CN113248864A - Amino molding compound with improved performance and preparation method thereof - Google Patents
Amino molding compound with improved performance and preparation method thereof Download PDFInfo
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- CN113248864A CN113248864A CN202110551532.4A CN202110551532A CN113248864A CN 113248864 A CN113248864 A CN 113248864A CN 202110551532 A CN202110551532 A CN 202110551532A CN 113248864 A CN113248864 A CN 113248864A
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- 150000001875 compounds Chemical class 0.000 title claims abstract description 140
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 title claims abstract description 100
- 238000000465 moulding Methods 0.000 title claims abstract description 91
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 105
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000004202 carbamide Substances 0.000 claims abstract description 19
- 239000002270 dispersing agent Substances 0.000 claims abstract description 19
- 239000000945 filler Substances 0.000 claims abstract description 19
- 239000000314 lubricant Substances 0.000 claims abstract description 19
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims abstract description 19
- 239000008104 plant cellulose Substances 0.000 claims abstract description 19
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 12
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims description 157
- 238000006243 chemical reaction Methods 0.000 claims description 69
- 239000000203 mixture Substances 0.000 claims description 37
- 239000000843 powder Substances 0.000 claims description 34
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 18
- 238000005303 weighing Methods 0.000 claims description 17
- 229920000459 Nitrile rubber Polymers 0.000 claims description 16
- -1 alkyl isocyanate Chemical class 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- 229920001971 elastomer Polymers 0.000 claims description 16
- 239000003365 glass fiber Substances 0.000 claims description 16
- 239000012948 isocyanate Substances 0.000 claims description 16
- 238000006116 polymerization reaction Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 238000004898 kneading Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000000206 moulding compound Substances 0.000 claims description 9
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 claims description 9
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 8
- 239000012046 mixed solvent Substances 0.000 claims description 8
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 7
- 235000021355 Stearic acid Nutrition 0.000 claims description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 6
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 6
- 235000006408 oxalic acid Nutrition 0.000 claims description 6
- 239000008117 stearic acid Substances 0.000 claims description 6
- 239000010902 straw Substances 0.000 claims description 6
- IIACRCGMVDHOTQ-UHFFFAOYSA-M sulfamate Chemical compound NS([O-])(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-M 0.000 claims description 6
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 5
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 5
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 5
- 239000011425 bamboo Substances 0.000 claims description 5
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 claims description 5
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 claims description 4
- 239000005711 Benzoic acid Substances 0.000 claims description 4
- 244000025254 Cannabis sativa Species 0.000 claims description 4
- 235000010233 benzoic acid Nutrition 0.000 claims description 4
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 4
- 239000008116 calcium stearate Substances 0.000 claims description 4
- 235000013539 calcium stearate Nutrition 0.000 claims description 4
- 239000002023 wood Substances 0.000 claims description 4
- 235000013312 flour Nutrition 0.000 claims description 2
- 244000082204 Phyllostachys viridis Species 0.000 claims 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims 1
- 239000006082 mold release agent Substances 0.000 claims 1
- 150000004760 silicates Chemical class 0.000 claims 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 20
- 238000004132 cross linking Methods 0.000 abstract description 15
- 239000002994 raw material Substances 0.000 abstract description 12
- 230000002708 enhancing effect Effects 0.000 description 12
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 8
- 229920003023 plastic Polymers 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 5
- 230000000379 polymerizing effect Effects 0.000 description 5
- 241001330002 Bambuseae Species 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 229920003180 amino resin Polymers 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001289 polyvinyl ether Polymers 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000003678 scratch resistant effect Effects 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08L61/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C08L61/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea
-
- 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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Phenolic Resins Or Amino Resins (AREA)
Abstract
The embodiment of the invention discloses an amino molding compound with improved performance and a preparation method thereof, wherein the formula of the amino molding compound comprises the following components: 35-42 parts of urea, 41-51 parts of formaldehyde, 1-3 parts of melamine, 0.2-0.8 part of lubricant, 0.2-0.6 part of dispersant, 0.1-0.3 part of release agent, 1.2-1.8 parts of curing agent, 3-5 parts of filler, 10-15 parts of plant cellulose and 1-5 parts of compound low-shrinkage agent. In particular to a compound low shrinking agent which is applied to the performance improvement of amino molding compound and improves the anti-shrinking effect. Specifically, by adding the compound low shrinkage agent into the raw materials of the amino molding compound, the cross-linking effect of the raw materials of the amino molding compound and the components in the compound low shrinkage agent can be realized, the mechanical toughness can be improved, the shrinkage can be reduced, the stability of a large electrical appliance panel is ensured, and the problems of collapse, warping and the like are effectively prevented. The formula of the invention is reasonable in arrangement, the mechanical toughness is improved, the contractibility is reduced, and the practicability is stronger.
Description
Technical Field
The embodiment of the invention relates to the technical field of plastic materials, in particular to an amino molding compound with improved performance and a preparation method thereof.
Background
Aminoplast refers to thermosetting resins formed by the reaction of compounds containing amino or amido groups with formaldehyde. The amino resins which are used more in industry are: urea-formaldehyde resins (urea-formaldehyde resins), melamine resins (melamine-formaldehyde resins). The amino resin is non-toxic, odorless, hard, scratch-resistant, colorless and translucent, can be made into various plastic products with bright colors, and can be widely applied to the fields of aviation, electric appliances and the like.
In the prior art, the mold shrinkage and the post shrinkage of the amino molding compound are generally 0.6-1.0%, and the problems of central invagination or bulging, edge warping and the like often occur in the production of large electrical appliance panels and the like, so that the appearance attractiveness is influenced, and the use effect is possibly influenced. Therefore, it is an important technical improvement to reduce the shrinkage of amino molding compounds and to improve the stability after molding.
Therefore, the application provides an improved amino molding compound formula and a production method, the shrinkage rate can be obviously reduced, and the application effect is good.
Disclosure of Invention
Therefore, the embodiment of the invention provides an amino molding compound with improved performance and a preparation method thereof, so as to solve the related technical problems in the prior art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
according to a first aspect of the embodiments of the present invention, there is provided an amino molding compound with improved performance, comprising the following components in parts by weight:
further, the compound low-shrinkage agent comprises the following components in parts by weight:
further, the lubricant and the release agent are one or more of stearic acid, calcium stearate, zinc stearate, stearic acid amide and oleic acid amide.
Further, the curing agent is one or more of oxalic acid, phthalic acid, benzoic acid and sulfamate.
Further, the dispersing agent is one or more of alkylphenol polyvinyl ether, butyl stearate and stearic acid amide.
Further, the filler is one or more of wood powder, carbonate, sulfate and silicate.
Further, the plant cellulose is one or more of bamboo pulp, straw crushed pulp and grass crushed pulp.
According to a second aspect of embodiments of the present invention, there is also provided a method for preparing an amino molding compound with improved properties, for producing an amino molding compound with improved properties as described above, comprising the steps of:
(1) preparation of compound low-shrinkage agent
Firstly, weighing alkyl isocyanate, nitrile rubber powder, glass fiber, aluminum powder and superfine rubber powder according to parts by weight, adding a mixed solvent into a reaction kettle, stirring, and controlling the temperature of the solvent in the reaction kettle to be 30-35 ℃;
then, adding alkyl isocyanate and glass fiber into the reaction kettle, and continuously stirring for 20-30 min; then adding the nitrile rubber powder and the aluminum powder, and continuously stirring for 20-30 min; finally adding superfine rubber powder, and continuously stirring for 50-60 min;
finally, pouring out the prepared compound low-shrinkage agent and storing at the temperature of 20-25 ℃;
(2) preparation of amino moulding compounds
Firstly, weighing formaldehyde, urea and a curing agent according to parts by weight, adding the formaldehyde, the urea and the curing agent into a reaction kettle in a stirring state, continuously stirring for 50-60min at the stirring speed of 50-100rpm at the temperature of 20-25 ℃ in the reaction kettle to obtain a mixture I;
then, keeping the temperature and the stirring speed in the reaction kettle unchanged, adding the compound low-shrinkage agent into the first mixture in the reaction kettle according to the parts by weight, and continuously stirring for 20-30min to obtain a second mixture;
then, adding melamine, a lubricant, a dispersant, a release agent, a filler and plant cellulose in parts by weight into the second mixture, and increasing the stirring speed to 120rpm to continuously stir for 30 min;
then, increasing the stirring speed to 300rpm, stirring for 5-10min, starting a vacuum pump, and controlling the vacuum degree to be 0.08-0.2 MPa; in the kneading stage, the temperature is controlled at 45-55 ℃, and the stirring is continued for 60 min; in the temperature rise stage, the stirring speed is controlled to be 120rpm, and the stirring is continuously carried out for 80-110 min; controlling the temperature to be 70-85 ℃, entering a polymerization stage, controlling the stirring speed to be 120rpm, gradually reducing the rotation speed of a stirring paddle to 70rpm along with the temperature rise, and controlling the polymerization time to be 60-80 min;
finally, removing vacuum, and continuously cooling the reaction kettle to normal temperature to prepare the amino molding compound.
Further, the vacuum degree of the vacuum pump is controlled to be 0.1 MPa.
Further, the polymerization time was 80 min.
The embodiment of the invention has the following advantages:
the application creatively provides a compound low-shrinkage agent, which is applied to the performance improvement of amino molding plastic, and particularly improves the anti-shrinkage effect of the amino molding plastic. Specifically, by adding the compound low shrinkage agent into the raw materials of the amino molding compound, the cross-linking effect of the raw materials of the amino molding compound and the components in the compound low shrinkage agent can be realized, the mechanical toughness can be improved, the shrinkage can be reduced, the stability of a large electrical appliance panel is ensured, and the problems of collapse, warping and the like are effectively prevented. The formula of the invention is reasonable in arrangement, the mechanical toughness is improved, the contractibility is reduced, and the practicability is stronger.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to a first aspect of the embodiments of the present invention, there is provided an amino molding compound with improved performance, comprising the following components in parts by weight:
in the application, in order to reduce the shrinkage rate of the amino molding compound, a compound low shrinkage agent is provided, and the mold shrinkage rate is reduced by enhancing the crosslinking effect of the raw materials in the amino molding compound and enhancing the crosslinking effect of the amino molding compound and the compound low shrinkage agent. Specifically, the compound low-shrinkage agent comprises the following components in parts by weight:
in this application, the lubricant and the release agent are one or more selected from stearic acid, calcium stearate, zinc stearate, stearic acid amide and oleic acid amide. Further, the curing agent is one or more of oxalic acid, phthalic acid, benzoic acid and sulfamate. Further, the dispersing agent is one or more of alkylphenol polyvinyl ether, butyl stearate and stearic acid amide. Further, the filler is one or more of wood powder, carbonate, sulfate and silicate. Further, the plant cellulose is one or more of bamboo pulp, straw crushed pulp and grass crushed pulp.
According to a second aspect of embodiments of the present invention, there is also provided a method for preparing an amino molding compound with improved properties, for producing an amino molding compound with improved properties as described above, comprising the steps of:
(1) preparation of compound low-shrinkage agent
Firstly, weighing alkyl isocyanate, nitrile rubber powder, glass fiber, aluminum powder and superfine rubber powder according to parts by weight, adding a mixed solvent into a reaction kettle, stirring, and controlling the temperature of the solvent in the reaction kettle to be 30-35 ℃;
then, adding alkyl isocyanate and glass fiber into the reaction kettle, and continuously stirring for 20-30 min; then adding the nitrile rubber powder and the aluminum powder, and continuously stirring for 20-30 min; finally adding superfine rubber powder, and continuously stirring for 50-60 min;
finally, pouring out the prepared compound low-shrinkage agent and storing at the temperature of 20-25 ℃;
(2) preparation of amino moulding compounds
Firstly, weighing formaldehyde, urea and a curing agent according to parts by weight, adding the formaldehyde, the urea and the curing agent into a reaction kettle in a stirring state, continuously stirring for 50-60min at the stirring speed of 50-100rpm at the temperature of 20-25 ℃ in the reaction kettle to obtain a mixture I;
then, keeping the temperature and the stirring speed in the reaction kettle unchanged, adding the compound low-shrinkage agent into the first mixture in the reaction kettle according to the parts by weight, and continuously stirring for 20-30min to obtain a second mixture;
then, adding melamine, a lubricant, a dispersant, a release agent, a filler and plant cellulose in parts by weight into the second mixture, and increasing the stirring speed to 120rpm to continuously stir for 30 min;
then, increasing the stirring speed to 300rpm, stirring for 5-10min, starting a vacuum pump, and controlling the vacuum degree to be 0.08-0.2 MPa; in the kneading stage, the temperature is controlled at 45-55 ℃, and the stirring is continued for 60 min; in the temperature rise stage, the stirring speed is controlled to be 120rpm, and the stirring is continuously carried out for 80-110 min; controlling the temperature to be 70-85 ℃, entering a polymerization stage, controlling the stirring speed to be 120rpm, gradually reducing the rotation speed of a stirring paddle to 70rpm along with the temperature rise, and controlling the polymerization time to be 60-80 min;
finally, removing vacuum, and continuously cooling the reaction kettle to normal temperature to prepare the amino molding compound.
Based on the formulation and preparation method of the amino molding compound, in order to illustrate the effectiveness of the formulated low profile agent provided herein, the following examples are also provided:
example 1
Provides an amino molding compound with improved performance, which comprises the following components in parts by weight:
in the embodiment, in order to reduce the shrinkage rate of the amino molding compound, a compound low shrinkage agent is provided, and the mold shrinkage rate is reduced by enhancing the crosslinking effect of the raw materials in the amino molding compound and enhancing the crosslinking effect of the amino molding compound and the compound low shrinkage agent. Specifically, the compound low shrinkage agent comprises the following components in parts by weight:
in this application, the lubricant and release agent are selected from stearic acid and zinc stearate. The curing agent is oxalic acid and sulfamate. The dispersant is alkylphenol polyethenoxy ether. Furthermore, carbonate is selected as the filler. Further, the plant cellulose is selected from straw crushed pulp.
There is provided a process for the preparation of an amino molding compound of improved properties for the production of an amino molding compound of improved properties as above, comprising the steps of:
(1) preparation of compound low-shrinkage agent
Firstly, weighing alkyl isocyanate, nitrile rubber powder, glass fiber, aluminum powder and superfine rubber powder according to parts by weight, adding a mixed solvent into a reaction kettle, stirring, and controlling the temperature of the solvent in the reaction kettle to be 35 ℃.
Then, adding alkyl isocyanate and glass fiber into the reaction kettle, and continuously stirring for 30 min; then adding the nitrile rubber powder and the aluminum powder, and continuously stirring for 20 min; finally adding the superfine rubber powder and continuously stirring for 60 min.
And finally, pouring out the prepared compound low-shrinkage agent and storing at the temperature of 25 ℃.
(2) Preparation of amino moulding compounds
Firstly, weighing formaldehyde, urea and a curing agent according to parts by weight, adding the formaldehyde, the urea and the curing agent into a reaction kettle in a stirring state, and continuously stirring for 50min at the stirring speed of 100rpm at the temperature of 25 ℃ in the reaction kettle to obtain a mixture I.
And then keeping the temperature and the stirring speed in the reaction kettle unchanged, adding the compound low-shrinkage agent into the first mixture in the reaction kettle according to the parts by weight, and continuously stirring for 30min to obtain a second mixture.
And then, adding melamine, a lubricant, a dispersant, a release agent, a filler and plant cellulose in parts by weight into the second mixture, and increasing the stirring speed to 120rpm to continuously stir for 30 min.
Then, increasing the stirring speed to 300rpm, stirring for 10min, and then starting a vacuum pump to control the vacuum degree to 0.1 MPa; in the kneading stage, the temperature is controlled at 55 ℃, and the stirring is continued for 60 min; in the temperature rise stage, the stirring speed is controlled to be 120rpm, and the stirring is continued for 80 min; and when the temperature is controlled to be 70 ℃, entering a polymerization stage, controlling the stirring speed to be 120rpm, gradually reducing the rotation speed of a stirring paddle to 70rpm along with the temperature rise, and polymerizing for 80 min.
Finally, removing vacuum, and continuously cooling the reaction kettle to normal temperature to prepare the amino molding compound.
The amino molding compounds were tested for mold shrinkage and post shrinkage.
Example 2
Provides an amino molding compound with improved performance, which comprises the following components in parts by weight:
in the embodiment, in order to reduce the shrinkage rate of the amino molding compound, a compound low shrinkage agent is provided, and the mold shrinkage rate is reduced by enhancing the crosslinking effect of the raw materials in the amino molding compound and enhancing the crosslinking effect of the amino molding compound and the compound low shrinkage agent. Specifically, the compound low shrinkage agent comprises the following components in parts by weight:
in this application, stearic acid amide and oleic acid amide are selected as lubricants and release agents. The curing agent is selected from sulfamate. The dispersant is butyl stearate. Furthermore, sulfate is selected as the filler. Furthermore, the plant cellulose is selected from grass crushed pulp.
There is provided a process for the preparation of an amino molding compound of improved properties for the production of an amino molding compound of improved properties as above, comprising the steps of:
(1) preparation of compound low-shrinkage agent
Firstly, weighing alkyl isocyanate, nitrile rubber powder, glass fiber, aluminum powder and superfine rubber powder according to parts by weight, adding a mixed solvent into a reaction kettle, stirring, and controlling the temperature of the solvent in the reaction kettle to be 35 ℃.
Then, adding alkyl isocyanate and glass fiber into the reaction kettle, and continuously stirring for 30 min; then adding the nitrile rubber powder and the aluminum powder, and continuously stirring for 20 min; finally adding the superfine rubber powder and continuously stirring for 60 min.
And finally, pouring out the prepared compound low-shrinkage agent and storing at the temperature of 20 ℃.
(2) Preparation of amino moulding compounds
Firstly, weighing formaldehyde, urea and a curing agent according to parts by weight, adding the formaldehyde, the urea and the curing agent into a reaction kettle in a stirring state, and continuously stirring for 50min at the stirring speed of 100rpm at the temperature of 25 ℃ in the reaction kettle to obtain a mixture I.
And then keeping the temperature and the stirring speed in the reaction kettle unchanged, adding the compound low-shrinkage agent into the first mixture in the reaction kettle according to the parts by weight, and continuously stirring for 30min to obtain a second mixture.
And then, adding melamine, a lubricant, a dispersant, a release agent, a filler and plant cellulose in parts by weight into the second mixture, and increasing the stirring speed to 120rpm to continuously stir for 30 min.
Then, increasing the stirring speed to 300rpm, stirring for 10min, and then starting a vacuum pump to control the vacuum degree to 0.1 MPa; in the kneading stage, the temperature is controlled at 50 ℃, and the stirring is continued for 60 min; in the temperature rise stage, the stirring speed is controlled to be 120rpm, and the stirring is continued for 80 min; when the temperature is controlled to be 73 ℃, the polymerization stage is started, the stirring speed is controlled to be 120rpm, the rotating speed of a stirring paddle is gradually reduced to 70rpm along with the temperature rise, and the polymerization time is 80 min.
Finally, removing vacuum, and continuously cooling the reaction kettle to normal temperature to prepare the amino molding compound.
The amino molding compounds were tested for mold shrinkage and post shrinkage.
Example 3
Provides an amino molding compound with improved performance, which comprises the following components in parts by weight:
in the embodiment, in order to reduce the shrinkage rate of the amino molding compound, a compound low shrinkage agent is provided, and the mold shrinkage rate is reduced by enhancing the crosslinking effect of the raw materials in the amino molding compound and enhancing the crosslinking effect of the amino molding compound and the compound low shrinkage agent. Specifically, the compound low shrinkage agent comprises the following components in parts by weight:
in this application, the lubricant and release agent are selected from zinc stearate and oleamide. The curing agent is phthalic acid. The dispersant is alkylphenol polyethenoxy ether. Furthermore, wood flour is selected as the filler. Further, the plant cellulose is selected from bamboo pulp.
There is provided a process for the preparation of an amino molding compound of improved properties for the production of an amino molding compound of improved properties as above, comprising the steps of:
(1) preparation of compound low-shrinkage agent
Firstly, weighing alkyl isocyanate, nitrile rubber powder, glass fiber, aluminum powder and superfine rubber powder according to parts by weight, adding a mixed solvent into a reaction kettle, stirring, and controlling the temperature of the solvent in the reaction kettle to be 35 ℃.
Then, adding alkyl isocyanate and glass fiber into the reaction kettle, and continuously stirring for 30 min; then adding the nitrile rubber powder and the aluminum powder, and continuously stirring for 20 min; finally adding the superfine rubber powder and continuously stirring for 60 min.
And finally, pouring out the prepared compound low-shrinkage agent and storing at the temperature of 25 ℃.
(2) Preparation of amino moulding compounds
Firstly, weighing formaldehyde, urea and a curing agent according to parts by weight, adding the formaldehyde, the urea and the curing agent into a reaction kettle in a stirring state, and continuously stirring for 50min at the stirring speed of 100rpm at the temperature of 25 ℃ in the reaction kettle to obtain a mixture I.
And then keeping the temperature and the stirring speed in the reaction kettle unchanged, adding the compound low-shrinkage agent into the first mixture in the reaction kettle according to the parts by weight, and continuously stirring for 30min to obtain a second mixture.
And then, adding melamine, a lubricant, a dispersant, a release agent, a filler and plant cellulose in parts by weight into the second mixture, and increasing the stirring speed to 120rpm to continuously stir for 30 min.
Then, increasing the stirring speed to 300rpm, stirring for 10min, and then starting a vacuum pump to control the vacuum degree to 0.12 MPa; in the kneading stage, the temperature is controlled at 45 ℃, and the stirring is continued for 60 min; in the temperature rise stage, the stirring speed is controlled to be 120rpm, and the stirring is continued for 80 min; and when the temperature is controlled to be 80 ℃, entering a polymerization stage, controlling the stirring speed to be 120rpm, gradually reducing the rotation speed of a stirring paddle to 70rpm along with the temperature rise, and polymerizing for 80 min.
Finally, removing vacuum, and continuously cooling the reaction kettle to normal temperature to prepare the amino molding compound.
The amino molding compounds were tested for mold shrinkage and post shrinkage.
Example 4
Provides an amino molding compound with improved performance, which comprises the following components in parts by weight:
in the embodiment, in order to reduce the shrinkage rate of the amino molding compound, a compound low shrinkage agent is provided, and the mold shrinkage rate is reduced by enhancing the crosslinking effect of the raw materials in the amino molding compound and enhancing the crosslinking effect of the amino molding compound and the compound low shrinkage agent. Specifically, the compound low shrinkage agent comprises the following components in parts by weight:
in this application, the lubricant and release agent are selected from stearic acid and stearic acid amide. The curing agent is benzoic acid. The dispersant is stearic acid amide. Further, silicate is selected as the filler. Further, the plant cellulose is selected from straw crushed pulp.
There is provided a process for the preparation of an amino molding compound of improved properties for the production of an amino molding compound of improved properties as above, comprising the steps of:
(1) preparation of compound low-shrinkage agent
Firstly, weighing alkyl isocyanate, nitrile rubber powder, glass fiber, aluminum powder and superfine rubber powder according to parts by weight, adding a mixed solvent into a reaction kettle, stirring, and controlling the temperature of the solvent in the reaction kettle to be 35 ℃.
Then, adding alkyl isocyanate and glass fiber into the reaction kettle, and continuously stirring for 30 min; then adding the nitrile rubber powder and the aluminum powder, and continuously stirring for 20 min; finally adding the superfine rubber powder and continuously stirring for 60 min.
And finally, pouring out the prepared compound low-shrinkage agent and storing at the temperature of 25 ℃.
(2) Preparation of amino moulding compounds
Firstly, weighing formaldehyde, urea and a curing agent according to parts by weight, adding the formaldehyde, the urea and the curing agent into a reaction kettle in a stirring state, and continuously stirring for 50min at the stirring speed of 100rpm at the temperature of 25 ℃ in the reaction kettle to obtain a mixture I.
And then keeping the temperature and the stirring speed in the reaction kettle unchanged, adding the compound low-shrinkage agent into the first mixture in the reaction kettle according to the parts by weight, and continuously stirring for 30min to obtain a second mixture.
And then, adding melamine, a lubricant, a dispersant, a release agent, a filler and plant cellulose in parts by weight into the second mixture, and increasing the stirring speed to 120rpm to continuously stir for 30 min.
Then, increasing the stirring speed to 300rpm, stirring for 10min, and then starting a vacuum pump to control the vacuum degree to 0.1 MPa; in the kneading stage, the temperature is controlled at 55 ℃, and the stirring is continued for 60 min; in the temperature rise stage, the stirring speed is controlled to be 120rpm, and the stirring is continued for 80 min; and when the temperature is controlled to be 70 ℃, entering a polymerization stage, controlling the stirring speed to be 120rpm, gradually reducing the rotation speed of a stirring paddle to 70rpm along with the temperature rise, and polymerizing for 80 min.
Finally, removing vacuum, and continuously cooling the reaction kettle to normal temperature to prepare the amino molding compound.
The amino molding compounds were tested for mold shrinkage and post shrinkage.
Example 5
Provides an amino molding compound with improved performance, which comprises the following components in parts by weight:
in the embodiment, in order to reduce the shrinkage rate of the amino molding compound, a compound low shrinkage agent is provided, and the mold shrinkage rate is reduced by enhancing the crosslinking effect of the raw materials in the amino molding compound and enhancing the crosslinking effect of the amino molding compound and the compound low shrinkage agent. Specifically, the compound low shrinkage agent comprises the following components in parts by weight:
in this application, calcium stearate and zinc stearate are selected as the lubricant and release agent. The curing agent is oxalic acid. The dispersant is alkylphenol polyethenoxy ether. Furthermore, carbonate is selected as the filler. Further, the plant cellulose is selected from bamboo pulp.
There is provided a process for the preparation of an amino molding compound of improved properties for the production of an amino molding compound of improved properties as above, comprising the steps of:
(1) preparation of compound low-shrinkage agent
Firstly, weighing alkyl isocyanate, nitrile rubber powder, glass fiber, aluminum powder and superfine rubber powder according to parts by weight, adding a mixed solvent into a reaction kettle, stirring, and controlling the temperature of the solvent in the reaction kettle to be 35 ℃.
Then, adding alkyl isocyanate and glass fiber into the reaction kettle, and continuously stirring for 30 min; then adding the nitrile rubber powder and the aluminum powder, and continuously stirring for 20 min; finally adding the superfine rubber powder and continuously stirring for 60 min.
And finally, pouring out the prepared compound low-shrinkage agent and storing at the temperature of 25 ℃.
(2) Preparation of amino moulding compounds
Firstly, weighing formaldehyde, urea and a curing agent according to parts by weight, adding the formaldehyde, the urea and the curing agent into a reaction kettle in a stirring state, and continuously stirring for 50min at the stirring speed of 100rpm at the temperature of 25 ℃ in the reaction kettle to obtain a mixture I.
And then keeping the temperature and the stirring speed in the reaction kettle unchanged, adding the compound low-shrinkage agent into the first mixture in the reaction kettle according to the parts by weight, and continuously stirring for 30min to obtain a second mixture.
And then, adding melamine, a lubricant, a dispersant, a release agent, a filler and plant cellulose in parts by weight into the second mixture, and increasing the stirring speed to 120rpm to continuously stir for 30 min.
Then, increasing the stirring speed to 300rpm, stirring for 10min, and then starting a vacuum pump to control the vacuum degree to 0.1 MPa; in the kneading stage, the temperature is controlled at 55 ℃, and the stirring is continued for 60 min; in the temperature rise stage, the stirring speed is controlled to be 120rpm, and the stirring is continued for 80 min; and when the temperature is controlled to be 70 ℃, entering a polymerization stage, controlling the stirring speed to be 120rpm, gradually reducing the rotation speed of a stirring paddle to 70rpm along with the temperature rise, and polymerizing for 80 min.
Finally, removing vacuum, and continuously cooling the reaction kettle to normal temperature to prepare the amino molding compound.
The amino molding compounds were tested for mold shrinkage and post shrinkage.
Comparative example
An amino molding compound formula is provided, which comprises the following components in parts by weight:
in this example, no built low profile agent was added.
In this application, the lubricant and release agent are selected from stearic acid and zinc stearate. The curing agent is oxalic acid and sulfamate. The dispersant is alkylphenol polyethenoxy ether. Furthermore, carbonate is selected as the filler. Further, the plant cellulose is selected from straw crushed pulp.
A process for the preparation of an amino molding compound is provided, for the production of an amino molding compound as above, which comprises the following steps:
(2) preparation of amino moulding compounds
Firstly, weighing formaldehyde, urea and a curing agent according to parts by weight, adding the formaldehyde, the urea and the curing agent into a reaction kettle in a stirring state, and continuously stirring for 50min at the stirring speed of 100rpm at the temperature of 25 ℃ in the reaction kettle to obtain a mixture I.
And then, keeping the temperature in the reaction kettle and the stirring speed unchanged, adding melamine, a lubricant, a dispersant, a release agent, a filler and plant cellulose in parts by weight into the first mixture, and increasing the stirring speed to 120rpm to continuously stir for 30 min.
Then, increasing the stirring speed to 300rpm, stirring for 10min, and then starting a vacuum pump to control the vacuum degree to 0.1 MPa; in the kneading stage, the temperature is controlled at 55 ℃, and the stirring is continued for 60 min; in the temperature rise stage, the stirring speed is controlled to be 120rpm, and the stirring is continued for 80 min; and when the temperature is controlled to be 70 ℃, entering a polymerization stage, controlling the stirring speed to be 120rpm, gradually reducing the rotation speed of a stirring paddle to 70rpm along with the temperature rise, and polymerizing for 80 min.
Finally, removing vacuum, and continuously cooling the reaction kettle to normal temperature to prepare the amino molding compound.
The amino molding compounds were tested for mold shrinkage and post shrinkage.
Following the above preparation and testing procedures, the following comparative tables are provided
| Examples | Compound low shrinkage agent addition amount (parts) | Modulus shrinkage (%) | Post shrinkage (%) |
| Example 1 | 2 | 0.60 | 0.36 |
| Example 2 | 1 | 0.65 | 0.40 |
| Example 3 | 3 | 0.45 | 0.15 |
| Example 4 | 4 | 0.60 | 0.32 |
| Example 5 | 5 | 0.55 | 0.45 |
| Comparative example | 0 | 0.90 | 0.85 |
The comparison shows that the compound low shrinkage agent can substantially reduce the mold shrinkage rate and the post shrinkage rate of the amino molding plastic, and meanwhile, the reasonable proportion and the addition amount of the compound shrinkage agent can obviously reduce the shrinkage rate.
The application creatively provides a compound low-shrinkage agent, which is applied to the performance improvement of amino molding plastic, and particularly improves the anti-shrinkage effect of the amino molding plastic. Specifically, by adding the compound low shrinkage agent into the raw materials of the amino molding compound, the cross-linking effect of the raw materials of the amino molding compound and the components in the compound low shrinkage agent can be realized, the mechanical toughness can be improved, the shrinkage can be reduced, the stability of a large electrical appliance panel is ensured, and the problems of collapse, warping and the like are effectively prevented. The formula of the invention is reasonable in arrangement, the mechanical toughness is improved, the contractibility is reduced, and the practicability is stronger.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. An amino molding compound with improved performance is characterized by comprising the following components in parts by weight:
2. an amino molding compound with improved properties as claimed in claim 1, wherein the built low profile agent comprises the following components in parts by weight:
3. an amino molding compound having improved properties as claimed in claim 1, wherein the lubricant and mold release agent are selected from the group consisting of stearic acid, calcium stearate, zinc stearate, stearic acid amide, oleic acid amide.
4. An amino molding compound with improved properties as claimed in claim 1, wherein the curing agent is one or more of oxalic acid, phthalic acid, benzoic acid, and sulfamate.
5. An amino molding compound with improved properties as claimed in claim 1, wherein the dispersant is one or more of alkylphenol ethoxylates, butyl stearate and stearic acid amide.
6. An amino molding compound with improved properties as claimed in claim 1, characterized in that the filler is one or more of wood flour, carbonates, sulfates, silicates.
7. An amino molding compound with improved properties as claimed in claim 1, wherein the plant cellulose is selected from bamboo pulp, straw crushed pulp and grass crushed pulp.
8. A process for the preparation of an amino molding composition with improved properties, characterized in that it is used for the production of an amino molding composition with improved properties as claimed in claim 1, which comprises the following steps:
(1) preparation of compound low-shrinkage agent
Firstly, weighing alkyl isocyanate, nitrile rubber powder, glass fiber, aluminum powder and superfine rubber powder according to parts by weight, adding a mixed solvent into a reaction kettle, stirring, and controlling the temperature of the solvent in the reaction kettle to be 30-35 ℃;
then, adding alkyl isocyanate and glass fiber into the reaction kettle, and continuously stirring for 20-30 min; then adding the nitrile rubber powder and the aluminum powder, and continuously stirring for 20-30 min; finally adding superfine rubber powder, and continuously stirring for 50-60 min;
finally, pouring out the prepared compound low-shrinkage agent and storing at the temperature of 20-25 ℃;
(2) preparation of amino moulding compounds
Firstly, weighing formaldehyde, urea and a curing agent according to parts by weight, adding the formaldehyde, the urea and the curing agent into a reaction kettle in a stirring state, continuously stirring for 50-60min at the stirring speed of 50-100rpm at the temperature of 20-25 ℃ in the reaction kettle to obtain a mixture I;
then, keeping the temperature and the stirring speed in the reaction kettle unchanged, adding the compound low-shrinkage agent into the first mixture in the reaction kettle according to the parts by weight, and continuously stirring for 20-30min to obtain a second mixture;
then, adding melamine, a lubricant, a dispersant, a release agent, a filler and plant cellulose in parts by weight into the second mixture, and increasing the stirring speed to 120rpm to continuously stir for 30 min;
then, increasing the stirring speed to 300rpm, stirring for 5-10min, starting a vacuum pump, and controlling the vacuum degree to be 0.08-0.2 MPa; in the kneading stage, the temperature is controlled at 45-55 ℃, and the stirring is continued for 60 min; in the temperature rise stage, the stirring speed is controlled to be 120rpm, and the stirring is continuously carried out for 80-110 min; controlling the temperature to be 70-85 ℃, entering a polymerization stage, controlling the stirring speed to be 120rpm, gradually reducing the rotation speed of a stirring paddle to 70rpm along with the temperature rise, and controlling the polymerization time to be 60-80 min;
finally, removing vacuum, and continuously cooling the reaction kettle to normal temperature to prepare the amino molding compound.
9. The process for preparing an amino molding compound having improved properties as claimed in claim 8, wherein the vacuum of the vacuum pump is controlled to 0.1 MPa.
10. A process for preparing an amino molding compound having improved properties as claimed in claim 8, wherein the polymerization time is 80 min.
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