl sulfosuccinate, fatty alcohol polyoxyethylene ether, and sorbitan oleate.

3. The method for preparing a modified starch for textile use according to claim 1, characterized in that: The oxidant in S4 is hydrogen peroxide.

4. The method for preparing modified starch for textile use according to claim 1, characterized in that: The stabilizer in S4 is sodium trimetaphosphate or urea.

5. The method for preparing modified starch for textile use according to claim 1, characterized in that: The etherifying agent in S4 is sodium monochloroacetate.

6. The method for preparing modified starch for textile use according to claim 1, characterized in that: The amount of catalyst added in S4 is 0.005%-0.025%, the amount of oxidant added is 1.4%-3.2%, the amount of stabilizer added is 0.045%-0.55%, and the amount of etherifying agent added is 7%-12%.

7. The method for preparing modified starch for textile use according to claim 1, characterized in that: The mixing device in S4 comprises a mixing tank (1), a stirring assembly and a locking assembly; The stirring assembly is installed on the mixing tank (1) and is used to stir the materials in the mixing tank (1); The mixing tank (1) is provided with a feed port (5), and an openable feed plate (3) is installed in the feed port (5); The locking component is used to lock the feed plate (3); when the stirring component drives the material in the mixing tank (1) to stir, the locking component starts locking the feed plate (3); when the stirring component stops stirring, the locking component releases the lock on the feed plate (3).

8. The method for preparing modified starch for textile use according to claim 7, characterized in that: The stirring assembly comprises a stirring motor (2), a stirring shaft (10) and a plurality of stirring paddles (9); the stirring motor (2) is mounted on the upper end of the mixing tank (1); one end of the stirring shaft (10) is connected to the output end of the stirring motor (2) and the other end extends into the interior of the mixing tank (1); and the plurality of stirring paddles (9) are mounted on the stirring shaft (10).

9. The method for preparing a modified starch for textile use according to claim 7 or 8, characterized in that: The locking assembly comprises a follower frame, a rotating ring, a mounting sleeve (15), a lifting ring (14) and a locking rod (4); the mounting sleeve (15) is vertically arranged on the inner wall of the upper cover of the mixing tank (1); the lifting ring (14) and the rotating ring are sequentially mounted on the mounting sleeve (15) from top to bottom; a spiral upward guide groove (21) is arranged on the outer circumferential surface of the mounting sleeve (15); a guide column (20) matching the guide groove (21) is arranged on the inner ring of the rotating ring; the rotating ring is fixedly connected to the center position of the follower frame; a guide rod (14) is arranged on the inner wall of the upper cover of the mixing tank (1); 3), the lifting ring (14) is provided with a guide hole cooperating with the guide rod (13), the mounting sleeve (15) is provided with a spring (22), one end of the spring (22) abuts against the inner wall of the upper cover of the mixing tank (1), and the other end abuts against the upper end surface of the lifting ring (14), and the locking rod (4) is fixedly connected to the side end surface of the lifting ring (14); a slot cooperating with the feed plate (3) is installed at the feed port (5), the feed plate (3) can slide in the feed port (5) along the slot, and the lower end surface of the feed plate (3) is provided with a slot (23) that can engage with the locking rod (4).

10. A modified starch for textile use, characterized in that: It is prepared by the preparation method according to any one of claims 1 to 9.

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