CN111253779B - Particle foam stabilizer and preparation method and application thereof - Google Patents

Particle foam stabilizer and preparation method and application thereof Download PDF

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CN111253779B
CN111253779B CN202010059134.6A CN202010059134A CN111253779B CN 111253779 B CN111253779 B CN 111253779B CN 202010059134 A CN202010059134 A CN 202010059134A CN 111253779 B CN111253779 B CN 111253779B
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foam stabilizer
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solid particles
particle foam
preparation
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CN111253779A (en
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杨继生
唐烨
王旭鹏
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Yangzhou University
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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
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/02—Compounds of alkaline earth metals or magnesium
    • C09C1/021—Calcium carbonates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • C09C1/3063—Treatment with low-molecular organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • C09C1/3072—Treatment with macro-molecular organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/36—Compounds of titanium
    • C09C1/3607—Titanium dioxide
    • C09C1/3669—Treatment with low-molecular organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/40—Compounds of aluminium
    • C09C1/42—Clays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/08—Treatment with low-molecular-weight non-polymer organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/10—Treatment with macromolecular organic compounds
    • 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds

Abstract

The invention discloses a particle foam stabilizer, and a preparation method and application thereof. The particle foam stabilizer comprises hydrophilic solid particles with the particle size of 0.1-5 mu m, and hydrophobic molecular chains are modified on the surfaces of the hydrophilic solid particles through physical adsorption. The preparation method comprises the following steps: adding hydrophilic solid particles into an ethanol-water solution to prepare a solid particle suspension; then adding a modifier containing a hydrophobic molecular chain, and stirring to modify the hydrophobic molecular chain to the surface of the hydrophilic solid particles; and finally, carrying out suction filtration and separation on the obtained product, and drying the solid-phase material to obtain the particle foam stabilizer. The particle foam stabilizer can effectively improve the foam stability, and has the advantages of good stability, convenient preparation, no pungent smell and environmental protection; the particle foam stabilizer is used in a polyurethane foaming coating, and can replace the traditional ammonium stearate foam stabilizer on one hand, and on the other hand, solid particles can also serve as a filler or a functional auxiliary agent of the polyurethane foaming coating, so that the performance of the coating is improved, and meanwhile, the production cost is reduced.

Description

Particle foam stabilizer and preparation method and application thereof
Technical Field
The invention relates to a foam stabilizer and application thereof, in particular to a particle foam stabilizer, a preparation method thereof and application thereof as a foam stabilizer for a polyurethane foaming coating, and belongs to the technical field of chemical additives.
Background
The waterborne polyurethane coating is harmless to human bodies in the production process, and is widely used for preparing foaming coatings such as synthetic leather, advertising cloth and the like. And the stability of the ammonium stearate emulsion is poor, and agglomeration and thickening phenomena can occur after the ammonium stearate emulsion is placed for a long time, so that the ammonium stearate emulsion is not beneficial to use. In addition, the heat resistance of ammonium stearate is poor, stearic acid is easily decomposed in the drying process of the foaming coating, and the product quality is influenced.
Solid particles are often added in the preparation process of the polyurethane coating to improve the mechanical degree, the light shading rate and other properties of the coating.
Based on this, the inventors have formed the present technology.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems of the foam stabilizer used for the existing polyurethane foaming coating, the invention provides a particle foam stabilizer and a preparation method thereof, and also provides an application of the particle foam stabilizer as the foam stabilizer for the polyurethane foaming coating.
The technical scheme is as follows: the particle foam stabilizer comprises hydrophilic solid particles with the particle size of 0.1-5 mu m, and hydrophobic molecular chains are modified on the surfaces of the hydrophilic solid particles through physical adsorption.
The hydrophilic solid particles may be at least one of titanium dioxide, calcium carbonate, silica, kaolin, bentonite, and the like.
The hydrophobic molecular chain can be provided by a modifier containing the hydrophobic molecular chain, preferably, the modifier containing the hydrophobic molecular chain is adsorbed on the surface of the hydrophilic solid particle, and the amount of the modifier containing the hydrophobic molecular chain can be 5-20% of the mass of the hydrophilic solid particle. The modifier containing the hydrophobic molecular chain can be at least one of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium hexadecyl sulfate, sodium octadecyl sulfate, sodium fatty alcohol-polyoxyethylene ether sulfate, sodium fatty acid methyl ester sulfonate, sorbitan monostearate, sorbitan monooleate, sorbitan monopalmitate, sorbitan monolaurate, fatty alcohol-polyoxyethylene ether, dimethyl polysiloxane polyether, alkyl glycoside, hexadecyl trimethyl ammonium bromide and dodecyl trimethyl ammonium bromide.
The preparation method of the particle foam stabilizer comprises the following steps:
(1) adding hydrophilic solid particles into an ethanol-water solution to prepare a solid particle suspension;
(2) adding a modifying agent containing hydrophobic molecular chains into the solid particle suspension, and stirring to modify the hydrophobic molecular chains to the surfaces of the hydrophilic solid particles;
(3) and (3) carrying out suction filtration and separation on the product obtained in the step (2), and drying the solid-phase material to obtain the particle foam stabilizer.
In the step (1), the concentration of the ethanol-water solution is preferably 10-50%.
Preferably, in the step (2), the stirring temperature is 5-60 ℃, and the stirring time is 2-8 hours.
In the step (3), the drying temperature is preferably 40-60 ℃.
The application of the particle foam stabilizer is to use the particle foam stabilizer as a foam stabilizer of a polyurethane foaming coating. The mass ratio of the particle foam stabilizer to the polyurethane emulsion is preferably 6-10: 100 by taking the amount of the polyurethane emulsion in the polyurethane foam coating as a standard.
The invention principle is as follows: the particle foam stabilizer is amphiphilic particles, fine particles with amphipathy are adsorbed on a gas-liquid phase interface in the process of generating foam to form a layer of compact particle film, and coalescence and disproportionation among bubbles are prevented, so that the foam stability is greatly improved.
Has the advantages that: compared with the prior art, the invention has the advantages that: (1) the particle foam stabilizer can effectively improve the foam stability, has good stability, and effectively solves the problem that white solids are separated out on the surface of the soap foam stabilizer after the soap foam stabilizer is dried at high temperature; in addition, the solid particle foam stabilizer is convenient to prepare, has no pungent smell, and is more green and environment-friendly; (2) the particle foam stabilizer provided by the invention is used in a polyurethane foaming coating, on one hand, the particle foam stabilizer can replace the traditional ammonium stearate foam stabilizer, and on the other hand, the solid particles can also serve as the filler or functional auxiliary agent of the polyurethane foaming coating, so that the external addition of the filler and the functional auxiliary agent is effectively reduced, the mechanical strength of the coating is improved, and meanwhile, the production cost is greatly reduced.
Detailed Description
The technical solution of the present invention is further explained below.
The particle foam stabilizer comprises hydrophilic solid particles, hydrophobic molecular chains are modified on the surfaces of the hydrophilic solid particles through physical adsorption, and the particle size of the hydrophilic solid particles is 0.1-5 mu m. The particle foam stabilizer can be used as a foam stabilizer of a polyurethane foaming coating, and can also be used as a filler or a functional auxiliary agent of the polyurethane foaming coating while being used as the foam stabilizer. The foam stabilizer overcomes the defects of the existing ammonium stearate foam stabilizer, and the common solid particles in the polyurethane foaming coating are modified to have amphipathy, fine particles with amphipathy are adsorbed on a gas-liquid phase interface in the process of generating foam to form a layer of compact particle film, so that the foam stability is improved.
Example 1
The particle foam stabilizer comprises the following raw materials in percentage by mass: 30 parts of calcium carbonate (with the particle size of 5 microns), 1.5 parts of sodium dodecyl sulfate and 200 parts of 10% ethanol-water solution.
The preparation steps of the particle foam stabilizer are as follows:
1) weighing 30 parts of calcium carbonate particles into a reaction kettle, adding 200 parts of 10% ethanol-water solution, controlling the temperature to be 40 ℃, and uniformly stirring to prepare suspension;
2) then adding 1.5 parts of sodium dodecyl sulfate into the calcium carbonate suspension, and continuously stirring for 2 hours at the temperature of 40 ℃;
3) stopping stirring, carrying out suction filtration and separation on the product, and drying at 40 ℃ to obtain the calcium carbonate particle foam stabilizer.
Example 2
The particle foam stabilizer comprises the following raw materials in percentage by mass: 30 parts of calcium carbonate (with the particle size of 1 micron), 3 parts of sodium dodecyl benzene sulfonate and 200 parts of 20% ethanol-water solution.
The preparation steps of the particle foam stabilizer are as follows:
1) weighing 30 parts of calcium carbonate particles into a reaction kettle, adding 200 parts of 20% ethanol-water solution, controlling the temperature to be 20 ℃, and uniformly stirring to prepare suspension;
2) adding 3 parts of sodium dodecyl benzene sulfonate into the calcium carbonate suspension, and continuously stirring for 3 hours at the temperature of 20 ℃;
3) stopping stirring, carrying out suction filtration and separation on the product, and drying at 60 ℃ to obtain the calcium carbonate particle foam stabilizer.
Example 3
The particle foam stabilizer comprises the following raw materials in percentage by mass: 30 parts of titanium dioxide (with the particle size of 0.1 micron), 1.5 parts of hexadecyl trimethyl ammonium bromide and 200 parts of 40% ethanol-water solution.
The preparation steps of the particle foam stabilizer are as follows:
1) weighing 30 parts of titanium dioxide into a reaction kettle, adding 200 parts of 40% ethanol-water solution, controlling the temperature to be 60 ℃, and uniformly stirring to prepare suspension;
2) then adding 1.5 parts of hexadecyl trimethyl ammonium bromide into the titanium dioxide suspension, and continuously stirring for 4 hours at the temperature of 60 ℃;
3) stopping stirring, carrying out suction filtration and separation on the product, and drying at 60 ℃ to obtain the titanium dioxide particle foam stabilizer.
Example 4
The particle foam stabilizer comprises the following raw materials in percentage by mass: 15 parts of silicon dioxide (with the particle size of 0.5 micron), 15 parts of bentonite (with the particle size of 3 microns), 6 parts of fatty alcohol-polyoxyethylene ether and 200 parts of 50% ethanol-water solution.
The preparation steps of the particle foam stabilizer are as follows:
1) weighing 15 parts of silicon dioxide and 15 parts of bentonite, adding 200 parts of 50% ethanol-water solution into a reaction kettle, controlling the temperature to be 5 ℃, and uniformly stirring to prepare suspension;
2) adding 6 parts of fatty alcohol-polyoxyethylene ether into the particle suspension, and continuously stirring for 8 hours at the temperature of 5 ℃;
3) stopping stirring, carrying out suction filtration and separation on the product, and drying at 50 ℃ to obtain the silicon dioxide/bentonite particle foam stabilizer.
The solid foam stabilizers prepared in examples 1 to 4 were used as foam stabilizers for polyurethane foam coatings, and the specific amounts of the solid foam stabilizers were as shown in table 1 below, and the polyurethane foam coatings were prepared according to the following steps:
s1, uniformly mixing 200g of polyurethane emulsion, 12-20 g of particle foam stabilizer and 1g of thickener (polyacrylic acid aqueous thickener);
s2, rapidly stirring by using an electric foaming machine, and controlling the foaming ratio to be 2 to prepare foaming slurry;
and S3, coating the foaming slurry on release paper by using a film scraper, and drying in a 100 ℃ oven after coating to obtain the polyurethane foaming coating.
For comparison, a polyurethane foam coating was prepared according to the above steps S1-S3, using 20g of an ammonium stearate emulsion (25% solids content) as a foam stabilizer in place of the particle foam stabilizer.
The surface pore size of the polyurethane foam coatings prepared in examples 1 to 4 was observed microscopically, and compared with the surface pore size of the polyurethane foam coating prepared from the conventional ammonium stearate emulsion, and the test results are shown in table 1.
TABLE 1 average pore size and pore distribution of polyurethane foam coatings of different blowing agents
Figure BDA0002373841780000041
As can be seen from table 1, the particle foam stabilizers prepared according to examples 1, 2, 3 and 4 have smaller foam pore size and lower PDI value, which indicates that the pore size distribution of the foamed coating is more uniform, i.e. the foam stabilizer of the present invention has better foam stabilizing performance than the conventional ammonium stearate foam stabilizer, compared with the coating prepared by ammonium stearate emulsion.

Claims (8)

1. A preparation method of a particle foam stabilizer for a polyurethane foaming coating is characterized by comprising the following steps:
(1) adding hydrophilic solid particles into an ethanol-water solution to prepare a solid particle suspension;
(2) adding a modifying agent containing hydrophobic molecular chains into the solid particle suspension, and stirring to modify the hydrophobic molecular chains to the surfaces of the hydrophilic solid particles;
(3) carrying out suction filtration and separation on the product obtained in the step (2), and drying the solid-phase material to obtain the particle foam stabilizer; the prepared particle foam stabilizer comprises hydrophilic solid particles with the particle size of 0.1-5 mu m, and hydrophobic molecular chains are modified on the surfaces of the hydrophilic solid particles through physical adsorption.
2. The method for preparing the particle foam stabilizer for the polyurethane foam coating according to claim 1, wherein the hydrophilic solid particles are at least one of titanium dioxide, calcium carbonate, silica, kaolin and bentonite.
3. The preparation method of the particle foam stabilizer for the polyurethane foam coating according to claim 1, wherein the hydrophilic solid particles are adsorbed with a modifier containing hydrophobic molecular chains on the surface, and the amount of the modifier containing hydrophobic molecular chains is 5-20% of the mass of the hydrophilic solid particles.
4. The method according to claim 3, wherein the modifier containing hydrophobic molecular chains is at least one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, sodium hexadecyl sulfate, sodium octadecyl sulfate, sodium fatty alcohol-polyoxyethylene ether sulfate, sodium fatty acid methyl ester sulfonate, sorbitan monostearate, sorbitan monooleate, sorbitan monopalmitate, sorbitan monolaurate, fatty alcohol-polyoxyethylene ether, dimethylpolysiloxane, alkyl glycoside, hexadecyltrimethylammonium bromide, and dodecyltrimethylammonium bromide.
5. The preparation method of the particle foam stabilizer for the polyurethane foam coating according to claim 1, wherein in the step (1), the concentration of the ethanol-water solution is 10-50%.
6. The preparation method of the particle foam stabilizer for the polyurethane foam coating according to claim 1, wherein in the step (2), the stirring temperature is 5-60 ℃ and the stirring time is 2-8 h.
7. The preparation method of the particle foam stabilizer for the polyurethane foam coating according to claim 1, wherein in the step (3), the drying temperature is 40-60 ℃.
8. The polyurethane foaming coating of the particle foam stabilizer obtained by the preparation method of claim 1 is characterized by comprising a polyurethane emulsion and the particle foam stabilizer, wherein the mass ratio of the particle foam stabilizer to the polyurethane emulsion is 6-10: 100.
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CN112548096A (en) * 2020-12-14 2021-03-26 中北大学 Cobalt-coated ceramic composite powder and preparation method and application thereof
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