Preparation process of a rubber PVC coated yarn

Abstract

The present invention discloses a preparation process of a rubber PVC coated yarn, which relates to the technical field of sunshade fabrics. The process first prepares a coating layer by uniformly mixing raw materials and heating them to a molten state to obtain a coating layer in a molten state; then, the core wire is coated with the coating layer in a molten state to obtain a rubber PVC coated yarn; the raw materials of the coating layer include 20-40 parts of rubber, 30-60 parts of PVC resin, 2-15 parts of a polydopamine modified montmorillonite-nano calcium carbonate composite material, 1-12 parts of radiative cooling particles, 0.5-2 parts of a stabilizer, and 1-4 parts of a flame retardant by mass. The rubber PVC coated yarn provided by the present invention has excellent structural strength, aging resistance and heat insulation effect, and can greatly improve the sunshade and cooling effect and service life when applied to sunshade fabrics.

Description

Technical Field

[0001] The present invention relates to the technical field of sunshade fabrics, and particularly relates to a preparation process of rubber PVC-coated yarns. Background Art

[0002] PVC-coated yarns have the characteristics of sunshading, anti-ultraviolet, anti-static, high color fastness, etc., and are mainly used for sunshade fabrics, but their cooling performance is not very obvious. At present, the conventional method is to apply a reflective layer or a cooling layer on the surface of the fabric to block most of the visible light so that sunlight cannot enter the room, thereby achieving the purpose of cooling. However, the temperature rise is mainly caused by infrared rays in sunlight. Therefore, even if the visible light is reflected, the infrared rays will still cause the temperature of the fabric to rise, and then drive the indoor temperature to rise, and a good cooling effect cannot be achieved. In addition, the toughness of the existing sunshade fabrics is not very ideal, and they are prone to deformation under long-term sunlight irradiation, affecting their use effect. Although PVC-coated yarns can resist ultraviolet rays and have certain anti-aging properties, their long-term use effect still needs to be improved. Summary of the Invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and provide a preparation process of rubber PVC-coated yarns.

[0004] The technical solution of the present invention is as follows:

[0005] A preparation process of rubber PVC-coated yarns includes the following steps:

[0006] Preparation of the coating layer: The raw materials of the coating layer include 20-40 parts by mass of rubber, 30-60 parts by mass of PVC resin, 2-15 parts by mass of polydopamine-modified montmorillonite-nano calcium carbonate composite material, 1-12 parts by mass of radiative cooling particles, 0.5-2 parts by mass of stabilizer, and 1-4 parts by mass of flame retardant; mix the raw materials evenly and heat to the molten state to obtain the coating layer in the molten state;

[0007] Coating: Coating the core wire with the coating layer in the molten state to obtain rubber PVC-coated yarns.

[0008] As a preferred solution of the present invention, the preparation method of the polydopamine-modified montmorillonite-nano calcium carbonate composite material is:

[0009] Take montmorillonite and add water to prepare a suspension, ultrasonic for 1-2 h at 40-60 °C, add cetyltrimethylammonium bromide, and raise the temperature to 70-80 °C; add calcium chloride, control the temperature at 40-60 °C, then introduce a mixed gas of carbon dioxide and nitrogen, age, filter, and calcine the filter residue in a carbon dioxide atmosphere to obtain montmorillonite-nano calcium carbonate material;

[0010] Disperse montmorillonite-nano calcium carbonate material and dopamine hydrochloride in Tris buffer solution, ultrasonically treat for 0.5 - 1 h, stir and react at 30 - 60 °C for 6 - 12 h. After the reaction, separate the solid and dry it to obtain the polydopamine-modified montmorillonite-nano calcium carbonate composite material.

[0011] As a preferred embodiment of the present invention, the volume ratio of carbon dioxide to nitrogen is (6 - 8):(2 - 4), and the calcination temperature is 300 - 500 °C.

[0012] As a preferred embodiment of the present invention, the mass ratio of montmorillonite, water, cetyltrimethylammonium bromide, and calcium chloride is (9 - 12):(20 - 50):(1 - 5):(10 - 13), and the mass ratio of the montmorillonite-nano calcium carbonate material to dopamine hydrochloride is (3 - 20):1.

[0013] As a preferred embodiment of the present invention, the preparation method of the radiative cooling particles is as follows:

[0014] Disperse inorganic particles in an ethanol aqueous solution to form a dispersion liquid, then add alkali lignin and a hydrophobic modifier, adjust the pH to neutral to weakly alkaline, stir at 30 - 60 °C for a period of time, remove the supernatant, and wash and dry the remaining solid with water to obtain the radiative cooling particles.

[0015] As a preferred embodiment of the present invention, the inorganic particles include TiO 2 , and also include SiO 2 , ZnO, BaSO 4 , Al 2 O 3 , one or more of MgO;

[0016] As a preferred embodiment of the present invention, the hydrophobic modifier is a silane coupling agent.

[0017] As a preferred embodiment of the present invention, the mass ratio of alkali lignin to inorganic particles is 1:(0.5 - 3);

[0018] As a preferred embodiment of the present invention, the mass ratio of the hydrophobic modifier to inorganic particles is (0.1 - 5):1.

[0019] As a preferred embodiment of the present invention, the stirring speed is 200 - 500 r / min, and the stirring time is 0.5 - 2 h;

[0020] As a preferred embodiment of the present invention, the drying is freeze-drying.

[0021] As a preferred embodiment of the present invention, the particle size of the radiative cooling particles is 3 - 10 μm.

[0022] As a preferred embodiment of the present invention, the radiative cooling particles further comprise cellulose, and the cellulose is added simultaneously with alkali lignin and a hydrophobic modifier.

[0023] As a preferred embodiment of the present invention, the mass ratio of the cellulose to the inorganic particles is (0.2 - 2):1.

[0024] As a preferred embodiment of the present invention, the rubber comprises one or more of styrene-butadiene rubber, nitrile rubber, isoprene rubber, ethylene-propylene rubber, and chloroprene rubber.

[0025] The beneficial effects that can be achieved by the present invention:

[0026] For the montmorillonite-nano calcium carbonate composite material provided by the present invention, when preparing the suspension of montmorillonite, the reaction raw materials for generating nano calcium carbonate are distributed in the layered structure of montmorillonite, so that the granular nano calcium carbonate obtained by the reaction is more uniformly dispersed in the layered structure of montmorillonite. Montmorillonite is composed of layered silicate and has a large aspect ratio. After treatment, when dispersed in rubber PVC, it can form a nano composite material in which part or all of the layered silicate is intercalated or exfoliated. Nano calcium carbonate is spherical particles, which combine with the layered structure of montmorillonite to form a specific composite structure, thus having a synergistic effect of toughening and stiffening rubber PVC. At the same time, during the preparation of the montmorillonite-nano calcium carbonate composite material, a mixed gas of carbon dioxide and nitrogen is introduced. Carbon dioxide can provide carbonate ions for the reaction system to react with calcium chloride to obtain calcium carbonate, while nitrogen is used to buffer the concentration of carbon dioxide to avoid excessive generation of carbonate chloride ions locally, so that the generated calcium carbonate can be uniformly dispersed in the layered structure of montmorillonite. Moreover, the introduction of the mixed gas can further prevent the aggregation of nano calcium carbonate particles. Polydopamine, in which the catechol groups endow excellent surface and interface adhesion ability. Relying on hydrogen bonds, chemical bonds and other interactions, the polydopamine material can adhere to the surfaces of different substrates. Polydopamine can also absorb ultraviolet light and play an ultraviolet protection role. The connection strength between the polydopamine-modified montmorillonite-nano calcium carbonate material and rubber PVC is greatly improved, enhancing the structural strength and aging resistance of the obtained coating layer.

[0027] TiO 2 and ZnO, MgO, SiO 2 , BaSO 4 , Al 2 O 3 have high infrared emissivity and low sunlight absorption. TiO 2 particles have a high reflectivity and can strongly scatter sunlight. After hydrophobic modification, a large number of hydrophobic groups are distributed on the surface and a large number of methoxy groups (-OCH 3 ) are grafted, endowing it with hydrophobic properties while increasing its radiative cooling performance; ZnO, MgO, SiO 2, BaSO 4 , Al 2 O 3 has a high infrared emissivity performance. After hydrophobic modification, its radiative cooling performance is also increased. It cooperates with TiO 2 to achieve efficient cooling. Lignin is an aromatic high polymer widely present in plants. Lignin contains a large number of conjugated structures such as benzene rings and carbonyl groups, as well as phenolic hydroxyl groups, and has excellent antioxidant and ultraviolet resistance properties. It can scavenge free radicals generated by inorganic particles due to light, and improve the aging resistance of rubber PVC. The coating of alkali lignin can enable inorganic particles to achieve self-dispersion in rubber PVC, improving the strength and cooling effect of rubber PVC. The cellulose molecule has polarity, and the intermolecular force between molecular chains is very strong, with strong rigidity. The addition of cellulose can toughen and stiffen rubber PVC. The radiative cooling particles provided by the present invention play a synergistic role with the polydopamine-modified montmorillonite-nano calcium carbonate material, enhancing the structural strength and aging resistance of rubber PVC.

[0028] The rubber PVC-coated yarn obtained by the method of the present invention has excellent structural strength, aging resistance and heat insulation effect. When applied to sunshade fabrics, it can greatly improve the sunshade and cooling effect and service life. Specific Embodiments

[0029] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention. For those not specified in the embodiments regarding specific technologies or conditions, they shall be carried out according to the technologies or conditions described in the literature in the art or according to the product specifications. For reagents or instruments not specified as to the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0030] In the following embodiments, calcium-zinc stabilizer is selected as the stabilizer, zinc borate is selected as the flame retardant, and glass fiber is selected as the core wire.

[0031] Example 1

[0032] A preparation process of a rubber PVC-coated yarn includes the following steps:

[0033] 1) Preparation of polydopamine-modified montmorillonite-nano calcium carbonate composite material:

[0034] Take montmorillonite and add water to prepare a suspension. Ultrasonic it at 40°C for 1.5 h, add cetyltrimethylammonium bromide, and raise the temperature to 75°C; add calcium chloride, control the temperature at 45°C, then introduce a mixed gas of carbon dioxide and nitrogen with a volume ratio of 6:4, age, filter, and calcine the filter residue in a carbon dioxide atmosphere. The calcination temperature is 350°C to obtain montmorillonite-nano calcium carbonate material; among them, the mass ratio of montmorillonite, water, cetyltrimethylammonium bromide, and calcium chloride is 10:50:3:12;

[0035] Disperse montmorillonite-nano calcium carbonate material with a mass ratio of 5:1 and dopamine hydrochloride in Tris buffer solution, ultrasonically treat for 0.5 h, stir and react at 40 °C for 10 h. After the reaction, separate the solid and dry it to obtain polydopamine-modified montmorillonite-nano calcium carbonate composite material.

[0036] 2) Preparation of radiative cooling particles:

[0037] Disperse inorganic particles TiO 2 、SiO 2 (with a mass ratio of 1:1) in an ethanol aqueous solution to form a dispersion;

[0038] Then add alkali lignin and hydrophobic modifier aminopropyl ethoxysilane, adjust the pH to neutral, and stir at 40 °C at a speed of 300 r / min for 1.5 h; among them, the mass ratio of alkali lignin to inorganic particles is 1:0.75, and the mass ratio of hydrophobic modifier to inorganic particles is 0.5:1;

[0039] Remove the supernatant, wash the remaining solid with water and freeze-dry it to obtain radiative cooling particles.

[0040] The particle size of the radiative cooling particles obtained in this example is 3 - 10 μm.

[0041] 3) Preparation of the coating layer: Mix 22 parts of styrene-butadiene rubber, 60 parts of PVC resin, 10 parts of polydopamine-modified montmorillonite-nano calcium carbonate composite material, 2 parts of radiative cooling particles, 2 parts of stabilizer, and 3 parts of flame retardant by mass, and heat to a molten state to obtain a coating layer in a molten state;

[0042] Coating: Coat the core wire with the coating layer in a molten state to obtain rubber PVC coated yarn.

[0043] Example 2

[0044] A preparation process of rubber PVC coated yarn, comprising the following steps:

[0045] 1) Preparation of polydopamine-modified montmorillonite-nano calcium carbonate composite material:

[0046] Take montmorillonite, add water to prepare a suspension, ultrasonically treat at 45 °C for 1 h, add cetyltrimethylammonium bromide, and raise the temperature to 72 °C; add calcium chloride, control the temperature at 40 - 60 °C, then introduce a mixed gas of carbon dioxide and nitrogen with a volume ratio of 7:3, age, filter, and calcine the filter residue in a carbon dioxide atmosphere at a calcination temperature of 400 °C to obtain montmorillonite-nano calcium carbonate material; among them, the mass ratio of montmorillonite, water, cetyltrimethylammonium bromide, and calcium chloride is 11:30:4:13;

[0047] Disperse the montmorillonite-nano calcium carbonate material with a mass ratio of 7:1 and dopamine hydrochloride in Tris buffer solution, sonicate for 1 h, stir and react at 60 °C for 6 h. After the reaction, separate the solid and dry it to obtain the polydopamine-modified montmorillonite-nano calcium carbonate composite material.

[0048] 2) Preparation of radiative cooling particles:

[0049] Disperse inorganic particles TiO 2 , ZnO (mass ratio 1:1.5) in an ethanol aqueous solution to form a dispersion;

[0050] Then add alkali lignin, hydrophobic modifier methyltrimethoxysilane, and cellulose, adjust the pH to 7.5, and stir at 60 °C at a speed of 400 r / min for 0.5 h; among them, the mass ratio of alkali lignin to inorganic particles is 1:1, the mass ratio of hydrophobic modifier to inorganic particles is 1:1, and the mass ratio of cellulose to inorganic particles is 0.5:1;

[0051] Remove the supernatant, wash the remaining solid with water and freeze-dry it to obtain radiative cooling particles.

[0052] The particle size of the radiative cooling particles obtained in this example is 3 - 8 μm.

[0053] 3) Preparation of the coating layer: Mix 20 parts of nitrile rubber with an acrylonitrile content of 31 - 35 wt%, 20 parts of isoprene rubber, 50 parts of PVC resin, 4 parts of polydopamine-modified montmorillonite-nano calcium carbonate composite material, 12 parts of radiative cooling particles, 0.75 part of stabilizer, and 1.5 parts of flame retardant by mass, and heat to a molten state to obtain a coating layer in a molten state;

[0054] Coating: Coat the core wire with the coating layer in a molten state to obtain a rubber PVC coated yarn.

[0055] Example 3

[0056] A preparation process of a rubber PVC coated yarn, comprising the following steps:

[0057] 1) Preparation of polydopamine-modified montmorillonite-nano calcium carbonate composite material:

[0058] Montmorillonite was added with water to prepare a suspension, ultrasonicated at 50 °C for 2 h, cetyltrimethylammonium bromide was added, and the temperature was raised to 70 °C; calcium chloride was added, the temperature was controlled at 60 °C, and then a mixed gas of carbon dioxide and nitrogen with a volume ratio of 8:2 was introduced, aged, filtered, and the filter residue was calcined in a carbon dioxide atmosphere at a calcination temperature of 500 °C to obtain montmorillonite-nano calcium carbonate material; wherein, the mass ratio of montmorillonite, water, cetyltrimethylammonium bromide, and calcium chloride is 12:50:5:12;

[0059] The montmorillonite-nano calcium carbonate material and dopamine hydrochloride with a mass ratio of 18:1 were dispersed in Tris buffer solution, ultrasonicated for 1 h, stirred and reacted at 50 °C for 8 h. After the reaction, the solid was separated and dried to obtain polydopamine-modified montmorillonite-nano calcium carbonate composite material.

[0060] 2) Preparation of radiative cooling particles:

[0061] Inorganic particles TiO 2 、BaSO 4 、MgO (mass ratio 1:1:1) were dispersed in an ethanol aqueous solution to form a dispersion;

[0062] Then alkali lignin, hydrophobic modifier cetyltrimethoxysilane, and cellulose were added, and the pH was adjusted to neutral to weakly alkaline, and stirred at 50 °C at a rotation speed of 250 r / min for 1 h; wherein, the mass ratio of alkali lignin to inorganic particles is 1:2, the mass ratio of hydrophobic modifier to inorganic particles is 3:1, and the mass ratio of cellulose to inorganic particles is 1:1;

[0063] The supernatant was removed, and the remaining solid was washed with water and freeze-dried to obtain radiative cooling particles.

[0064] The particle size of the radiative cooling particles obtained in this example is 5 - 10 μm.

[0065] 3) Preparation of the coating layer: 25 parts of ethylene-propylene rubber, 42 parts of PVC resin, 15 parts of polydopamine-modified montmorillonite-nano calcium carbonate composite material, 5 parts of radiative cooling particles, 1.5 parts of stabilizer, and 2 parts of flame retardant were mixed evenly by mass and heated to a molten state to obtain a coating layer in a molten state;

[0066] Coating: Coating the core wire with the coating layer in a molten state to obtain a rubber PVC coated yarn.

[0067] Example 4

[0068] A preparation process of a rubber PVC coated yarn, comprising the following steps:

[0069] 1) Preparation of polydopamine-modified montmorillonite-nano calcium carbonate composite material:

[0070] Montmorillonite is added with water to prepare a suspension, ultrasonicated at 60 °C for 2 h, cetyltrimethylammonium bromide is added, and the temperature is raised to 78 °C; calcium chloride is added, the temperature is controlled at 55 °C, and then a mixed gas of carbon dioxide and nitrogen with a volume ratio of 7:3 is introduced, aged, filtered, and the filter residue is calcined in a carbon dioxide atmosphere at a calcination temperature of 450 °C to obtain a montmorillonite-nano calcium carbonate material; wherein, the mass ratio of montmorillonite, water, cetyltrimethylammonium bromide, and calcium chloride is 10:40:3:13;

[0071] The montmorillonite-nano calcium carbonate material with a mass ratio of 15:1 and hydrochloric acid dopamine are dispersed in Tris buffer solution, ultrasonicated for 1 h, stirred and reacted at 40 °C for 7 h. After the reaction, the solid is separated and dried to obtain a polydopamine-modified montmorillonite-nano calcium carbonate composite material.

[0072] 2) Preparation of radiative cooling particles:

[0073] One or more of inorganic particles TiO 2 , MgO (mass ratio 1.5:1) are dispersed in an ethanol aqueous solution to form a dispersion;

[0074] Then alkali lignin, hydrophobic modifier octyltrimethoxysilane, and cellulose are added, the pH is adjusted to neutral to weakly alkaline, and stirred at 45 °C at a rotation speed of 400 r / min for 1 h; wherein, the mass ratio of alkali lignin to inorganic particles is 1:2.5, the mass ratio of hydrophobic modifier to inorganic particles is 4.5:1, and the mass ratio of cellulose to inorganic particles is 1.8:1;

[0075] The upper clear liquid is removed, and the remaining solid is washed with water and freeze-dried to obtain radiative cooling particles.

[0076] The particle size of the radiative cooling particles obtained in this example is 5-9 μm.

[0077] 3) Preparation of the coating layer: 15 parts of chloroprene rubber, 20 parts of ethylene-propylene rubber, 45 parts of PVC resin, 6 parts of polydopamine-modified montmorillonite-nano calcium carbonate composite material, 8 parts of radiative cooling particles, 1 part of stabilizer, and 3.5 parts of flame retardant are mixed evenly by mass and heated to a molten state to obtain a coating layer in a molten state;

[0078] Coating: Coating the core wire with the coating layer in a molten state to obtain a rubber PVC coated yarn.

[0079] Example 5

[0080] A preparation process of a rubber PVC coated yarn, comprising the following steps:

[0081] 1) Preparation of polydopamine-modified montmorillonite-nano calcium carbonate composite material:

[0082] Take montmorillonite and add water to prepare a suspension. Ultrasonic it at 50 °C for 1.5 h, add cetyltrimethylammonium bromide, and raise the temperature to 75 °C; add calcium chloride, control the temperature at 55 °C, then introduce a mixed gas of carbon dioxide and nitrogen with a volume ratio of 7:3, age, filter, and calcine the filter residue in a carbon dioxide atmosphere at a calcination temperature of 400 °C to obtain montmorillonite-nano calcium carbonate material; among them, the mass ratio of montmorillonite, water, cetyltrimethylammonium bromide, and calcium chloride is 10:40:3:13;

[0083] Disperse the montmorillonite-nano calcium carbonate material and dopamine hydrochloride with a mass ratio of 12:1 in Tris buffer solution, ultrasonic for 1 h, stir and react at 45 °C for 8 h. After the reaction, separate the solid and dry it to obtain the polydopamine-modified montmorillonite-nano calcium carbonate composite material.

[0084] 2) Preparation of radiative cooling particles:

[0085] Disperse inorganic particles TiO 2 , SiO 2 , ZnO (mass ratio 1.5:1:1) in an ethanol aqueous solution to form a dispersion;

[0086] Then add alkali lignin, hydrophobic modifier cetyltrimethoxysilane, and cellulose, adjust the pH to 7.5, and stir at 4 °C at a rotation speed of 450 r / min for 1 h; among them, the mass ratio of alkali lignin to inorganic particles is 1:1.5, the mass ratio of hydrophobic modifier to inorganic particles is 2.5:1, and the mass ratio of cellulose to inorganic particles is 1.2:1;

[0087] Remove the supernatant, wash the remaining solid with water and freeze-dry it to obtain radiative cooling particles.

[0088] The particle size of the radiative cooling particles obtained in this example is 4 - 7.5 μm.

[0089] 3) Preparation of the coating layer: Mix 30 parts of chloroprene rubber, 50 parts of PVC resin, 8 parts of polydopamine-modified montmorillonite-nano calcium carbonate composite material, 7 parts of radiative cooling particles, 1.5 parts of stabilizer, and 2.5 parts of flame retardant by mass, and heat to a molten state to obtain a coating layer in a molten state;

[0090] Coating: Coat the core wire with the coating layer in a molten state to obtain rubber PVC coated yarn.

[0091] Comparative Example 1 (without polydopamine-modified montmorillonite-nano calcium carbonate composite material)

[0092] A preparation process of rubber PVC coated yarn, comprising the following steps:

[0093] 1) Preparation of radiative cooling particles:

[0094] Disperse inorganic particles TiO 2 and SiO 2 (mass ratio 1:1) in an ethanol aqueous solution to form a dispersion;

[0095] Then add alkali lignin and aminopropyl ethoxysilane, adjust the pH to neutral, and stir at 40 °C at a rotation speed of 300 r / min for 1.5 h; wherein, the mass ratio of alkali lignin to inorganic particles is 1:0.75, and the mass ratio of aminopropyl ethoxysilane to inorganic particles is 0.5:1;

[0096] Remove the supernatant, wash the remaining solid with water and freeze-dry to obtain radiative cooling particles.

[0097] The particle size of the radiative cooling particles obtained in this example is 3 - 10 μm.

[0098] 2) Preparation of the coating layer: Mix 22 parts of rubber, 60 parts of PVC resin, 2 parts of radiative cooling particles, 2 parts of stabilizer, and 3 parts of flame retardant by mass, and heat to a molten state to obtain a coating layer in a molten state;

[0099] Coating: Coat the core wire with the coating layer in a molten state to obtain rubber PVC coated yarn.

[0100] Comparative Example 2 (Montmorillonite - Nano Calcium Carbonate Material without Polydopamine Modification)

[0101] A preparation process of rubber PVC coated yarn, comprising the following steps:

[0102] 1) Preparation of polydopamine-modified montmorillonite - nano calcium carbonate composite material:

[0103] Take montmorillonite, add water to prepare a suspension, ultrasonicate at 40 °C for 1.5 h, add cetyltrimethylammonium bromide, and raise the temperature to 75 °C; add calcium chloride, control the temperature at 45 °C, then introduce a mixed gas of carbon dioxide and nitrogen with a volume ratio of 6:4, age, filter, and calcine the filter residue in a carbon dioxide atmosphere at a calcination temperature of 350 °C to obtain montmorillonite - nano calcium carbonate material; wherein, the mass ratio of montmorillonite, water, cetyltrimethylammonium bromide, and calcium chloride is 10:50:3:12.

[0104] 2) Preparation of radiative cooling particles:

[0105] Disperse inorganic particles TiO 2 and SiO 2Dispersed in an ethanol aqueous solution in a mass ratio of 1:1 to form a dispersion;

[0106] Then add alkali lignin and aminopropyl ethoxysilane, adjust the pH to neutral, and stir at 300 r / min for 1.5 h at 40 °C; wherein, the mass ratio of alkali lignin to inorganic particles is 1:0.75 - 3, and the mass ratio of aminopropyl ethoxysilane to inorganic particles is 0.5:1;

[0107] Remove the supernatant, wash the remaining solid with water, and freeze-dry to obtain radiation cooling particles.

[0108] The radiation cooling particles obtained in this example have a particle size of 3 - 10 μm.

[0109] 3) Preparation of the coating layer: Mix 22 parts of rubber, 60 parts of PVC resin, 10 parts of montmorillonite-nano calcium carbonate composite material, 2 parts of radiation cooling particles, 2 parts of stabilizer, and 3 parts of flame retardant by mass, and heat to a molten state to obtain a molten coating layer;

[0110] Coating: Coat the core wire with the molten coating layer to obtain a rubber PVC coated yarn.

[0111] Comparative Example 3 (without nitrogen gas mixing)

[0112] A preparation process of a rubber PVC coated yarn, comprising the following steps:

[0113] 1) Preparation of poly-dopamine modified montmorillonite-nano calcium carbonate composite material:

[0114] Take montmorillonite and add water to prepare a suspension, ultrasonicate at 40 °C for 1.5 h, add cetyltrimethylammonium bromide, and raise the temperature to 75 °C; add calcium chloride, control the temperature at 45 °C, then introduce carbon dioxide gas, age, filter, and calcine the filter residue in a carbon dioxide atmosphere at a calcination temperature of 350 °C to obtain a montmorillonite-nano calcium carbonate material; wherein, the mass ratio of montmorillonite, water, cetyltrimethylammonium bromide, and calcium chloride is 10:50:3:12;

[0115] Disperse the montmorillonite-nano calcium carbonate material and hydrochloric acid dopamine with a mass ratio of 5:1 in Tris buffer solution, ultrasonicate for 0.5 h, stir and react at 40 °C for 10 h. After the reaction, separate the solid and dry to obtain the poly-dopamine modified montmorillonite-nano calcium carbonate composite material.

[0116] 2) Preparation of radiation cooling particles:

[0117] Disperse inorganic particles TiO 2 , SiO 2 in an ethanol aqueous solution to form a dispersion;

[0118] Then add alkali lignin and aminopropyl ethoxysilane, adjust the pH to neutral, and stir at 300 r / min for 1.5 h at 40 °C; among them, the mass ratio of alkali lignin to inorganic particles is 1:0.75 - 3, and the mass ratio of aminopropyl ethoxysilane to inorganic particles is 0.5:1;

[0119] Remove the supernatant, wash the remaining solid with water, and freeze-dry it to obtain the radiative cooling particles.

[0120] The particle size of the radiative cooling particles obtained in this example is 3 - 10 μm.

[0121] 3) Preparation of the coating layer: Mix 22 parts of rubber, 60 parts of PVC resin, 10 parts of polydopamine-modified montmorillonite-nano calcium carbonate composite material, 2 parts of radiative cooling particles, 2 parts of stabilizer, and 3 parts of flame retardant by mass, and heat to the molten state to obtain the coating layer in the molten state;

[0122] Coating: Coat the core wire with the coating layer in the molten state to obtain the rubber PVC coated yarn.

[0123] Comparative Example 4 (without radiative cooling particles)

[0124] A preparation process of rubber PVC coated yarn, comprising the following steps:

[0125] 1) Preparation of polydopamine-modified montmorillonite-nano calcium carbonate composite material:

[0126] Take montmorillonite and add water to prepare a suspension, ultrasonicate at 40 °C for 1.5 h, add cetyltrimethylammonium bromide, and raise the temperature to 75 °C; add calcium chloride, control the temperature at 45 °C, then introduce a mixed gas of carbon dioxide and nitrogen with a volume ratio of 6:4, age, filter, and calcine the filter residue in a carbon dioxide atmosphere at a calcination temperature of 350 °C to obtain the montmorillonite-nano calcium carbonate material; among them, the mass ratio of montmorillonite, water, cetyltrimethylammonium bromide, and calcium chloride is 10:50:3:12;

[0127] Disperse the montmorillonite-nano calcium carbonate material with a mass ratio of 5:1 and dopamine hydrochloride in Tris buffer solution, ultrasonicate for 0.5 h, stir and react at 40 °C for 10 h, after the reaction, separate the solid and dry it to obtain the polydopamine-modified montmorillonite-nano calcium carbonate composite material.

[0128] 2) Preparation of the coating layer: Mix 22 parts of rubber, 60 parts of PVC resin, 10 parts of polydopamine-modified montmorillonite-nano calcium carbonate composite material, 2 parts of radiative cooling particles, 2 parts of stabilizer, and 3 parts of flame retardant by mass, and heat to the molten state to obtain the coating layer in the molten state;

[0129] Coating: Coating the core wire with a molten coating layer to obtain rubber PVC coated yarn.

[0130] Comparative Example 5 (Radiative cooling particles not treated with alkali lignin)

[0131] A preparation process of rubber PVC coated yarn, comprising the following steps:

[0132] 1) Preparation of polydopamine modified montmorillonite-nano calcium carbonate composite:

[0133] Take montmorillonite and add water to prepare a suspension, ultrasonicate at 40 °C for 1.5 h, add cetyltrimethylammonium bromide, and raise the temperature to 75 °C; add calcium chloride, control the temperature at 45 °C, then introduce a mixed gas of carbon dioxide and nitrogen with a volume ratio of 6:4, age, filter, and calcine the filter residue in a carbon dioxide atmosphere at a calcination temperature of 350 °C to obtain montmorillonite-nano calcium carbonate material; wherein, the mass ratio of montmorillonite, water, cetyltrimethylammonium bromide, and calcium chloride is 10:50:3:12;

[0134] Disperse the modified montmorillonite-nano calcium carbonate material and dopamine hydrochloride with a mass ratio of 5:1 in Tris buffer solution, ultrasonicate for 0.5 h, stir and react at 40 °C for 10 h. After the reaction, separate the solid and dry it to obtain polydopamine modified montmorillonite-nano calcium carbonate composite.

[0135] 2) Preparation of radiative cooling particles:

[0136] Disperse inorganic particles TiO 2 , SiO 2 (mass ratio 1:1) in an ethanol aqueous solution to form a dispersion;

[0137] Then add aminopropyltriethoxysilane and stir at a rotation speed of 300 r / min at 40 °C for 1.5 h; wherein, the mass ratio of aminopropyltriethoxysilane to inorganic particles is 0.5:1;

[0138] Remove the supernatant, wash the remaining solid with water and freeze-dry to obtain radiative cooling particles.

[0139] The particle size of the radiative cooling particles obtained in this example is 3 - 10 μm.

[0140] 3) Preparation of coating layer: Mix 22 parts of rubber, 60 parts of PVC resin, 10 parts of polydopamine modified montmorillonite-nano calcium carbonate composite, 2 parts of radiative cooling particles, 2 parts of stabilizer, and 3 parts of flame retardant by mass, heat to a molten state to obtain a molten coating layer;

[0141] Coating: Coating the core wire with a molten coating layer to obtain rubber PVC coated yarn.

[0142] Comparative Example 6 (radiative cooling particles not treated with a hydrophobic modifier)

[0143] A preparation process of rubber PVC coated yarn, comprising the following steps:

[0144] 1) Preparation of polydopamine modified montmorillonite-nano calcium carbonate composite:

[0145] Take montmorillonite and add water to prepare a suspension, ultrasonic for 1.5 h at 40 °C, add cetyltrimethylammonium bromide, and raise the temperature to 75 °C; add calcium chloride, control the temperature at 45 °C, then introduce a mixed gas of carbon dioxide and nitrogen with a volume ratio of 6:4, age, filter, and calcine the filter residue in a carbon dioxide atmosphere at a calcination temperature of 350 °C to obtain montmorillonite-nano calcium carbonate material; wherein, the mass ratio of montmorillonite, water, cetyltrimethylammonium bromide, and calcium chloride is 10:50:3:12;

[0146] Disperse the modified montmorillonite-nano calcium carbonate material and hydrochloric acid dopamine with a mass ratio of 5:1 in Tris buffer solution, ultrasonic for 0.5 h, stir and react at 40 °C for 10 h. After the reaction, separate the solid and dry it to obtain the polydopamine modified montmorillonite-nano calcium carbonate composite.

[0147] 2) Preparation of radiative cooling particles:

[0148] Disperse inorganic particles TiO 2 , SiO 2 (mass ratio 1:1) in an ethanol aqueous solution to form a dispersion;

[0149] Then add alkali lignin, adjust the pH to neutral, and stir at 300 r / min at 40 °C for 1.5 h; wherein, the mass ratio of alkali lignin to inorganic particles is 1:0.75 - 3;

[0150] Remove the supernatant, wash the remaining solid with water, and freeze-dry to obtain radiative cooling particles.

[0151] The particle size of the radiative cooling particles obtained in this example is 3 - 10 μm.

[0152] 3) Preparation of the coating layer: Mix 22 parts of rubber, 60 parts of PVC resin, 10 parts of polydopamine modified montmorillonite-nano calcium carbonate composite, 2 parts of radiative cooling particles, 2 parts of stabilizer, and 3 parts of flame retardant by mass, and heat to a molten state to obtain a molten coating layer;

[0153] Coating: The core wire is coated with a molten coating layer to obtain rubber PVC coated yarn.

[0154] Weaving and processing are carried out using the rubber PVC coated yarns obtained from the above-mentioned examples and comparative examples as warp and weft to obtain a sunshade fabric. The sunshade fabric obtained is tested for light fastness to sunlight, bending strength, and temperature. The test results are shown in Table 1 and Table 2.

[0155] The light fastness to sunlight is determined with reference to GB / T8427-2008 "Textiles - Tests for colour fastness - Colour fastness to artificial light: Xenon arc".

[0156] The bending strength is tested in accordance with GB / T9341-2000, with a downward pressing rate of 2 mm / min and a test temperature of 25 °C.

[0157] The temperature test method is as follows: Equal-intensity light is irradiated simultaneously on one side of the sunshade fabric of the example and the sunshade fabric of the comparative example. After irradiating for a period of time, the temperature on the other side of the sunshade fabric of the example and the sunshade fabric of the comparative example is detected.

[0158] Table 1 Test results of light fastness to sunlight and bending strength of examples and comparative examples

[0159] Light fastness Flexural strength (Mpa) Example 1 Grade 8 52.17 Example 2 Grade 8 54.75 Example 3 Grade 8 56.31 Example 4 Grade 8 55.63 Example 5 Grade 8 56.82 Comparative Example 1 Grade 6 39.51 Comparative Example 2 Grade 5 43.23 Comparative Example 3 Grade 6 42.70 Comparative Example 4 Grade 5 44.28 Comparative Example 5 Grade 5 45.14 Comparative Example 6 Grade 7 46.62

[0160] Table 2 Temperature test results of examples and comparative examples

[0161]

[0162] It can be seen from the data in Table 1 and Table 2 that the performance of the examples is better than that of the comparative examples. Compared with Comparative Examples 1-3, the polydopamine-modified montmorillonite-nano calcium carbonate composite material provided by the present invention can significantly improve the bending strength of the sunshade fabric, and also has a greater impact on the light fastness to sunlight and heat insulation performance. Among them, both polydopamine modification and nitrogen mixing have a greater impact on the aging resistance and bending strength of the polydopamine-modified montmorillonite-nano calcium carbonate composite material (the impact of polydopamine is greater); compared with Comparative Examples 4-6, the radiative cooling particles provided by the present invention can significantly improve the light fastness to sunlight and heat insulation performance of the sunshade fabric, and also have a greater impact on the bending strength. Among them, the alkali lignin treatment has a greater impact on the aging resistance and bending strength of the radiative cooling particles, and the hydrophobic modification has a greater impact on the heat insulation effect of the radiative cooling particles. The results show that the rubber PVC coated yarn obtained by the method of the present invention has excellent structural strength, aging resistance, and heat insulation effect, and when applied to the sunshade fabric, it can greatly improve the sunshade and cooling effect and service life.

[0163] The above embodiments merely represent the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, according to the technical solutions and concepts described above, various other corresponding changes and deformations can be made, and all such changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A process for preparing rubber PVC coated yarn, characterized in that: The following steps are involved: Preparation of the coating layer: the raw materials of the coating layer include 20-40 parts of rubber, 30-60 parts of PVC resin, 2-15 parts of polydopamine-modified montmorillonite-nano calcium carbonate composite material, 1-12 parts of radiation refrigeration particles, 0.5-2 parts of stabilizer, and 1-4 parts of flame retardant by weight; the raw materials are mixed evenly and heated to a molten state to obtain a molten coating layer; Coating: Coating the core wire with a molten coating layer to obtain rubber PVC coated yarn; Wherein, the preparation method of the polydopamine modified montmorillonite-nano calcium carbonate composite material is: Montmorillonite is added with water to prepare a suspension, subjected to ultrasonic treatment at 40-60°C for 1-2h, cetyl trimethyl ammonium bromide is added, and the temperature is raised to 70-80°C; calcium chloride is added, the temperature is controlled at 40-60°C, and then a mixed gas of carbon dioxide and nitrogen is introduced, aged, filtered, and the filter residue is roasted in a carbon dioxide atmosphere to obtain a montmorillonite-nano calcium carbonate material; the mass ratio of the montmorillonite, water, cetyl trimethyl ammonium bromide, and calcium chloride is (9-12): (20-50): (1-5): (10-13); the montmorillonite-nano calcium carbonate material and dopamine hydrochloride are dispersed in a Tris buffer solution, subjected to ultrasonic treatment for 0.5-1h, and the mass ratio of the montmorillonite-nano calcium carbonate material to dopamine hydrochloride is (3-20): 1; the reaction is stirred at 30-60°C for 6-12h, and after the reaction is completed, the solid is separated and dried to obtain a polydopamine-modified montmorillonite-nano calcium carbonate composite material; The preparation method of the radiation refrigeration particles is: Inorganic particles are dispersed in an ethanol aqueous solution to form a dispersion, and then alkaline lignin and a hydrophobic modifier are added, the pH is adjusted to be neutral to weakly alkaline, and the mixture is stirred at 30-60°C for a period of time, the upper clear liquid is removed, and the remaining solid is washed with water and dried to obtain radiation refrigeration particles; the inorganic particles include TiO2 and one or more of ZnO, MgO, SiO2, BaSO4, and Al2O3; and the hydrophobic modifier is a silane coupling agent.

2. The process for preparing a rubber PVC coated yarn according to claim 1, characterized in that: The volume ratio of carbon dioxide to nitrogen is (6-8): (2-4), and the calcination temperature is 300-500°C.

3. The process for preparing a rubber PVC coated yarn according to claim 1, characterized in that: The mass ratio of the alkali lignin to the inorganic particles is 1:(0.5-3); The mass ratio of the hydrophobic modifier to the inorganic particles is (0.1-5):

1.

4. The process for preparing a rubber PVC coated yarn according to claim 1, characterized in that: The stirring speed is 200-500 r / min, and the stirring time is 0.5-2 h; and the drying is freeze drying.

5. The process for preparing a rubber PVC coated yarn according to claim 1, characterized in that: The radiation refrigeration particles also include cellulose, and the cellulose is added simultaneously with the alkali lignin and the hydrophobic modifier.

6. The process for preparing a rubber PVC coated yarn according to claim 1, characterized in that: The particle size of the radiation cooling particles is 3-10 μm.

Images