A method for enhancing the modification effect of a silica / polydopamine composite on seaweed nonwoven fabric

Abstract

The application discloses a method for enhancing modification effect of a silica / polydopamine compound on seaweed non-woven fabric, and belongs to the technical field of textile printing and dyeing.The method is characterized by the following process: (1) a certain amount of silica and polydiallyl dimethyl ammonium chloride are added into deionized water, the concentrations of the two are 5 g / L and 0.125 g / L respectively, the mixture is ultrasonically treated for 10 min, and then is left to stand for 20 min, and then is centrifuged and washed with water to obtain pretreated silica; (2) the pretreated silica is added into a buffer aqueous solution containing hydrochloric acid dopamine, copper sulfate pentahydrate and hydrogen peroxide, the concentrations of the substances are 5 g / L, 2 g / L, 7.5 mmol / L and 29.4 mmol / L respectively, the mixture is left to stand at room temperature for 60 min after being uniformly mixed, and then is centrifuged and washed with water to obtain a silica / polydopamine compound; and (3) the silica / polydopamine compound and an adhesive are added into deionized water to obtain a modified dispersion liquid, the concentrations of the two are 2 g / L and 15 g / L respectively, and then the seaweed non-woven fabric is subjected to deposition modification at 60 DEG C under the condition of a bath ratio of 100:1 after the mixture is uniformly mixed.The test result shows that the silica / polydopamine compound obtained by the method can improve the color depth of the seaweed non-woven fabric, and can endow the seaweed non-woven fabric with stronger light-heat conversion capacity, and the modification effect is remarkably improved.

Description

Technical Field

[0001] This invention relates to a method for enhancing the modification effect of silica / polydopamine composites on seaweed nonwoven fabrics, belonging to the field of textile printing and dyeing technology. Background Technology

[0002] Silica is an abundant and stable inorganic non-metallic material. Its preparation methods are simple, particle size is controllable, it exhibits high mechanical strength, excellent chemical and thermal stability, and low cost, making it widely used in material modification, carrier construction, and other fields. In textile finishing, silica can be used to construct rich micro- and nano-rough structures on fabric surfaces through various methods such as impregnation, deposition, spraying, and padding, thereby regulating various properties and functions of the fabric.

[0003] Dopamine molecules are composed of amino groups linked to catechol groups via ethylamino groups, and are an organic base. Under suitable conditions, dopamine undergoes oxidative polymerization to generate a series of oligomers with different molecular weights, which further undergo cross-linking reactions to produce polydopamine with higher molecular weights, exhibiting excellent substrate adhesion, biocompatibility, and surface reactivity. The oxidative polymerization of dopamine is relatively flexible in terms of conditions and initiation systems, and can proceed efficiently under different acid-base environments and catalytic systems.

[0004] Seaweed nonwoven fabric is an environmentally friendly functional fabric made from seaweed fiber as its core raw material, belonging to the category of bio-based green materials. Its main raw material is sodium alginate extracted from brown algae such as kelp. This alginate is produced through a wet spinning process to create seaweed fiber, which is then processed into nonwoven fabric through hydroentangling, needle punching, and other techniques. The production process is safe and pollution-free. Seaweed nonwoven fabric features high liquid absorbency, natural antibacterial properties, and good biocompatibility, and is widely used in textile, medical, and other fields.

[0005] Studies have shown that the amino and hydroxyl groups in polydopamine molecules can form complexes with silanol groups on the surface of silica through various interactions, which can be used to modify seaweed nonwoven fabrics and further expand their applications. Summary of the Invention

[0006] This invention utilizes polydimethylammonium chloride to pretreat silica, and then adds dopamine hydrochloride for polymerization. This can improve the binding ability between silica and the generated polydopamine, so that the formed silica / polydopamine complex has a stronger modification effect on seaweed nonwoven fabrics.

[0007] This invention relates to the following: (1) Add a certain amount of silica and polydimethylammonium chloride to deionized water. The concentrations of silica and polydimethylammonium chloride are 5 g / L and 0.125 g / L, respectively. After ultrasonic treatment for 10 min, let stand for 20 min, centrifuge and wash with water to obtain pretreated silica. (2) Pretreated silica was added to a buffer solution with pH 8.5 containing dopamine hydrochloride, copper sulfate pentahydrate and hydrogen peroxide. The concentrations of each substance were 5 g / L, 2 g / L, 7.5 mmol / L and 29.4 mmol / L, respectively. After mixing, the mixture was allowed to stand at room temperature for 60 min, centrifuged and washed with water to obtain silica / polydopamine complex. (3) A modified dispersion was prepared by adding silica / polydopamine complex and binder to deionized water. The concentrations of the two were 2 g / L and 15 g / L, respectively. After mixing evenly, the seaweed nonwoven fabric was deposited and modified at 60 °C with a bath ratio of 100:1.

[0008] A certain amount of silica and polydiallyldimethylammonium chloride (PDMC) were added to deionized water at concentrations of 5 g / L and 0.125 g / L, respectively. After ultrasonic treatment for 10 min, the mixture was allowed to stand for 20 min, centrifuged, and washed with water to obtain pretreated silica. The PDMC used was a commercially available product with a molecular weight of 400,000-500,000. The pretreated silica was then added to a buffer solution with a pH of 8.5 containing dopamine hydrochloride, copper sulfate pentahydrate, and hydrogen peroxide at concentrations of 5 g / L, 2 g / L, 7.5 mmol / L, and 29.4 mmol / L, respectively. After mixing, the mixture was allowed to stand at room temperature for 60 min, centrifuged, and washed with water to obtain a silica / polydopamine composite. Pretreatment with PDMC alters the surface properties and stability of silica, enhancing its binding ability to dopamine hydrochloride, resulting in a silica / polydopamine composite with improved performance after polymerization. Finally, the silica / polydopamine complex and the binder were added to deionized water to prepare a modified dispersion with concentrations of 2 g / L and 15 g / L, respectively. After being mixed evenly, the seaweed nonwoven fabric was deposited and modified at 60 °C with a bath ratio of 100:1. Detailed Implementation

[0009] The present invention will now be illustrated by examples and comparative examples.

[0010] Example 1 (1) Add a certain amount of silica and polydimethylammonium chloride to deionized water. The concentrations of silica and polydimethylammonium chloride are 5 g / L and 0.125 g / L, respectively. After ultrasonic treatment for 10 min, let stand for 20 min, centrifuge and wash with water to obtain pretreated silica. (2) Pretreated silica was added to a buffer solution with pH 8.5 containing dopamine hydrochloride, copper sulfate pentahydrate and hydrogen peroxide. The concentrations of each substance were 5 g / L, 2 g / L, 7.5 mmol / L and 29.4 mmol / L, respectively. After mixing, the mixture was allowed to stand at room temperature for 60 min, centrifuged and washed with water to obtain silica / polydopamine complex. (3) A modified dispersion was prepared by adding silica / polydopamine complex and binder to deionized water. The concentrations of the two were 2 g / L and 15 g / L, respectively. After mixing evenly, the seaweed nonwoven fabric was deposited and modified at 60 °C with a bath ratio of 100:1.

[0011] Comparative Example 1 (1) Untreated silica was added to a buffer solution containing dopamine hydrochloride, copper sulfate pentahydrate and hydrogen peroxide at pH 8.5. The concentrations of each substance were 5 g / L, 2 g / L, 7.5 mmol / L and 29.4 mmol / L, respectively. After mixing, the mixture was allowed to stand at room temperature for 60 min, centrifuged and washed with water to obtain silica / polydopamine complex. (2) A modified dispersion was prepared by adding silica / polydopamine complex and binder to deionized water. The concentrations of the two were 2 g / L and 15 g / L, respectively. After mixing evenly, the seaweed nonwoven fabric was deposited and modified at 60 °C with a bath ratio of 100:1.

[0012] The color L-values ​​of the seaweed nonwoven fabrics obtained in Example 1 and Comparative Example 1 were tested and found to be 55.21 and 56.72, respectively. These values ​​were significantly lower than the L-value of the undeposited silica / polydopamine seaweed nonwoven fabric (94.59), which is attributed to the color exhibited by polydopamine. In contrast, the composite obtained in Example 1 contained more polydopamine, resulting in a more significant decrease in the L-value of the modified seaweed nonwoven fabric compared to Comparative Example 1.

[0013] The photothermal heating capacity of the seaweed nonwoven fabrics obtained in Example 1 and Comparative Example 1 was tested. Under the same light conditions, their surface temperatures rose to 53.4 °C and 49.9 °C, respectively, which were significantly higher than the surface temperature of the seaweed nonwoven fabric without silica / polydopamine deposition (29.6 °C). This is because polydopamine can effectively absorb light energy and convert it into heat energy. In comparison, the composite obtained in Example 1 contains more polydopamine, and the temperature increase of its modified seaweed nonwoven fabric is more significant than that of Comparative Example 1.

Claims

1. A method for enhancing the modification effect of silica / polydopamine composites on seaweed nonwoven fabrics, characterized in that... The following process is adopted: (1) Add a certain amount of silica and polydimethylammonium chloride to deionized water. The concentrations of silica and polydimethylammonium chloride are 5 g / L and 0.125 g / L, respectively. After ultrasonic treatment for 10 min, let stand for 20 min, centrifuge and wash with water to obtain pretreated silica. (2) Pretreated silica was added to a buffer solution with pH 8.5 containing dopamine hydrochloride, copper sulfate pentahydrate and hydrogen peroxide. The concentrations of each substance were 5 g / L, 2 g / L, 7.5 mmol / L and 29.4 mmol / L, respectively. After mixing, the mixture was allowed to stand at room temperature for 60 min, centrifuged and washed with water to obtain silica / polydopamine complex. (3) A modified dispersion was prepared by adding silica / polydopamine complex and binder to deionized water. The concentrations of the two were 2 g / L and 15 g / L, respectively. After mixing evenly, the seaweed nonwoven fabric was deposited and modified at 60 °C with a bath ratio of 100:1.