CN114410095A - Sheet molding compound for adsorbing and degrading formaldehyde and preparation method thereof - Google Patents

Sheet molding compound for adsorbing and degrading formaldehyde and preparation method thereof Download PDF

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CN114410095A
CN114410095A CN202111665205.8A CN202111665205A CN114410095A CN 114410095 A CN114410095 A CN 114410095A CN 202111665205 A CN202111665205 A CN 202111665205A CN 114410095 A CN114410095 A CN 114410095A
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sheet molding
molding compound
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adsorbing
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CN114410095B (en
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田鹏
李军
陆满山
秦成强
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Jiangsu Chinyo Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/06—Unsaturated polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/06—Unsaturated polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate

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  • Reinforced Plastic Materials (AREA)

Abstract

The invention provides a sheet molding compound for adsorbing and degrading formaldehyde and a preparation method thereof, wherein the method comprises the following steps: mixing and stirring 60-70 parts by weight of unsaturated polyester resin and 30-40 parts by weight of low-shrinkage additive; then adding 10-50 parts by weight of attapulgite loaded nano titanium dioxide powder while stirring, adding 30-80 parts by weight of calcium carbonate powder, continuously stirring, adding a curing agent, stirring the solution to 38-42 ℃, and stopping stirring to obtain resin paste; adding 3-8 parts by weight of a thickening agent into the resin paste, and soaking 50-120 parts by weight of glass fibers into the resin paste to prepare SMC sheet molding compound; curing the SMC sheet molding compound; pressing and molding the cured SMC sheet molding compound; and soaking the formed SMC sheet molding compound in dilute hydrochloric acid with the concentration of 5-8% for 15-30 min. The sheet molding compound for adsorbing and degrading formaldehyde has excellent performance and has the function of adsorbing and degrading formaldehyde.

Description

Sheet molding compound for adsorbing and degrading formaldehyde and preparation method thereof
Technical Field
The invention relates to the technical field of sheet molding compounds, in particular to a sheet molding compound for adsorbing and degrading formaldehyde and a preparation method thereof.
Background
Sheet molding compounds (abbreviated as SMC) are Sheet molding compounds prepared by coating polyhexene films on two sides of resin paste impregnated fibers or chopped strand mats, have the characteristics of high strength, good toughness, high surface flatness, good glossiness, simple forming and processing, strong designability and the like, and are increasingly widely applied to home and automobile interior parts. However, the conventional sheet molding compound itself volatilizes a small amount of formaldehyde, and is not environmentally friendly.
Disclosure of Invention
The invention aims to provide a sheet molding compound which has excellent performance and can adsorb and degrade formaldehyde and adsorb and degrade formaldehyde, and a preparation method of the sheet molding compound.
In order to solve the technical problems, the invention provides a technical scheme that: a preparation method of sheet molding compound for adsorbing and degrading formaldehyde comprises the following steps:
A. mixing and stirring 60-70 parts by weight of unsaturated polyester resin and 30-40 parts by weight of low-shrinkage additive;
B. then 1050 parts by weight of attapulgite loaded nano titanium dioxide powder is added while stirring, and 30-80 parts by weight of calcium carbonate powder is added and continuously stirred;
C. adding a curing agent, stirring the solution to 38-42 ℃, and stopping stirring to obtain resin paste;
D. adding 3-8 parts by weight of a thickening agent into the resin paste, and soaking 50-120 parts by weight of glass fibers into the resin paste to prepare SMC sheet molding compound;
E. curing the SMC sheet molding compound;
F. pressing and molding the cured SMC sheet molding compound;
G. and soaking the formed SMC sheet molding compound in dilute hydrochloric acid with the concentration of 5-8% for 15-30 min.
The unsaturated polyester resin is preferably 60 parts, 63 parts, 65 parts, 68 parts or 70 parts by weight. The parts by weight of the low profile additive are preferably 30, 32, 35, 38 or 40 parts. The calcium carbonate is preferably present in an amount of 30 parts, 40 parts, 50 parts, 60 parts, 70 parts or 80 parts by weight. The thickener is preferably present in 3 parts, 5 parts or 8 parts by weight. The glass fiber is preferably 50 parts, 60 parts, 80 parts, 90 parts, 110 parts, 120 parts, or the like by weight. The curing agent is preferably 1 part, 1.5 parts, 2 parts or 3 parts by weight.
The attapulgite-supported nano titanium dioxide powder is preferably 10 parts, 20 parts, 30 parts, 40 parts, or the like by weight. When the addition amount is more than 50 parts, the viscosity of the system is far more than 20000mpa · s, and the infiltration requirement of the SMC glass fiber can not be met.
The preparation method of the attapulgite loaded nano titanium dioxide comprises the steps of calcining attapulgite at high temperature, adding the calcined attapulgite into ethanol water solution, and adding NaSO4(ii) a Then TiCl is added dropwise simultaneously4And NaOH solution, controlling the pH value of the system to be 7-8, heating in a water bath to 80-90 ℃ after dropwise adding, filtering, washing with water, centrifuging and drying after reaction to obtain powder; and calcining the powder at high temperature, cooling to room temperature, and grinding to obtain the attapulgite loaded nano titanium dioxide powder.
The high-temperature calcination temperature of the attapulgite is 450-550 ℃, the high-temperature calcination time of the attapulgite is 2-3 hours, the high-temperature calcination temperature of the powder is 380-450 ℃, the high-temperature calcination time of the powder is 2-3 hours, the concentration of ethanol in an ethanol water solution is 20%, and the attapulgite and NaSO are mixed in a reactor4The mass ratio of the NaOH solution to the water bath is 3: 1-5: 1, the concentration of the NaOH solution is 5%, the water bath heating and stirring time is 2-3 hours, and the high-temperature calcination of the powder is carried out at the speed of 5-10 ℃/min.
The particle size of the calcium carbonate powder is 1-2 μm.
Step A, adding 0.01-0.1 part by weight of polymerization inhibitor, 4-8 parts by weight of diluent, 2-4 parts by weight of viscosity reducer and 2-4 parts by weight of dispersant; and C, adding 4-6 parts by weight of internal release agent after adding the calcium carbonate powder in the step B. The weight part of the diluent is preferably 4 parts, 6 parts or 8 parts. The weight part of the viscosity reducer is preferably 2 parts, 3 parts or 4 parts. The weight part of the dispersant is preferably 2 parts, 3 parts or 4 parts. The internal mold release agent is preferably 4 parts, 5 parts or 6 parts by weight. The polymerization inhibitor is preferably 0.01 part, 0.05 part, 0.08 part or 0.1 part by weight.
The low-shrinkage additive is polystyrene, polyvinyl acetate or saturated polyester resin, the dispersing agent is BYK-W972, the internal mold release agent is zinc stearate, the diluent is an unsaturated resin diluent SM, the viscosity reducer is BYK-W9010, the polymerization inhibitor is 2, 6-di-tert-butyl-p-cresol, the curing agent is tert-butyl peroxybenzoate, and the thickening agent is magnesium oxide.
Drying the attapulgite loaded nano titanium dioxide in the step B for 1h at 105 ℃ before adding; in the step E, the SMC sheet molding compound is sealed by an aluminum foil and cured for 40-50 h at the temperature of 38-55 ℃; f, pressing and molding the SMC sheet molding compound aged in the step F in a mold at the temperature of 120-140 ℃ under the pressure of 1000T/m2And keeping the pressure for 3min, and pressing into a 3mm flat plate.
And D, continuously producing SMC sheet molding compound by adopting an SMC forming unit, wherein the vehicle speed is 8m/min before the SMC forming unit, the flow rate of the resin paste base liquid reaches 20.86kg/min, the flow rate of the thickening agent reaches 0.42kg/min, and the rotating speed of the glass fiber shredding roller is 66 rpm.
The stirring speed in the step A, B, C is 800-1200 r/min, and the stirring time is 3-5 min.
In order to solve the technical problems, the invention provides another technical scheme that: the sheet molding compound for adsorbing and degrading formaldehyde is prepared by the preparation method.
The invention has the positive effects that:
the preparation method of the sheet molding compound for adsorbing and degrading formaldehyde comprises the steps of adding attapulgite compounded by a special process into resin paste to load nano titanium dioxide, wherein the attapulgite has a pore structure, and pores are filled and covered by calcium carbonate powder with the particle size of 1-2 mu m added later, and most preferablyThen washing with dilute hydrochloric acid to remove calcium carbonate on the surface and restore the microporous structure of the attapulgite, thereby increasing TiO2The contact area with formaldehyde. The sheet molding compound for adsorbing and degrading formaldehyde not only has the excellent performance of the traditional sheet molding compound, but also has the advantages that the added attapulgite loads the nano titanium dioxide catalyst, the attapulgite continuously adsorbs formaldehyde, and the nano TiO2The formaldehyde is catalytically degraded under the ultraviolet light, so that the formaldehyde content is continuously reduced, more formaldehyde can be adsorbed and degraded, and the method is safe and environment-friendly.
Drawings
FIG. 1 is a graph showing the effect of different concentrations of acid washing and different acid washing times on formaldehyde adsorption degradation of a sheet molding compound adsorbing and degrading formaldehyde in example 1 of the present invention;
FIG. 2 is a graph of tensile elongation of a conventional SMC;
FIG. 3 is a graph of the bending curve of a conventional SMC;
FIG. 4 is a drawing graph of the sheet molding compound adsorbing degraded formaldehyde of example 1 of the present invention after being acid-washed with 8% hydrochloric acid for 15 min;
FIG. 5 is a bending curve of the sheet molding compound adsorbing degraded formaldehyde of example 1 after being acid-washed with 8% hydrochloric acid for 15 min;
FIG. 6 is a drawing graph of the sheet molding compound adsorbing degraded formaldehyde of example 1 after being acid-washed with 8% hydrochloric acid for 15 min;
FIG. 7 is a graph showing the bending curve of the sheet molding compound adsorbing and degrading formaldehyde of example 1 after being pickled with 8% hydrochloric acid for 15 min;
FIG. 8 is a graph comparing the effect of adsorbing degraded formaldehyde of sheet molding compounds of different compositions;
FIG. 9 is a graph showing the relationship between the amount of the attapulgite-supported nano titanium dioxide powder added and the viscosity of the resin;
fig. 10 is a graph of SGS test results.
Detailed Description
Example 1
The preparation method of the sheet molding compound for adsorbing and degrading formaldehyde comprises the following steps:
A. accurately weighing 60 parts of unsaturated polyester resin, 30 parts of low-shrinkage additive, 0.01 part of polymerization inhibitor, 4 parts of diluent, 2 parts of viscosity reducer and 2 parts of dispersing agent, sequentially pouring into a stirring kettle, and stirring at the stirring speed of 800r/min for 5 min.
B. And (2) drying 40 parts of attapulgite-loaded nano titanium dioxide powder at 105 ℃ for 1h, stirring and adding into the solution obtained in the step (A), then sequentially adding 50 parts of calcium carbonate powder with the particle size of 1-2 mu m and 4 parts of internal release agent, and continuously stirring at the stirring speed of 800r/min for 5 min.
C. And D, adding 1 part of curing agent into the solution stirred in the step B, wherein the stirring speed is 800r/min, the stirring time is 5min, and the stirring is stopped after the temperature of the stirred solution is up to 35 ℃ to obtain the resin paste.
D. And C, testing, namely pumping the resin paste obtained in the step C and 3 parts of thickening agent into a base liquid kettle of an SMC unit, starting the SMC forming unit to perform SMC continuous production, and soaking 80 parts of glass fiber in resin to prepare an SMC sheet. Before the SMC forming unit, the vehicle speed is set to be 8m/min, the flow rate of the base liquid reaches 20.86kg/min, the flow rate of the thickening agent reaches 0.42kg/min, and the glass fiber shredding roller is set to rotate at 66 rpm.
E. D, sealing the SMC sheet obtained in the step D by using an aluminum foil, and curing for 50 hours at the temperature of 38 ℃;
F. e, pressing and molding the sheet molding compound cured in the step E in a mold with an upper mold temperature of 125 ℃ and a lower mold temperature of 120 ℃ at a pressure of 1000T/m2And keeping the pressure for 3min, and pressing into a 3mm flat plate.
G. And F, soaking the flat plate pressed in the step F in dilute hydrochloric acid with the concentration of 5% for 30 min.
The low-shrinkage additive is polystyrene, the internal mold release agent is zinc stearate, the diluent is an unsaturated resin diluent SM, the viscosity reducer is BYK-W9010, the polymerization inhibitor is 2, 6-di-tert-butyl-p-cresol, the curing agent is tert-butyl peroxybenzoate, and the thickening agent is magnesium oxide.
Example 2
The preparation method of the sheet molding compound for adsorbing and degrading formaldehyde comprises the following steps:
A. and (2) accurately weighing 65 parts of unsaturated polyester resin, 35 parts of low-shrinkage additive, 0.05 part of polymerization inhibitor, 6 parts of diluent, 3 parts of viscosity reducer and 3 parts of dispersing agent, sequentially pouring into a stirring kettle, and stirring at the stirring speed of 1000r/min for 4 min.
B. And (2) drying 30 parts of attapulgite-loaded nano titanium dioxide powder at 105 ℃ for 1h, stirring and adding into the solution obtained in the step (A), then sequentially adding 40 parts of calcium carbonate powder with the particle size of 1-2 mu m and 3 parts of internal release agent, and continuously stirring at the stirring speed of 1000r/min for 4 min.
C. And C, adding 2 parts of curing agent into the solution stirred in the step B, stirring at the rotating speed of 1000r/min for 4min, and stopping stirring after the temperature of the stirred solution is up to 40 ℃ to obtain the resin paste.
D. And C, testing, namely pumping the resin paste obtained in the step C and 5 parts of thickening agent into a base liquid kettle of an SMC unit, starting the SMC forming unit to perform SMC continuous production, and soaking 60 parts of glass fiber in resin to prepare an SMC sheet. Before the SMC forming unit, the vehicle speed is set to be 8m/min, the flow rate of the base liquid reaches 20.86kg/min, the flow rate of the thickening agent reaches 0.42kg/min, and the glass fiber shredding roller is set to rotate at 66 rpm.
E. D, sealing the SMC sheet obtained in the step D by using an aluminum foil, and curing for 48 hours at the temperature of 50 ℃;
F. e, pressing and molding the cured sheet molding compound in the step E in a mold with an upper mold at 130 ℃ and a lower mold at 125 ℃ under the pressure of 1000T/m2And keeping the pressure for 3min, and pressing into a 3mm flat plate.
G. And F, soaking the flat plate pressed in the step F in 6% diluted hydrochloric acid for 20 min.
The low-shrinkage additive is polyvinyl acetate, the internal mold release agent is zinc stearate, the diluent is unsaturated resin diluent SM, the viscosity reducer is BYK-W9010, the polymerization inhibitor is 2, 6-di-tert-butyl-p-cresol, the curing agent is tert-butyl peroxybenzoate, and the thickening agent is magnesium oxide.
Example 3
The preparation method of the sheet molding compound for adsorbing and degrading formaldehyde comprises the following steps:
A. accurately weighing 70 parts of unsaturated polyester resin, 40 parts of low-shrinkage additive, 0.1 part of polymerization inhibitor, 8 parts of diluent, 4 parts of viscosity reducer and 4 parts of dispersing agent, sequentially pouring into a stirring kettle, and stirring at the stirring speed of 1200r/min for 3 min.
B. And (2) drying 20 parts of attapulgite-loaded nano titanium dioxide powder at 105 ℃ for 1h, stirring while adding the attapulgite-loaded nano titanium dioxide powder into the solution obtained in the step (A), then sequentially adding 80 parts of calcium carbonate powder with the particle size of 1 mu m and 6 parts of internal release agent, and continuously stirring at the stirring speed of 1200r/min for 3 min.
C. And C, adding 3 parts of curing agent into the solution stirred in the step B, wherein the stirring speed is 1200r/min, the stirring time is 3min, and the stirring is stopped after the temperature of the stirred solution is 45 ℃ to obtain the resin paste.
D. And C, testing, namely pumping the resin paste obtained in the step C and 8 parts of thickening agent into a base liquid kettle of an SMC unit, starting the SMC forming unit to perform SMC continuous production, and soaking 120 parts of glass fiber in resin to prepare an SMC sheet. Before the SMC forming unit, the vehicle speed is set to be 8m/min, the flow rate of the base liquid reaches 20.86kg/min, the flow rate of the thickening agent reaches 0.42kg/min, and the glass fiber shredding roller is set to rotate at 66 rpm.
E. D, sealing the SMC sheet obtained in the step D by using an aluminum foil, and curing for 40 hours at the temperature of 55 ℃;
F. e, pressing and molding the cured sheet molding compound in the step E in a mold with an upper mold at 135 ℃ and a lower mold at 130 ℃ under the pressure of 1000T/m2And keeping the pressure for 3min, and pressing into a 3mm flat plate.
G. And F, soaking the flat plate pressed in the step F in 8% diluted hydrochloric acid for 15 min.
The low-shrinkage additive is saturated polyester resin, the internal release agent is zinc stearate, the diluent is unsaturated resin diluent SM, the viscosity reducer is BYK-W9010, the polymerization inhibitor is 2, 6-di-tert-butyl-p-cresol, the curing agent is tert-butyl peroxybenzoate, and the thickening agent is magnesium oxide.
The attapulgite loaded nano titanium dioxide powder is prepared by the following process: calcining attapulgite at 500 deg.C for 2h, adding 200g attapulgite into 400mL deionized water and 100mL ethanol mixed solution, and adding 50g NaSO4Slowly adding TiCl while stirring by using a constant-pressure titration funnel4While slowly adding 5 percent of the mixture into a constant pressure titration funnelAnd (3) controlling the pH value of the system to be 7-8, heating the water bath to 80 ℃ after the dropwise addition is finished, continuously stirring for 2 hours, filtering the mixture by using a sand core funnel, washing the mixture by using water, centrifuging the mixture, drying the mixture at 80 ℃ to obtain powder, heating the powder to 400 ℃ in a muffle furnace at a speed of 5 ℃/min, calcining the powder for 2 hours, cooling the powder to room temperature, and grinding the powder to obtain the attapulgite loaded nano titanium dioxide powder.
As shown in FIG. 9, when the addition amount of the attapulgite-loaded nano titanium dioxide powder is more than 50 parts, the viscosity of the system is much higher than 20000mpa · s, and the infiltration requirement of the SMC glass fiber cannot be met, so that the addition amount of the attapulgite-loaded nano titanium dioxide powder must be controlled to be not more than 50 parts.
The unsaturated polyester resin used in the invention adopts conventional unsaturated polyester resin and is produced by enterprises.
The formaldehyde adsorption and degradation effects of different concentrations of acid washing and different acid washing times are verified:
as shown in figure 1, the attapulgite loaded nano titanium dioxide SMC sheet molding compound which is not subjected to acid pickling has a slower formaldehyde adsorption effect, the adsorption effect is obviously accelerated after the SMC is subjected to hydrochloric acid pickling for 15min at the concentration of 8%, and the effect is not obviously different from that of the SMC after the SMC is subjected to hydrochloric acid pickling for 30min at the concentration of 5% and 60min, and is slightly worse than that of the SMC at the concentration of 8%.
As shown in table 1 and fig. 2 to 7, the tensile and flexural strength test results show that 8% hydrochloric acid has a significant effect on the strength, and 5% pickling for 30min has no significant effect on the mechanical strength, so the optimal process condition for the final acid treatment is 5% pickling for 30 min.
Table 1 tensile and flexural strength test data sheet
Conventional SMC Pickling with 8% hydrochloric acid for 15min Pickling with 5% hydrochloric acid for 30min
Tensile strength/MPa 102.3 80.5 109.9
Flexural Strength/MPa 205.4 172.0 219
Verifying the adsorption degradation effect:
as shown in fig. 8, the conventional SMC has a gradually increasing formaldehyde content with the passage of time because it contains a small amount of formaldehyde by itself; the attapulgite gradually reduces the initial concentration due to the adsorption effect, and then the formaldehyde content of the SMC is gradually released due to the adsorption saturation, so that the formaldehyde content is slightly increased; pure TiO2The concentration of formaldehyde is gradually reduced due to the certain catalytic decomposition capability of the formaldehyde; the attapulgite is loaded with the nano titanium dioxide composite catalyst, the attapulgite continuously adsorbs formaldehyde, and the nano TiO2And (3) catalyzing and degrading formaldehyde under ultraviolet light to continuously reduce the formaldehyde content.
The formaldehyde content was tested as follows:
the SMC sample plate with 200X 3mm and a formaldehyde tester are placed in a 10L transparent test bag together for sealing, and the formaldehyde tester is irradiated by an ultraviolet lamp with the power of 30W and the wavelength of 365nm, and the formaldehyde concentration of the formaldehyde tester is read at regular time.
In order to confirm the test accuracy of the formaldehyde tester, according to the same test method and comparison with SGS of a third-party testing organization, the test conditions are as follows, 100mm 4mm SMC sample plate is placed in a 10L sampling bag to be sealed, the formaldehyde content in the system is tested after being dried for 2h at 65 ℃, and the formaldehyde used by people isThe test result of the tester is 0.85mg/m3SGS test result is 6.82. mu.g/10L, converted to 0.68mg/m3And the deviation of the test result is small, so that the accuracy of the formaldehyde tester is not problematic. The SGS test results are shown in fig. 10.

Claims (10)

1. The preparation method of the sheet molding compound for adsorbing and degrading formaldehyde is characterized by comprising the following steps of:
A. mixing and stirring 60-70 parts by weight of unsaturated polyester resin and 30-40 parts by weight of low-shrinkage additive;
B. then adding 10-50 parts by weight of attapulgite loaded nano titanium dioxide powder while stirring, adding 30-80 parts by weight of calcium carbonate powder, and continuously stirring;
C. adding a curing agent, stirring the solution to 38-42 ℃, and stopping stirring to obtain resin paste;
D. adding 3-8 parts by weight of a thickening agent into the resin paste, and soaking 50-120 parts by weight of glass fibers into the resin paste to prepare SMC sheet molding compound;
E. curing the SMC sheet molding compound;
F. pressing and molding the cured SMC sheet molding compound;
G. and soaking the formed SMC sheet molding compound in dilute hydrochloric acid with the concentration of 5-8% for 15-30 min.
2. The method for preparing sheet molding compound adsorbing and degrading formaldehyde as claimed in claim 1, wherein the method for preparing attapulgite loaded with nano titanium dioxide comprises the steps of calcining attapulgite at high temperature, adding into ethanol water solution, and adding NaSO4(ii) a Then TiCl is added dropwise simultaneously4And NaOH solution, controlling the pH value of the system to be 7-8, heating in a water bath to 80-90 ℃ after dropwise adding, filtering, washing with water, centrifuging and drying after reaction to obtain powder; and calcining the powder at high temperature, cooling to room temperature, and grinding to obtain the attapulgite loaded nano titanium dioxide powder.
3. Adsorption according to claim 2The preparation method of the sheet molding compound for degrading formaldehyde is characterized in that the high-temperature calcination temperature of attapulgite is 450-550 ℃, the high-temperature calcination time of the attapulgite is 2-3 hours, the high-temperature calcination temperature of powder is 380-450 ℃, the high-temperature calcination time of the powder is 2-3 hours, the concentration of ethanol in an ethanol water solution is 20%, and the attapulgite and NaSO are mixed with each other4The mass ratio of the NaOH solution to the water bath is 3: 1-5: 1, the concentration of the NaOH solution is 5%, the water bath heating and stirring time is 2-3 hours, and the high-temperature calcination of the powder is carried out at the speed of 5-10 ℃/min.
4. The method for preparing a sheet molding compound capable of adsorbing and degrading formaldehyde according to claim 1, wherein the particle size of the calcium carbonate powder is 1-2 μm.
5. The method for preparing a sheet molding compound capable of adsorbing and degrading formaldehyde according to any one of claims 1 to 4, wherein 0.01 to 0.1 part by weight of a polymerization inhibitor, 4 to 8 parts by weight of a diluent, 2 to 4 parts by weight of a viscosity reducer, and 2 to 4 parts by weight of a dispersant are further added in the step A; and C, adding 4-6 parts by weight of internal release agent after adding the calcium carbonate powder in the step B.
6. The method for preparing a sheet molding compound capable of adsorbing and degrading formaldehyde according to claim 5, wherein the low shrinkage additive is polystyrene, polyvinyl acetate or saturated polyester resin, the dispersant is BYK-W972, the internal mold release agent is zinc stearate, the diluent is an unsaturated resin diluent SM, the viscosity reducer is BYK-W9010, the polymerization inhibitor is 2, 6-di-tert-butyl-p-cresol, the curing agent is tert-butyl peroxybenzoate, and the thickening agent is magnesium oxide.
7. The method for preparing a sheet molding compound adsorbing degraded formaldehyde as claimed in any one of claims 1 to 4, wherein the attapulgite loaded nano titanium dioxide in step B is dried at 105 ℃ for 1h before being added; in the step E, the SMC sheet molding compound is sealed by an aluminum foil and cured for 40-50 h at the temperature of 38-55 ℃; f curing the SMC sheet molding compoundPressing and molding in a mold at 120-140 ℃ under the pressure of 1000T/m2And keeping the pressure for 3min, and pressing into a 3mm flat plate.
8. The method for preparing a sheet molding compound adsorbing and degrading formaldehyde according to any one of claims 1 to 4, wherein the SMC sheet molding compound is continuously produced in step D by using an SMC forming unit, the vehicle speed before the SMC forming unit is 8m/min, the resin paste base liquid flow rate is 20.86kg/min, the thickener flow rate is 0.42kg/min, and the glass fiber shredding roller speed is 66 rpm.
9. The method for preparing a sheet molding compound capable of adsorbing and degrading formaldehyde according to any one of claims 1 to 4, wherein the stirring speed in the step A, B, C is 800-1200 r/min, and the stirring time is 3-5 min.
10. A sheet molding compound adsorbing degraded formaldehyde prepared by the method of claim 1.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101058666A (en) * 2007-05-29 2007-10-24 羊建军 Unsaturated polyester sheet moulding material and preparation method thereof
CN102604351A (en) * 2012-03-05 2012-07-25 常州天马集团有限公司 Platy mold plastic for door sheet and preparing method of platy mold plastic
CN112108137A (en) * 2020-10-19 2020-12-22 中国科学院兰州化学物理研究所 Method for uniformly preparing attapulgite-titanium dioxide composite material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101058666A (en) * 2007-05-29 2007-10-24 羊建军 Unsaturated polyester sheet moulding material and preparation method thereof
CN102604351A (en) * 2012-03-05 2012-07-25 常州天马集团有限公司 Platy mold plastic for door sheet and preparing method of platy mold plastic
CN112108137A (en) * 2020-10-19 2020-12-22 中国科学院兰州化学物理研究所 Method for uniformly preparing attapulgite-titanium dioxide composite material

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