Preparation method of polyethylene non-woven fabric two-in-one composite fabric

Abstract

The application provides a preparation method of a polyethylene non-woven fabric two-in-one composite fabric, and relates to the technical field of textiles.The application prepares a polyethylene non-woven fabric through flash spinning after recycling and granulating waste polyethylene waste materials, and then obtains a two-in-one composite fabric by compounding the polyethylene non-woven fabric and a nylon knitted fabric through a PUR moisture curing type hot melt adhesive compounding mode.The fabric has good comfort, does not generate fuzz and pilling after friction and multiple washing, has good anti-fuzz and anti-pilling properties, reduces the use risk, and can be used for bags and clothes, thereby expanding the use range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textiles, and particularly relates to a preparation method of a polyethylene non-woven fabric two-in-one composite fabric. BACKGROUND

[0002] Polyethylene is one of the most widely used plastics at present, has the characteristics of low density, high strength, corrosion resistance, high temperature resistance and aging resistance, and is widely used in packaging, construction, home and electronic fields. However, the use of polyethylene is large, resulting in a large amount of waste polyethylene plastic, and these waste polyethylene plastics are difficult to degrade, and have an increasingly significant impact on the environment, society and economy, so the treatment and reuse of waste polyethylene plastics have become an important issue in environmental pollution control. At present, there are many studies on the recycling of waste polyethylene plastics, such as the patent CN104629152A discloses recycling waste high-density polyethylene plastic to produce 3D printing materials, and the patent CN115304055A discloses preparing high-quality carbon nanotubes from polyethylene waste plastics through a two-stage conversion pyrolysis process.

[0003] Polyethylene is one of the commonly used materials for producing non-woven fabrics, and its main forming processes include melt blowing, bonding, water / needle punching and flash spinning. Flash spinning is mainly based on the fact that polyethylene is dissolved in a solvent at high temperature and high pressure to form a spinning solution. After spinning, the solvent in the spinning solution is instantaneously flashed, the polymer is split and solidified into ultra-fine fiber bundles, the fiber bundles form a fiber web under the action of static electricity, and the fiber web is formed into a non-woven fabric by hot rolling with a heated roller. The strength of the flash non-woven fabric is higher than that of the same surface density of the spun-bonded non-woven fabric, and compared with the surface-bonded non-woven fabric, the product obtained by the flash process has a good paper-like appearance and a more flat surface. In recent years, the use of air amplifiers instead of traditional electrostatic opening equipment has been proposed, which improves the opening efficiency and fiber orientation, greatly promoting the development of domestic flash non-woven fabric preparation technology. Therefore, if waste polyethylene is used as raw material to prepare products by flash spinning process, a new technology for directly, simply and efficiently realizing the value-added reuse of waste polyethylene can be developed.

[0004] In recent years, some progress has been made in the preparation of non-woven fabrics from recycled polyethylene by flash spinning method, but recycled polyethylene has defects such as poor strength and poor softness. When the non-woven fabric prepared from recycled polyethylene is washed repeatedly or subjected to external friction during wearing, the cohesive force between the fibers is poor, which easily causes pilling and affects the appearance and use performance. Therefore, it is necessary to provide a polyethylene non-woven fabric two-in-one composite fabric with good anti-pilling property. SUMMARY

[0005] The polyethylene non-woven fabric two-in-one composite fabric is prepared by recycling and granulating the waste polyethylene waste, then blending with modified polyvinyl butyral, and then preparing polyethylene non-woven fabric through flash spinning, and finally, the polyethylene non-woven fabric is compounded with the nylon knitted fabric through the PUR moisture-curable hot melt adhesive compounding method to obtain the two-in-one composite fabric. The composite fabric has good comfort, strong yarn fixing capacity, and will not generate fuzz and pilling after friction and multiple washing, thereby reducing the use risk. The composite fabric can be used for bags and clothes, thereby expanding the use range.

[0006] To achieve the above object, the technical scheme adopted by the present application is:

[0007] The polyethylene non-woven fabric two-in-one composite fabric comprises polyethylene non-woven fabric and 20D nylon warp-knitted fabric, and the polyethylene non-woven fabric and the 20D nylon warp-knitted fabric are attached by using PUR moisture-curable hot melt adhesive.

[0008] The polyol in the PUR moisture-curable hot melt adhesive comprises rosin polyester polyol, cashew shell oil polyether polyol and castor oil polyester polyol.

[0009] Further, the polyethylene non-woven fabric is prepared by flash spinning of recycled polyethylene.

[0010] Further, the weight of the polyethylene non-woven fabric is greater than or equal to 50 g / m 2 and less than or equal to 65 g / m 2 .

[0011] Further, the weight of the 20D nylon warp-knitted fabric is greater than or equal to 25 g / m 2 and less than or equal to 40 g / m 2 .

[0012] Further, in the PUR moisture-curable hot melt adhesive, the amount of cashew shell oil polyether polyol in the polyol is greater than or equal to 2 times and less than or equal to 4 times the amount of rosin polyester polyol, and the amount of castor oil polyester polyol is greater than or equal to 0.2 times and less than or equal to 1 times the amount of rosin polyester polyol.

[0013] Preferably, in the PUR moisture-curable hot melt adhesive, the amount of cashew shell oil polyether polyol in the polyol is greater than or equal to 3 times and less than or equal to 3.5 times the amount of rosin polyester polyol, and the amount of castor oil polyester polyol is greater than or equal to 0.4 times and less than or equal to 0.6 times the amount of rosin polyester polyol.

[0014] Further, the PUR moisture-curing hot melt adhesive described above comprises the following raw materials in parts by weight: polyol greater than or equal to 50 parts and less than or equal to 70 parts, diisocyanate greater than or equal to 40 parts and less than or equal to 50 parts, chain extender greater than or equal to 1 part and less than or equal to 3 parts, catalyst greater than or equal to 0.3 parts and less than or equal to 1 part.

[0015] Preferably, the PUR moisture-curing hot melt adhesive described above comprises the following raw materials in parts by weight: polyol greater than or equal to 60 parts and less than or equal to 65 parts, diisocyanate greater than or equal to 45 parts and less than or equal to 46 parts, chain extender greater than or equal to 2 parts and less than or equal to 2.5 parts, catalyst greater than or equal to 0.4 parts and less than or equal to 0.5 parts.

[0016] In some embodiments, the diisocyanate in the PUR moisture-curing hot melt adhesive described above is selected from at least one of aromatic polyisocyanate, aliphatic polyisocyanate and alicyclic polyisocyanate, preferably at least one of tetramethylene-1,4-diisocyanate, pentamethylene-1,5-diisocyanate, hexamethylene-1,6-diisocyanate, isophorone diisocyanate, toluene diisocyanate, dicyclohexylmethane diisocyanate, methylcyclohexyl diisocyanate, m-xylylene diisocyanate.

[0017] In some embodiments, the cashew nut shell liquid polyether polyol suitable for the present application in the PUR moisture-curing hot melt adhesive described above is not limited to NX-9212, NX-9201, NX-9203 products of Kardie Chemical Co., Ltd. Rosin polyester polyol is prepared by reacting propylene pimaric acid with dihydric alcohol. Castor oil polyester polyol is prepared by alcoholysis of castor oil and reaction with diacid.

[0018] In some embodiments, the chain extender in the PUR moisture-curing hot melt adhesive described above is selected from at least one of small molecule alcohol chain extender and small molecule amine chain extender, more preferably at least one of 1,4-butanediol, diethylene glycol, glycerol, trimethylolpropane, diethanolamine, triethanolamine, ethanolamine.

[0019] In some embodiments, the catalyst in the PUR moisture-curing hot melt adhesive described above is selected from amine catalyst and organometallic catalyst, the amine catalyst is selected from at least one of N,N-dimethylcyclohexylamine, bis(2-dimethylaminoethyl) ether, N,N,N',N'-tetramethylalkylene diamine, triethylamine, N,N-dimethylbenzylamine, N-ethylmorpholine, N-methylmorpholine, N,N'-diethylpiperazine, pyridine, N,N'-dimethylpyridine, bis-morpholinyl diethyl ether, and the organometallic catalyst is selected from at least one of dibutyl tin dilaurate, stannous octoate and tetrabutyl titanate.

[0020] Further, the PUR moisture curing type hot melt adhesive is prepared by the following method:

[0021] The dehydrated polyol and diisocyanate are mixed, a catalyst is added for reaction, the reaction temperature is greater than or equal to 80°C and less than or equal to 90°C, the reaction time is greater than or equal to 30 min and less than or equal to 60 min, a prepolymer is obtained, then a chain extender is added and reacted at a temperature greater than or equal to 70°C and less than or equal to 85°C, the reaction time is greater than or equal to 20 min and less than or equal to 50 min, finally a curing agent is added and stirred at a temperature greater than or equal to 50°C and less than or equal to 60°C, the time is greater than or equal to 10 min and less than or equal to 30 min, and the PUR moisture curing type hot melt adhesive is obtained.

[0022] The application also provides a preparation method of a polyethylene non-woven fabric two-in-one composite fabric, comprising the following steps:

[0023] The waste high-density polyethylene is washed, high-temperature melted and ground, and then extruded and granulated by an extruder to obtain a recycled polyethylene masterbatch. Then, the recycled polyethylene masterbatch is mixed with a solvent to prepare a spinning solution, and then the spinning solution is spun, laid, hot pressed to obtain a polyethylene non-woven fabric. Then, the polyethylene non-woven fabric is compounded with a polyamide warp-knitted fabric by using the PUR moisture curing type hot melt adhesive, and a polyethylene non-woven fabric two-in-one composite fabric is obtained.

[0024] The application compounds the polyethylene non-woven fabric with the polyamide warp-knitted fabric, further improves the anti-pilling performance of the fabric, and improves the comfort of the polyethylene fiber paper in contact with the skin.

[0025] Further, the high-temperature melting temperature is greater than or equal to 135°C and less than or equal to 145°C, and preferably greater than or equal to 140°C and less than or equal to 145°C.

[0026] Further, in the compounding process, the PUR moisture curing type hot melt adhesive is raised to a temperature greater than or equal to 90°C and less than or equal to 95°C, is spot-coated on the polyethylene non-woven fabric, the polyamide warp-knitted fabric is laminated with the polyethylene non-woven fabric, then the temperature is lowered to greater than or equal to 60°C and less than or equal to 65°C and is kept for a certain time, the cooling rate is greater than or equal to 1°C / min and less than or equal to 3°C / min, the holding time is greater than or equal to 5 min and less than or equal to 10 min, and finally the temperature is lowered to room temperature under natural conditions, and a polyethylene non-woven fabric two-in-one composite fabric is obtained.

[0027] When the application compounds two layers of fabrics by using the PUR moisture curing type hot melt adhesive, it is found that, compared with directly lowering to room temperature under natural conditions, controlling the cooling conditions helps to improve the bonding effect of the fabric, and improves the adhesion and moisture and heat aging resistance.

[0028] Further, the amount of the PUR moisture curing type hot melt adhesive is greater than or equal to 6 g / m2 and less than or equal to 8 g / m 2 .

[0029] In a further scheme, in order to further avoid the problem of incompatibility between the hot melt adhesive and the fabric, resulting in insufficient strength of the adhesive film formed on the surface of the fabric, the polyethylene non-woven fabric and the polyvinyl butyral are further subjected to impregnation treatment before being compounded. The impregnation treatment step comprises: mixing PVB with benzoic acid, octenyl succinic anhydride and an antioxidant, adding a catalyst for reaction, and extruding and granulating by an extruder to obtain modified polyvinyl butyral. Then, the modified polyvinyl butyral is dispersed in water to prepare an impregnation solution with a mass fraction of greater than or equal to 20% and less than or equal to 30%. Then, the polyethylene non-woven fabric and the polyvinyl butyral are subjected to impregnation treatment in the impregnation solution, and the impregnation treatment temperature is greater than or equal to 40°C and less than or equal to 50°C, and the time is greater than or equal to 0.5 h and less than or equal to 2 h.

[0030] Preferably, in the impregnation solution, the amount of benzoic acid is greater than or equal to 15 parts and less than or equal to 20 parts, the amount of octenyl succinic anhydride is greater than or equal to 1 part and less than or equal to 3 parts, the amount of antioxidant is greater than or equal to 0.01 part and less than or equal to 0.5 part, and the amount of catalyst is greater than or equal to 0.05 part and less than or equal to 0.3 part, relative to 100 parts of PVB.

[0031] Preferably, in the impregnation solution, the butyraldehyde degree of the above-mentioned PVB is greater than or equal to 68% and less than or equal to 88%, preferably greater than or equal to 70% and less than or equal to 76%.

[0032] Preferably, the antioxidant comprises at least one of, but is not limited to, tertiary butyl hydroxy anisole, dibutyl hydroxy toluene and tertiary butyl hydroquinone.

[0033] Preferably, the temperature of the extruder is: the temperature of the feeding area is greater than or equal to 140°C and less than or equal to 145°C, the temperature of the plasticizing area is greater than or equal to 155°C and less than or equal to 165°C, and the temperature of the discharge port is greater than or equal to 145°C and less than or equal to 150°C.

[0034] The present application modifies PVB by using benzoic acid and octenyl succinic anhydride, controls the amount of benzoic acid and octenyl succinic anhydride, i.e. controls the grafting rate of PVB, increases the distance between chains, increases the range of movement between molecular chains, improves the toughness and strength of PVB, and improves the surface treatment of the modified PVB on the composite fabric, which helps to improve the strength of the fabric, improve the anti-pilling property, increase the compatibility between the hot melt adhesive and the fabric, and improve the composite strength.

[0035] The application also provides application of the above-mentioned polyethylene non-woven fabric two-in-one composite fabric in garment fabric and packaging bag.

[0036] Compared with the prior art, the application has the following beneficial effects:

[0037] 1. In the application, the regenerated polyethylene is spun into non-woven fabric through flash spinning, and then the non-woven fabric is compounded with 20D polyamide warp-knitted fabric through PUR moisture-curable hot melt adhesive, so that the obtained fabric has high composite strength, excellent anti-pilling property, good comfort and high use safety.

[0038] 2. In the application, rosin polyester polyol, cashew nut shell oil polyether polyol and castor oil polyester polyol are introduced into the PUR moisture-curable hot melt adhesive at the same time, the three polyols cooperate with each other, not only have excellent adhesion and high peel strength, but also can avoid the problem of strength reduction caused by incompatibility between the hot melt adhesive and the fabric and low strength, and can enhance the moisture and heat aging resistance, and still maintain good adhesion after aging resistance test.

[0039] 3. In the application, the cooling rate is controlled during the fabric compounding process, so that the adhesion of the fabric can be improved and the moisture and heat resistance can be improved.

[0040] 4. The obtained fabric can be used for packaging bags and also can be used for garments, so that the use range is expanded. DETAILED DESCRIPTION

[0041] The following non-limiting examples can make those skilled in the art more fully understand the application, but do not limit the application in any way. The following content is only an exemplary description of the scope of the application claimed by the application, and those skilled in the art can make various changes and modifications to the application disclosed, which should also belong to the scope of the application claimed.

[0042] In the following specific examples, the rosin polyester polyol is prepared by the following method: 50 parts of propylene pimaric acid, 80 parts of glycerol and 0.3 parts of catalyst are mixed, the head temperature is controlled to be not more than 105 DEG C, the temperature is raised to 220 DEG C and reacted for 6 hours, when the acid value is about 10 mg / g, the temperature is lowered to 180 DEG C, vacuum is extracted to 95 kPa, the sample is taken to measure the acid value, when the acid value is less than or equal to 3 mg / g, the temperature is lowered to 100 DEG C, and the rosin polyester polyol is obtained, the molecular weight is. The castor oil polyester polyol is prepared by the following method: 50 parts of castor oil and 8 parts of ethylene glycol are mixed, 0.05 parts of lithium hydroxide is added, the temperature is raised to 210 DEG C and kept for 3 hours, the temperature is lowered to 100 DEG C, castor oil alcoholysis product is obtained, then 20 parts of adipic acid is added, the temperature is raised to 145 DEG C and kept for 2 hours, then the temperature is raised to 200 DEG C and kept for 3 hours, vacuum and pressure reduction reaction is carried out, when the acid value is less than or equal to 2 mg / g, the temperature is lowered, and the castor oil polyester polyol is obtained.

[0043] The application will be further described in the following specific examples. The various chemical reagents used in the examples of the application are obtained through conventional commercial channels unless otherwise stated.

[0044] Example 1

[0045] The present embodiment provides a polyethylene non-woven fabric two-in-one composite fabric, which is prepared by the following method:

[0046] (1) The waste high-density polyethylene is washed, melted at 135°C and ground, extruded and granulated by an extruder to obtain a recycled polyethylene masterbatch, which is mixed with a solvent to prepare a spinning solution, and then spun, laid, and hot-pressed to obtain a polyethylene non-woven fabric with a grammage of about 60 g / m 2 .

[0047] (2) 50 parts of dehydrated polyol (mass ratio 1:2:0.2 of rosin polyester polyol, cashew nut shell oil polyether polyol NX-9212 and castor oil polyester polyol), 40 parts of toluene diisocyanate, 0.3 parts of dibutyl tin dilaurate are mixed, and the mixture is reacted at 80°C for 60 min to obtain a prepolymer, and then 1 part of chain extender diethylene glycol is added and reacted at 70°C for 50 min to obtain a PUR moisture-curing hot melt adhesive.

[0048] (3) The polyethylene non-woven fabric obtained in step (1) is compounded with 20D polyamide warp-knitted fabric by using the PUR moisture-curing hot melt adhesive obtained in step (2), and during the compounding process, the temperature of the PUR moisture-curing hot melt adhesive is increased to 90°C, and the adhesive is spot-coated on the polyethylene non-woven fabric (the amount is 6 g / m 2 ), the 20D polyamide warp-knitted fabric is laminated with the polyethylene non-woven fabric, and then the temperature is decreased to 60°C and kept for 5 min at a rate of 1°C / min, and finally the temperature is decreased to room temperature naturally, to obtain a polyethylene non-woven fabric two-in-one composite fabric.

[0049] Example 2

[0050] The present embodiment provides a polyethylene non-woven fabric two-in-one composite fabric, which is prepared by the following method:

[0051] (1) The waste high-density polyethylene is washed, melted at 140°C and ground, extruded and granulated by an extruder to obtain a recycled polyethylene masterbatch, which is mixed with a solvent to prepare a spinning solution, and then spun, laid, and hot-pressed to obtain a polyethylene non-woven fabric with a grammage of about 60 g / m 2 .

[0052] (2)Mix 60 parts of dehydrated polyols (mass ratio 1:3:0.4 of rosin polyester polyol, cashew nut shell oil polyether polyol NX-9212 and castor oil polyester polyol), 45 parts of toluene diisocyanate, add 0.4 parts of dibutyltin dilaurate, and react at 80°C for 60 min to obtain a prepolymer, then add 2 parts of chain extender diethanolamine, and react at 70°C for 50 min to obtain the PUR moisture curing type hot melt adhesive.

[0053] (3) The PUR moisture curing type hot melt adhesive obtained in step (2) is used to compound the polyethylene non-woven fabric obtained in step (1) with 20D nylon warp-knitted fabric. During the compounding process, the temperature of the PUR moisture curing type hot melt adhesive is increased to 90°C, and the adhesive is spot-coated on the polyethylene non-woven fabric (the amount is 6g / m 2 ). Then, the 20D nylon warp-knitted fabric is laminated with the polyethylene non-woven fabric, and then the temperature is decreased to 60°C and kept for 5 min at a cooling rate of 1°C / min. Finally, the temperature is decreased to room temperature naturally to obtain the polyethylene non-woven fabric two-in-one composite fabric.

[0054] Example 3

[0055] The present embodiment provides a polyethylene non-woven fabric two-in-one composite fabric, which is prepared by the following method:

[0056] (1) The waste high-density polyethylene is washed, melted at 145°C and ground, and then extruded and granulated by an extruder to obtain a recycled polyethylene masterbatch. The masterbatch is mixed with a solvent to prepare a spinning solution, and then the solution is jetted, laid, hot-pressed to obtain a polyethylene non-woven fabric with a grammage of about 60g / m 2 .

[0057] (2) Mix 65 parts of dehydrated polyols (mass ratio 1:3.5:0.6 of rosin polyester polyol, cashew nut shell oil polyether polyol NX-9212 and castor oil polyester polyol), 46 parts of toluene diisocyanate, add 0.5 parts of dibutyltin dilaurate, and react at 90°C for 60 min to obtain a prepolymer, then add 2.5 parts of chain extender triethanolamine, and react at 85°C for 50 min to obtain the PUR moisture curing type hot melt adhesive.

[0058] (3) The PUR moisture curing type hot melt adhesive obtained in step (2) is used to compound the polyethylene non-woven fabric obtained in step (1) with 20D nylon warp-knitted fabric. During the compounding process, the temperature of the PUR moisture curing type hot melt adhesive is increased to 95°C, and the adhesive is spot-coated on the polyethylene non-woven fabric (the amount is 8g / m 2 ). Then, the 20D nylon warp-knitted fabric is laminated with the polyethylene non-woven fabric, and then the temperature is decreased to 65°C and kept for 10 min at a cooling rate of 3°C / min. Finally, the temperature is decreased to room temperature naturally to obtain the polyethylene non-woven fabric two-in-one composite fabric.

[0059] Example 4

[0060] The present embodiment provides a polyethylene non-woven fabric two-in-one composite fabric, which is prepared by the following method:

[0061] (1) The waste high-density polyethylene is washed, melted at 145°C and ground, and then extruded and granulated by an extruder to obtain a recycled polyethylene masterbatch, which is mixed with a solvent to prepare a spinning solution, and then spun, laid, hot pressed to obtain a polyethylene non-woven fabric with a grammage of about 60 g / m 2 .

[0062] (2) 70 parts of dehydrated polyols (rosin polyester polyol, cashew nut shell oil polyether polyol NX-9212 and castor oil polyester polyol with a mass ratio of 1:4:1) and 50 parts of toluene diisocyanate are mixed, 1 part of dibutyltin dilaurate is added, and the mixture is reacted at 90°C for 60 min to obtain a prepolymer, then 2.5 parts of triethanolamine is added as a chain extender, and the mixture is reacted at 85°C for 50 min to obtain a PUR moisture-curable hot melt adhesive.

[0063] (3) The polyethylene non-woven fabric obtained in step (1) is compounded with 20D warp-knitted nylon fabric by using the PUR moisture-curable hot melt adhesive obtained in step (2), and during the compounding process, the temperature of the PUR moisture-curable hot melt adhesive is increased to 95°C, and the adhesive is spot-coated on the polyethylene non-woven fabric (the amount is 8 g / m 2 ), then the 20D warp-knitted nylon fabric is laminated with the polyethylene non-woven fabric, and then the temperature is decreased to 65°C and kept for 10 min, the cooling rate is 3°C / min, and finally the temperature is decreased to room temperature naturally, thereby obtaining a polyethylene non-woven fabric two-in-one composite fabric.

[0064] Example 5

[0065] The present embodiment provides a polyethylene non-woven fabric two-in-one composite fabric, which is prepared by the following method:

[0066] (1) The waste high-density polyethylene is washed, melted at 140°C and ground, and then extruded and granulated by an extruder to obtain a recycled polyethylene masterbatch, which is mixed with a solvent to prepare a spinning solution, and then spun, laid, hot pressed to obtain a polyethylene non-woven fabric with a grammage of about 60 g / m 2 .

[0067] (2) 60 parts of dehydrated polyols (rosin polyester polyol, cashew nut shell oil polyether polyol NX-9212 and castor oil polyester polyol with a mass ratio of 1:3:0.4) and 45 parts of toluene diisocyanate are mixed, 0.4 parts of dibutyltin dilaurate is added, and the mixture is reacted at 80°C for 60 min to obtain a prepolymer, then 2 parts of diethanolamine is added as a chain extender, and the mixture is reacted at 70°C for 50 min to obtain a PUR moisture-curable hot melt adhesive.

[0068] (3) 100 parts of polyvinyl butyral (butyral degree 68%) is mixed with 15 parts of benzoic acid, 0.01 parts of antioxidant tris(dipropylene glycol) phosphite, 1 part of octenyl succinic anhydride, 0.05 parts of catalyst N,N-dimethyl benzylamine is added to react, extruder extrusion granulation to obtain modified polyvinyl butyral, then the modified polyvinyl butyral is dispersed in water to prepare an impregnation solution with a mass fraction of greater than or equal to 20%, then the polyethylene non-woven fabric obtained in step (1) and the warp-knitted nylon fabric are immersed in the impregnation solution for treatment, the treatment temperature is 40°C, and the treatment time is 2h, and then the treated fabric is dried.

[0069] (4) The polyethylene non-woven fabric obtained in step (3) is compounded with the 20D warp-knitted nylon fabric by using the PUR moisture-curing hot melt adhesive obtained in step (2), during the compounding process, the temperature of the PUR moisture-curing hot melt adhesive is increased to 90°C, and the PUR moisture-curing hot melt adhesive is spot-coated on the polyethylene non-woven fabric (the amount is 6g / m 2 ), then the 20D warp-knitted nylon fabric is laminated with the polyethylene non-woven fabric, then the temperature is decreased to 60°C and kept for 5min, the cooling rate is 1°C / min, and finally the temperature is decreased to room temperature naturally, thereby obtaining a polyethylene non-woven fabric two-in-one composite fabric.

[0070] Example 6

[0071] The embodiment provides a polyethylene non-woven fabric two-in-one composite fabric, which is different from that in example 5 in that the preparation step of the modified polyvinyl butyral is as follows: 100 parts of polyvinyl butyral (butyral degree 68%) is mixed with 20 parts of benzoic acid, 0.01 parts of antioxidant tris(dipropylene glycol) phosphite, 3 parts of octenyl succinic anhydride, 0.05 parts of catalyst N,N-dimethyl benzylamine is added to react, and extruder extrusion granulation is used to obtain the modified polyvinyl butyral.

[0072] Example 7

[0073] The embodiment provides a polyethylene non-woven fabric two-in-one composite fabric, which is different from that in example 5 in that the preparation step of the modified polyvinyl butyral is as follows: 100 parts of polyvinyl butyral (butyral degree 70%) is mixed with 10 parts of benzoic acid, 0.1 parts of antioxidant diphenyl isodecyl phosphite, 1 part of octenyl succinic anhydride, 0.1 parts of catalyst dibutyl tin dilaurate is added to react, and extruder extrusion granulation is used to obtain the modified polyvinyl butyral.

[0074] Example 8

[0075] The embodiment provides a polyethylene non-woven fabric two-in-one composite fabric, which is different from the embodiment 5 in that the modified polyvinyl butyral is prepared according to the following steps: 100 parts of polyvinyl butyral (butyral degree 70%) is uniformly mixed with 25 parts of benzoic acid, 0.1 part of antioxidant diphenyl isodecyl phosphite and 5 parts of octenyl succinic anhydride, 0.1 part of catalyst dibutyl tin dilaurate is added for reaction, and extruder extrusion granulation is conducted to obtain the modified polyvinyl butyral.

[0076] Embodiment 9

[0077] The embodiment provides a polyethylene non-woven fabric two-in-one composite fabric, which is different from the embodiment 5 in that the modified polyvinyl butyral is prepared according to the following steps: 100 parts of polyvinyl butyral (butyral degree 70%) is uniformly mixed with 16 parts of benzoic acid and 0.1 part of antioxidant diphenyl isodecyl phosphite, 0.1 part of catalyst dibutyl tin dilaurate is added for reaction, and extruder extrusion granulation is conducted to obtain the modified polyvinyl butyral.

[0078] Embodiment 10

[0079] The embodiment provides a polyethylene non-woven fabric two-in-one composite fabric, which is different from the embodiment 5 in that the modified polyvinyl butyral is prepared according to the following steps: 100 parts of polyvinyl butyral (butyral degree 70%) is uniformly mixed with 2 parts of octenyl succinic anhydride and 0.1 part of antioxidant diphenyl isodecyl phosphite, 0.1 part of catalyst dibutyl tin dilaurate is added for reaction, and extruder extrusion granulation is conducted to obtain the modified polyvinyl butyral.

[0080] Embodiment 11

[0081] The embodiment provides a polyethylene non-woven fabric two-in-one composite fabric, which is different from the embodiment 5 in that the modified polyvinyl butyral is replaced by an equal amount of polyvinyl butyral (butyral degree 70%).

[0082] Comparative example 1

[0083] The comparative example provides a polyethylene non-woven fabric two-in-one composite fabric, which is prepared according to basically the same method as in the embodiment 2, and is different from the embodiment 2 only in that the PUR moisture curing type hot melt adhesive is prepared according to the following method: 60 parts of dehydrated polyol (mass ratio 1:1:0.1 of rosin polyester polyol, cashew nut shell oil polyether polyol and castor oil polyester polyol), 45 parts of toluene diisocyanate are mixed, 0.4 parts of dibutyl tin dilaurate is added, reaction is carried out at 80 DEG C for 60 min to obtain a prepolymer, then 2 parts of chain extender diethanolamine is added, and reaction is carried out at 70 DEG C for 50 min, so as to obtain the PUR moisture curing type hot melt adhesive.

[0084] Comparative example 2

[0085] The comparative example provides a polyethylene non-woven fabric two-in-one composite fabric, and the preparation method thereof is basically the same as that of example 2, except that the PUR moisture-curable hot melt adhesive is prepared by the following method: 60 parts of dehydrated polyol (mass ratio 1:3.5 of rosin polyester polyol and cashew nut shell oil polyether polyol), 45 parts of toluene diisocyanate are mixed, 0.4 parts of dibutyltin dilaurate is added, and the pre-polymer is obtained by reacting at 80℃ for 60 min, then 2 parts of chain extender diethanolamine is added, and the reaction is carried out at 70℃ for 50 min, to obtain the PUR moisture-curable hot melt adhesive.

[0086] Comparative example 3

[0087] The comparative example provides a polyethylene non-woven fabric two-in-one composite fabric, and the preparation method thereof is basically the same as that of example 2, except that the PUR moisture-curable hot melt adhesive is prepared by the following method: 60 parts of dehydrated polyol (mass ratio 1:3.5 of rosin polyester polyol and cashew nut shell oil polyether polyol), 45 parts of toluene diisocyanate are mixed, 0.4 parts of dibutyltin dilaurate is added, and the pre-polymer is obtained by reacting at 80℃ for 60 min, then 2 parts of chain extender diethanolamine is added, and the reaction is carried out at 70℃ for 50 min, to obtain the PUR moisture-curable hot melt adhesive.

[0088] Comparative example 4

[0089] The comparative example provides a polyethylene non-woven fabric two-in-one composite fabric, and the preparation method thereof is basically the same as that of example 2, except that the PUR moisture-curable hot melt adhesive is prepared by the following method: 60 parts of dehydrated polyol (mass ratio 1:3.5 of rosin polyester polyol and cashew nut shell oil polyether polyol), 45 parts of toluene diisocyanate are mixed, 0.4 parts of dibutyltin dilaurate is added, and the pre-polymer is obtained by reacting at 80℃ for 60 min, then 2 parts of chain extender diethanolamine is added, and the reaction is carried out at 70℃ for 50 min, to obtain the PUR moisture-curable hot melt adhesive.

[0090] Comparative example 5

[0091] The comparative example provides a polyethylene non-woven fabric two-in-one composite fabric, and the preparation method thereof is basically the same as that of example 2, except that the polyethylene non-woven fabric is compounded with 20D nylon warp-knitted fabric, and the PUR moisture-curable hot melt adhesive is heated to 90℃ and spot-coated on the polyethylene non-woven fabric (the amount is 6g / m 2 ), the 20D nylon warp-knitted fabric is laminated with the polyethylene non-woven fabric, and finally cooled to room temperature under natural conditions, to obtain the polyethylene non-woven fabric two-in-one composite fabric.

[0092] Test example

[0093] The fabric prepared in the above Examples 1-11 and Comparative Examples 1-5 was subjected to the following tests:

[0094] 1. Breaking strength: tested according to GB / T 3923.1-2013. The results are shown in Table 1 below.

[0095] Table 1. Breaking strength of the fabric

[0096]

[0097] From the data in the table, it can be seen that the breaking strength of the polyethylene non-woven fabric two-in-one composite fabric obtained by the application is high, and the transverse and longitudinal strength can be up to more than 240 N / 5 cm. As can be seen from Examples 5 and 6, the surface treatment of the polyethylene non-woven fabric and the knitted fabric helps to further enhance the strength of the fabric.

[0098] 2. Anti-pilling performance

[0099] According to GB / T4802.1-2008 "Determination of the Pilling Behavior of Textile - Part 1: Circular Track Method", the pilling behavior of the fabric was tested, and the specific evaluation method was as follows:

[0100] Level 5: no change.

[0101] Level 4: slight fuzzing and / or slight pilling on the surface.

[0102] Level 3: moderate fuzzing and / or moderate pilling on the surface, with different sizes and densities of balls covering part of the surface of the sample.

[0103] Level 2: obvious fuzzing and / or pilling on the surface, with different sizes and densities of balls covering most of the surface of the sample.

[0104] Level 1: severe fuzzing and / or pilling on the surface, with different sizes and densities of balls covering the entire surface of the sample.

[0105] The fabric was hung to dry according to the washing program 4N and drying program A in GB / T8629-2017 "Test Household Washing and Drying Procedures", and the pilling and fuzzing behavior after 15 times of washing was tested, and the evaluation method referred to the above friction pilling and fuzzing evaluation method.

[0106] The results are shown in Table 2 below.

[0107] Table 2. Anti-pilling and anti-fuzzing performance of the fabric

[0108] Group Anti-friction pilling rating Anti-washing pilling rating Example 1 4-5 4-5 Example 2 4-5 4-5 Example 3 4-5 4-5 Example 4 4-5 4-5 Example 5 5 5 Example 6 5 5 Example 7 4 4 Example 8 4 4 Example 9 3 3 Example 10 3-4 2-3 Example 11 3 2-3 Comparative Example 1 4-5 4-5 Comparative Example 2 4-5 5 Comparative Example 3 4-5 4-5 Comparative Example 4 4 4-5 Comparative Example 5 4 4

[0109] The higher the anti-pilling grade is, the better the anti-pilling property of the fabric is. From the data in the table, it can be seen that the anti-pilling grade of the polyethylene non-woven fabric two-in-one composite fabric obtained by the application can reach 4 or more, and the anti-pilling property is good. It can be seen from Examples 2 and 5-11 that the polyvinyl butyral in Comparative Example 11 is not modified, and the anti-pilling grade of the obtained fabric is only 3, and the anti-pilling grade of the fabric after washing is 2-3, which is obviously worse than Example 2, while the anti-pilling property of Examples 5 and 6 is better than Example 2, which shows that the surface treatment with modified PVB helps to enhance the anti-pilling property of the fabric. It can be seen from Examples 2 and Comparative Examples 1-5 that the anti-pilling grade of the fabric obtained in Comparative Examples 1-5 is comparable to that of Example 2, which shows that the PUR moisture-curable hot melt adhesive and the temperature conditions during the fabric compounding process have no significant effect on the anti-pilling property of the fabric.

[0110] 3. Bonding property

[0111] According to GB-T2791-1995 "Adhesive T-peel strength test method flexible material to flexible material", the peel strength after curing for 5 minutes and 2 days was tested, and the test results are shown in Table 3 below.

[0112] The fabric was taken out after aging for 7 days in a constant temperature and humidity test chamber with a temperature of 85°C and a humidity of 85% RH, and the changes were observed, and the peel strength was tested to calculate the strength retention rate. The test results are shown in Table 4 below.

[0113] Table 3. Bonding property

[0114]

[0115]

[0116] From the data in the table, it can be seen that the peel strength of the fabric compounded by the PUR moisture-curable hot melt adhesive provided by the application reaches 1.3 MPa or more after curing for 5 minutes, and reaches 8.5 MPa or more after curing for 2 days, which shows that the PUR moisture-curable hot melt adhesive provided by the application has fast curing speed and good bonding property. The formulations of the PUR moisture-curable hot melt adhesives in Comparative Examples 1-4 are different from that of Example 2, and the peel strength of the obtained fabric whether 5 minutes or 2 days is significantly lower than that of Example 2, which shows that in the preparation process of the PUR moisture-curable hot melt adhesive, using rosin polyester polyol, cashew shell oil polyether polyol and castor oil polyester polyol as polyol can significantly improve the bonding property of the PUR moisture-curable hot melt adhesive and the compounding strength of the fabric. The peel strength of Comparative Example 5 is lower than that of Example 2, which shows that controlling the temperature conditions during the compounding process helps to improve the bonding property.

[0117] Table 4. Moisture and heat aging resistance

[0118]

[0119]

[0120] The fabric obtained in Examples 1-4 did not show bubble and peeling phenomenon, and had no obvious change after aging at 85℃ and 85%RH for 7 days. According to the data shown in Table 4, the peel strength retention rate of the fabric obtained in Examples 1-4 was more than 90% after aging, and the peel strength was high, which indicated that the PUR moisture curing hot melt adhesive provided in the application had excellent moisture and heat aging resistance. The peel strength of the fabric obtained in Comparative Examples 1-4 was only retained at 70-80% after aging, and the peel strength decreased obviously, and the fabric of Comparative Examples 3 and 4 showed the phenomenon of edge lifting, which indicated that using rosin polyester polyol, cashew shell oil polyether polyol and castor oil polyester polyol as polyol in the preparation of PUR moisture curing hot melt adhesive could significantly improve the moisture and heat aging resistance of the PUR moisture curing hot melt adhesive. The peel strength of the fabric obtained in Comparative Example 5 was also lower than that of Example 2 after aging, which indicated that controlling the temperature condition of the lamination curing process also had a certain effect on improving the moisture and heat aging resistance.

[0121] The above description of the examples is for the purpose of enabling a person of ordinary skill in the art to understand and use the application. Those skilled in the art can easily make various modifications to these examples, and apply the general principles described herein to other examples without inventive labor. Therefore, the application is not limited to the above examples, and improvements and modifications made by those skilled in the art based on the disclosure of the application without departing from the scope of the application should be within the protection scope of the application.

Claims

1. A polyethylene nonwoven fabric two-in-one composite fabric, characterized by, The polyethylene non-woven fabric and the 20D polyamide warp-knitted fabric are bonded by using the PUR moisture-curing hot melt adhesive. The polyol in the PUR moisture-curing hot melt adhesive comprises rosin polyester polyol, cashew nut shell oil polyether polyol and castor oil polyester polyol. In the PUR moisture-curing hot melt adhesive, the amount of cashew nut shell oil polyether polyol in the polyol is greater than or equal to 2 times and less than or equal to 4 times the amount of rosin polyester polyol, and the amount of castor oil polyester polyol is greater than or equal to 0.2 times and less than or equal to 1 times the amount of rosin polyester polyol.

2. The polyethylene nonwoven fabric two-in-one composite fabric according to claim 1, characterized by, The polyethylene non-woven fabric is prepared by flash spinning of recycled polyethylene, and the polyethylene non-woven fabric has a grammage greater than or equal to 50 g / m 2 and less than or equal to 65 g / m 2 .

3. The polyethylene nonwoven fabric two-in-one composite fabric according to claim 1, characterized by, In the PUR moisture-curing hot melt adhesive, the amount of cashew nut shell oil polyether polyol in the polyol is greater than or equal to 3 times and less than or equal to 3.5 times the amount of rosin polyester polyol, and the amount of castor oil polyester polyol is greater than or equal to 0.4 times and less than or equal to 0.6 times the amount of rosin polyester polyol.

4. The polyethylene nonwoven fabric two-in-one composite fabric according to claim 1, wherein The PUR moisture-curing hot melt adhesive comprises the following raw materials by weight: polyol greater than or equal to 50 parts and less than or equal to 70 parts, diisocyanate greater than or equal to 40 parts and less than or equal to 50 parts, chain extender greater than or equal to 1 part and less than or equal to 3 parts, antioxidant greater than or equal to 1 part and less than or equal to 3 parts, and catalyst greater than or equal to 0.3 parts and less than or equal to 1 part.

5. The polyethylene nonwoven fabric two-in-one composite fabric according to any one of claim 4, characterized by, The PUR moisture-curing hot melt adhesive is prepared by the following method: The polyol and the diisocyanate are dehydrated, then the catalyst is added for reaction, the reaction temperature is greater than or equal to 80°C and less than or equal to 90°C, the reaction time is greater than or equal to 30 min and less than or equal to 60 min, a prepolymer is obtained, then the chain extender is added for reaction at a temperature greater than or equal to 70°C and less than or equal to 85°C, the reaction time is greater than or equal to 20 min and less than or equal to 50 min, finally the curing agent is added for stirring at a temperature greater than or equal to 50°C and less than or equal to 60°C, the stirring time is greater than or equal to 10 min and less than or equal to 30 min, and the PUR moisture-curing hot melt adhesive is obtained.

6. The method of producing the polyethylene nonwoven fabric two-in-one composite fabric according to any one of claims 1 to 5, characterized by, The process comprises the following steps: The waste high-density polyethylene is washed, high-temperature melted and ground, extruded and pelletized by an extruder to obtain a recycled polyethylene masterbatch, then the recycled polyethylene masterbatch is mixed with a solvent to prepare a spinning solution, the spinning solution is spun, laid, hot-pressed to obtain a polyethylene non-woven fabric, and then the polyethylene non-woven fabric is compounded with the polyamide warp-knitted fabric by using the PUR moisture-curing hot melt adhesive, and the polyethylene non-woven fabric two-in-one composite fabric is obtained.

7. The production method according to claim 6, wherein In the compounding process, the PUR moisture-curing hot melt adhesive is heated to a temperature greater than or equal to 90°C and less than or equal to 95°C, and is spot-coated on the polyethylene non-woven fabric, then the polyamide warp-knitted fabric is bonded with the polyethylene non-woven fabric, and then the temperature is lowered to a temperature greater than or equal to 60°C and less than or equal to 65°C and is kept for a certain time, the cooling rate is greater than or equal to 1°C / min and less than or equal to 3°C / min, the keeping time is greater than or equal to 5 min and less than or equal to 10 min, and finally the temperature is lowered to room temperature under natural conditions, and the polyethylene non-woven fabric two-in-one composite fabric is obtained.

8. The preparation method according to claim 6, characterized in that, The polyethylene non-woven fabric and the warp-knitted nylon fabric are further subjected to an impregnation treatment with modified polyvinyl butyral before being combined. The impregnation treatment step comprises: mixing PVB with benzoic acid, octenyl succinic anhydride and an antioxidant, adding a catalyst for reaction, extruding and granulating by an extruder to obtain modified polyvinyl butyral, then dispersing the modified polyvinyl butyral into water to prepare an impregnation solution with a mass fraction of greater than or equal to 20% and less than or equal to 30%, and then impregnating the polyethylene non-woven fabric and the warp-knitted nylon fabric in the impregnation solution, wherein the temperature of the impregnation treatment is greater than or equal to 40℃ and less than or equal to 50℃, and the time of the impregnation treatment is greater than or equal to 0.5h and less than or equal to 2h.

9. Use of the polyethylene non-woven fabric two-in-one composite fabric according to any one of claims 1-5 in clothing fabric and packaging bags.

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