CN109181451B - Preparation method of polyacrylate/MOFs composite leather finishing agent - Google Patents

Preparation method of polyacrylate/MOFs composite leather finishing agent Download PDF

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CN109181451B
CN109181451B CN201811003711.9A CN201811003711A CN109181451B CN 109181451 B CN109181451 B CN 109181451B CN 201811003711 A CN201811003711 A CN 201811003711A CN 109181451 B CN109181451 B CN 109181451B
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polyacrylate
mofs
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leather finishing
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CN109181451A (en
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马建中
杨帆
鲍艳
张文博
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Shaanxi University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
    • C08G83/008—Supramolecular polymers
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C11/00—Surface finishing of leather
    • C14C11/003—Surface finishing of leather using macromolecular compounds

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Abstract

The invention relates to a preparation method of a polyacrylate/MOFs composite leather finishing agent. Compared with leather samples coated by pure polyacrylate, the tensile strength, the tearing strength, the bursting strength, the water resistance and the water vapor permeability of the leather samples coated by the composite leather coating agent prepared by the invention are respectively improved by 5.65%, 10.34%, 21.43%, 8.62% and 5.89%.

Description

Preparation method of polyacrylate/MOFs composite leather finishing agent
Technical Field
The invention relates to the technical field of preparation of leather finishing agents, in particular to a preparation method of a polyacrylate/MOFs composite leather finishing agent.
Background
MOFs are coordination polymers formed by self-assembly of multidentate organic ligands (mostly aromatic polyacids or polybases) containing oxygen, nitrogen, etc. and transition metal ions. The role of metal cations in MOFs materials is, on the one hand, to serve as a junction to provide a backbone and, on the other hand, to form branches in the backbone, thereby enhancing the physical properties (e.g., porosity and chirality) of the MOFs materials. The material not only has a crystal structure similar to zeolite molecular sieve, but also can obtain pore canals and holes with different sizes through the directional design of topological structure and the expansion of organic functional groups, and has unique properties of light, electricity, magnetism and the like. Therefore, the composite material also shows attractive application prospect in the composite of the membrane material and the polymer. At present, the commonly used preparation methods of MOFs materials include a solvothermal method (hydrothermal method), a microwave method, a solvent volatilization method, and the like. Wherein, the solvothermal method has the advantages of simple operation, high purity of the synthesized material, uniform particle size and the like.
The polyacrylate is one of the most widely applied film forming materials in leather finishing, and has the following main characteristics: excellent bending resistance, good dry and wet wiping performance, excellent light resistance and aging resistance, and good compatibility with other materials such as resin, pigment paste, wiping paste, casein and the like. But the polyacrylate is compact in film forming, and a compact film is formed on the surface of the leather after the polyacrylate is coated, so that a channel for diffusing water vapor molecules of a human body to the outside is blocked, the sanitary performance is reduced, and the wearing comfort of leather products is further influenced. In addition, the polyacrylate finishing agent has the defects of hot sticking, cold brittleness, organic solvent intolerance and the like, and further application of the polyacrylate finishing agent is limited. Therefore, researchers have made a lot of work on how to improve the comprehensive performance of polyacrylate coatings, mainly including compounding porous materials with polyacrylate emulsions and modifying polyacrylate by using protein film-forming materials with good hygienic properties.
Disclosure of Invention
The invention aims to provide a preparation method of a polyacrylate/MOFs composite leather finishing agent, and a leather sample coated by the composite leather finishing agent prepared by the method has good sanitary performance (water vapor permeability) and excellent water resistance and mechanical properties.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a polyacrylate/MOFs composite leather finishing agent comprises the following steps:
the method comprises the following steps: preparing metal organic framework compound Materials (MOFs);
step two: preparing a polyacrylate/MOFs composite leather finishing agent.
The steps are specifically as follows:
the method comprises the following steps: preparation of metal organic framework compound Materials (MOFs): (wherein, MOFs materials can be prepared by three methods of (a), (b) and (c))
(a) First, ZrCl is added4And terephthalic acid are respectively dissolved in 20mL of N, N-Dimethylformamide (DMF), then the two solutions are mixed and transferred into a reaction kettle for hydrothermal reaction, and a filter membrane is used for filtration after the reaction is finished; then, placing the product in 2-40 mL of DMF, stirring for 20-28 h at room temperature, and filtering again by using a filter membrane; further placing the product in 50-100 mL of methanol, stirring for 20-28 h at room temperature, filtering with a filter membrane again, and finally drying the product in air to obtain the MOFs material;
(b) first, ZrOCl is added2‧8H2O and fumaric acidRespectively dissolving the two solutions in 30 mL of DMF and 3 mL of formic acid, mixing the two solutions, transferring the mixed solution into a reaction kettle for hydrothermal reaction, filtering the reaction product by using a filter membrane after the reaction is finished, washing the product by using DMF and acetone for a plurality of times respectively, and finally drying the product in the air to obtain the MOFs material;
(c) mixing zinc acetate and 5-amino isophthalic acid, dissolving in 20mL of deionized water, adding acetic acid to adjust the pH to 3.6-4.2, magnetically stirring for 20 min, transferring the solution to a reaction kettle, carrying out hydrothermal reaction, filtering with a filter membrane, centrifuging and washing the product, and drying in the air to obtain the MOFs material;
step two: preparation of polyacrylate/MOFs composite leather finishing agent:
firstly, ultrasonically dispersing the MOFs material prepared in the step one in deionized water to obtain a suspension of the MOFs material, then adding the suspension into a polyacrylate emulsion, stirring and blending to obtain the polyacrylate/MOFs composite leather finishing agent.
Further, in the step (a) of the first step, ZrCl4The mass ratio of the ZrCl to the terephthalic acid is 1: 0.5-1: 2, wherein the ZrCl is4The dosage of the composition is 0.7-2 g; the temperature of the hydrothermal reaction is 100-150 ℃, and the reaction time is 20-28 h.
Further, in the step (b) of the first step, ZrOCl2‧8H2The mass ratio of O to fumaric acid is 1: 1-1: 3, wherein ZrOCl2‧8H2The dosage of O is 0.1-0.5 g; the temperature of the hydrothermal reaction is 80-120 ℃, and the reaction time is 20-28 h.
Further, in the step (c) of the first step, the mass ratio of zinc acetate to 5-amino isophthalic acid is 1: 0.5-1: 2.5, wherein the amount of zinc acetate is 0.05-0.2 g; the temperature of the hydrothermal reaction is 150-200 ℃, and the reaction time is 5-6 d.
Further, in the second step, the time of ultrasonic dispersion is 10-20 min; the using amount of the deionized water is 50 percent of the mass of the polyacrylate emulsion; the solid content of the polyacrylate emulsion was 33%; the dosage of the MOFs material is 0.25-3% of the solid content of the polyacrylate emulsion.
Further, in the second step, the blending temperature of the suspension of the MOFs material and the polyacrylate emulsion is 75-85 ℃, the stirring speed is 300 r/min, and the blending time is 4-8 h.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, by utilizing the characteristics of large specific surface area and pore channel advantages of MOFs materials, a large number of interface pores are formed in the polyacrylate leather finishing agent, so that the sanitation performance of the polyacrylate leather finishing agent is improved. Compared with a pure polyacrylate leather finishing agent, the tensile strength, the tearing strength, the bursting strength, the water resistance and the water vapor permeability of a leather sample coated by the composite leather finishing agent prepared by the invention are respectively improved by 5.65%, 10.34%, 21.43%, 8.62% and 5.89%.
Drawings
FIG. 1 is an SEM photograph of MOFs material (a) ZrCl is used4And (b) adopting ZrOCl2‧8H2The MOFs material is prepared by taking O and fumaric acid as raw materials, and (c) the MOFs material is prepared by taking zinc acetate and 5-amino isophthalic acid as raw materials.
Detailed Description
The preparation method of the polyacrylate/MOFs composite leather finishing agent is further described by specific examples.
Example 1
(1) Preparation of MOFs materials
0.7 g of ZrCl4And 0.35 g of terephthalic acid are respectively dissolved in 20mL of N, N-Dimethylformamide (DMF), then the two solutions are mixed and transferred into a reaction kettle, hydrothermal reaction is carried out for 20h at 150 ℃, then the filtration membrane is used for filtration, the product is placed in 2 mL of DMF, stirring is carried out for 28h at room temperature, then filtration is carried out again by using the filtration membrane, further the product is placed in 50 mL of methanol, stirring is carried out for 28h at room temperature, then filtration is carried out again by using the filtration membrane, and then the product is dried in the air, thus obtaining the MOFs material.
(2) Preparation of polyacrylate/MOFs composite leather finishing agent
Ultrasonically dispersing the MOFs material in deionized water for 15 min to obtain a suspension of the MOFs material, then adding the suspension into a polyacrylate emulsion, and stirring at the temperature of 80 ℃ at the speed of 300 r/min for 5h to blend the suspension, so as to obtain the polyacrylate/MOFs composite leather finishing agent. (wherein, the mass of the deionized water is 50 percent of that of the polyacrylate emulsion, the solid content of the polyacrylate emulsion is 33 percent, and the dosage of the MOFs material is 0.5 percent of that of the polyacrylate emulsion.)
Example 2
(1) Preparation of MOFs materials
0.2g of ZrOCl2‧8H2And dissolving O and 0.5 g fumaric acid in 30 mL of DMF and 3 mL of formic acid respectively, mixing the two solutions, transferring the two solutions into a reaction kettle, carrying out hydrothermal reaction at 120 ℃ for 20h, filtering the reaction product by using a filter membrane, washing the product by using DMF and acetone respectively for several times, and drying the product in the air to obtain the MOFs material.
(2) Preparation of polyacrylate/MOFs composite leather finishing agent
Ultrasonically dispersing MOFs material in deionized water for 20 min to obtain a suspension of the MOFs material, then adding the suspension into a polyacrylate emulsion, and stirring at the temperature of 85 ℃ at the speed of 300 r/min for 4h to blend the suspension, thereby obtaining the polyacrylate/MOFs composite leather finishing agent. Wherein the mass of the deionized water is 50% of that of the polyacrylate emulsion, the solid content of the polyacrylate emulsion is 33%, and the dosage of the MOFs material is 0.25% of that of the polyacrylate emulsion.
Example 3
(1) Preparation of MOFs materials
Mixing 0.1 g of zinc acetate and 0.1 g of 5-amino isophthalic acid, dissolving in 20mL of deionized water, adding acetic acid to adjust the pH value to 3.6, magnetically stirring for 20 min, transferring the solution to a reaction kettle, carrying out hydrothermal reaction for 5d at 150 ℃, centrifuging and washing the product for several times, and drying in the air to obtain the MOFs material.
(2) Preparation of polyacrylate/MOFs composite leather finishing agent
Ultrasonically dispersing MOFs material in deionized water for 20 min to obtain a suspension of the MOFs material, then adding the suspension into a polyacrylate emulsion, and stirring at the temperature of 75 ℃ at the speed of 300 r/min for 8h to blend the suspension, thereby obtaining the polyacrylate/MOFs composite leather finishing agent. Wherein the mass of the deionized water is 50% of that of the polyacrylate emulsion, the solid content of the polyacrylate emulsion is 33%, and the MOFs material is 2% of that of the polyacrylate emulsion.
Example 4
(1) Preparation of MOFs materials
2g of ZrCl4And 4 g of terephthalic acid are respectively dissolved in 20mL of N, N-Dimethylformamide (DMF), then the two solutions are mixed and transferred into a reaction kettle, hydrothermal reaction is carried out for 28h at 100 ℃, then the filtration membrane is used for filtration, the product is placed in 40mL of DMF, stirring is carried out for 24h at room temperature, then the filtration membrane is used again for filtration, further the product is placed in 80 mL of methanol, stirring is carried out for 20h at room temperature, then the filtration membrane is used again for filtration, and then the product is dried in the air, thus obtaining the MOFs material.
(2) Preparation of polyacrylate/MOFs composite leather finishing agent
Ultrasonically dispersing MOFs material in deionized water for 10 min to obtain suspension of the MOFs material, then adding the suspension into polyacrylate emulsion, and stirring at the temperature of 80 ℃ at the speed of 300 r/min for 6 h to blend the suspension, thereby obtaining the polyacrylate/MOFs composite leather finishing agent. Wherein the mass of the deionized water is 50% of that of the polyacrylate emulsion, the solid content of the polyacrylate emulsion is 33%, and the dosage of the MOFs material is 1% of that of the polyacrylate emulsion.
Example 5
(1) Preparation of MOFs materials
1.5 g of ZrCl4And 1.7 g of terephthalic acid are respectively dissolved in 20mL of N, N-Dimethylformamide (DMF), then the two solutions are mixed and transferred into a reaction kettle, hydrothermal reaction is carried out for 25h at 130 ℃, then the filtration membrane is used for filtration, the product is placed in 20mL of DMF, stirring is carried out for 20h at room temperature, then filtration is carried out again by using the filtration membrane, further the product is placed in 100mL of methanol, stirring is carried out for 24h at room temperature, then filtration is carried out again by using the filtration membrane, and then the product is dried in the air, thus obtaining the MOFs material.
(2) Preparation of polyacrylate/MOFs composite leather finishing agent
Ultrasonically dispersing MOFs material in deionized water for 10 min to obtain suspension of the MOFs material, then adding the suspension into polyacrylate emulsion, and stirring at the temperature of 85 ℃ at the speed of 300 r/min for 7 h to blend the suspension, thereby obtaining the polyacrylate/MOFs composite leather finishing agent. Wherein the mass of the deionized water is 50% of that of the polyacrylate emulsion, the solid content of the polyacrylate emulsion is 33%, and the dosage of the MOFs material is 1.5% of that of the polyacrylate emulsion.
Example 6
(1) Preparation of MOFs materials
Mixing 0.2g of zinc acetate and 0.4 g of 5-amino isophthalic acid, dissolving in 20mL of deionized water, adding acetic acid to adjust the pH value to 4.2, magnetically stirring for 20 min, transferring the solution to a reaction kettle, carrying out hydrothermal reaction at 180 ℃ for 6d, centrifuging and washing the product for several times, and drying in the air to obtain the MOFs material.
(2) Preparation of polyacrylate/MOFs composite leather finishing agent
Ultrasonically dispersing MOFs material in deionized water for 20 min to obtain a suspension of the MOFs material, then adding the suspension into a polyacrylate emulsion, and stirring at the temperature of 80 ℃ at the speed of 300 r/min for 8h to blend the suspension, thereby obtaining the polyacrylate/MOFs composite leather finishing agent. Wherein the mass of the deionized water is 50% of that of the polyacrylate emulsion, the solid content of the polyacrylate emulsion is 33%, and the MOFs material is 3% of that of the polyacrylate emulsion.
In order to test the performance of the leather sample after the polyacrylate/MOFs composite emulsion prepared by the invention is coated, the inventor adopts SEM to characterize the MOFs material, tests the mechanical property, the water resistance and the water vapor permeability of the leather sample after the polyacrylate/MOFs composite emulsion is coated, and analyzes the test results by combining the accompanying drawings as follows:
fig. 1 is an SEM photograph of the MOFs material prepared by the present invention, which shows that: ZrCl is selected4And the MOFs material prepared by taking terephthalic acid as a raw material is nanocrystalline particles with an obvious octahedral structure,the grain diameter is about 100 nm; ZrOCl is selected2‧8H2The MOFs material prepared by taking O and fumaric acid as raw materials and the MOFs material prepared by taking zinc acetate and 5-amino isophthalic acid as raw materials are respectively in a rod-like structure and a block-like structure, and the crystal size is about 1 mu m.
Table 1 shows the properties of the leather sample after finishing with the polyacrylate/MOFs composite leather finishing agent prepared according to the present invention, and it can be seen from table 1 that the tensile strength, tear strength, breaking strength, water resistance and water vapor permeability of the leather sample after finishing with the composite leather finishing agent prepared according to the present invention are respectively improved by 5.65%, 10.34%, 21.43%, 8.62% and 5.89% compared with the leather sample after finishing with pure polyacrylate.
TABLE 1 comparison of leather properties after emulsion finishing
Figure DEST_PATH_IMAGE002
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.

Claims (9)

1. The preparation method of the polyacrylate/MOFs composite leather finishing agent is characterized by comprising the following steps:
the method comprises the following steps: preparing MOFs materials:
first, ZrCl is added4And terephthalic acid are respectively dissolved in 20mL of N, N-dimethylformamide, then the two solutions are mixed and transferred into a reaction kettle for hydrothermal reaction, and a filter membrane is used for filtration after the reaction is finished; then, placing the product in 2-40 mL of N, N-dimethylformamide, stirring for 20-28 h at room temperature, and filtering again by using a filter membrane; further placing the product in 50-100 mL of methanol, stirring for 20-28 h at room temperature, filtering with a filter membrane again, and finally drying the product in air to obtain the MOFs material;
step two: preparing a polyacrylate/MOFs composite leather finishing agent.
2. The preparation method of the polyacrylate/MOFs composite leather finishing agent according to claim 1, comprising the following steps:
in the step one, ZrCl4The mass ratio of the ZrCl to the terephthalic acid is 1: 0.5-1: 2, wherein the ZrCl is4The dosage of the composition is 0.7-2 g;
the temperature of the hydrothermal reaction is 100-150 ℃, and the reaction time is 20-28 h.
3. The preparation method of the polyacrylate/MOFs composite leather finishing agent is characterized by comprising the following steps:
the method comprises the following steps: preparing MOFs materials:
first, ZrOCl is added2‧8H2Dissolving O and fumaric acid in 30 mL of N, N-dimethylformamide and 3 mL of formic acid respectively, mixing the two solutions, transferring the mixture into a reaction kettle for hydrothermal reaction, filtering the mixture by using a filter membrane after the reaction is finished, washing the product for a plurality of times by using N, N-dimethylformamide and acetone respectively, and finally drying the product in the air to obtain the MOFs material;
step two: preparing a polyacrylate/MOFs composite leather finishing agent.
4. The preparation method of the polyacrylate/MOFs composite leather finishing agent according to claim 3, wherein the preparation method comprises the following steps:
in the first step, ZrOCl2‧8H2The mass ratio of O to fumaric acid is 1: 1-1: 3, wherein ZrOCl2‧8H2The dosage of O is 0.1-0.5 g;
the temperature of the hydrothermal reaction is 80-120 ℃, and the reaction time is 20-28 h.
5. The preparation method of the polyacrylate/MOFs composite leather finishing agent is characterized by comprising the following steps:
the method comprises the following steps: preparing MOFs materials:
mixing zinc acetate and 5-amino isophthalic acid, dissolving in 20mL of deionized water, adding acetic acid to adjust the pH to 3.6-4.2, magnetically stirring for 20 min, transferring the solution to a reaction kettle, carrying out hydrothermal reaction, filtering with a filter membrane, centrifuging and washing the product, and drying in the air to obtain the MOFs material;
step two: preparing a polyacrylate/MOFs composite leather finishing agent.
6. The preparation method of the polyacrylate/MOFs composite leather finishing agent according to claim 5, wherein the preparation method comprises the following steps:
in the first step, the mass ratio of zinc acetate to 5-amino isophthalic acid is 1: 0.5-1: 2.5, wherein the amount of zinc acetate is 0.05-0.2 g;
the temperature of the hydrothermal reaction is 150-200 ℃, and the reaction time is 5-6 d.
7. The preparation method of the polyacrylate/MOFs composite leather finishing agent according to claim 1, 3 or 5,
in the second step, the preparation of the polyacrylate/MOFs composite leather finishing agent comprises the following specific steps:
firstly, ultrasonically dispersing the MOFs material prepared in the step one in deionized water to obtain a suspension of the MOFs material, then adding the suspension into a polyacrylate emulsion, stirring and blending to obtain the polyacrylate/MOFs composite leather finishing agent.
8. The preparation method of the polyacrylate/MOFs composite leather finishing agent according to claim 7, wherein the preparation method comprises the following steps:
in the second step, the time of ultrasonic dispersion is 10-20 min;
the using amount of the deionized water is 50 percent of the mass of the polyacrylate emulsion;
the solid content of the polyacrylate emulsion was 33%;
the dosage of the MOFs material is 0.25-3% of the solid content of the polyacrylate emulsion.
9. The preparation method of the polyacrylate/MOFs composite leather finishing agent according to claim 7, wherein the preparation method comprises the following steps:
in the second step, the blending temperature of the suspension of the MOFs material and the polyacrylate emulsion is 75-85 ℃, the stirring speed is 300 r/min, and the blending time is 4-8 h.
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CN112876924B (en) * 2021-02-20 2022-10-04 陕西科技大学 Breathable polyacrylate/Ti-MOF composite leather finishing agent and preparation method thereof
CN115477768A (en) * 2021-06-16 2022-12-16 江苏集萃智能液晶科技有限公司 Dimming material composition and dimming device
CN113480905B (en) * 2021-08-04 2022-03-25 陕西科技大学 Leather coating with fluorescent response to benzene-series VOCs and preparation method thereof
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