Non-woven material with softness, strength and air permeability as well as preparation method and application of non-woven material

Abstract

The invention relates to a non-woven material with softness, strength and air permeability as well as a preparation method and application of the non-woven material. The non-woven material is prepared from the following components in parts by weight: 65 to 68 parts of modified homo-polypropylene, 32 to 35 parts of co-polypropylene, 9 to 10 parts of olefin-based elastomer and 1.9 to 2.1 parts of softening agent. The modified homo-polypropylene and the co-polypropylene are compounded, the olefin-based elastomer and the softening agent are added, and all the components have a synergistic effect, so that the obtained non-woven material has high softness, high strength and high air permeability, is very soft and fluffy in touch feeling, more comfortable in body feeling, free of constraint feeling and high in spinnability, and can be widely applied to the field of non-woven fabrics. The paper diaper is very suitable for being used on the waistline of the paper diaper.

Description

Technical Field

[0001] The invention relates to the technical field of nonwoven materials, and relates to a nonwoven material and a preparation method and application thereof, and in particular to a nonwoven material having softness, strength and air permeability and a preparation method and application thereof. Background Art

[0002] Traditional non-woven materials are mostly made of homopolymer polyethylene, elastomeric materials, softeners and white masterbatch as raw material components. When such raw materials are used in disposable underwear, the resulting product has poor elasticity, is prone to pilling, has poor air permeability, and has poor softness and mechanical strength. It feels bad when used and cannot meet people's daily needs.

[0003] CN113981614A discloses a high-elasticity disposable non-woven underwear, including an underwear body made of melt-blown non-woven fabric, wherein the melt-blown non-woven fabric is made of the following raw materials in parts by weight: 40-65 parts of modified polyethylene terephthalate, 15-25 parts of polypropylene, 10-28 parts of polyether polyurethane, 2-8 parts of calcium carbonate powder, and 2-5 parts of a compatibilizer; and also discloses a method for preparing a high-elasticity disposable non-woven underwear: the melt-blown non-woven fabric made of the above raw materials is cut and glued to form a high-elasticity disposable non-woven underwear. By adopting the above technical solution, the disposable non-woven underwear has a good elastic effect.

[0004] CN117552184A discloses a composite structure of spunlace nonwoven fabric for the surface layer of diapers, including a first fiber web and a second fiber web entangled by spunlace, wherein the first fiber web is a bicomponent fiber of a high shrinkage polyester (HSPET) / modified polypropylene parallel structure, and the second fiber web is a bamboo pulp fiber; the modified polypropylene is maleimide grafted modified polypropylene. The invention reinforces the first fiber web layer and the second fiber web layer by a spunlace process to obtain a spunlace nonwoven fabric for the surface layer of the diaper; the hydrophilic and hydrophobic difference of the two fiber web layers is large enough to form a differential capillary effect, so as to achieve the unidirectional water conduction of the material with softness and skin-friendliness.

[0005] However, the nonwoven fabric prepared as above cannot meet the requirements of high softness, high strength and high air permeability at the same time. Therefore, it is necessary to develop a nonwoven material with high softness, high mechanical strength and good air permeability to further improve the usability of the material. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a nonwoven material and a preparation method and application thereof, in particular, a nonwoven material having both softness, strength and air permeability and a preparation method and application thereof. The present invention uses modified homopolypropylene and copolymer polypropylene for compounding, and at the same time adds olefin-based elastomer and softener, and various components synergistically enhance the effect, so that the obtained nonwoven material has both high softness, high strength and high air permeability, feels very soft and fluffy, feels more comfortable, has no sense of restraint, and has high spinnability, which is very suitable for use on the waist of diapers.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a nonwoven material, comprising, by weight: 65-68 parts of modified homopolypropylene, 32-35 parts of copolymer polypropylene, 9-10 parts of olefin-based elastomer and 1.9-2.1 parts of softener.

[0009] In the present invention, the amount of modified homopolypropylene can be, for example, 65 parts, 65.5 parts, 66 parts, 66.5 parts, 67 parts, 67.5 parts, 68 parts, etc.; the amount of copolymer polypropylene can be, for example, 32 parts, 32.5 parts, 33 parts, 33.5 parts, 34 parts, 34.5 parts, 35 parts, etc.; the amount of olefin-based elastomer can be, for example, 9 parts, 9.2 parts, 9.4 parts, 9.6 parts, 9.8 parts, 10 parts, etc.; the amount of softener can be, for example, 1.9 parts, 1.95 parts, 2 parts, 2.05 parts, 2.1 parts, etc.

[0010] Firstly, the present invention selects homopolypropylene and copolymer polypropylene for combination, both of which are non-polar polymers with good compatibility. The combination can effectively bring into play the advantages of the two, so that the obtained nonwoven material can have both high softness and high strength; on the basis of the compounding of the two, the modified homopolypropylene is further used, so that the nonwoven material can also have a higher air permeability effect.

[0011] Secondly, toughening with olefin-based elastomers can not only further improve the softness of the resulting nonwoven material, but also enhance the chemical resistance of the nonwoven material.

[0012] In summary, the present invention uses the above-mentioned material components in combination to make the resulting non-woven material have high softness, high strength and high air permeability, feel very soft and fluffy, feel more comfortable to the body, without any sense of restraint, and at the same time have high spinnability, which is very suitable for use on the waistline of diapers.

[0013] Preferably, the modified homopolypropylene is obtained by treating homopolypropylene with a modifier.

[0014] Preferably, the modifier comprises any one of sodium alginate, polyethylene glycol and activated carbon or a combination of at least two thereof, preferably a combination of sodium alginate, polyethylene glycol and activated carbon.

[0015] The present invention introduces more pore structures into homopolypropylene by modifying it, thereby improving the air permeability of the obtained nonwoven material. When a compound combination of sodium alginate, polyethylene glycol and activated carbon is selected at the same time, the viscosity and fluidity of the homopolypropylene can be synergistically improved, thereby improving the overall comfort of the material.

[0016] Preferably, the mass ratio of the sodium alginate, polyethylene glycol and activated carbon is 1:(0.8-1.2):(0.8-1.2), and the above (0.8-1.2) can be, for example, 0.8, 0.9, 1, 1.1, 1.2, etc.

[0017] Preferably, the mass ratio of the homopolypropylene to the modifier is 1:(0.2-0.4), for example, it can be 1:0.2, 1:0.25, 1:0.3, 1:0.35, 1:0.4, etc.

[0018] Preferably, the olefin-based elastomer includes a propylene-based elastomer.

[0019] Preferably, the mass percentage of ethylene in the propylene-based elastomer is 13-15%, for example, it can be 13%, 13.5%, 14%, 14.5%, 15%, etc.

[0020] Preferably, the softener comprises an erucamide softener.

[0021] Preferably, the nonwoven material further comprises white masterbatch.

[0022] Preferably, the nonwoven material further comprises 0.85-0.95 parts by weight of white masterbatch, for example, 0.85, 0.86, 0.88, 0.9, 0.92, 0.94, 0.95, etc.

[0023] In a second aspect, the present invention provides a method for preparing the nonwoven material according to the first aspect, the preparation method comprising:

[0024] The modified homopolypropylene, copolymer polypropylene, olefin-based elastomer, softener and optional white masterbatch are mixed, heated and melted for plasticization, extruded through holes, cooled and stretched to form a fabric surface, and then reinforced and formed by pre-pressing and thermal bonding to obtain the nonwoven material.

[0025] In a third aspect, the present invention provides a use of the nonwoven material according to the first aspect in underwear.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] The present invention uses modified homopolymer polypropylene and copolymer polypropylene for compounding, and at the same time adds olefin-based elastomer and softener. Various components synergistically enhance the effect, so that the obtained non-woven material has high softness, high strength and high air permeability, is very soft and fluffy to the touch, is more comfortable to the body, has no sense of restraint, and has high spinnability, and is very suitable for use on the waistline of diapers. DETAILED DESCRIPTION

[0028] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0029] The sources of materials used in the following examples and comparative examples are as follows:

[0030] Homopolymer polypropylene: brand name is PPH-Y40, the manufacturer is China Petrochemical Corporation;

[0031] Copolymer polypropylene: brand name is H39S-2, manufactured by China Petrochemical Corporation;

[0032] Propylene-based elastomer: brand 7020BF, manufacturer ExxonMobil;

[0033] Erucic acid amide softener: brand name is SF006, manufacturer is Foshan Baole Import and Export Trading Co., Ltd.;

[0034] White masterbatch: brand number 668, manufacturer is Foshan Baole Import and Export Trading Co., Ltd.

[0035] Polyethylene glycol: weight average molecular weight 2000;

[0036] Activated carbon: particle size 400 mesh.

[0037] Example 1

[0038] The present embodiment provides a nonwoven material, which comprises, by weight: 65 parts of modified homopolypropylene, 35 parts of copolymer polypropylene, 9 parts of olefin-based elastomer, 1.9 parts of softener and 0.85 parts of white masterbatch; wherein the modified homopolypropylene is prepared by mixing homopolypropylene and a modifier (sodium alginate, polyethylene glycol and activated carbon in a mass ratio of 1:1:1) in a mass ratio of 1:0.3, stirring and melt-extruding.

[0039] The preparation method of the nonwoven material comprises the following steps:

[0040] The above raw materials are mixed in proportion to obtain a mixture; the upper roller temperature and the lower roller temperature of the sealing roller are adjusted to 150°C, the rolling mill temperature of the hot rolling mill is adjusted to 160°C, the suction volume of the suction fan is adjusted to 870slm, and the cold air is adjusted to 880slm; the mixture is heated and melted by a screw extruder to be plasticized, and is accurately metered and delivered to a die head (the temperature of the die head is 220°C) by a metering pump, and the melt is uniformly extruded through holes, and enters a stretcher after being cooled by cooling air, and the filaments are sucked into the stretcher under the negative pressure of the stretcher, and a cloth surface is formed under the auxiliary action of the suction fan, and the cloth surface is reinforced and formed by a pre-pressing treatment of the sealing roller and a thermal bonding treatment of the hot rolling mill to obtain the non-woven material.

[0041] Example 2

[0042] The present embodiment provides a nonwoven material, which comprises, by weight: 66 parts of modified homopolypropylene, 34 parts of copolymer polypropylene, 9.4 parts of olefin-based elastomer, 2 parts of softener and 0.88 parts of white masterbatch; wherein the modified homopolypropylene is prepared by mixing homopolypropylene and a modifier (sodium alginate, polyethylene glycol and activated carbon in a mass ratio of 1:0.8:1.2) in a mass ratio of 1:0.2, stirring and melt extruding.

[0043] The preparation method is as in Example 1.

[0044] Example 3

[0045] The present embodiment provides a nonwoven material, which comprises, by weight: 67 parts of modified homopolypropylene, 33 parts of copolymer polypropylene, 9.6 parts of olefin-based elastomer, 2.05 parts of softener and 0.92 parts of white masterbatch; wherein the modified homopolypropylene is prepared by mixing homopolypropylene and a modifier (sodium alginate, polyethylene glycol and activated carbon in a mass ratio of 1:1.2:0.8) in a mass ratio of 1:0.4, stirring and melt extruding.

[0046] The preparation method is as in Example 1.

[0047] Example 4

[0048] The present embodiment provides a nonwoven material, which comprises, by weight: 68 parts of modified homopolypropylene, 32 parts of copolymer polypropylene, 10 parts of olefin-based elastomer, 2.1 parts of softener and 0.95 parts of white masterbatch; wherein the modified homopolypropylene is prepared by mixing homopolypropylene and a modifier (sodium alginate, polyethylene glycol and activated carbon in a mass ratio of 1:1:1) in a mass ratio of 1:0.3, stirring and melt-extruding.

[0049] The preparation method is as in Example 1.

[0050] Example 5

[0051] This embodiment provides a nonwoven material, which is different from the embodiment 1 only in that the modifier is sodium alginate and polyethylene glycol in a mass ratio of 1:1. The rest is with reference to the embodiment 1.

[0052] Example 6

[0053] This embodiment provides a nonwoven material, which is different from the embodiment 1 only in that the modifier is sodium alginate and activated carbon in a mass ratio of 1:1, and the rest is with reference to the embodiment 1.

[0054] Example 7

[0055] This embodiment provides a nonwoven material, which is different from the embodiment 1 only in that the modifier is polyethylene glycol and activated carbon in a mass ratio of 1:1, and the rest is with reference to the embodiment 1.

[0056] Comparative Example 1

[0057] This comparative example provides a nonwoven material, which is different from Example 1 only in that the modified homopolypropylene is replaced by an equal amount of homopolypropylene, that is, unmodified homopolypropylene is used. The rest is as in Example 1.

[0058] Comparative Example 2

[0059] This comparative example provides a nonwoven material, which is different from Example 1 only in that it does not contain copolymerized polypropylene, and its usage is distributed to modified homopolymerized polypropylene. The rest is reference to Example 1.

[0060] Test Example 1

[0061] (1) Weight: Tested in accordance with ASTM D3776-2017 "Standard Test Method for Mass per Unit Area (Weight) of Textiles";

[0062] (2) Mechanical properties: The transverse tensile breaking strength, transverse elongation, longitudinal tensile breaking strength and longitudinal elongation were tested in accordance with ASTM D5035-2011 “Test Method for Breaking Strength and Elongation of Textiles (Strip Method)”.

[0063] (3) Softness: According to GB / T 8942-2016 “Determination of paper softness”, longitudinal softness and transverse softness;

[0064] (4) Air permeability test: According to GB / T 5453-1997 Determination of air permeability of fabrics, the air permeability of soft non-woven fabrics was tested using an automatic air permeability meter.

[0065] The products provided in the above embodiments and comparative examples were tested, and the results are shown in Table 1.

[0066] Table 1

[0067]

[0068] The test results show that:

[0069] (1) It can be seen from Examples 1 to 6 that the nonwoven material provided by the present invention has a transverse tensile breaking strength of 13.05-15.79 N / 5 cm, a longitudinal tensile breaking strength of 22.97-33.43 N / 5 cm, a transverse elongation of 100.51-127.24%, a longitudinal elongation of 77.14-108.58%, a transverse softness of 22-30 mN, a longitudinal softness of 17-23 mN, and an air permeability of 1965-1990 mm·s -1 , combining high softness, high strength and high air permeability.

[0070] (2) By comparing Example 1 with Examples 5-6, it can be seen that the present invention can further improve the air permeability effect while ensuring high softness and strength by further compounding the modified homopolymer polypropylene modifier.

[0071] (3) By comparing Example 1 with Comparative Example 1, it can be seen that the present invention adopts modified homopolypropylene and compounds it with copolymer polypropylene, and the resulting nonwoven material has better softness, strength and breathability.

[0072] By comparing Example 1 with Comparative Example 2, it can be seen that if copolymerized polypropylene is not added, the softness of the obtained nonwoven material decreases.

[0073] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A nonwoven material, characterized in that The nonwoven material comprises, by weight: 65-68 parts of modified homopolypropylene, 32-35 parts of copolymerized polypropylene, 9-10 parts of olefin-based elastomer and 1.9-2.1 parts of softener.

2. The nonwoven material according to claim 1, characterized in that The modified homopolypropylene is obtained by treating homopolypropylene with a modifier; Preferably, the modifier comprises any one or a combination of at least two of sodium alginate, polyethylene glycol and activated carbon, preferably a combination of sodium alginate, polyethylene glycol and activated carbon; Preferably, the mass ratio of the sodium alginate, polyethylene glycol and activated carbon is 1:(0.8-1.2):(0.8-1.2).

3. The nonwoven material according to claim 2, characterized in that The mass ratio of the homopolymer polypropylene to the modifier is 1:(0.2-0.4).

4. The nonwoven material according to any one of claims 1 to 3, characterized in that The olefin-based elastomer includes a propylene-based elastomer.

5. The nonwoven material according to claim 4, characterized in that The mass percentage of ethylene in the propylene-based elastomer is 13-15%.

6. The nonwoven material according to any one of claims 1 to 5, characterized in that The softener includes an erucamide softener.

7. The nonwoven material according to any one of claims 1 to 6, characterized in that The nonwoven material also includes a white masterbatch.

8. The nonwoven material according to claim 7, characterized in that The nonwoven material further comprises 0.85-0.95 parts by weight of white masterbatch.

9. A method for preparing a nonwoven material according to any one of claims 1 to 8, characterized in that: The preparation method comprises: The modified homopolypropylene, copolymer polypropylene, olefin-based elastomer, softener and optional white masterbatch are mixed, heated and melted for plasticization, extruded through holes, cooled and stretched to form a fabric surface, and then reinforced and formed by pre-pressing and thermal bonding to obtain the nonwoven material.

10. Use of the nonwoven material according to any one of claims 1 to 8 in underwear.

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