A kind of elastic sandwich knitted fabric and preparation method thereof

Abstract

The present invention relates to the technical field of knitted fabrics, and more particularly to a stretch-type sandwich knitted fabric and a preparation method thereof, comprising the following steps: Step 1: Selecting modified polyester yarn as a raw material, spinning three 25D modified polyester yarns to form polyester 75D / FDY, then using the polyester 75D / FDY as the raw material for the surface layer and the bottom layer, and using the 30D modified polyester yarn as the raw material for the middle layer. The sandwich knitted fabric of the present invention uses modified polyester yarn as a raw material, spinning the modified polyester yarn to form polyester 75D / FDY, and using the 30D modified polyester yarn as the raw material for the middle layer and the polyester 75D / FDY as the raw material for the surface layer and the bottom layer. Through the coordination between the layers and the optimization of the specific process of the modified polyester yarn, the obtained sandwich knitted fabric can achieve coordinated improvements in elasticity, thermal insulation, and bursting strength, and the product has significant UV resistance and weathering stability.

Description

Technical Field

[0001] The invention relates to the technical field of knitted fabrics, and in particular to a stretch-type sandwich knitted fabric and a preparation method thereof. Background Art

[0002] Sandwich fabrics consist of three surfaces: top, middle, and bottom. The top surface is typically a mesh design, with a middle layer of MOLO yarn connecting the top and bottom surfaces. The bottom surface is typically a densely woven flat surface, commonly known as a "sandwich." Existing sandwich knitted fabrics suffer from poor elasticity, poor thermal insulation, and poor bursting strength. This makes it difficult to achieve a coordinated improvement in elasticity, thermal insulation, and bursting strength. Furthermore, the product suffers from poor UV and weathering stability, limiting its effectiveness. Summary of the Invention

[0003] In view of the defects of the prior art, the purpose of the present invention is to provide a stretch sandwich knitted fabric and a preparation method thereof to solve the problems raised in the above background technology.

[0004] The present invention solves the technical problem by adopting the following technical solutions:

[0005] The present invention provides a method for preparing a stretch-type sandwich knitted fabric, comprising the following steps:

[0006] Step 1: Select modified polyester yarn as raw material, spin three 25D modified polyester yarns to form polyester 75D / FDY, then use polyester 75D / FDY as the raw material for the surface layer and bottom layer, and 30D modified polyester yarn as the raw material for the middle layer;

[0007] Step 2: Arrange the surface layer, the middle layer and the bottom layer from top to bottom and weave them together using a weaving machine to form a sandwich fabric.

[0008] Step 3: The sandwich fabric is overfed, with the upper overfeed amount being 55% and the lower overfeed amount being 15%. Finally, the fabric is shaped at 180°C for 30 seconds to obtain a stretch sandwich knitted fabric.

[0009] Preferably, the preparation method of the modified polyester yarn is:

[0010] S01: 85-90 parts of polyester resin, 9-11 parts of weathering-resistant additive, and 5-8 parts of synergist are melt-blended and extruded at a temperature of 285-300° C. and a pressure of 8 MPa to obtain polyester masterbatch;

[0011] S02: melt-spinning the polyester masterbatch and the toughening agent in a weight ratio of 5:1, and obtaining modified polyester yarn after the spinning is completed.

[0012] Preferably, the spinning speed of the melt spinning process is 3000 m / min; and the toughening agent is epoxy cyclohexane polyether polyol.

[0013] Preferably, the preparation method of the additive based on weathering continuous adjustment is:

[0014] S11: preheating mullite at 55-60° C. for 1 hour to obtain preheated mullite; and uniformly blending 3-5 parts of the preheated mullite, 2-4 parts of flaky talc, and 5-8 parts of an 8% by weight sodium citrate solution to obtain a mullite-admixed solution.

[0015] S12: Preparation of weathering and conditioning liquid:

[0016] S12a: heat treating the nano-mica powder at 150-170° C. for 1 hour, and then air-cooling to room temperature to obtain thermally improved nano-mica powder;

[0017] S12b: uniformly blending 4-7 parts of thermally modified nano-mica powder, 5-8 parts of sodium hexametaphosphate solution, and 2-4 parts of nano-calcium carbonate by weight to obtain a temperature-resistant and weather-resistant solution;

[0018] S13: Immersing the carbon nanotubes in a mullite-doped solution 3-5 times the total weight of the carbon nanotubes and stirring, filtering and drying after stirring, to obtain a mullite-doped carbon nanotube agent;

[0019] S14: The carbon nanotube agent mixed with mullite and the weathering and conditioning liquid were mixed in a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain a weathering and conditioning additive.

[0020] Preferably, the stirring speed of the stirring treatment is 350-400 r / min, and the stirring is for 2 hours; the mass fraction of the sodium hexametaphosphate solution is 5-8%.

[0021] Preferably, the preparation method of the tonic is:

[0022] S101: pre-treating the silicon carbide with a sufficient amount of 8-10% by mass nitric acid solution for 1 hour at a speed of 200 r / min. After the treatment, washing, filtering, and drying to obtain dry silicon carbide;

[0023] 5-8 parts of dried silicon carbide, 1-2 parts of nano-silica sol and 6-10 parts of sodium lignin sulfonate solution are uniformly mixed by weight to obtain silicon carbide liquid;

[0024] S102: Ultrasonic treatment is performed on the silicon carbide liquid and the effect-regulating and replenishing agent in a weight ratio of 5:3. After the treatment is completed, the solution is filtered and dried to obtain the effect-regulating and replenishing agent.

[0025] Preferably, the mass fraction of the sodium lignin sulfonate solution is 4-6%; the ultrasonic power of the ultrasonic treatment is 350-400W, and the ultrasonic treatment is performed for 1 hour.

[0026] Preferably, the preparation method of the efficacy-regulating and supplementing agent is:

[0027] 5-8 parts of boron nitride fiber and 2-3 parts of strontium titanate are blended and added into 6-10 parts of sodium dodecylbenzene sulfonate solution, and then 1-2 parts of zirconium oxide and 2-4 parts of sodium silicate solution are added and blended and stirred thoroughly, and finally filtered and dried to obtain an effect-regulating and replenishing agent.

[0028] Preferably, the mass fraction of the sodium dodecylbenzenesulfonate solution is 4-7%; the mass fraction of the sodium silicate solution is 2-5%.

[0029] The present invention also provides a method for preparing a stretch type sandwich knitted fabric and a stretch type sandwich knitted fabric prepared therefrom.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The sandwich knitted fabric of the present invention uses modified polyester yarn as raw material, and the modified polyester yarn is spun to form polyester 75D / FDY. 30D modified polyester yarn is used as the raw material for the middle layer, and polyester 75D / FDY is used as the raw material for the surface layer and bottom layer. Through the coordination between the layers and the optimization of the specific process of the modified polyester yarn, the obtained sandwich knitted fabric can achieve coordinated improvements in elasticity, thermal insulation and bursting strength, and the product has significant UV resistance and weathering stability.

[0032] 2. The modified polyester yarn uses polyester resin as the matrix, and is melt-blended, extruded and granulated with weathering-resistant continuous-adjustment additives and synergistic agents, and then melt-spinned to obtain the modified polyester yarn. The weathering-resistant continuous-adjustment additives and synergistic agents are synergized to further optimize the performance of the modified polyester yarn in the system.

[0033] 3. The weather-resistant additive adopts a carbon nanotube agent that is continuously adjusted with mullite and is blended with a weather-resistant liquid through ball milling. At the same time, the carbon nanotube agent that is continuously adjusted with mullite is preheated, and then blended with flaky talc powder and sodium citrate solution, and then improved by stirring with carbon nanotubes. The carbon nanotubes with high specific surface area are used to carry the mullite and talc system to optimize the performance coordination and stability of the product. The weather-resistant liquid adopts nano-mica powder that is heat-improved to optimize its active efficiency, and is then blended with sodium hexametaphosphate solution and nano-calcium carbonate. Through the blending improvement between the carbon nanotube agent that is continuously adjusted with mullite and the weather-resistant liquid, the lamellar nano-mica powder is interspersed in the system, and the carbon nanotube agent that is continuously adjusted with mullite is blended at the same time. The raw materials cooperate with each other to strengthen the performance effect of the system, thereby further improving the product performance.

[0034] 4. The tonic agent uses silicon carbide treated with an acid solution to optimize its active efficiency, and then optimized and blended with nano-silica sol and sodium lignin sulfonate solution to enhance the dispersion and active efficiency of silicon carbide. At the same time, the tonic agent is further improved and coordinated through ultrasound. The tonic agent uses boron nitride fiber as the matrix, and then blends strontium titanate, zirconium oxide, sodium silicate solution and sodium dodecylbenzene sulfonate solution. Through the coordination and synergy between the raw materials, the needle-shaped boron nitride fiber structure is used to reinforce the system. At the same time, through the coordination and blending between the raw materials, the synergistic effect of the tonic agent and the additive based on weathering continuous adjustment is further enhanced, thereby further improving the performance of the product. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] A method for preparing a stretch sandwich knitted fabric according to this embodiment includes the following steps:

[0037] Step 1: Select modified polyester yarn as raw material, spin three 25D modified polyester yarns to form polyester 75D / FDY, then use polyester 75D / FDY as the raw material for the surface layer and bottom layer, and 30D modified polyester yarn as the raw material for the middle layer;

[0038] Step 2: Arrange the surface layer, the middle layer and the bottom layer from top to bottom and weave them together using a weaving machine to form a sandwich fabric.

[0039] Step 3: The sandwich fabric is overfed, with the upper overfeed amount being 55% and the lower overfeed amount being 15%. Finally, the fabric is shaped at 180°C for 30 seconds to obtain a stretch sandwich knitted fabric.

[0040] The preparation method of the modified polyester yarn of this embodiment is:

[0041] S01: 85-90 parts of polyester resin, 9-11 parts of weathering-resistant additive, and 5-8 parts of synergist are melt-blended and extruded at a temperature of 285-300° C. and a pressure of 8 MPa to obtain polyester masterbatch;

[0042] S02: melt-spinning the polyester masterbatch and the toughening agent in a weight ratio of 5:1, and completing the spinning to obtain modified polyester yarn.

[0043] The spinning speed of the melt spinning process in this embodiment is 3000 m / min; the toughening agent is epoxy cyclohexane polyether polyol.

[0044] The preparation method of the weather-resistant continuous adjustment additive in this embodiment is as follows:

[0045] S11: preheating mullite at 55-60° C. for 1 hour to obtain preheated mullite; and uniformly blending 3-5 parts of the preheated mullite, 2-4 parts of flaky talc, and 5-8 parts of an 8% by weight sodium citrate solution to obtain a mullite-admixed solution.

[0046] S12: Preparation of weathering and conditioning liquid:

[0047] S12a: heat treating the nano-mica powder at 150-170° C. for 1 hour, and then air-cooling to room temperature to obtain thermally improved nano-mica powder;

[0048] S12b: uniformly blending 4-7 parts of thermally modified nano-mica powder, 5-8 parts of sodium hexametaphosphate solution, and 2-4 parts of nano-calcium carbonate by weight to obtain a temperature-resistant and weather-resistant solution;

[0049] S13: Immersing the carbon nanotubes in a mullite-doped solution 3-5 times the total weight of the carbon nanotubes and stirring, filtering and drying after stirring, to obtain a mullite-doped carbon nanotube agent;

[0050] S14: The carbon nanotube agent mixed with mullite and the weathering and conditioning liquid were mixed in a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain a weathering and conditioning additive.

[0051] The stirring speed of the stirring treatment in this embodiment is 350-400 r / min, and the stirring is for 2 hours; the mass fraction of the sodium hexametaphosphate solution is 5-8%.

[0052] The preparation method of the tonic of this embodiment is as follows:

[0053] S101: pre-treating the silicon carbide with a sufficient amount of 8-10% by mass nitric acid solution for 1 hour at a speed of 200 r / min. After the treatment, washing, filtering, and drying to obtain dry silicon carbide;

[0054] 5-8 parts of dried silicon carbide, 1-2 parts of nano-silica sol and 6-10 parts of sodium lignin sulfonate solution are uniformly mixed by weight to obtain silicon carbide liquid;

[0055] S102: Ultrasonic treatment is performed on the silicon carbide liquid and the effect-regulating and replenishing agent in a weight ratio of 5:3. After the treatment is completed, the solution is filtered and dried to obtain the effect-regulating and replenishing agent.

[0056] The mass fraction of the sodium lignin sulfonate solution in this embodiment is 4-6%; the ultrasonic power of the ultrasonic treatment is 350-400W, and the ultrasonic treatment is performed for 1 hour.

[0057] The preparation method of the effect-regulating and replenishing agent of this embodiment is:

[0058] 5-8 parts of boron nitride fiber and 2-3 parts of strontium titanate are blended and added into 6-10 parts of sodium dodecylbenzene sulfonate solution, and then 1-2 parts of zirconium oxide and 2-4 parts of sodium silicate solution are added and blended and stirred thoroughly, and finally filtered and dried to obtain an effect-regulating and replenishing agent.

[0059] The mass fraction of the sodium dodecylbenzenesulfonate solution in this embodiment is 4-7%; the mass fraction of the sodium silicate solution is 2-5%.

[0060] The elastic sandwich knitted fabric is prepared by a method for preparing an elastic sandwich knitted fabric in this embodiment.

[0061] Example 1: A method for preparing a stretch sandwich knitted fabric, comprising the following steps:

[0062] Step 1: Select modified polyester yarn as raw material, spin three 25D modified polyester yarns to form polyester 75D / FDY, then use polyester 75D / FDY as the raw material for the surface layer and bottom layer, and 30D modified polyester yarn as the raw material for the middle layer;

[0063] Step 2: Arrange the surface layer, the middle layer and the bottom layer from top to bottom and weave them together using a weaving machine to form a sandwich fabric.

[0064] Step 3: The sandwich fabric is overfed, with the upper overfeed amount being 55% and the lower overfeed amount being 15%. Finally, the fabric is shaped at 180°C for 30 seconds to obtain a stretch sandwich knitted fabric.

[0065] The preparation method of the modified polyester yarn of this embodiment is:

[0066] S01: 85 parts of polyester resin, 9 parts of weathering-resistant additive, and 5 parts of synergist were melt-blended and extruded at a temperature of 285°C and a pressure of 8 MPa to obtain polyester masterbatch;

[0067] S02: melt-spinning the polyester masterbatch and the toughening agent in a weight ratio of 5:1, and completing the spinning to obtain modified polyester yarn.

[0068] The spinning speed of the melt spinning process in this embodiment is 3000 m / min; the toughening agent is epoxy cyclohexane polyether polyol.

[0069] The preparation method of the weather-resistant continuous adjustment additive in this embodiment is as follows:

[0070] S11: preheating mullite at 55° C. for 1 hour to obtain preheated mullite; and uniformly blending 3 parts of the preheated mullite, 2 parts of flaky talc, and 5 parts of an 8% sodium citrate solution by weight to obtain a mullite-blending solution;

[0071] S12: Preparation of weathering and conditioning liquid:

[0072] S12a: heat-treating the nano-mica powder at 150° C. for 1 h, and then air-cooling to room temperature to obtain thermally improved nano-mica powder;

[0073] S12b: Blend 4 parts of heat-modified nano-mica powder, 5 parts of sodium hexametaphosphate solution, and 2 parts of nano-calcium carbonate by weight to obtain a temperature-resistant and weather-resistant solution;

[0074] S13: Immersing the carbon nanotubes in a mullite-doped solution with a weight three times the total weight of the carbon nanotubes and stirring, filtering, and drying to obtain a mullite-doped carbon nanotube agent;

[0075] S14: The carbon nanotube agent mixed with mullite and the weathering and conditioning liquid were mixed in a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain a weathering and conditioning additive.

[0076] The stirring speed of the stirring treatment in this embodiment is 350 / min, and the stirring is for 2 hours; the mass fraction of the sodium hexametaphosphate solution is 5%.

[0077] The preparation method of the tonic of this embodiment is as follows:

[0078] S101: pre-treating the silicon carbide with a sufficient amount of 8% by mass nitric acid solution for 1 hour at a speed of 200 r / min. After the treatment, washing, filtering, and drying to obtain dry silicon carbide;

[0079] 5 parts of dry silicon carbide, 1 part of nano-silica sol and 6 parts of sodium lignin sulfonate solution were mixed uniformly by weight to obtain silicon carbide liquid;

[0080] S102: Ultrasonic treatment is performed on the silicon carbide liquid and the effect-regulating and replenishing agent in a weight ratio of 5:3. After the treatment is completed, the solution is filtered and dried to obtain the effect-regulating and replenishing agent.

[0081] The mass fraction of the sodium lignin sulfonate solution in this embodiment is 4%; the ultrasonic power of the ultrasonic treatment is 350 W, and the ultrasonic treatment is performed for 1 hour.

[0082] The preparation method of the effect-regulating and replenishing agent of this embodiment is:

[0083] 5 parts of boron nitride fiber and 2 parts of strontium titanate are blended and added into 6 parts of sodium dodecylbenzene sulfonate solution according to weight, and then 1 part of zirconium oxide and 2 parts of sodium silicate solution are added and blended and stirred thoroughly, and finally filtered and dried to obtain an effect-regulating supplement.

[0084] The mass fraction of the sodium dodecylbenzenesulfonate solution in this embodiment is 4%; the mass fraction of the sodium silicate solution is 2%.

[0085] The elastic sandwich knitted fabric is prepared by a method for preparing an elastic sandwich knitted fabric in this embodiment.

[0086] Example 2: A method for preparing a stretch sandwich knitted fabric, comprising the following steps:

[0087] Step 1: Select modified polyester yarn as raw material, spin three 25D modified polyester yarns to form polyester 75D / FDY, then use polyester 75D / FDY as the raw material for the surface layer and bottom layer, and 30D modified polyester yarn as the raw material for the middle layer;

[0088] Step 2: Arrange the surface layer, the middle layer and the bottom layer from top to bottom and weave them together using a weaving machine to form a sandwich fabric.

[0089] Step 3: The sandwich fabric is overfed, with the upper overfeed amount being 55% and the lower overfeed amount being 15%. Finally, the fabric is shaped at 180°C for 30 seconds to obtain a stretch sandwich knitted fabric.

[0090] The preparation method of the modified polyester yarn of this embodiment is:

[0091] S01: 90 parts of polyester resin, 11 parts of weathering-resistant additive, and 8 parts of synergist were melt-blended and extruded at a temperature of 300°C and a pressure of 8 MPa to obtain polyester masterbatch;

[0092] S02: melt-spinning the polyester masterbatch and the toughening agent in a weight ratio of 5:1, and completing the spinning to obtain modified polyester yarn.

[0093] The spinning speed of the melt spinning process in this embodiment is 3000 m / min; the toughening agent is epoxy cyclohexane polyether polyol.

[0094] The preparation method of the weather-resistant continuous adjustment additive in this embodiment is as follows:

[0095] S11: preheating mullite at 60° C. for 1 hour to obtain preheated mullite; and uniformly blending 5 parts of the preheated mullite, 4 parts of flaky talc, and 8 parts of an 8% sodium citrate solution by weight to obtain a mullite-blending solution.

[0096] S12: Preparation of weathering and conditioning liquid:

[0097] S12a: heat-treating the nano-mica powder at 170° C. for 1 h, and then air-cooling to room temperature to obtain thermally improved nano-mica powder;

[0098] S12b: 7 parts of heat-modified nano-mica powder, 8 parts of sodium hexametaphosphate solution, and 4 parts of nano-calcium carbonate are uniformly blended by weight to obtain a temperature-resistant and weather-resistant solution;

[0099] S13: Immersing the carbon nanotubes in a mullite-doped solution with a weight of 5 times the total weight of the carbon nanotubes and stirring, filtering, and drying to obtain a mullite-doped carbon nanotube agent;

[0100] S14: The carbon nanotube agent mixed with mullite and the weathering and conditioning liquid were mixed in a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain a weathering and conditioning additive.

[0101] The stirring speed of the stirring treatment in this embodiment is 400 r / min, and the stirring is for 2 hours; the mass fraction of the sodium hexametaphosphate solution is 8%.

[0102] The preparation method of the tonic of this embodiment is as follows:

[0103] S101: pre-treating the silicon carbide with a sufficient amount of 10% by mass nitric acid solution for 1 hour at a speed of 200 r / min. After the treatment, washing, filtering, and drying to obtain dry silicon carbide;

[0104] 8 parts of dried silicon carbide, 2 parts of nano-silica sol and 10 parts of sodium lignin sulfonate solution were uniformly blended by weight to obtain silicon carbide liquid;

[0105] S102: Ultrasonic treatment is performed on the silicon carbide liquid and the effect-regulating and replenishing agent in a weight ratio of 5:3. After the treatment is completed, the solution is filtered and dried to obtain the effect-regulating and replenishing agent.

[0106] The mass fraction of the sodium lignin sulfonate solution in this embodiment is 6%; the ultrasonic power of the ultrasonic treatment is 400 W, and the ultrasonic treatment is performed for 1 hour.

[0107] The preparation method of the effect-regulating and replenishing agent of this embodiment is:

[0108] 8 parts of boron nitride fiber and 3 parts of strontium titanate were blended and added into 10 parts of sodium dodecylbenzene sulfonate solution, and then 2 parts of zirconium oxide and 4 parts of sodium silicate solution were added and blended and stirred thoroughly, and finally filtered and dried to obtain an effect-regulating supplement.

[0109] The mass fraction of the sodium dodecylbenzenesulfonate solution in this embodiment is 7%; the mass fraction of the sodium silicate solution is 5%.

[0110] The elastic sandwich knitted fabric is prepared by a method for preparing an elastic sandwich knitted fabric in this embodiment.

[0111] Example 3: A method for preparing a stretch sandwich knitted fabric, comprising the following steps:

[0112] Step 1: Select modified polyester yarn as raw material, spin three 25D modified polyester yarns to form polyester 75D / FDY, then use polyester 75D / FDY as the raw material for the surface layer and bottom layer, and 30D modified polyester yarn as the raw material for the middle layer;

[0113] Step 2: Arrange the surface layer, the middle layer and the bottom layer from top to bottom and weave them together using a weaving machine to form a sandwich fabric.

[0114] Step 3: The sandwich fabric is overfed, with the upper overfeed amount being 55% and the lower overfeed amount being 15%. Finally, the fabric is shaped at 180°C for 30 seconds to obtain a stretch sandwich knitted fabric.

[0115] The preparation method of the modified polyester yarn of this embodiment is:

[0116] S01: 87.5 parts of polyester resin, 10 parts of weathering-resistant additive, and 6.5 parts of synergist were melt-blended and extruded at a temperature of 290° C. and a pressure of 8 MPa to obtain polyester masterbatch;

[0117] S02: melt-spinning the polyester masterbatch and the toughening agent in a weight ratio of 5:1, and completing the spinning to obtain modified polyester yarn.

[0118] The spinning speed of the melt spinning process in this embodiment is 3000 m / min; the toughening agent is epoxy cyclohexane polyether polyol.

[0119] The preparation method of the weather-resistant continuous adjustment additive in this embodiment is as follows:

[0120] S11: preheating mullite at 57.5° C. for 1 hour to obtain preheated mullite; and uniformly blending 4 parts of the preheated mullite, 3 parts of flaky talc, and 6.5 parts of an 8% sodium citrate solution by weight to obtain a mullite-blending solution.

[0121] S12: Preparation of weathering and conditioning liquid:

[0122] S12a: heat-treating the nano-mica powder at 160° C. for 1 h, and then air-cooling to room temperature to obtain thermally improved nano-mica powder;

[0123] S12b: 5.5 parts of heat-modified nano-mica powder, 6.5 parts of sodium hexametaphosphate solution, and 3 parts of nano-calcium carbonate are uniformly blended by weight to obtain a temperature-resistant and weather-resistant solution;

[0124] S13: Immersing the carbon nanotubes in a mullite-doped solution with a weight of 4 times the total weight of the carbon nanotubes and stirring, filtering, and drying to obtain a mullite-doped carbon nanotube agent;

[0125] S14: The carbon nanotube agent mixed with mullite and the weathering and conditioning liquid were mixed in a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain a weathering and conditioning additive.

[0126] The stirring speed of the stirring treatment in this embodiment is 370 r / min, and the stirring is for 2 hours; the mass fraction of the sodium hexametaphosphate solution is 6.5%.

[0127] The preparation method of the tonic of this embodiment is as follows:

[0128] S101: pre-treating the silicon carbide with a sufficient amount of 9% by mass nitric acid solution for 1 hour at a speed of 200 r / min. After the treatment, washing, filtering, and drying to obtain dry silicon carbide;

[0129] 6.5 parts of dried silicon carbide, 1.5 parts of nano-silica sol and 8 parts of sodium lignin sulfonate solution were mixed uniformly by weight to obtain silicon carbide liquid;

[0130] S102: Ultrasonic treatment is performed on the silicon carbide liquid and the effect-regulating and replenishing agent in a weight ratio of 5:3. After the treatment is completed, the solution is filtered and dried to obtain the effect-regulating and replenishing agent.

[0131] The mass fraction of the sodium lignin sulfonate solution in this embodiment is 5%; the ultrasonic power of the ultrasonic treatment is 375W, and the ultrasonic treatment is performed for 1 hour.

[0132] The preparation method of the effect-regulating and replenishing agent of this embodiment is:

[0133] 6.5 parts of boron nitride fiber and 2.5 parts of strontium titanate were blended and added into 8 parts of sodium dodecylbenzene sulfonate solution, and then 1.5 parts of zirconium oxide and 3 parts of sodium silicate solution were added and blended and stirred thoroughly, and finally filtered and dried to obtain an effect-regulating supplement.

[0134] The mass fraction of the sodium dodecylbenzenesulfonate solution in this embodiment is 5.5%; the mass fraction of the sodium silicate solution is 3.5%.

[0135] The elastic sandwich knitted fabric is prepared by a method for preparing an elastic sandwich knitted fabric in this embodiment.

[0136] Comparative Example 1:

[0137] The difference from Example 3 is that no additives for weathering-resistant continuous adjustment are added.

[0138] Comparative Example 2:

[0139] The difference from Example 3 is that the carbon nanotube agent for continuous adjustment of mullite is not added in the preparation of the additive for continuous adjustment of weather resistance.

[0140] Comparative Example 3:

[0141] The difference from Example 3 is that no mullite-adjusting liquid is added in the preparation of the carbon nanotube agent for continuous adjustment with mullite.

[0142] Comparative Example 4:

[0143] The difference from Example 3 is that no mullite or flaky talc is added to the mullite blending solution.

[0144] Comparative Example 5:

[0145] The difference from Example 3 is that no carbon nanotubes are added in the preparation of the carbon nanotube agent for continuous adjustment with mullite.

[0146] Comparative Example 6:

[0147] The difference from Example 3 is that no weathering and conditioning liquid is added in the preparation of the additive based on weathering and continuous conditioning.

[0148] Comparative Example 7:

[0149] The difference from Example 3 is that no thermally modified nano-mica powder and nano-calcium carbonate are added in the preparation of the adjustment and weathering resistant liquid.

[0150] Comparative Example 8:

[0151] The difference from Example 3 is that no tonic was added.

[0152] Comparative Example 9:

[0153] The difference from Example 3 is that no silicon carbide liquid is added during the preparation of the tonic agent.

[0154] Comparative Example 10:

[0155] The difference from Example 3 is that no effect-regulating tonic agent is added during the preparation of the tonic agent.

[0156] Comparative Example 11:

[0157] The difference from Example 3 is that boron nitride fiber and strontium titanate are not added in the preparation of the effect-regulating supplement.

[0158] Comparative Example 12:

[0159] The difference from Example 3 is that no zirconium oxide and sodium silicate solution are added in the preparation of the effect-regulating and replenishing agent.

[0160] The products of Examples 1-3 and Comparative Examples 1-12 were tested for elasticity, thermal insulation and bursting strength under normal conditions and weathering conditions. Under weathering conditions, the products were exposed to ultraviolet light at an intensity of 300W / m 2 The performance measurement results are shown in Table 1.

[0161] Table 1 Product performance test results of Examples 1-3 and Comparative Examples 1-12:

[0162]

[0163] From Examples 1-3 and Comparative Examples 1-12, it can be seen that the elasticity of the product of Example 3 of the present invention can reach up to 23%, the warmth retention rate can reach 95%, and the bursting strength can reach up to 804N. The elasticity, warmth retention and bursting strength of the product can be improved in a coordinated manner, and the weather resistance stability of the product is also significant.

[0164] From Comparative Example 1, Comparative Example 8 and Example 3, it can be seen that without adding either the weathering-resistant continuous adjustment additive or the synergist, the product performance deteriorates significantly. Only by using the two additives in combination and synergistically, the product performance effect is most significant.

[0165] From Comparative Examples 1-7 and Example 3, it can be seen that the carbon nanotube agent based on the weathering continuous adjustment additive is not added to the carbon nanotube agent adjusted by mullite, the carbon nanotube agent prepared by mullite continuous adjustment does not add mullite doping liquid, the mullite doping liquid does not add mullite and flaky talc, the carbon nanotube agent prepared by mullite continuous adjustment does not add carbon nanotubes, the additive preparation based on weathering continuous adjustment does not add weathering liquid, and the heat-improved nano-mica powder and nano-calcium carbonate are not added to the preparation of weathering liquid. The performance of the products all tends to deteriorate;

[0166] The carbon nanotube agent obtained by the specific method of the present invention is combined with the weathering liquid to prepare the weathering additive based on the weathering continuous adjustment. The performance effect of the product is the most significant. Other methods are not as significant as the effect of the present invention. The preparation of the weathering liquid and the mullite-doped liquid requires the specific raw materials of the present invention to achieve the most significant effect. Other methods are not as significant as the effect of the present invention.

[0167] From Comparative Examples 9-12 and Example 3, it can be seen that no silicon carbide liquid was added to the preparation of the tonic agent, no effect-regulating and replenishing agent was added to the preparation of the tonic agent, no boron nitride fiber and strontium titanate were added to the preparation of the tonic agent, and no zirconium oxide and sodium silicate solution were added to the preparation of the tonic agent. The performance of the products all showed a trend of deterioration to varying degrees.

[0168] The performance of the product made by combining the effect-regulating and replenishing agent obtained by the specific method of the present invention with silicon carbide liquid is the most significant, and the preparation of the effect-regulating and replenishing agent is proprietary. If other methods are used instead, the effect will not be as obvious as the solution of the present invention.

[0169] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0170] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for preparing a stretch sandwich knitted fabric, characterized in that: The following steps are involved: Step 1: Select modified polyester yarn as raw material, spin three 25D modified polyester yarns to form polyester 75D / FDY, then use polyester 75D / FDY as the raw material for the surface layer and bottom layer, and 30D modified polyester yarn as the raw material for the middle layer; The preparation method of the modified polyester yarn is: S01: 85-90 parts of polyester resin, 9-11 parts of weathering-resistant additive, and 5-8 parts of synergist are melt-blended and extruded at a temperature of 285-300° C. and a pressure of 8 MPa to obtain polyester masterbatch; S02: melt-spinning the polyester masterbatch and the toughening agent in a weight ratio of 5:1, and obtaining modified polyester yarn after the spinning is completed; Step 2: Arrange the surface layer, the middle layer and the bottom layer from top to bottom and weave them together using a weaving machine to form a sandwich fabric. Step 3: Overfeed the sandwich fabric, with the upper overfeed amount being 55% and the lower overfeed amount being 15%. Finally, set the fabric at 180°C for 30 seconds to obtain a stretch sandwich knitted fabric. The preparation method of the additive based on weathering continuous adjustment is: S11: preheating mullite at 55-60° C. for 1 hour to obtain preheated mullite; and uniformly blending 3-5 parts of the preheated mullite, 2-4 parts of flaky talc, and 5-8 parts of an 8% by weight sodium citrate solution to obtain a mullite-admixed solution. S12: Preparation of weathering and conditioning liquid: S12a: heat treating the nano-mica powder at 150-170° C. for 1 hour, and then air-cooling to room temperature to obtain thermally improved nano-mica powder; S12b: uniformly blending 4-7 parts of thermally modified nano-mica powder, 5-8 parts of sodium hexametaphosphate solution, and 2-4 parts of nano-calcium carbonate by weight to obtain a temperature-resistant and weather-resistant solution; S13: Immersing the carbon nanotubes in a mullite-doped solution 3-5 times the total weight of the carbon nanotubes and stirring, filtering and drying after stirring, to obtain a mullite-doped carbon nanotube agent; S14: The carbon nanotube agent and the weathering and conditioning liquid are mixed in a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After the ball milling is completed, the mixture is filtered and dried to obtain a weathering and conditioning additive. The preparation method of the tonic is as follows: S101: pre-treating the silicon carbide with a sufficient amount of 8-10% by mass nitric acid solution for 1 hour at a speed of 200 r / min. After the treatment, washing, filtering, and drying to obtain dry silicon carbide; 5-8 parts of dried silicon carbide, 1-2 parts of nano-silica sol and 6-10 parts of sodium lignin sulfonate solution are uniformly mixed by weight to obtain silicon carbide liquid; S102: Ultrasonic treatment is performed on the silicon carbide liquid and the effect-regulating and replenishing agent in a weight ratio of 5:

3. After the treatment is completed, the mixture is filtered and dried to obtain the effect-regulating and replenishing agent; The preparation method of the effect-regulating and replenishing agent is as follows: 5-8 parts of boron nitride fiber and 2-3 parts of strontium titanate are blended and added into 6-10 parts of sodium dodecylbenzene sulfonate solution, and then 1-2 parts of zirconium oxide and 2-4 parts of sodium silicate solution are added and blended and stirred thoroughly, and finally filtered and dried to obtain an effect-regulating and replenishing agent.

2. The method for preparing a stretch sandwich knitted fabric according to claim 1, wherein: The spinning speed of the melt spinning process is 3000 m / min.

3. The method for preparing a stretch sandwich knitted fabric according to claim 1, wherein: The toughening agent is epoxy cyclohexane polyether polyol.

4. The method for preparing a stretch sandwich knitted fabric according to claim 1, wherein: The stirring speed of the stirring treatment is 350-400 r / min, and the stirring is performed for 2 hours; the mass fraction of the sodium hexametaphosphate solution is 5-8%.

5. The method for preparing a stretch sandwich knitted fabric according to claim 1, wherein: The mass fraction of the sodium lignin sulfonate solution is 4-6%; the ultrasonic power of the ultrasonic treatment is 350-400W, and the ultrasonic treatment is performed for 1 hour.

6. The method for preparing a stretch sandwich knitted fabric according to claim 1, characterized in that: The mass fraction of the sodium dodecylbenzenesulfonate solution is 4-7%; the mass fraction of the sodium silicate solution is 2-5%.

7. A stretch type sandwich knitted fabric, prepared by the method for preparing a stretch type sandwich knitted fabric according to any one of claims 1 to 6.

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