CN116084176A

CN116084176A - Macromolecule modified high-strength tearing-resistant sunshade tarpaulin and preparation method thereof

Info

Publication number: CN116084176A
Application number: CN202211692645.7A
Authority: CN
Inventors: 周敏; 孙玲
Original assignee: Suqian Jiaxin Fabric Co ltd
Current assignee: Suqian Jiaxin Fabric Co ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-05-09

Abstract

The invention relates to the field of awning cloth, and discloses high-strength tearing-resistant awning cloth modified by a polymer and a preparation method thereof. According to the invention, the modified flaky silicon dioxide powder is added into the polymer fiber, so that compared with spherical silicon dioxide, the flaky silicon dioxide has sharper corners, and stress concentration is easy to occur at the corners when the fiber is stressed, so that the polymer fiber can be broken according to the pre-design, and the tear resistance is improved; according to the invention, a mixed weaving process is adopted, the first warp and the second warp, the first weft and the second weft are respectively arranged, when tearing occurs, the first warp or the second weft breaks, so that weaving wires in the vertical direction are released from weaving, the first warp or the first weft are mutually close to each other, a tearing opening is transversely expanded, the originally larger stress concentration level at the tearing opening is reduced, the tearing expansion is avoided, and the structural anti-tearing design is provided, so that the safety is higher.

Description

Macromolecule modified high-strength tearing-resistant sunshade tarpaulin and preparation method thereof

Technical Field

The invention belongs to the field of awning cloth, and particularly relates to high-strength tearing-resistant awning cloth modified by a polymer and a preparation method thereof.

Background

The tarpaulin is an industrial cloth with large usage amount and wide application range, and is made by using polyester staple fiber woven cloth as base cloth, making double-sided artificial leather by plastic coating and sewing. The existing tarpaulin has the defects of low strength, large weight, rough surface, narrow surface width, easy aging, short service life, poor flame retardance, low softness, substandard warp and weft fracture tension and elongation and the like in the use process.

In the prior art, there are improvements in terms of improving the tear resistance of tarpaulins:

(1) CN113863003a discloses a tarpaulin for high strength and tear-resistant transportation and a manufacturing method, and specifically discloses that the tarpaulin is manufactured by adopting a modified base cloth and a high adhesion coating layer, in the preparation of the modified base cloth, the base cloth formed by interweaving upper and lower layers of wefts through upper and lower interlacing of threads has stable performance, then the base cloth is treated by a penetrating agent matched with current, the surface of the base cloth is formed into a microporous structure, then the base cloth is treated by a strength modifier, wollastonite and six-ring stone in the strength modifier can be inserted into the base cloth after being treated, so that the performance of the base cloth is more stable, and the stability of the base cloth is improved.

(2) CN114561814a discloses a tear-resistant tarpaulin and a manufacturing method thereof, and in particular discloses a tear-resistant tarpaulin, wherein the tear-resistant coating contains polyethersulfone, the polyethersulfone has good toughness, impact strength and dynamic viscoelasticity, and the addition of the polyethersulfone can effectively improve the tear resistance, fracture toughness and impact strength of the tarpaulin; the tearing-resistant coating also contains polymethyl vinyl siloxane potassium silanol; on the one hand, the polymethyl vinyl siloxane potassium silanolate has good tensile strength and tearing strength, is extremely soft, and can enable tarpaulin to have good repeated folding performance and tearing resistance.

(3) CN214873171U discloses a waterproof tear-resistant ageing resistance heat preservation tarpaulin, specifically discloses setting through strengthening mechanism, under the effect of horizontal strengthening rib, can improve the tarpaulin and receive the resistance to compression effect when transversely pulling, under the effect of vertical strengthening rib, can improve the tarpaulin and receive the resistance to compression effect when vertically pulling, for traditional tarpaulin, this tarpaulin has improved life.

The technical scheme provides improvement of the tearing-resistant tarpaulin, however, the following problems still exist in the prior art:

1. the existing tearing-resistant tarpaulin has the improvement of tearing resistance by means of a coating, for example, in the prior art (1), however, the coating is easy to age after long-time test, particularly after sun-drying, and has the problems of cracking and the like, so that the tearing-resistant strength is reduced, and the coating cannot be kept complete under the condition of impact, and still has the problem of easy tearing.

2. The existing tearing-resistant tarpaulin mainly depends on improving organic polymer fibers, so that the strength of the woven fibers is improved, and the tearing-resistant performance of the tarpaulin is further improved, for example, in the prior art (2), the cost of the improvement is high, pollution of organic solvents and the like is large when special polymer fibers are prepared, the wide popularization is not facilitated, the strength limit of the materials is limited, and the improvement space of the tearing-resistant performance of the tarpaulin is not large.

3. The existing tearing-resistant tarpaulin is improved by adding a reinforcing structure, for example, in the prior art (3), however, the problem of stress concentration in an original breaking area when the tarpaulin is torn is solved, namely, the tarpaulin is generally strong enough, when the tarpaulin is not damaged, a certain pulling force cannot tear the tarpaulin, but after the original breaking occurs, the pulling stress can form stress concentration in the breaking area, linear tearing occurs, and due to the large amplitude of the stress concentration, the pure weaving of the reinforcing fiber cannot resist, but the tearing is possibly aggravated along the length direction of the reinforcing fiber.

Disclosure of Invention

The high-strength tearing-resistant high-molecular modified sun-shading tarpaulin is formed by weaving a first warp and a second warp, a first weft and a second weft, wherein the first warp and the second warp, the first weft and the second weft are respectively arranged in a proportion of 1:1 to 3:1, the first warp and the first weft are one of high-strength polyester yarns, high-strength pe yarns and nylon yarns, and the second warp and the second weft are high-molecular modified fibers;

the warp and weft have the same bending fracture strength P1, the warp and weft have the same tensile fracture strength P2, and the 1.75P2 is less than or equal to P1;

the tarpaulin satisfies: in the range of the tearing angle of more than 120 degrees, the warp B is broken before the warp A or the weft B is broken before the weft A;

if tearing occurs along the warp yarn direction, after the second warp yarn is subjected to tension fracture, the first weft yarn is unwound at the fracture position, and the first warp yarns at the two sides of the broken second warp yarn are mutually close to each other and slide away from the tearing opening;

if the tearing occurs along the weft yarn direction, after the tension force of the second weft yarn breaks, the broken part of the first warp yarn is unwound, and the first weft yarns on two sides of the broken second weft yarn are mutually close to each other and slide away from the tearing opening occurs.

Further, the polymer modified fiber has the following weight components: 70-85 parts of high-density polyethylene, 10-20 parts of polyacrylate, 1.5-3.5 parts of modified flaky silicon dioxide powder, 0.02-0.08 part of sodium gluconate, 5-9 parts of acrylate rubber, 2-8 parts of triethanolamine, 1.1-3.2 parts of diboron trioxide and 1.8-5.0 parts of plasticizer; the components are uniformly mixed, heated to the softening temperature of 125-135 ℃, banburying and extrusion are carried out to obtain the polymer modified fiber.

Further, the modified flaky silicon dioxide powder is prepared by carrying out surface modification on flaky silicon dioxide powder by a silane coupling agent method or an alcohol modification method;

the flaky silica powder is prepared according to the following method:

step one, adding fluorine-containing silane into an alcohol solution of tetraethyl orthosilicate, and obtaining fluorine modified silica sol through the action of an acid catalyst;

coating fluorine modified silica sol to a plastic film;

and thirdly, separating in water bath, and drying and crushing to prepare the modified flaky silicon dioxide powder.

A preparation method of macromolecule modified high-strength tearing-resistant sun-shading tarpaulin is used for preparing the tarpaulin and comprises the following steps:

s1: preparing a second warp and a second weft: the warp and weft are polymer modified fibers, and the polymer modified fibers comprise the following components in parts by weight: 70-85 parts of high-density polyethylene, 10-20 parts of polyacrylate, 1.5-3.5 parts of modified flaky silicon dioxide powder, 0.02-0.08 part of sodium gluconate, 5-9 parts of acrylate rubber, 2-8 parts of triethanolamine, 1.1-3.2 parts of diboron trioxide and 1.8-5.0 parts of plasticizer; the components are uniformly mixed, heated to the softening temperature of 125-135 ℃, banburying and extrusion are carried out to obtain the macromolecule modified fiber;

s2: and (3) wire preparation: the first warp and the first weft are one of high-strength polyester yarns, high-strength pe yarns and nylon yarns, the first warp and the second warp are matched according to the proportion of 1:1 to 3:1, and the first weft and the second weft are respectively matched according to the proportion of 1:1 to 3:1;

s3: weaving: finishing the weaving of the tarpaulin on a loom;

s4: and (3) coating: coating flame-retardant paint on two sides of the woven tarpaulin, wherein each coating is performed for 2 times for 4 times, and drying in a dryer after each coating time

the flaky silica powder is prepared according to the following method:

coating fluorine modified silica sol to a plastic film;

Further, the flame retardant coating comprises the following components in parts by weight of 100 parts of epoxy resin: 100 parts of epoxy resin, 10-15 parts of dibutyl phthalate, 10 parts of ethanol, 5 parts of antimonous oxide, 8-13 parts of a coupling agent, 1-2 parts of an antioxidant and 10-20 parts of an amine curing agent.

Further, the loom is a water jet loom.

Advantageous effects

Compared with the prior art, the invention provides the light high-strength tarpaulin for the vehicle and the preparation method thereof, and the tarpaulin has the following beneficial effects:

1. the invention carries out surface modification on the flaky silicon dioxide by a silane coupling agent method or an alcohol modification method, improves the affinity of flaky silicon dioxide powder to the polymer fiber, ensures that the flaky silicon dioxide powder can be uniformly distributed in the polymer fiber to avoid aggregation, and ensures that the performance of the polymer fiber is uniform.

2. According to the invention, the modified flaky silicon dioxide powder is added into the polymer fiber, so that the flaky silicon dioxide has sharper corners compared with spherical silicon dioxide, and stress concentration is easy to occur at the corners when the fiber is stressed, so that the polymer fiber can be broken according to the pre-design, and the tear resistance is improved.

3. According to the invention, a mixed weaving process is adopted, a first warp and a second warp, a first weft and a second weft are respectively arranged, polymer fibers mixed with modified flaky silicon dioxide powder are adopted as the second warp and the second weft, when tearing occurs, the second warp or the second weft is broken firstly, weaving yarns (the first weft or the first warp) in the vertical direction are relieved, the first warp or the first weft are mutually close, and a tearing opening is transversely expanded, so that the originally larger stress concentration level at the tearing opening is reduced, the tearing expansion is avoided, and compared with the prior art, the structural anti-tearing design is provided.

Drawings

FIG. 1 is a schematic view of a yarn according to the present invention;

FIG. 2 is a schematic diagram of a stress zone after an initial tear in the prior art;

FIG. 3 is a schematic diagram of the stress area after the first warp or the first weft is attached after the second warp or the second weft is broken;

FIG. 4 is a schematic view of the force triangle of the warp and weft of the present invention;

fig. 5 is a photograph of a sample of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Embodiment one:

the flaky silica powder is prepared according to the following method:

coating fluorine modified silica sol to a plastic film;

s3: weaving: finishing the weaving of the tarpaulin on a loom;

the flaky silica powder is prepared according to the following method:

coating fluorine modified silica sol to a plastic film;

Further, the loom is a water jet loom.

Specifically, "tearing" is a common form of tarpaulin breaking, and is essentially that local breakage causes stress concentration, so that the spinning stress of a region is greater than the strength limit, and continuous breakage occurs, therefore, tearing usually occurs along the length direction of spinning, and since the stress concentration ratio (the ratio of the stress in the concentrated region to the attractive force in the non-concentrated region) is usually very high, the spinning strength is simply improved, and the problem of stress concentration at the start of tearing is not sufficiently resisted, but once tearing occurs, the tearing rapidly occurs along the length direction of spinning, similar to "tearing cotton cloth" or "splitting bamboo". The key to improving tear resistance is to resist the development of initial cracks.

The textile is provided with warp threads and weft threads, the warp threads and the weft threads are easy to tear along the length direction of the warp threads, a part of weft threads are broken to form an initial breaking area, warp threads on two sides of the breaking area are pulled and turned, the turning angle is alpha, the tearing angle 2 alpha is formed on two sides of the breaking area, an isosceles triangle is formed due to the fact that the tension of the flexible threads is uniform, the resistance of the weft threads is 2sin (alpha/2), specifically, when the tearing angle is 0 degree, the weft threads are not stressed, and when the tearing angle reaches 180 degrees, the warp threads and the weft threads are hooked at right angles, and the stress is the same; at a tear angle of 90 deg., the warp yarn is stressed 1.74 times the weft yarn. It is considered that tearing easily occurs at an angle of more than 45 °, and therefore, the ultimate strength of the warp yarn and the weft yarn is 1.75 times, and it is satisfied that the second warp yarn breaks before the first warp yarn or the second weft yarn breaks before the first weft yarn in a range where the tearing angle is more than 90 °.

After the warp B or weft B breaks, the weaving contact is performed, the warp A or weft A generates 'doubling', the stress area is enlarged, the stress concentration coefficient is reduced, the subsequent transverse wires cannot be subjected to high stress effect and cannot continuously break, the initial tearing is stopped, the vertical wires of the tarpaulin are transversely moved in macroscopic view, the transverse wires generate 'wiredrawing', and a plurality of transverse wires are connected in parallel, so that the expansion of the tearing opening is organized. Furthermore, the warp and weft only occur in the limit state, and the normal service life of the tarpaulin is not affected because the warp and weft are not broken in daily use.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The high-strength tearing-resistant sun-shading tarpaulin is characterized by being woven by a first warp and a second warp, a first weft and a second weft, wherein the first warp and the second warp, the first weft and the second weft are respectively arranged in a proportion of 1:1 to 3:1, the first warp and the first weft are one of high-strength polyester yarns, high-strength pe yarns and nylon yarns, and the second warp and the second weft are high-molecular modified fibers;

the tarpaulin satisfies: in the range of the tearing angle of more than 90 degrees, the warp B is broken before the warp A or the weft B is broken before the weft A;

2. The high molecular modified high strength tear resistant sun shade cloth of claim 1, wherein: the warp and weft have the same bending fracture strength P1, the warp and weft have the same tensile fracture strength P2, and P1 is more than or equal to 1.75P2.

3. The high molecular modified high strength tear resistant sun shade cloth of claim 2, wherein: the polymer modified fiber comprises the following components in parts by weight: 70-85 parts of high-density polyethylene, 10-20 parts of polyacrylate, 1.5-3.5 parts of modified flaky silicon dioxide powder, 0.02-0.08 part of sodium gluconate, 5-9 parts of acrylate rubber, 2-8 parts of triethanolamine, 1.1-3.2 parts of diboron trioxide and 1.8-5.0 parts of plasticizer; the components are uniformly mixed, heated to the softening temperature of 125-135 ℃, banburying and extrusion are carried out to obtain the polymer modified fiber.

4. A high molecular modified high strength tear resistant sun shade according to claim 3, wherein: the modified flaky silicon dioxide powder is prepared by carrying out surface modification on flaky silicon dioxide powder by a silane coupling agent method or an alcohol modification method;

the flaky silica powder is prepared according to the following method:

coating fluorine modified silica sol to a plastic film;

5. A method for preparing a high-strength tear-resistant sunshade tarpaulin modified with a polymer, for preparing the tarpaulin according to any of the claims 1 to 4, comprising the steps of:

s3: weaving: finishing the weaving of the tarpaulin on a loom;

s4: and (3) coating: and coating flame-retardant paint on two sides of the woven tarpaulin, wherein each coating is performed for 2 times and 4 times, and drying in a dryer after each coating time.

6. The method for preparing the macromolecule modified high-strength tearing-resistant sun-shading tarpaulin according to claim 5, wherein the method comprises the following steps:

the modified flaky silicon dioxide powder is prepared by carrying out surface modification on flaky silicon dioxide powder by a silane coupling agent method or an alcohol modification method;

the flaky silica powder is prepared according to the following method:

coating fluorine modified silica sol to a plastic film;

7. The method for preparing the macromolecule modified high-strength tearing-resistant sun-shading tarpaulin according to claim 6, wherein the method comprises the following steps: the flame-retardant coating comprises the following components in parts by weight of epoxy resin: 100 parts of epoxy resin, 10-15 parts of dibutyl phthalate, 10 parts of ethanol, 5 parts of antimonous oxide, 8-13 parts of a coupling agent, 1-2 parts of an antioxidant and 10-20 parts of an amine curing agent.

8. The method for preparing the macromolecule modified high-strength tearing-resistant sun-shading tarpaulin according to claim 7, wherein the method comprises the following steps: the loom is a water jet loom.