CN-122008651-A - High-strength waterproof composite non-woven fabric and preparation method thereof

CN122008651ACN 122008651 ACN122008651 ACN 122008651ACN-122008651-A

Abstract

The invention relates to the technical field of polymer composite materials, and particularly discloses a high-strength waterproof composite non-woven fabric and a preparation method thereof, wherein the high-strength waterproof composite non-woven fabric is a double-layer co-extrusion composite non-woven fabric and comprises a non-woven fabric layer and a waterproof layer, and the non-woven fabric layer comprises raw materials of a high-melting-point polymer and a low-melting-point polymer; the waterproof layer comprises polybutene-1, modified ethylene propylene rubber, an interface modifier, talcum powder, titanium dioxide, an ultraviolet absorber and an antioxidant. The invention effectively solves the technical problem of interface incompatibility between the nonpolar rubber-based waterproof layer and the polar polyester-based reinforcing layer by introducing the interface modifier containing isocyanate groups and epoxy groups, wherein the active groups of the interface modifier form covalent bonds with the active groups on the surface of the non-woven fabric layer, and the polypropylene main chain forms physical entanglement with the waterproof layer matrix through chain segment movement, thereby macroscopically representing high interlayer peeling strength.

Inventors

JIANG TAO
ZHANG YUN
QIU YAXIN
DU LONGCHAO
YANG YUN
XIANG XIANCHENG
HU JIANYI

Assignees

江苏沃峰新材料有限公司

Dates

Publication Date: 20260512
Application Date: 20260326

Claims (10)

1. The high-strength waterproof composite non-woven fabric is characterized by being a double-layer co-extrusion composite non-woven fabric and comprising a non-woven fabric layer and a waterproof layer, wherein the weight ratio of the non-woven fabric layer to the waterproof layer is 1-3:4-7; The non-woven fabric layer comprises the following raw materials, by weight, 60-80 parts of high-melting-point polymer and 20-40 parts of low-melting-point polymer; The waterproof layer comprises the following raw materials, by weight, 30-50 parts of polybutene, 20-40 parts of modified ethylene propylene rubber, 2-8 parts of an interface modifier, 10-20 parts of talcum powder, 3-8 parts of titanium dioxide, 0.5-1.5 parts of an ultraviolet absorbent and 0.5-1.5 parts of an antioxidant; the modified ethylene propylene rubber is obtained by sequentially reacting ethylene propylene rubber with allyl polyether, vinyl trimethoxy silane and polymethyl hydrogen siloxane under the action of a platinum catalyst.
2. The high strength waterproof composite nonwoven fabric according to claim 1, wherein said The high-melting polymer in the non-woven fabric layer is polyethylene terephthalate, the melting point is 245-265 ℃ and the intrinsic viscosity is 0.70dL/g-0.90dL/g.
3. The high strength waterproof composite nonwoven fabric according to claim 1, wherein said The low-melting polymer in the non-woven fabric layer is hydrogenated rosin glyceride, the softening point is 80-120 ℃, and the hydroxyl value is not less than 5mgKOH/g.
4. The high strength waterproof composite nonwoven fabric according to claim 1, wherein said The preparation method of the modified ethylene propylene rubber in the waterproof layer comprises the following steps: s1, putting ethylene propylene rubber into a high-temperature internal mixer, and obtaining ethylene propylene rubber melt after melting and plasticizing for 3-5 min; S2, sequentially adding allyl polyether and vinyl trimethoxy silane into the ethylene propylene rubber melt, and banburying for 4-8min to obtain an intermediate mixture; S3, adding polymethylhydrosiloxane into the intermediate mixture, mixing for 1-2min, then dripping a platinum catalyst, heating to 170-180 ℃, and banburying for 5-10min to obtain a modified ethylene propylene rubber material; S4, tabletting, cooling and granulating the modified ethylene propylene rubber material to obtain the modified ethylene propylene rubber.
5. The high-strength waterproof composite non-woven fabric according to claim 4, wherein the mass ratio of the ethylene propylene rubber melt, the allyl polyether and the vinyl trimethoxysilane in the S2 is 100:8-15:2-4, and the mass ratio of the polymethylhydrosiloxane and the intermediate mixture in the S3 is 1-5:110-119.
6. The high strength waterproof composite nonwoven fabric according to claim 1, wherein said The interface modifier in the waterproof layer is polypropylene co-grafted by glycidyl methacrylate and m-isopropenyl-alpha, alpha' -dimethylbenzyl isocyanate.
7. The high strength, water resistant composite nonwoven fabric of claim 6, wherein said The interface modifier in the waterproof layer is prepared by the following method: (1) Pre-mixing the glycidyl methacrylate, the m-isopropenyl-alpha, alpha' -dimethylbenzyl isocyanate and an initiator to obtain a liquid mixture; (2) Adding the solid mixture into a double-screw extruder, and injecting the liquid mixture into the molten solid mixture in a liquid injection area through a high-pressure metering pump to perform melt grafting reaction to obtain a melt after reaction; (3) And extruding, cooling, drying and granulating the melt after the reaction, and heating and drying under a vacuum condition to obtain the interface modifier.
8. The high strength, water resistant composite nonwoven fabric of claim 7, wherein said (1) The mass ratio of the polypropylene to the antioxidant 1076 to the glycidyl methacrylate to the m-isopropenyl-alpha, alpha' -dimethylbenzyl isocyanate to the initiator is 100:0.1-0.5:2-8:1-5:0.1-0.5.
9. The high strength waterproof composite nonwoven fabric according to claim 1, wherein said The antioxidant is a mixture of antioxidant 1010 and antioxidant 168.
10. A method for preparing the high-strength waterproof composite nonwoven fabric according to any one of claims 1 to 9, comprising the steps of: Step 1, drying and uniformly mixing a high-melting polymer and a low-melting polymer under a vacuum condition to obtain a non-woven fabric layer for feeding, drying and mixing polybutene-1, modified ethylene propylene rubber, an interface modifier, talcum powder, titanium dioxide, an ultraviolet absorbent and an antioxidant under the vacuum condition, and then carrying out melt blending and granulating by a double-screw extruder to obtain a waterproof layer for feeding; step 2, adding non-woven fabric layer feeding and waterproof layer feeding into two extruders for plasticizing and melting, compounding through a co-extrusion die head, and co-extruding through a composite spinneret orifice on a spinneret plate to obtain a co-extrusion composite filament; step 3, cooling and molding the co-extrusion composite filaments through a side-blowing cooling zone, and blowing and paving the co-extrusion composite filaments on a net-forming curtain under the action of air flow to obtain a composite fiber net; and 4, conveying the composite fiber net into a hot rolling mill for hot-press bonding, and cooling, trimming and rolling the hot-rolled non-woven fabric to obtain the high-strength waterproof composite non-woven fabric.

Description

High-strength waterproof composite non-woven fabric and preparation method thereof Technical Field The invention relates to the technical field of polymer composite materials, in particular to a high-strength waterproof composite non-woven fabric and a preparation method thereof. Background The composite non-woven fabric has the advantages of different materials, and has wide application in the fields of building waterproofing, geosynthetic materials, protective articles and the like. Currently, the main processes for preparing waterproof composite non-woven fabrics comprise a film coating method, a hot melt lamination method and a coextrusion composite spinning method. The laminated film method and the lamination method are characterized in that a prefabricated waterproof film or a hot melt adhesive layer is compounded with non-woven fabrics in a hot-pressing way. The limitation of such processes is that the waterproof layer and the non-woven fabric layer are combined by means of physical adhesion or mechanical anchoring action of an adhesive, and the interface bonding strength is limited. In the long-term use process, the adhesive is easily aged and degraded under the influence of factors such as environmental temperature and humidity changes, mechanical stress and the like, so that the composite material is layered, wrinkled and the like, and the integrity of a waterproof layer is further damaged, so that the waterproof function is invalid. The coextrusion composite spinning method refers to that functional polymer melts for forming different layers are converged in the same die head and extruded through a composite spinneret orifice to form the composite fiber with an integrated interlayer structure, so that the ageing problem caused by using an adhesive is fundamentally avoided, and the problem of insufficient interfacial binding force of the composite non-woven fabric can be effectively solved. However, polypropylene (PP) spunbonded nonwoven fabrics are mostly used as reinforcement layers in the prior art. The tensile strength and modulus of the polypropylene fiber have inherent upper limits, so that the overall strength, creep resistance and dimensional stability of the final composite material are difficult to meet the requirements of high-load application scenes such as high-grade building roof waterproofing, large hydraulic engineering seepage prevention and the like. In addition, the conventional waterproof layer material is usually selected from general polyolefin such as Polyethylene (PE) and polypropylene (PP). When the material is not modified, the macromolecular chain structure is sensitive to ultraviolet rays and hot oxygen environment, and degradation, embrittlement and cracking can occur after long-term exposure to the outdoor environment, so that the waterproof performance is obviously reduced with time. In order to improve the mechanical properties and durability of the composite material, the prior art attempts to co-extrusion compound Polyester (PET) with high mechanical properties as a reinforcing layer with an ethylene propylene rubber (EPDM) based waterproof layer with excellent elasticity and weather resistance. However, PET is a strong polar polymer, whereas EPDM is a non-polar polymer, and the great polar difference and surface energy mismatch between the two results in extremely poor interfacial compatibility, and effective interlayer bonding force cannot be formed in the coextrusion process, so that the composite product is extremely prone to delamination. Therefore, the technical scheme for solving the difficult problem of interfacial compatibility between the high-strength polyester-based non-woven fabric layer and the high-elasticity and weather-resistant waterproof layer and synergistically optimizing the overall mechanical property and the long-term waterproof durability of the composite material in the coextrusion process is urgently needed to be developed in the field. Based on the above statement, the invention provides a high-strength waterproof composite non-woven fabric and a preparation method thereof. Disclosure of Invention The invention provides a high-strength waterproof composite non-woven fabric and a preparation method thereof, and aims to solve the technical problems that the composite non-woven fabric in the prior art is insufficient in overall strength, poor in weather resistance of a waterproof layer material, unstable in long-term waterproof performance, poor in interface compatibility between a high-strength polar non-woven fabric layer and a nonpolar waterproof layer, difficult to form stable combination and the like. In a first aspect, the invention provides a high-strength waterproof composite non-woven fabric, which adopts the following technical scheme: The high-strength waterproof composite non-woven fabric is a double-layer co-extrusion composite non-woven fabric and comprises a non-woven fabric layer and a waterproof layer, wherein the weight r