Moisture-conducting wear-resistant non-woven fabric for pet urinal pad and preparation method thereof

Abstract

The invention relates to a moisture-conducting wear-resistant non-woven fabric for a pet urinal pad. The moisture-conducting wear-resistant non-woven fabric is formed by spunlace reinforcement of a first fiber web and a second fiber web, the first fiber net is formed by a double-component fiber with a skin-core structure through a spunbond method, a skin layer of the double-component fiber is modified polypropylene, and a core layer of the double-component fiber is polypropylene; the second fiber net is formed by directly laying bamboo pulp fibers; the modified polypropylene is prepared by carrying out melt co-grafting modification on polypropylene through acrylate polyether silane and aromatic unsaturated acyl halide. A wear-resistant, hydrophobic and soft first fiber net is prepared from a skin-core structure two-component fiber formed by modified propylene and polypropylene, and a second fiber net is prepared from a bamboo pulp fiber with good hydrophilicity; the first fiber net and the second fiber net are compounded and then subjected to spunlace reinforcement to form the non-woven fabric, the first fiber net faces upwards during use, the differential capillary effect is formed due to the large hydrophilic-hydrophobic difference of the two fiber nets, and therefore the moisture guiding function is achieved; due to the fact that the first fiber net is resistant to abrasion and soft, abrasion resistance and skin-friendly performance are achieved at the same time.

Description

Technical Field

[0001] The present invention belongs to the technical field of non-woven fabrics, and particularly relates to a moisture-conducting and wear-resistant non-woven fabric for pet urine pads and a preparation method thereof. Background Art

[0002] Non-woven fabric, also known as non-woven cloth, is composed of oriented or random fibers. Due to its good air permeability and softness, it is widely used in the fields of medical and health, industrial and agricultural products, etc. Among them, polypropylene non-woven fabric is widely used due to its light weight and good mechanical properties. However, due to its regular structure and poor softness and skin-friendliness, the application of polypropylene in some fields is limited, such as sanitary napkins, diapers, urine pads, etc. Especially for the non-woven fabric used in pet urine pads, it not only requires good moisture-conducting function to quickly conduct pet urine into the water-absorbing layer to avoid urine leakage; at the same time, because pets such as cats and dogs are easy to scratch and rub the non-woven fabric, in addition to the requirements of moisture-conducting and soft properties, the non-woven fabric for pet urine pads also has relatively high requirements for wear resistance.

[0003] In the prior art, generally, polypropylene is modified or the preparation process is improved to improve the skin-friendly softness of polypropylene. Among them, the method of modifying polypropylene to improve skin-friendly softness is generally to introduce flexible groups, but it often brings about a decrease in hydrophobicity and wear resistance; while improving the preparation process generally has limited effects and complex processes. Patent CN102336961B and patent CN102336929B respectively disclose a heavy calcium carbonate and corn starch-modified PP spunbond non-woven fabric composite material and a corn starch-modified PP spunbond non-woven fabric. The addition of corn starch results in a decrease in the breaking strength of the non-woven fabric and poor wear resistance. Patent 117087299A discloses an ultra-low gram weight and high hydrostatic pressure non-woven fabric and its preparation process. The preparation process includes: preparing a spunbond layer: after mixing the raw materials of the spunbond layer according to the ratio, passing through screw extrusion melting, metering spinning, cold air drawing, and web forming to obtain the spunbond layer; meltblown layer: after mixing the raw materials of the meltblown layer according to the ratio, passing through screw extrusion melting, metering spinning, hot air drawing, and web forming to obtain the meltblown layer; a five-layer fiber web structure of two spunbond layers, two meltblown layers, and one spunbond layer from the outside to the inside, and hot rolling and forming and strengthening the five-layer structure to obtain the SSMMS ultra-low gram weight and high hydrostatic pressure non-woven fabric. The improvement of the raw materials and process of this non-woven fabric endows it with good mechanical properties and strength and has the characteristics of ultra-low gram weight and high hydrostatic pressure, but the improvement of skin-friendly softness is not involved.

[0004] Therefore, it is necessary to develop a non-woven fabric for pet urine pads that takes into account moisture conduction, wear resistance, and softness. Summary of the Invention

[0005] In view of the problems existing in the non-woven fabric for pet urine pads in the prior art, such as insufficient abrasion resistance, and difficulty in balancing moisture conductivity and skin-friendly softness, the present invention provides a moisture-conductive and abrasion-resistant non-woven fabric and its preparation method. In the present invention, modified propylene and polypropylene (PP) are used for bicomponent spinning with a core-sheath structure and spunbonding to form a web, thereby obtaining a first fiber web with good mechanical strength, good hydrophobicity and softness; a second fiber web is directly formed by laying hydrophilic bamboo pulp fibers; then the first fiber web and the second fiber web are hydroentangled to obtain a moisture-conductive and abrasion-resistant non-woven fabric for pet urine pads. The second fiber web of the obtained moisture-conductive and abrasion-resistant non-woven fabric is compounded with a film (such as a PE film) to finally obtain a urine pad for pets. When in use, the first fiber web faces upwards and is in direct contact with the pet. Due to the large difference in hydrophilicity and hydrophobicity between the two fiber webs, a differential capillary effect is formed, which can quickly conduct the pet's urine and other excreta into the second fiber web, thereby avoiding urine leakage, that is, realizing the moisture-conducting function; at the same time, the first fiber web has good mechanical strength and is soft, which can achieve good abrasion resistance and skin-friendly properties.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A moisture-conductive and abrasion-resistant non-woven fabric for pet urine pads is formed by hydroentangling a first fiber web and a second fiber web; the first fiber web is formed by spunbonding of bicomponent fibers with a core-sheath structure, the skin layer of the bicomponent fibers is modified polypropylene, and the core layer is polypropylene; the second fiber web is formed by directly laying bamboo pulp fibers; the modified polypropylene is obtained by melt graft copolymerization of polypropylene with acrylate polyether silane and aromatic unsaturated acyl halide.

[0008] Furthermore, in the preparation of the modified polypropylene, the mass ratio of polypropylene, acrylate polyether silane, and aromatic unsaturated acyl halide is 100:(20 - 35):(3 - 7), preferably 100:(25 - 30):(3 - 5).

[0009] Furthermore, the melt index of the polypropylene is 25 - 40 g / 10 min.

[0010] Furthermore, the acrylate polyether silane is a compound containing acrylate groups, polyether segments and silaneoxy groups, wherein the silaneoxy group is methoxysilane or ethoxysilane, and the number-average molecular weight of the polyether segment is 1000-2000. For example, it is selected from at least one of acrylate-polyethylene glycol 1000-silane (AC-PEG1000-Silane), acrylate-polyethylene glycol 1500-silane (AC-PEG1500-Silane), and acrylate-polyethylene glycol 2000-silane (AC-PEG2000-Silane). When the molecular weight of the polyether segment is too low, the grafted chain is short and the content of introduced silane groups is high, resulting in insufficient flexibility and skin-friendly feeling; when the molecular weight of the polyether segment is too high, the grafted chain is too long, which will affect the fluidity and strength performance.

[0011] Furthermore, the aromatic unsaturated acyl halide is at least one of cinnamoyl chloride, p-styrenesulfonyl chloride, and 4-vinylbenzoyl chloride.

[0012] Furthermore, the modified polypropylene is prepared by the following preparation method: mixing polypropylene chips, acrylate polyether silane, aromatic unsaturated acyl halide and an initiator uniformly, and subjecting them to melt grafting to obtain modified polypropylene.

[0013] Preferably, the initiator is at least one of dicumyl peroxide and di-tert-butyl peroxide, and the dosage of the initiator is 0.1-0.2 wt% of the polypropylene chips; the conditions for the melt grafting are: carried out in a twin-screw extruder, the reaction temperature is 200-220 °C, and the rotation speed is 70-80 r / min. After the reaction is completed, the product is cooled and pelletized to obtain modified polypropylene.

[0014] Furthermore, the core-shell structure is one of concentric type or eccentric type, preferably the concentric type; in the bicomponent fiber of the core-shell structure, the cortex accounts for 10 wt% - 30 wt%.

[0015] Furthermore, the fineness of the bicomponent fiber of the core-shell structure is 1.5-2.5 dtex, the fineness of the bamboo pulp fiber is 1.0-1.5 dtex, and the length is 30-50 mm; the gram weight of the first fiber web is 8-15 g / m 2 , and the gram weight of the second fiber is 15-25 g / m 2 .

[0016] Secondly, the present invention also provides a preparation method of the moisture-conducting and wear-resistant non-woven fabric for pet urine pads, including the following steps:

[0017] (S1) First fiber web: Modified polypropylene and polypropylene are respectively fed into two groups of extruders for heating and melting, and then enter the skin cavity and the core cavity of the composite component of the bicomponent spinning box through a melt filter and a metering pump respectively; composite spinning is carried out at the outlet to form a bicomponent fiber filament with a skin-core structure, and the filament is cooled by side blowing, highly drawn by a tube drawing device, and laid to obtain the first fiber web;

[0018] (S2) Second fiber web: Bamboo pulp fibers are loosened, carded, and laid parallel to form the second fiber web;

[0019] (S3) Hydroentangling reinforcement: The first fiber web and the second fiber web are respectively fed into a composite web-forming system for composite superposition, and then are hydroentangled, dried, and wound into a roll to obtain a moisture-conducting and wear-resistant non-woven fabric for pet urine pads.

[0020] Further, the temperature of the composite spinning in step (S1) is 220 - 260 °C, preferably 240 - 250 °C.

[0021] Further, the conditions for the hydroentangling reinforcement in step (S3) are: hydroentangling pressure 5 - 10 Mpa, and the number of hydroentangling passes 3 - 6 passes.

[0022] Polypropylene has a regular structure, no polar groups on the surface, and good hydrophobicity. However, its skin-friendly property and softness are poor. Generally, when softening modification is carried out on it, the hydrophobicity and wear resistance will be reduced. In the present invention, polypropylene is melt grafted with acrylate polyether silane and aromatic unsaturated acyl halide, and flexible polyether long molecular chains, silane groups and acyl halide groups are grafted onto the macromolecular chains of polypropylene. Among them, the long-chain polyether group has good flexibility, which can improve the softness of polypropylene; the silane group has good hydrophobicity, which improves the hydrophobicity of polypropylene, thus making up for the problem of reduced hydrophobicity caused by the introduction of the polyether segment; in addition, the aromatic unsaturated acyl halide is a small molecule rigid substance, and its acyl chloride group can react with the silane oxygen group, thereby forming local rigid cross-links in the flexible long grafted chain, and further improving the mechanical properties of the modified polypropylene. Acrylate polyether silane and aromatic unsaturated acyl halide act synergistically in a certain proportion, so that the modified polypropylene has good skin-friendly property while maintaining its good hydrophobicity and wear resistance. However, the cost of the above-mentioned modified polypropylene fiber is high. In the present invention, the modified polypropylene and polypropylene are compound spun into a core-sheath structure bicomponent fiber in a core-sheath structure to reduce the cost; the core-sheath structure bicomponent fiber is a composite fiber in which the two components are arranged in a core-sheath form, and it is composed of two polymers with different properties surrounded by one component along the fiber axis, combining the characteristics of the two fibers; in the present invention, polypropylene is used as the core layer, providing a high breaking strength; the modified polypropylene is used as the skin layer, which is in direct contact with the skin, providing good hydrophobicity and wear resistance while providing good softness. At the same time, due to the difference in the thermal shrinkage properties of the modified polypropylene and the unmodified polypropylene, different degrees of shrinkage will occur during the spinning process, generating three-dimensional spiral crimps, further improving the bulkiness and softness. Therefore, the bicomponent fiber of modified polypropylene / polypropylene obtained by the spunbond process has good hydrophobicity, wear resistance and good skin-friendly softness while maintaining good hydrophobicity and wear resistance.

[0023] Bamboo pulp fiber has excellent moisture absorption ability. Taking it as the second fiber web and compounding it with the above-mentioned first fiber web to form a composite structure non-woven fabric with a hydrophobic layer-hydrophilic layer structure. Its differential capillary effect and wetting gradient effect form an additional pressure difference in the thickness direction of the non-woven fabric, which can quickly introduce excreta such as pet urine into the second fiber web, thus avoiding urine leakage, that is, realizing the moisture conduction function; at the same time, the first fiber web has good mechanical strength and softness, that is, it can achieve good wear resistance and skin-friendly property.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention first obtains modified polypropylene by melt co-grafting acrylate polyether silane and aromatic unsaturated acyl halide to polypropylene; then the modified polypropylene and polypropylene are subjected to bicomponent spinning and spunbonding in a core-skin structure to obtain a first fiber web that is wear-resistant, hydrophobic and soft; then the first fiber web is compounded with a second fiber web composed of bamboo pulp fibers, and reinforced by a spunlace process to obtain a moisture-conducting and wear-resistant nonwoven fabric for pet urine pads. When in use, the first fiber web faces upward and is in direct contact with the pet. Due to the large difference in hydrophilicity and hydrophobicity between the two fiber webs, a differential capillary effect is formed, which allows the pet's urine and other excrement to be quickly introduced into the second fiber web, thereby avoiding urine leakage, that is, achieving the moisture-conducting function; at the same time, since the first fiber web is wear-resistant and soft, it can achieve good wear resistance and skin affinity.

[0026] 2. The present invention combines the spunbond process with the spunlace process, and has high production efficiency. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with specific embodiments, but is not limited to the contents of the specification. Unless otherwise specified, the "parts" described in the embodiments of the present invention are all parts by weight. The reagents used are all commercially available reagents in the art.

[0028] Polypropylene chips were purchased from Beijing Yanshan Petrochemical Corporation, and the melt index was 38±1g / 10min.

[0029] The bamboo pulp fiber was purchased from Shandong Jiumian Textile Co., Ltd., 1.33dtex×38mm.

[0030] AC-PEG600-Silane, AC-PEG1000-Silane, AC-PEG2000-Silane, and AC-PEG3000-Silane are all acrylate polyether trimethoxysilanes, industrial grade, all selected from Xi'an Qiyue Biotechnology Co., Ltd.; the number average molecular weight of the polyethylene glycol segment in AC-PEG600-Silane is 600, the number average molecular weight of the polyethylene glycol segment in AC-PEG1000-Silane is 1000, the number average molecular weight of the polyethylene glycol segment in AC-PEG2000-Silane is 2000, and the number average molecular weight of the polyethylene glycol segment in AC-PEG3000-Silane is 3000.

[0031] Methoxy polyethylene glycol (1000) acrylate is selected from Guangzhou Haoyi New Materials Technology Co., Ltd., model MPEG1000A.

[0032] Preparation of Modified Polypropylene

[0033] Preparation Example 1

[0034] After mixing 100 parts of polypropylene chips, 20 parts of AC-PEG1000-Silane, 3 parts of cinnamoyl chloride and 0.15 part of dicumyl peroxide evenly, a melt grafting reaction is carried out in a twin-screw extruder at 200 °C, and the screw speed is 80 r / min; the reaction extrudate is cooled by water and pelletized by a pelletizer to obtain modified polypropylene.

[0035] Preparation Example 2

[0036] The rest is the same as Preparation Example 1, except that: the amount of AC-PEG1000-Silane used is 25 parts.

[0037] Preparation Example 3

[0038] The rest is the same as Preparation Example 1, except that: the amount of AC-PEG1000-Silane used is 30 parts and the amount of cinnamoyl chloride used is 5 parts.

[0039] Preparation Example 4

[0040] The rest is the same as Preparation Example 1, except that: the amount of AC-PEG1000-Silane used is 35 parts and the amount of cinnamoyl chloride used is 7 parts.

[0041] Preparation Example 5

[0042] The rest is the same as Preparation Example 1, except that: AC-PEG2000-Silane is used to replace AC-PEG1000-Silane, and 4-vinylbenzoyl chloride is used to replace cinnamoyl chloride.

[0043] Preparation Example 6

[0044] The rest is the same as Preparation Example 1, except that: AC-PEG600-Silane is used to replace AC-PEG1000-Silane.

[0045] Preparation Example 7

[0046] The rest is the same as Preparation Example 1, except that: AC-PEG3000-Silane is used to replace AC-PEG1000-Silane.

[0047] Comparative Preparation Example 1

[0048] The rest is the same as Preparation Example 1, except that: methoxypolyethylene glycol (1000) acrylate (MPEG1000A) is used to replace AC-PEG1000-Silane in equal mass.

[0049] Comparative Preparation Example 2

[0050] The rest is the same as Preparation Example 1, except that: cinnamoyl chloride is not used.

[0051] Example 1

[0052] (S1) First fiber web: 10 kg of the modified polypropylene prepared in Preparation Example 1 was fed into an extruder for heating and melting, passed through a melt filter and a metering pump, and entered the skin layer cavity of the composite component in a bicomponent spinning box; meanwhile, 90 kg of polypropylene was added to the extruder for heating and melting, passed through a melt filter and a metering pump, and entered the core layer cavity of the composite component in the bicomponent spinning box; at the outlet, composite spinning was carried out (spinning temperature was 245 °C) to form a bicomponent fiber raw yarn with a concentric skin-core structure. The raw yarn was cooled by side blowing, highly drawn by a tube type drawing device, and laid to obtain a first fiber web with a fineness of 2.1 dtex and a grammage of 12 g / m 2 ;

[0053] (S2) Second fiber web: The bamboo pulp fiber was loosened, carded, and laid parallel to form a second fiber web with a grammage of 25 g / m 2 ;

[0054] (S3) Hydroentangling reinforcement: The first fiber web and the second fiber web were respectively fed into a composite web-forming system for composite superposition, and then subjected to hydroentangling reinforcement (hydroentangling pressure 7 Mpa, number of hydroentangling passes 5), drying, and winding to obtain a moisture-conducting and wear-resistant non-woven fabric for pet urine pads.

[0055] Examples 2 - 7

[0056] The rest was the same as Example 1, except that the modified polypropylene was respectively prepared in Preparation Examples 2 - 7.

[0057] Example 8

[0058] The rest was the same as Example 1, except that in step (S1), the dosage of the modified polypropylene was 30 kg and the dosage of polypropylene was 70 kg.

[0059] Comparative Examples 1 - 2

[0060] The rest was the same as Example 1, except that the modified polypropylene was respectively prepared in Comparative Preparation Examples 1 - 2.

[0061] Testing and analysis

[0062] The moisture-conducting and wear-resistant non-woven fabrics for pet urine pads prepared in the above examples and comparative examples were subjected to the following performance tests, and the results are shown in Table 1.

[0063] Liquid penetration time: Measured with reference to standard GB / T 24218.8. The shorter the penetration time, the better the moisture-conducting performance.

[0064] Softness: The transverse softness and longitudinal softness were measured with reference to standard GB-T 8942-2016. The larger the value, the worse the softness.

[0065] Abrasion resistance: The test was carried out in accordance with the provisions of GB / T 21196.2-2007 "Textiles - Determination of Martindale abrasion resistance of fabrics - Part 2: Determination of specimen damage". The test conditions were: friction load of 5 kPa, standard wool felt; record the total number of frictions when the specimen is damaged, determine its abrasion resistance, and the higher the total number of frictions at the time of damage, the better the abrasion resistance.

[0066] Table 1 Performance Test

[0067]

[0068]

[0069] As can be seen from Table 1, the non-woven fabric prepared in the embodiment of the present invention has good moisture conductivity and abrasion resistance, and is at the same time skin-friendly and soft. The non-woven fabric prepared in Comparative Example 1 has good softness, but poor abrasion resistance and moisture conductivity. The non-woven fabric prepared in Comparative Example 2 has good moisture conductivity and softness, but poor abrasion resistance.

[0070] The above detailed description is a specific description of one of the feasible embodiments of the present invention, and this embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or change without departing from the present invention shall be included within the scope of the technical solution of the present invention.

Claims

1. A moisture-conducting and wear-resistant nonwoven fabric for pet urine pads, which is formed by hydroentangling a first fiber web and a second fiber web; characterized in that, The first fiber web is formed by spunbonding bicomponent fibers with a skin-core structure. The skin layer of the bicomponent fibers is modified polypropylene, and the core layer is polypropylene; the second fiber web is formed by directly laying bamboo pulp fibers; the modified polypropylene is obtained by melt-grafting modification of polypropylene with acrylate polyether silane and aromatic unsaturated acyl halide.

2. The moisture-conducting and wear-resistant non-woven fabric for pet urine pads according to claim 1, characterized in that In the preparation of the modified polypropylene, the mass ratio of polypropylene, acrylate polyether silane, and aromatic unsaturated acyl halide is 100:(20 - 35):(3 - 7), preferably 100:(25 - 30):(3 - 5).

3. The moisture-conducting and wear-resistant non-woven fabric for pet urine pads according to claim 1, characterized in that, The melt index of the polypropylene is 25 - 40 g / 10min.

4. The moisture-conducting and wear-resistant nonwoven fabric for pet pee pads according to claim 1, wherein The acrylate polyether silane is a compound containing acrylate groups, polyether segments, and silane oxygen groups, where the silane oxygen group is methoxysilane or ethoxysilane, and the number-average molecular weight of the polyether segment is 1000 - 2000.

5. The moisture-conducting and wear-resistant nonwoven fabric for pet urine pads according to claim 1, characterized in that, The aromatic unsaturated acyl halide is at least one of cinnamoyl chloride, p-styrenesulfonyl chloride, and 4-vinylbenzoyl chloride.

6. The moisture-conducting and wear-resistant nonwoven fabric for pet urine pads according to claim 1, wherein The modified polypropylene is obtained by the following preparation method: mixing polypropylene chips, acrylate polyether silane, aromatic unsaturated acyl halide, and an initiator evenly, and performing melt grafting to obtain the modified polypropylene.

7. The moisture-conducting and wear-resistant non-woven fabric for pet urine pads according to claim 6, wherein The initiator is at least one of diisopropylbenzene peroxide and ditert-butyl peroxide, and the dosage of the initiator is 0.1 - 0.2 wt% of the polypropylene chips; the conditions for the melt grafting are: carried out in a twin-screw extruder, the reaction temperature is 200 - 220 °C, and the rotation speed is 70 - 80 r / min.

8. The moisture-conducting and wear-resistant nonwoven fabric for pet urine pads according to claim 1, characterized in that, The skin-core structure is one of concentric type or eccentric type, preferably the concentric type; in the bicomponent fibers with the skin-core structure, the skin layer accounts for 10 wt% - 30 wt%; and / or The fineness of the bicomponent fiber with a sheath-core structure is 1.5 to 2.5 dtex, the fineness of the bamboo pulp fiber is 1.0 to 1.5 dtex, and the length is 30 to 50 mm; the grammage of the first fiber web is 8 to 15 g / m 2 , and the grammage of the second fiber is 15 to 25 g / m 2 .

9. The preparation method of the moisture-conducting and wear-resistant non-woven fabric for pet urine pads according to any one of claims 1-8, characterized in that, It includes the following steps: (S1) First fiber web: Feeding the modified polypropylene and polypropylene into two groups of extruders respectively for heating and melting, passing through a melt filter and a metering pump respectively into the skin layer cavity and the core layer cavity of the composite component of the bicomponent spinning box; performing composite spinning at the outlet to form bicomponent fiber filaments with a skin-core structure, and the filaments are cooled by side blowing, highly drawn by a tube drawing device, and laid to obtain the first fiber web; (S2) Second fiber web: Loosening, carding, and parallel laying of bamboo pulp fibers to form the second fiber web; (S3) Hydroentangling reinforcement: Feeding the first fiber web and the second fiber web into a composite web-forming system for composite superposition, and then through hydroentangling reinforcement, drying, and winding to obtain the moisture-conducting and wear-resistant non-woven fabric for pet urine pads.

10. The preparation method according to claim 9, wherein In step (S1), the temperature of the composite spinning is 220 - 260 °C, preferably 240 - 250 °C; in step (S3), the conditions for the hydroentangling reinforcement are: the hydroentangling pressure is 5 - 10 Mpa, and the number of hydroentangling passes is 3 - 6 passes.

Images