Production process of a low-energy consumption ribbon trademark material

Abstract

The present invention belongs to the technical field of textile trademark tapes, and particularly relates to a production process of a low-energy-consuming ribbon trademark material. Polypropylene, polypropylene resin, acrylic acid, initiator and additives are placed in a closed container, filled with liquid ammonia to form high pressure, and then the pressure is instantaneously released to obtain crystal-varied modified polypropylene. The introduced modified polypropylene yarn greatly reduces the thermal shrinkage rate of the polypropylene fabric and improves the temperature resistance. Then, through cold pad-batch desizing treatment of the polypropylene fabric, the thermal shrinkage rate of the polypropylene fabric is further reduced, full preshrinking is achieved, and the effect of dimensional stability is obtained, so that polypropylene can be used as a trademark material.

Description

Technical Field

[0001] The present invention relates to the technical field of textile trademark tapes, and specifically to a production process of a low-energy consumption ribbon trademark material. Background Art

[0002] As an important carrier of textile information, trademark tapes are mainly used in industries such as clothing, shoes and hats, bedding, toys, etc., to provide consumers with the basic attributes and performance of products. Trademark tapes are continuously woven into strips during production. Each small piece of fabric has marks such as brand names, manufacturers, country names, specifications, etc., and the size can be determined according to needs. Currently, they are mainly prepared by embroidery, weaving, and printing methods. Therefore, trademark tapes need to meet specific functional requirements such as feel and printing. Among them, the printing method usually uses a certain type of fabric as the base cloth, and then obtains trademark cloth through coating and subsequent processing such as calendering and slitting.

[0003] Conventional polyester ribbon trademark materials use 100% polyester. For example, in Chinese Patent CN102704223A, a continuous desizing process for trademark cloth made of synthetic fibers, the synthetic fibers include polyester fiber, polyacrylonitrile fiber, polyamide fiber, etc., and poly(ethylene terephthalate) (polyester) is more preferably used. However, the glass transition temperature of polyester is relatively high (70 - 75°C). To achieve a better fabric surface effect, high-temperature calendering treatment is required. During actual operation, the roller surface temperature of the calender reaches 120 - 180°C, which almost reaches the tolerance limit of the calendered nylon roller. This not only consumes a large amount of energy but also easily causes a short service life (3 months) of the calendering equipment. Polypropylene (PP), as a commonly used synthetic fiber, has a relatively low glass transition temperature of about 10°C, which can reduce the setting width and significantly reduce the calendering temperature to reduce energy consumption. However, PP has poor heat resistance, and its thermal shrinkage rate (about 7.0%) is higher than that of polyester (about 2.5%). If produced according to the conventional process, its printing and washing dimensional stability is also poor and it cannot be used as a trademark material. Summary of the Invention

[0004] In view of the deficiencies of the existing technology, the present invention provides a production process of a low-energy consumption ribbon trademark material. By introducing modified polypropylene yarn, the thermal shrinkage rate of polypropylene fabric is significantly reduced and its heat resistance is improved. At the same time, through cold pad-batch desizing treatment of polypropylene fabric, the thermal shrinkage rate of polypropylene fabric is further reduced, solving the problem that polypropylene cannot be used as a trademark material at present.

[0005] To achieve the above object, the specific technical solution of the present invention is as follows:

[0006] The present invention provides a modified polypropylene fiber with high heat resistance, which is composed of the following components in parts by weight: 30 - 50 parts of polypropylene, 20 - 45 parts of polypropylene resin, 10 - 25 parts of acrylic acid, 1 - 5 parts of initiator, and 5 - 10 parts of auxiliary agent.

[0007] The auxiliary agent is at least one of an antioxidant, a light stabilizer, a heat stabilizer, a colorant, and an inorganic filler; the initiator is azobisisobutyronitrile (AIBN).

[0008] A preparation method of a modified polypropylene fiber with high heat resistance includes the following steps:

[0009] S1. Mix polypropylene, polypropylene resin, acrylic acid, an initiator, and an auxiliary agent according to a ratio, place them in a mixer, and stir evenly with a stirrer to obtain mixture 1;

[0010] S2. Place mixture 1 in a closed container, fill it with liquid ammonia, increase the pressure to 8 - 12 MPa, maintain the pressure for 15 - 25 min, then instantaneously release the pressure, and remove the liquid ammonia until the pressure in the closed container drops to 133 Pa to obtain the crystal-transformed modified polypropylene;

[0011] S3. Add the modified polypropylene obtained in step S2 to a twin-screw extruder, melt and extrude it into pellets, and then dry the pellets through a dryer to obtain spinning raw materials;

[0012] S4. After cooling, drawing, crimping, oiling, heat setting, cutting, and packing the spinning raw materials obtained in step S3, the modified polypropylene fiber with high heat resistance can be obtained.

[0013] Further, in step S2, the liquid ammonia is removed by an evaporation method using heating and vacuum pumping by a vacuum pump in parallel.

[0014] Further, the rotation speed of the twin-screw extruder in step S3 is 800 - 1000 r / min.

[0015] Further, the set temperature of the dryer in step S3 is 100 - 120 °C, and the drying time is 3 - 6 h.

[0016] The mixture 1 is placed in a closed container and filled with liquid ammonia to increase the pressure. Polypropylene and polypropylene resin are mixed to produce polypropylene fiber. The modification of polypropylene fiber crystal transformation is achieved during the process of instantaneously releasing the pressure under high pressure. When the high pressure is instantaneously released, the energy state and molecular arrangement inside the polypropylene fiber change, inducing the change of crystal structure. This crystal transformation enables the polypropylene fiber to obtain a more stable crystal structure and improves its heat resistance. At the same time, under high pressure, liquid ammonia will penetrate between the polypropylene fiber molecules, causing the polypropylene fiber molecules to swell and the pores to become larger, so that acrylic acid can enter the interior of the fiber, and then there is a larger contact area. Under the action of an initiator, a graft reaction occurs between acrylic acid and polypropylene fiber, introducing more carboxyl groups. Carboxyl groups are polar groups, and hydrogen bonds will be generated between polar groups. The interaction of hydrogen bonds can, to a certain extent, resist the destruction of the molecular chain by thermal motion, that is, it can provide additional stable energy for the polypropylene fiber, help maintain the structure and performance of the material, and improve its heat resistance. In addition, during the grafting process, acrylic acid will also form a cross-linked network on the surface of the polypropylene fiber. These cross-linking points will limit the movement of polymer chain segments, making the molecular chain of the polypropylene fiber not easy to slide and deform when heated. When the temperature rises, the cross-linked structure can maintain the integrity of the material, thus improving the thermal stability and heat resistance of the polypropylene fiber; the grafting of acrylic acid will affect the original crystalline structure of the polypropylene fiber. On the one hand, the grafted acrylic acid may interfere with the regular arrangement of the polypropylene molecular chain, reducing the crystallinity to a certain extent. On the other hand, it will also induce the formation of a new crystalline form or make the crystal size smaller and more evenly distributed. This changed crystalline structure is more stable at high temperatures and can withstand higher temperatures without obvious thermal shrinkage or melting, thus improving the heat resistance.

[0017] A production process of a low-energy consumption ribbon trademark material includes the following steps:

[0018] (1) Weaving: Using polypropylene yarn made of modified polypropylene fiber to weave polypropylene fabric, with satin or plain weave, a density of 100 - 120 g / m2, the filament fineness of warp and weft directions is 50 - 100 D * 50 - 100 D, the warp and weft density is 70 - 140 pieces / cm * 30 - 50 pieces / cm, and it is produced by a water-jet or air-jet loom;

[0019] (2) Cold pad-batch pretreatment: The polypropylene fabric enters the cold pad-batch padding machine in a flat width manner, is impregnated with the cold pad-batch treatment liquid, the vehicle speed is 10 - 30 m / min, the temperature is 20 - 30 °C, the nip pressure of the calender is 0.30 - 0.40 Mpa, the pressure of the loose-tension frame is 0.35 - 0.45 Mpa. After impregnating and padding the cold pad-batch treatment liquid, the fabric is covered with a film on the outer layer in a rolled form, and the reel rotates at a speed of 10 - 50 rpm, and is placed at room temperature for 6 - 24 h;

[0020] (3) Desizing treatment: The pre-treated polypropylene fabric is introduced into a continuous desizing and scouring machine in a large roll form for desizing. The machine speed is 50 - 100 m / min. The desizing and scouring machine contains two troughs, five water washing tanks, and a set of drying cylinders. The two troughs are connected and filled with desizing treatment liquid. The temperature of the troughs is set at 50 - 90 °C. The temperatures of the five water washing tanks are set at 95 / 95 / 90 / 80 / 60 °C respectively, and clean water is injected into the last water washing tank. The water flow rate is 1.5 t / h - 2.5 t / h, and the water flows countercurrently to the first water washing tank and is discharged.

[0021] (4) Stentering and calendering treatment: The stentering equipment uses a 9-section high-efficiency stentering machine. The stentering temperature is 120 - 160 °C, the machine speed is 50 - 90 m / min, and the stentering width is reduced by about 5 compared to the width of the scoured fabric. A high-pressure eight-roll calender is used. The machine speed is 10 - 40 m / min, the pressure is 5 - 8 mPa, and the machine speed is 10 - 40 m / min. Constant-tension unwinding is used for unwinding.

[0022] Further, in step (1), the specification of the polypropylene yarn is one of 50D, 68D, 75D, 100D, and 150D.

[0023] Further, in step (2), the components of the cold pad-batch treatment liquid are 25 - 45 g / L of soda ash, 0.5% - 2% (by weight of the fabric) of dioctyl adipate (DOA), and 0.5 - 2 g / L of sodium dodecylbenzenesulfonate (LAS).

[0024] Further, in step (3), the components of the desizing treatment liquid are 2 - 8 g / L of dibutyl sebacate (DBS), 8 - 10 g / L of NaOH, 2 - 5 g / L of desizing aid, and 2 - 5 g / L of chelating dispersant.

[0025] Further, the desizing aid is one or more of penetrant, wetting agent, detergent, and scouring agent, and the chelating dispersant is one or more of sodium gluconate, ethylenediamine di(o-hydroxyphenyl) acetic acid sodium salt, and hydroxyethylidene diphosphonic acid.

[0026] The soda ash in the cold pad-batch treatment liquid can react with the acidic impurities that may exist on the fabric and helps to remove the subsequent sizing agents. Sodium dodecyl benzene sulfonate (LAS), as a surfactant, reduces the surface tension between the fabric and the treatment liquid, enabling the treatment liquid to better penetrate into the interior of the fabric and promoting subsequent reactions. Dioctyl adipate (DOA), as a plasticizer, can penetrate into the interior of polypropylene fibers, reduce the intermolecular force, improve the fiber flexibility and thermal shrinkage rate. Cold pad-batch treatment can optimize the properties of polypropylene fibers. The fabric is relatively "clean", and the components in the treatment liquid can better act on the fibers. The bite force between the fibers will be enhanced due to the removal of impurities and the optimization of the fiber structure, thereby improving the strength and dimensional stability of the fabric and reducing problems such as deformation and rupture that occur during subsequent processing or use. The NaOH in the desizing treatment liquid can undergo saponification and hydrolysis reactions with functional groups such as esters and carboxyl groups in the sizing agent at a higher temperature, destroying the sizing agent structure. Dibutyl sebacate (DBS) further exerts a plasticizing effect at high temperature, interacts with polypropylene molecules, realizes sufficient pre-shrinking, achieves the effect of dimensional stability, and makes the fibers softer while increasing the thermal shrinkage rate.

[0027] The beneficial effects of the present invention are as follows:

[0028] The present invention provides a production process for a low-energy consumption ribbon trademark material. By placing polypropylene, polypropylene resin, acrylic acid, initiator and additives in a closed container, filling it with liquid ammonia to form high pressure, and then instantaneously releasing the pressure to obtain crystal-varied modified polypropylene, the introduced modified polypropylene yarn is used to greatly reduce the thermal shrinkage rate of the polypropylene fabric and improve the temperature resistance. Then, through cold pad-batch desizing treatment of the polypropylene fabric, the thermal shrinkage rate of the polypropylene fabric is further reduced, sufficient pre-shrinking is achieved, and the effect of dimensional stability is obtained, enabling polypropylene to be used as a trademark material. Specific embodiments

[0029] The following further illustrates the present invention with reference to embodiments, but does not limit the present invention thereto. The experimental methods in the following embodiments are all conventional methods unless otherwise specified.

[0030] Embodiment 1

[0031] A modified polypropylene fiber with high temperature resistance is composed of the following components in parts by weight: 30 parts of polypropylene, 20 parts of polypropylene resin, 10 parts of acrylic acid, 1 part of initiator and 5 parts of additives. The additive is an antioxidant, and the initiator is azobisisobutyronitrile (AIBN).

[0032] A preparation method of a modified polypropylene fiber with high temperature resistance includes the following steps:

[0033] S1. Weigh and place polypropylene, polypropylene resin, acrylic acid, initiator and additives into a mixer, mix them evenly with a stirrer to obtain mixture 1;

[0034] S2. Place the mixture 1 in a closed container, fill it with liquid ammonia, increase the pressure to 8 MPa, maintain the pressure for 15 min, and then instantaneously release the pressure. Remove the liquid ammonia by the evaporation method with heating and vacuum pumping by a vacuum pump until the pressure in the closed container drops to 133 Pa, thus obtaining the crystal transformation modified polypropylene fiber.

[0035] S3. Add the modified polypropylene fiber obtained in step S2 to a twin-screw extruder for melt extrusion and pelletizing to obtain the required pellets. The rotational speed of the twin-screw extruder is 800 r / min. The pellets are then dried in a dryer at 100 °C for 3 h to obtain the spinning raw material.

[0036] S4. After cooling, drawing, crimping, oiling, heat setting, cutting, and packing the spinning raw material obtained in step S3, the modified polypropylene fiber with high temperature resistance can be obtained.

[0037] A production process of a low-energy consumption ribbon trademark material includes the following steps:

[0038] (1) Weaving: Weave a polypropylene fabric with polypropylene yarns made of modified polypropylene fibers. The specification of the polypropylene yarns is 50 D, with a twill or plain weave, a density of 100 g / m2, a filament fineness of 50 D * 50 D in the warp and weft directions, and a warp and weft density of 70 roots / cm * 30 roots / cm. It is produced by a water-jet or air-jet loom.

[0039] (2) Cold pad-batch pretreatment: The polypropylene fabric enters a cold pad-batch padding machine in a flat width manner, is impregnated with a cold pad-batch treatment liquid. The vehicle speed is 10 m / min, the temperature is 20 °C, the nip pressure of the rolling mill is 0.30 Mpa, and the pressure of the loose-tight frame is 0.35 Mpa. After impregnating and cold pad-batching the treatment liquid, the composition of the cold pad-batch treatment liquid is 25 g / L soda ash, 0.5% dioctyl adipate (DOA) by weight of the fabric, and 0.5 g / L sodium dodecyl benzene sulfonate (LAS). The fabric is covered with a film on the outer layer in a roll shape, and the reel rotates at a speed of 10 rpm and is placed at room temperature for 6 h.

[0040] (3) Desizing treatment: Introduce the pretreated polypropylene fabric in a large roll into a continuous desizing and scouring machine for desizing. The vehicle speed is 50 m / min. The desizing and scouring machine contains two troughs, 5 water washing troughs, and 1 group of drying cylinders. The two troughs are connected and are added with a desizing treatment liquid. The temperature of the troughs is set at 50 °C. The temperatures of the 5 water washing troughs are respectively set at 95 / 95 / 90 / 80 / 60 °C, and clean water is injected into the last water washing trough. The water flow rate is 1.5 t / h, and the water flows countercurrently to the first water washing trough and is discharged.

[0041] (4) Setting and calendering treatment: The setting equipment uses a 9-section high-efficiency setting machine, with a setting temperature of 120 °C, a vehicle speed of 50 m / min, and the setting width is reduced by about 5 compared to the width of the refined fabric. A high-pressure eight-roll calender is used, with a vehicle speed of 10 m / min, a pressure of 5 mPa, and a vehicle speed of 10 m / min. Constant-tension unwinding is used for unwinding.

[0042] Example 2

[0043] A modified polypropylene fiber with high heat resistance is composed of the following components in parts by weight: 50 parts of polypropylene, 45 parts of polypropylene resin, 25 parts of acrylic acid, 5 parts of initiator, and 10 parts of auxiliary agent. The auxiliary agent is a light stabilizer, and the initiator is azobisisobutyronitrile (AIBN).

[0044] A preparation method of a modified polypropylene fiber with high heat resistance includes the following steps:

[0045] S1. Mix and proportion polypropylene, polypropylene resin, acrylic acid, initiator, and auxiliary agent, place them in a mixer and stir evenly with a stirrer to obtain mixture 1;

[0046] S2. Place mixture 1 in a closed container, fill it with liquid ammonia, increase the pressure to 12 MPa, keep the pressure for 25 min, then instantaneously release the pressure, and remove the liquid ammonia by the evaporation method of heating and vacuum pumping with a vacuum pump until the pressure in the closed container drops to 133 Pa, thus obtaining the crystal-transformed modified polypropylene;

[0047] S3. Add the modified polypropylene in step S2 to a twin-screw extruder for melt extrusion and granulation to obtain the required particles. The rotational speed of the twin-screw extruder is 1000 r / min, and the particles are then dried in a dryer at 120 °C for 3 - 6 h to obtain the spinning raw material;

[0048] S4. After cooling, drawing, crimping, oiling, heat setting, cutting, and packing the spinning raw material obtained in step S3, the modified polypropylene fiber with high heat resistance can be obtained.

[0049] A production process of a low-energy-consuming ribbon trademark material includes the following steps:

[0050] (1) Weaving: Weave a polypropylene fabric with polypropylene yarn made of modified polypropylene fiber. The specification of the polypropylene yarn is 75D, with a satin or plain weave, a fabric density of 120 g / m2, the filament fineness in the warp and weft directions is 100D*100D, and the warp and weft densities are 140 roots / cm * 50 roots / cm. It is produced by a water-jet or air-jet loom;

[0051] (2) Cold pad-batch pretreatment: The polypropylene fabric enters the cold pad-batch padding machine in a flat width manner, is impregnated with the cold pad-batch treatment liquid, the vehicle speed is 30 m / min, the temperature is 30 °C, the nip pressure of the rolling mill is 0.40 Mpa, the pressure of the loose-tension frame is 0.45 Mpa. After impregnating the cold pad-batch treatment liquid, the composition of the cold pad-batch treatment liquid is 45 g / L soda ash, 2% dioctyl adipate (DOA) by weight of the fabric weight, 2 g / L sodium dodecyl benzene sulfonate (LAS). The fabric is laminated on the outer layer in a roll form, and the reel rotates at a speed of 50 rpm and is placed at room temperature for 24 h;

[0052] (3) Desizing treatment: The pretreated polypropylene fabric is introduced into a continuous desizing and scouring machine in a large roll form for desizing. The vehicle speed is 100 m / min. The desizing and scouring machine contains two material tanks, 5 water washing tanks, and 1 group of drying cylinders. The two material tanks are connected and filled with the desizing treatment liquid. The temperature of the material tank is set at 90 °C, the temperatures of the 5 water washing tanks are 95 / 95 / 90 / 80 / 60 °C respectively, and clean water is injected into the last water washing tank, and the water flow rate is 2.5 t / h. The water flows countercurrently to the first water washing tank and is discharged;

[0053] (4) Setting and calendering treatment: The setting equipment uses a 9-section high-efficiency setting machine, the setting temperature is 160 °C, the vehicle speed is 90 m / min, the setting width is about 5 less than the width of the scoured fabric. A high-pressure eight-roll calender is used, the vehicle speed is 40 m / min, the pressure is 8 mPa, the vehicle speed is 40 m / min, and constant-tension unwinding is used for unwinding.

[0054] Example 3

[0055] A modified polypropylene fiber with high heat resistance is composed of the following components in parts by weight: 40 parts of polypropylene, 32.5 parts of polypropylene resin, 17.5 parts of acrylic acid, 3 parts of initiator, and 7.5 parts of auxiliary agent. The auxiliary agent is a heat stabilizer, and the initiator is azobisisobutyronitrile (AIBN).

[0056] A preparation method of a modified polypropylene fiber with high heat resistance includes the following steps:

[0057] S1. Mix and proportion polypropylene, polypropylene resin, acrylic acid, initiator, and auxiliary agent and place them in a mixer, and stir evenly with a stirrer to obtain mixture 1;

[0058] S2. Place mixture 1 in a closed container, fill it with liquid ammonia, increase the pressure to 10 MPa, keep the pressure for 20 min, and then instantaneously release the pressure. Remove the liquid ammonia by the evaporation method of heating and vacuum pumping by a vacuum pump until the pressure in the closed container drops to 133 Pa, and then a crystal-transformed modified polypropylene is obtained;

[0059] S3. Add the modified polypropylene from step S2 into a twin-screw extruder for melt extrusion and pelletization to obtain the required pellets. The rotational speed of the twin-screw extruder is 900 r / min. The pellets are then dried in a dryer at 110 °C for 5 h to obtain the spinning raw material.

[0060] S4. After cooling, drawing, crimping, oiling, heat setting, cutting, and packing the spinning raw material obtained in step S3, the modified polypropylene fiber with high temperature resistance can be obtained.

[0061] A production process of a low-energy consumption ribbon trademark material includes the following steps:

[0062] (1) Weaving: Weave a polypropylene fabric with polypropylene yarn made of modified polypropylene fiber. The specification of the polypropylene yarn is 100D, with a satin or plain weave, a density of 110 g / m2, a filament fineness of 75D*75D in the warp and weft directions, and a warp and weft density of 50 roots / cm * 40 roots / cm. It is produced by a water-jet or air-jet loom.

[0063] (2) Cold pad-batch pretreatment: The polypropylene fabric enters the cold pad-batch machine in a flat form, is impregnated with the cold pad-batch treatment liquid. The vehicle speed is 20 m / min, the temperature is 25 °C, the nip roll pressure is 0.35 Mpa, and the tenter frame pressure is 0.40 Mpa. After impregnating and cold pad-batching the treatment liquid, the composition of the cold pad-batch treatment liquid is 35 g / L soda ash, 1.25% dioctyl adipate (DOA) by weight of the fabric, and 1.25 g / L sodium dodecyl benzene sulfonate (LAS). The fabric is laminated on the outer layer in a roll form, and the reel rotates at a speed of 225 rpm and is placed at room temperature for 9 h.

[0064] (3) Desizing treatment: The pretreated polypropylene fabric is introduced into a continuous desizing and scouring machine in a large roll for desizing. The vehicle speed is 75 m / min. The desizing and scouring machine contains two troughs, 5 water washing troughs, and 1 group of drying cylinders. The two troughs are connected and filled with the desizing treatment liquid. The temperature of the trough is set at 70 °C. The temperatures of the 5 water washing troughs are set at 95 / 95 / 90 / 80 / 60 °C respectively, and clean water is injected into the last water washing trough. The water flow rate is 2.0 t / h, and the water flows countercurrently to the first water washing trough and is discharged.

[0065] (4) Setting and calendering treatment: The setting equipment uses a 9-section high-efficiency setting machine, and the setting temperature is 140 °C; the vehicle speed is 70 m / min, and the setting width is about 5 less than the width of the scoured fabric. A high-pressure eight-roll calender is used, the vehicle speed is 25 m / min, the pressure is 6.5 mPa, the vehicle speed is 25 m / min, and constant-tension unwinding is used for unwinding.

[0066] Comparative example 1: This comparative example 1 is basically the same as Example 3, except that there is no acrylic acid in step S1 of the polypropylene fiber modification process.

[0067] Comparative Example 2: This Comparative Example 2 is basically the same as Example 3, except that step S2 is not included in the modification process of the polypropylene fiber.

[0068] Comparative Example 3: This Comparative Example 2 is basically the same as Example 3, except that step (2) cold pad-batch pretreatment is not included in the production process of the low-energy consumption ribbon trademark material.

[0069] Comparative Example 4: This Comparative Example 2 is basically the same as Example 3, except that (3) desizing treatment is not included in the production process of the low-energy consumption ribbon trademark material.

[0070] Test experiment:

[0071] Seven samples of Examples 1 - 3 and Comparative Examples 1 - 4 were used as test samples for testing, and the test results are shown in Table 1.

[0072] Table 1 Test results of thermal shrinkage rate

[0073]

[0074] It can be seen from the comparison between the examples and the comparative examples that the thermal shrinkage rates of the examples are 0.01 and 0 respectively, which indicates that the samples of the examples have a very low degree of thermal shrinkage under the test conditions, perform excellently in terms of thermal stability, and can maintain good dimensional stability when heated. Moreover, the examples are significantly superior to the comparative examples in terms of thermal shrinkage rate. In Comparative Example 1, acrylic acid was not added during the modification of polypropylene, so no carboxyl group was introduced. In Comparative Example 2, the crystal form of polypropylene was not changed by the step of high pressure and then instantaneously releasing the pressure during the modification of polypropylene. In Comparative Example 3, step (2) cold pad-batch pretreatment was not included in the production process of the low-energy consumption ribbon trademark material. In Comparative Example 4, (3) desizing treatment was not included in the production process of the low-energy consumption ribbon trademark material. Therefore, the thermal shrinkage rates of the comparative examples are all higher than those of the examples.

[0075] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A production process for low-energy consumption ribbon trademark material, characterized in that: The method comprises the following steps: (1) weaving: using polypropylene yarn made of modified polypropylene fiber to weave polypropylene fabric, with satin or plain weave, density of 100-120 g / m2, filament fineness of 50-100 D*50-100 D in warp and weft directions, warp and weft density of 70-140 strands / cm*30-50 strands / cm, and using water jet or air jet loom for production; (2) cold stacking pretreatment: the polypropylene fabric enters the cold stacking liquid coating machine in an open width manner, and is immersed in the cold stacking treatment liquid, and the machine speed is 10-30 m / m in, the temperature is 20-30℃, the pressure of the padding machine is 0.30-0.40Mpa, the pressure of the tension frame is 0.35-0.45Mpa, after being dipped in the cold pile treatment solution, the fabric is coated with an outer layer in a roll form, the reel rotates at a speed of 10-50rpm, and is placed at room temperature for 6-24h; (3) Desizing treatment: the pretreated polypropylene fabric is introduced into a continuous desizing refiner in a large roll form for desizing, the speed is 50-100m / min, and the desizing refiner contains two materials trough, 5 washing troughs, 1 set of drying cylinders, two material troughs are connected and filled with desizing liquid, the material trough temperature is set at 50-90°C, the 5 washing trough temperatures are set at 95 / 95 / 90 / 80 / 60°C respectively, and clean water is injected into the last washing trough, the water flow rate is 1.5t / h-2.5t / h, and the water flows back to the first washing trough for discharge; (4) Forming and calendering treatment: the forming equipment adopts 9-section high-efficiency forming machines, the forming temperature is 120-160°C, and the speed is 50-90m / min , the width of the shaped cloth is about 5 less than that of the refined cloth; a high-pressure eight-roll calender is used, the speed is 10-40m / min, the pressure is 5-8mPa, the speed is 10-40m / min, and the unwinding adopts constant tension unwinding; the specification of the polypropylene yarn in step (1) is one of 50D, 68D, 75D, 100D, and 150D; the composition of the cold stack treatment liquid in step (2) is 25-45g / L soda ash, 0.5%-2% of the weight of the fabric dioctyl adipate, 0.5-2 g / L sodium dodecylbenzene sulfonate; the desizing treatment liquid in step (3) comprises 2-8 g / L dibutyl decanoate, 8-10 g / L NaOH, 2-5 g / L desizing aid, and 2-5 g / L chelating dispersant; the modified polypropylene fiber is composed of the following components in parts by weight: 30-50 parts of polypropylene, 20-45 parts of polypropylene resin, 10-25 parts of acrylic acid, 1-5 parts of initiator, and 5-10 parts of auxiliary agent; the preparation method of the modified polypropylene fiber comprises the following steps: S1, mixing polypropylene, polypropylene resin, acrylic acid, initiator and auxiliary agent in a mixer and mixing them with a stirrer to obtain a mixture 1; S2, placing the mixture 1 in a closed In the container, liquid ammonia is filled, the pressure is increased to 8-12MPa, the pressure is maintained for 15-25 minutes, and then the pressure is released instantly, and the liquid ammonia is removed until the pressure in the closed container drops to 133Pa, and the crystal-modified polypropylene fiber is obtained; S3, the modified polypropylene fiber in step S2 is added to a twin-screw extruder for melt extrusion and granulation to obtain the required particles, and the particles are then dried in a dryer to obtain spinning raw materials; S4, the spinning raw materials obtained in step S3 are cooled, stretched, curled, oiled, heat-set, cut, and packaged to obtain highly heat-resistant modified polypropylene fibers. .

2. The production process of a low-energy consumption ribbon trademark material according to claim 1, characterized in that: The desizing aid is one or more of a penetrant, a wetting agent, a detergent, and a refining agent, and the chelating dispersant is one or more of sodium gluconate, sodium ethylenediamine di-o-hydroxyphenyl acetate, and hydroxyethylidene diphosphonic acid.

3. The production process of a low-energy consumption ribbon trademark material according to claim 1, characterized in that: The auxiliary agent is at least one of an antioxidant, a light stabilizer, a heat stabilizer, a colorant, or an inorganic filler, and the initiator is azobisisobutyronitrile.

4. The production process of a low-energy consumption ribbon trademark material according to claim 1, characterized in that: In step S2, liquid ammonia is removed by an evaporation method combining heating and vacuum pumping in parallel; in step S3, the speed of the twin-screw extruder is 800-1000 r / min; in step S3, the set temperature of the dryer is 100-120° C., and the drying time is 3-6 hours.

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