Preparation method of multifunctional knitted fabric

Abstract

The invention provides a preparation method of a multifunctional knitted fabric. Comprising the following steps: S1, adding graphene and a functional filler into high-density polyethylene powder, and mixing and stirring to obtain mixed powder; carrying out melt blending on the mixed powder, and carrying out extrusion granulation to obtain modified graphene polyethylene composite master batch; s2, the modified graphene polyethylene composite master batch and polyethylene slices are mixed and subjected to melt spinning, nascent fibers are obtained, and the polyethylene slices comprise low-density polyethylene slices and high-density polyethylene slices; the nascent fiber is sequentially subjected to winding, stretching and heat setting, and the graphene polyethylene fiber is obtained; s3, weaving the graphene polyethylene fibers to obtain the multifunctional knitted fabric. By adopting the high-density polyethylene and graphene materials, the obtained fabric not only has excellent softness and mechanical property, but also has antistatic property, air permeability and flame retardant property, and can meet different use scenes.

Description

Technical Field

[0001] The invention relates to the technical field of composite fibers and knitted fabrics, and in particular to a method for preparing a multifunctional knitted fabric. Background Art

[0002] In today's society, the impact of static electricity on human life and industrial production has gradually received attention. The accumulation of static electricity not only causes inconvenience in daily life, such as clothes absorbing dust and discomfort, but also brings serious safety hazards in specific industrial environments. Especially in the electronics industry, static interference may cause the accuracy of products to decrease; in flammable and explosive places such as the petrochemical industry, static discharge may cause explosions or fire accidents. Therefore, scientific research institutions and enterprises in various countries are actively exploring effective anti-static technologies.

[0003] The methods currently used to improve the antistatic properties of fibers are mainly as follows:

[0004] 1) Loading anionic, cationic or nonionic surfactants on the fiber surface, however, this method has poor durability and the surfactants are easily shed during washing, thus losing the antistatic effect;

[0005] 2) Integrating conductive resin into the fiber can improve the antistatic performance, but it may affect the physical properties of the fiber;

[0006] 3) Adding materials with low resistivity to the fiber can improve the antistatic performance, but the stability is insufficient.

[0007] The existing technologies, while improving antistatic properties, are often complicated in process, increase in cost, and reduce in flexibility. Therefore, there is an urgent need for a method for preparing a knitted fabric that is breathable, soft, and antistatic. Summary of the invention

[0008] 1. Technical issues to be resolved

[0009] In view of the shortcomings of the prior art, the present invention provides a method for preparing a multifunctional knitted fabric. By melt-spinning high-density polyethylene and graphene, not only the flexibility of the polyethylene fiber can be maintained, but also the prepared fiber has antistatic properties, thereby solving the problems raised in the above-mentioned background technology.

[0010] (II) Technical solution

[0011] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0012] According to a first aspect of the present invention, there is provided a method for preparing a multifunctional knitted fabric, comprising the following steps:

[0013] S1, adding graphene and functional fillers to high-density polyethylene powder, mixing and stirring to obtain a mixed powder; then extruding and granulating the mixed powder after melt blending to obtain a modified graphene polyethylene composite masterbatch;

[0014] S2, mixing the modified graphene polyethylene composite masterbatch with polyethylene chips, and melt spinning to obtain spun fibers, wherein the polyethylene chips include low-density polyethylene chips and high-density polyethylene chips; winding, stretching, and heat-setting the spun fibers in sequence to obtain graphene polyethylene fibers;

[0015] S3. Weaving the graphene polyethylene fibers to obtain a multifunctional knitted fabric.

[0016] In the present invention, the weaving method used in step S3 is selected from at least one of plain weave, twill weave, satin weave or thread weave.

[0017] Preferably, in step S1, by mass fraction, the mass fraction of the high-density polyethylene powder in the mixed powder is greater than or equal to 85%, the mass fraction of the graphene in the mixed powder is less than 13%, and the mass fraction of the functional filler in the mixed powder is less than 5%.

[0018] Preferably, in step S1, by mass fraction, the mass fraction of the high-density polyethylene powder in the mixed powder is greater than or equal to 93%, the mass fraction of the graphene in the mixed powder is less than 6%, and the mass fraction of the functional filler in the mixed powder is less than 2%.

[0019] Further preferably, in step S1, by mass fraction, the mass fraction of the high-density polyethylene powder in the mixed powder is 93-97.5%, the mass fraction of the graphene in the mixed powder is 1-5.5%, and the mass fraction of the functional filler in the mixed powder is 0.5-1.5%.

[0020] The invention optimizes the addition amounts of high-density polyethylene, graphene and functional fillers, thereby not only improving the mechanical properties of the polyethylene fiber, but also having excellent flexibility, antistatic properties and flame retardancy.

[0021] Preferably, in step S1, the molecular weight of the high-density polyethylene powder is 400,000 to 500,000;

[0022] The functional filler comprises a fluorine-containing waterproof agent, organic silicon and a halogen-free flame retardant, and the mass ratio of the fluorine-containing waterproof agent, organic silicon and the halogen-free flame retardant is 1:1:1.

[0023] Specifically, the fluorine-containing waterproofing agent is selected from C8 fluorine waterproofing agent or C6 fluorine waterproofing agent; the organosilicon is selected from at least one of polydimethylsiloxane, terminal hydroxyl polydimethylsiloxane, and quaternary ammonium salt modified organosilicon; the halogen-free flame retardant is selected from at least one of aluminum hydroxide, magnesium hydroxide, microencapsulated red phosphorus, diethyl aluminum phosphinate, and melamine polyphosphate, wherein the coating substrate of the microencapsulated red phosphorus is an inorganic compound and an organic resin, and the red phosphorus content is ≥80%.

[0024] Preferably, in step S1, the extrusion granulation after melt blending adopts a twin-screw extruder, the temperature of the twin-screw extruder is 180-200° C., and the rotation speed of the twin-screw extruder is 30-50 rpm.

[0025] Preferably, in step S2, the mass ratio of the modified graphene polyethylene composite masterbatch to the polyethylene chips is 1:0.5-0.8;

[0026] The molecular weight of the low-density polyethylene slice is 100,000 to 300,000, and the molecular weight of the high-density polyethylene slice is 400,000 to 500,000;

[0027] The mass ratio of the low-density polyethylene slices to the high-density polyethylene slices is 1:2-4.

[0028] Since high-density polyethylene powder has poor fluidity during the melting process, adding a small amount of low-density polyethylene during the melt spinning process can improve the fluidity of the melt spinning process and improve the surface smoothness and mechanical properties of the spinning.

[0029] Preferably, in step S2, an auxiliary agent is also added during the mixing process of the modified graphene polyethylene composite masterbatch and the polyethylene chips, and the auxiliary agent includes polyisobutylene and styrene-butadiene rubber.

[0030] Preferably, the additive is added in an amount of 5-10% of the polyethylene chips.

[0031] Preferably, in step S2, the process parameters of the melt spinning are: the temperature of the feed section is 130-180°C, the temperature of the melting zone is 200-240°C, the temperature of the metering pump is 210-220°C, the temperature of the spinning box is 200-240°C, and the nozzle stretching multiple is 80-120 times.

[0032] Preferably, in step S2, the winding speed is 500-700 m / min;

[0033] The stretching multiple is 5 to 8 times, and the temperature is 60 to 80°C;

[0034] The temperature of the heat setting is 100-150° C., and the time is 30 seconds-3 minutes.

[0035] (III) Beneficial effects

[0036] The present invention provides a method for preparing a multifunctional knitted fabric, which has the following beneficial effects:

[0037] (1) This scheme provides a method for preparing a multifunctional knitted fabric, which uses high-density polyethylene and graphene materials. The resulting fabric not only has excellent softness and mechanical properties, but also has antistatic properties.

[0038] (2) This scheme provides a method for preparing a multifunctional knitted fabric. The added functional filler works synergistically with graphene, so that the prepared knitted fabric also has flame retardant and cut-resistant properties, so that the obtained knitted fabric has multiple functions at the same time and can meet different usage scenarios. DETAILED DESCRIPTION

[0039] In order to better illustrate the content of the present invention, a detailed description is given below in conjunction with specific embodiments.

[0040] Example 1

[0041] A method for preparing a multifunctional knitted fabric comprises the following steps:

[0042] Step 1, taking 85kg of high-density polyethylene powder with a molecular weight of 400,000, 12kg of graphene and 3kg of functional filler and mixing them thoroughly to obtain a mixed powder, wherein the functional filler includes 1kg of C8 fluorine waterproofing agent, 1kg of polydimethylsiloxane and 1kg of aluminum hydroxide, and then extruding the mixed powder through a twin-screw extruder, controlling the temperature of the twin-screw extruder to 190°C and the speed to 30rpm, to obtain a modified graphene polyethylene composite masterbatch;

[0043] Step 2, the modified graphene polyethylene composite masterbatch obtained in step 1, 50 kg of high-density polyethylene chips with a molecular weight of 400,000, 15 kg of low-density polyethylene chips with a molecular weight of 120,000, and 3.25 kg of a mixture of polyisobutylene and styrene-butadiene rubber are introduced into the hopper of a multi-stage spinning device, the temperature of the feed section is set to 150° C., the temperature of the melting zone is set to 220° C., the temperature of the metering pump is set to 210° C., the temperature of the spinning box is set to 220° C., and the nozzle stretching multiple is set to 100 times to obtain nascent fibers;

[0044] Step 3, winding, stretching and heat-setting the spun fiber obtained in step 2 in sequence to obtain graphene polyethylene fiber, wherein the winding speed is 600 m / min, the stretching multiple is 5 times, the temperature is 60° C., the heat-setting temperature is 150° C., and the time is 30 s;

[0045] Step 4: The graphene polyethylene fiber obtained in step 3 is plain woven to obtain a multifunctional knitted fabric.

[0046] Example 2

[0047] A method for preparing a multifunctional knitted fabric is the same as the preparation method of Example 1, except that: step 1, taking 93kg of high-density polyethylene powder with a molecular weight of 400,000, 5.5kg of graphene and 1.5kg of functional filler and fully mixing them to obtain a mixed powder, wherein the functional filler includes 0.5kg of C8 fluoro waterproofing agent, 0.5kg of polydimethylsiloxane and 0.5kg of aluminum hydroxide, and then extruding the mixed powder through a twin-screw extruder, controlling the temperature of the twin-screw extruder to 190°C and the rotation speed to 30rpm, to obtain a modified graphene polyethylene composite masterbatch.

[0048] Example 3

[0049] A method for preparing a multifunctional knitted fabric is the same as the preparation method of Example 1, except that: step 1, taking 94.8.2 kg of high-density polyethylene powder with a molecular weight of 400,000, 4 kg of graphene and 1.2 kg of functional filler, and fully mixing them to obtain a mixed powder, wherein the functional filler includes 0.5 kg of C8 fluoro waterproofing agent, 0.5 kg of polydimethylsiloxane and 0.5 kg of aluminum hydroxide, and then extruding the mixed powder through a twin-screw extruder, controlling the temperature of the twin-screw extruder to 190° C. and the rotation speed to 30 rpm, to obtain a modified graphene polyethylene composite masterbatch.

[0050] Example 4

[0051] A method for preparing a multifunctional knitted fabric is the same as the method for preparing the fabric in Example 1, except that the auxiliary agents polyisobutylene and styrene-butadiene rubber are not added in step 2.

[0052] Example 5

[0053] A method for preparing a multifunctional knitted fabric comprises the following steps:

[0054] Step 1, taking 85kg of high-density polyethylene powder with a molecular weight of 400,000, 12kg of graphene and 3kg of functional filler and mixing them thoroughly to obtain a mixed powder, wherein the functional filler includes 1kg of C8 fluorine waterproofing agent, 1kg of polydimethylsiloxane and 1kg of aluminum hydroxide, and then extruding the mixed powder through a twin-screw extruder, controlling the temperature of the twin-screw extruder to 190°C and the speed to 30rpm, to obtain a modified graphene polyethylene composite masterbatch;

[0055] Step 2, the modified graphene polyethylene composite masterbatch obtained in step 1, 65 kg of high-density polyethylene chips with a molecular weight of 400,000 and 3.25 kg of a mixture of polyisobutylene and styrene-butadiene rubber are introduced into the hopper of a multi-stage spinning device, the temperature of the feed section is set to 150° C., the temperature of the melting zone is set to 220° C., the temperature of the metering pump is set to 210° C., the temperature of the spinning box is set to 220° C., and the nozzle stretching multiple is set to 100 times to obtain nascent fibers;

[0056] Step 3, winding, stretching and heat-setting the spun fiber obtained in step 2 in sequence to obtain graphene polyethylene fiber, wherein the winding speed is 600 m / min, the stretching multiple is 5 times, the temperature is 60° C., the heat-setting temperature is 150° C., and the time is 30 s;

[0057] Step 4: The graphene polyethylene fiber obtained in step 3 is plain woven to obtain a multifunctional knitted fabric.

[0058] Example 6

[0059] A method for preparing a multifunctional knitted fabric is the same as the method for preparing the fabric in Example 4, except that in step 2, 65 kg of low-density polyethylene chips with a molecular weight of 120,000 are added.

[0060] Example 7

[0061] A method for preparing a multifunctional knitted fabric is the same as the preparation method of Example 1, except that: in step 2, the temperature of the feed section of the multi-stage spinning equipment is 180°C, the temperature of the melting zone is 240°C, the temperature of the metering pump is 220°C, the temperature of the spinning box is 240°C, and the nozzle stretching multiple is 120 times.

[0062] Example 8

[0063] A method for preparing a multifunctional knitted fabric is the same as the preparation method of Example 1, except that: in step 2, the temperature of the feed section of the multi-stage spinning equipment is 130°C, the temperature of the melting zone is 200°C, the temperature of the metering pump is 210°C, the temperature of the spinning box is 220°C, and the nozzle stretching multiple is 80 times.

[0064] Comparative Example 1

[0065] The preparation method of this comparative example is the same as that of Example 1, except that 80 kg of high-density polyethylene powder with a molecular weight of 400,000, 14 kg of graphene and 6 kg of functional filler are fully mixed to obtain a mixed powder, wherein the functional filler includes 2 kg of C8 fluoro waterproofing agent, 2 kg of polydimethylsiloxane and 2 kg of aluminum hydroxide, and then the mixed powder is extruded through a twin-screw extruder, and the temperature of the twin-screw extruder is controlled to be 190°C and the rotation speed is 30 rpm to obtain a modified graphene polyethylene composite masterbatch.

[0066] Test Case

[0067] The multifunctional knitted fabrics of Examples 1 to 8 of the present invention and the fabric of Example 1 were tested for performance parameters. The results are shown in Table 1. The antistatic performance of the multifunctional knitted fabric was tested by the surface resistivity method, and the test standard was GB / T12703.42010; the flame retardant test standard was tested according to the requirements of GB17591-2006; the glossiness standard of the fabric was referenced to GB / T 8686-1988; the air permeability of the fabric was referenced to GB / T 24218.15-2008;

[0068] Example Glossiness Surface resistance / Ω Flame retardant grade <![CDATA[Air permeability / mm·s -1 > Example 1 13.5 <![CDATA[10 7 ]]> B 300 Example 2 13.2 <![CDATA[10 8 ]]> A 300 Example 3 12.6 <![CDATA[10 7 ]]> B 300 Example 4 13.0 <![CDATA[10 7 ]]> B 300 Example 5 12.1 <![CDATA[10 7 ]]> B 300 Example 6 12.5 <![CDATA[10 7 ]]> B 300 Example 7 12.8 <![CDATA[10 7 ]]> B 300 Example 8 10.4 <![CDATA[10 7 ]]> B 300 Comparative Example 1 4.6 <![CDATA[10 5 ]]> C 260

[0069] According to the data in Table 1, the multifunctional knitted fabric prepared by the present invention not only has the mechanical properties required for conventional clothing, but also has antistatic and flame retardancy, and can be used for antistatic work clothes in electronics factories. In addition, the multifunctional knitted fabric prepared by the present invention has good flexibility and air permeability, and can also improve wearing comfort.

[0070] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a multifunctional knitted fabric, characterized in that: The following steps are involved: S1, adding graphene and functional fillers to high-density polyethylene powder, mixing and stirring to obtain a mixed powder; then extruding and granulating the mixed powder after melt blending to obtain a modified graphene polyethylene composite masterbatch; S2, mixing the modified graphene polyethylene composite masterbatch with polyethylene chips, and melt spinning to obtain spun fibers, wherein the polyethylene chips include low-density polyethylene chips and high-density polyethylene chips; winding, stretching, and heat-setting the spun fibers in sequence to obtain graphene polyethylene fibers; S3. Weaving the graphene polyethylene fibers to obtain a multifunctional knitted fabric.

2. The method for preparing a multifunctional knitted fabric according to claim 1, characterized in that: In step S1, by mass fraction, the mass fraction of the high-density polyethylene powder in the mixed powder is greater than or equal to 85%, the mass fraction of the graphene in the mixed powder is less than 13%, and the mass fraction of the functional filler in the mixed powder is less than 5%.

3. The method for preparing a multifunctional knitted fabric according to claim 2, characterized in that: In step S1, by mass fraction, the mass fraction of the high-density polyethylene powder in the mixed powder is greater than or equal to 93%, the mass fraction of the graphene in the mixed powder is less than 6%, and the mass fraction of the functional filler in the mixed powder is less than 2%.

4. The method for preparing a multifunctional knitted fabric according to claim 1, characterized in that: In step S1, the molecular weight of the high-density polyethylene powder is 400,000 to 500,000; The functional filler comprises a fluorine-containing waterproof agent, organic silicon and a halogen-free flame retardant, and the mass ratio of the fluorine-containing waterproof agent, organic silicon and the halogen-free flame retardant is 1:1:

1.

5. The method for preparing a multifunctional knitted fabric according to claim 1, characterized in that: In step S1, the extrusion granulation after melt blending adopts a twin-screw extruder, the temperature of the twin-screw extruder is 180-200° C., and the rotation speed of the twin-screw extruder is 30-50 rpm.

6. The method for preparing a multifunctional knitted fabric according to claim 1, characterized in that: In step 2, the mass ratio of the modified graphene polyethylene composite masterbatch to the polyethylene slice is 1:0.5-0.8; The molecular weight of the low-density polyethylene slice is 100,000 to 300,000, and the molecular weight of the high-density polyethylene slice is 400,000 to 500,000; The mass ratio of the low-density polyethylene slices to the high-density polyethylene slices is 1:2-4.

7. The method for preparing a multifunctional knitted fabric according to claim 1, characterized in that: In step S2, an auxiliary agent is added during the mixing process of the modified graphene polyethylene composite masterbatch and the polyethylene chips, and the auxiliary agent includes polyisobutylene and styrene-butadiene rubber.

8. The method for preparing a multifunctional knitted fabric according to claim 6, characterized in that: The amount of the additive added is 5-10% of the polyethylene chips.

9. The method for preparing a multifunctional knitted fabric according to claim 1, characterized in that: In step S2, the process parameters of melt spinning are: the temperature of the feed section is 130-180°C, the temperature of the melting zone is 200-240°C, the temperature of the metering pump is 210-220°C, the temperature of the spinning box is 200-240°C, and the nozzle stretching multiple is 80-120 times.

10. The method for preparing a multifunctional knitted fabric according to claim 1, characterized in that: In step S2, the winding speed is 500-700 m / min; The stretching multiple is 5 to 8 times, and the temperature is 60 to 80°C; The temperature of the heat setting is 100-150° C., and the time is 30 seconds-3 minutes.