CN109439123A - A kind of aqueous damping coating acrylic emulsion and preparation method thereof and a kind of aqueous damping coating - Google Patents
A kind of aqueous damping coating acrylic emulsion and preparation method thereof and a kind of aqueous damping coating Download PDFInfo
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- CN109439123A CN109439123A CN201811170747.6A CN201811170747A CN109439123A CN 109439123 A CN109439123 A CN 109439123A CN 201811170747 A CN201811170747 A CN 201811170747A CN 109439123 A CN109439123 A CN 109439123A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09D133/10—Homopolymers or copolymers of methacrylic acid esters
- C09D133/12—Homopolymers or copolymers of methyl methacrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
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Abstract
The present invention relates to a kind of aqueous damping coating acrylic emulsion and preparation method thereof and a kind of aqueous damping coatings.On the basis of the acrylic emulsion dry weight, it is made by the monomer for including following components: acrylic ester monomer 80wt%-99wt%, function monomer acid 0.1wt%-10wt% and emulsifier 0.1wt%-10wt%.Using the emulsion polymerization of substep, the pre-emulsion of first polymeric acrylic acid esters monomer, then polymerized functional monomer is sour again.This special polymerization assigns the extremely strong surface hydrophilicity of latex particle, vapor is along the hydrophilic surface quick release of latex particle in film forming procedure, so as to meet the execution conditions of (100 DEG C or more) of the direct high temperature of coating baking film forming, eliminates general aqueous damping coating high-temperature baking film forming and expansion the blistering even critical defect of rupture occur.
Description
Technical field
The present invention relates to acrylic emulsions, and in particular to a kind of acrylic emulsion for aqueous damping coating, Yi Jiyi
Kind can high-temperature baking construction type aqueous damping coating, belong to acrylic emulsion synthesis field.
Background technique
The damping material used in China's automobile industry at present is mostly pitch material, mostly by pitch directly with it is various inorganic
Filler mixes.Contain a large amount of fused ring compounds and nitrogenous, sulphur high boiling product in pitch, it is in use once heated
Volatile organic compounds (VOC) can be released, injury is generated to human body.Therefore, aqueous damping coating comes into being, it has
The advantages that easy for construction safe, environmentally protective, adhesion strength is high, and can meet the needs of automotive light weight technology.In recent years, national
Environmental requirement is further increased, aqueous damping coating shows huge market application prospect.
Automobile-used damping paint construction is directly entered 150 DEG C on the electrophoretic paint after Car Body Painting together with floating coating
Line is toasted, during which without prebake conditions, and its construction spraying thickness is in 2-6mm.When aqueous damping coating is directly entered high temperature
When baking, film coated surface rapid draing hinders internal moisture evolution, and at this moment a large amount of moisture meets high-temperature evaporation, works as vapor
Phenomena such as pressure is sufficiently large, and film coated surface bursting is cracked, bulge.Chinese patent CN106700303A and
CN106554686A passes through respectively to be selected the strong defoaming agent for reducing surface tension and adds in emulsion system one or more of
Surfactant solves the problems, such as that high temperature coating is bubbled, but expection is not achieved in effect.Chinese patent CN107880654A is using fastly
The special molecular structure of dry emulsion is by moisture quick release；By adding heat filling adjusting coating internal-external temperature difference, moisture is controlled
Gasification and evolution speed；Porous aggregate, which is added, promotes internal steam smoothly to export, this formula system is complicated, higher cost.
Need to develop it is a can direct baking type damping paint acrylic emulsion, meet the requirement of high-temperature baking.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide one kind can the painting of high-temperature baking construction type aqueous damping
Expect to use acrylic emulsion, vapor is along the hydrophilic surface quick release of latex particle in film forming procedure, so as to meet
The execution conditions of (100 DEG C or more) of the direct high temperature of aqueous damping coating baking film forming, eliminate general aqueous damping coating high temperature
There is the expansion even critical defect of rupture in baking film forming.
It is another object of the present invention to provide it is described can high-temperature baking construction type aqueous damping coating propylene yogurt
The preparation method of liquid, it uses the emulsion polymerization of substep, then the pre-emulsion of first polymeric acrylic acid esters monomer polymerize again
Function monomer acid.
The present invention also provides a kind of aqueous damping coatings.
In order to reach the goals above, the present invention uses following technical method:
One kind can high-temperature baking construction type aqueous damping coating acrylic emulsion, solid content 30wt%-50wt%,
It is made, is based on the monomer gross mass (i.e. lotion dry weight) by the monomer for including following components:
Acrylic ester monomer 80wt%-99wt%, preferably 90wt%-97wt%, more preferable 92wt%-96wt%；
Function monomer acid 0.1wt%-10wt%, preferably 1wt%-8wt%, more preferable 2wt%-7wt%；
Emulsifier 0.1wt%-10wt%, preferably 0.3wt%-3wt%, more preferable 0.5wt%-2wt%.
In the present invention, the acrylic ester monomer is one of following substance or a variety of: (methyl) acrylic acid first
Ester, (methyl) ethyl acrylate, (methyl) butyl acrylate, (methyl) 2-EHA, the tertiary fourth of (methyl) acrylic acid
Ester, (methyl) isobutyl acrylate, (methyl) isobornyl acrylate, (methyl) lauryl acrylate, (methyl) acrylic acid
Octadecyl ester, (methyl) hydroxy-ethyl acrylate, (methyl) hydroxypropyl acrylate, Isooctyl acrylate monomer；It is preferred that methyl methacrylate
And/or Isooctyl acrylate monomer.
In the present invention, the function monomer acid is one of following substance or a variety of: acrylic acid, methacrylic acid, clothing
Health acid, crotonic acid, fumaric acid, maleic acid.
One of as a preferred technical scheme, function monomer acid of the present invention is methacrylic acid.
As a preferred technical scheme two, function monomer acid of the present invention is the mixing of methacrylic acid and acrylic acid
The mass ratio of object, methacrylic acid and acrylic acid is 1:6-6:1, preferably 1:4-4:1, more preferable 1:2-2:1.Acrylic acid content is high
High temperature blistering improves, but side effect is the water-fast variation of paint film.Acrylic acid hydrophily is better than methacrylic acid, and independent acrylic acid is resistance to
Water is poor, and independent methacrylic acid high temperature blistering is not so good as acrylic acid.Two aspect performances of the two collocation can be taken into account more excellent.
In the present invention, the emulsifier is one of following substance or a variety of: lauryl sodium sulfate, detergent alkylate
Sodium sulfonate, fatty alcohol polyoxyethylene ether and its salt and fatty alcohol ether phosphate and its salt, preferably sodium dodecyl sulfate.
It is a kind of can high-temperature baking construction type aqueous damping coating acrylic emulsion preparation method, comprising the following steps:
(1) partial emulsifier, part water, acrylic ester monomer are added to pre-emulsification in pre-emulsification kettle and obtain pre-emulsification
Liquid；
(2) residual emulsifier and remaining water are added in reaction kettle, open stirring and heating；50-90 is risen to temperature
DEG C, the 10wt%-80wt% for being initially added into step (1) pre-emulsion and initiator total amount causes polymerization；
(3) 0.5-1h is kept the temperature after being added, function monomer acid and remaining initiator is then added, is protected after addition
Warm 0.5-3h；
(4) 45 DEG C are cooled to hereinafter, filtering and discharging after neutralizer neutralizes is added.
Emulsifier is the 30%-60%, preferably 40%-50% of total emulsifiers dosage in step (1) of the present invention；
The dosage of water is the 10%-30% of total water consumption, preferably 15%-25%.
In step (1) of the present invention and (2), without using function monomer acid.The function monomer acid includes but unlimited
In following substance: acrylic acid, methacrylic acid, itaconic acid, crotonic acid, fumaric acid, maleic acid.
In step (3) of the present invention, acrylic ester monomer is not used, the acrylic ester monomer includes but not
It is limited to following substance: (methyl) methyl acrylate, (methyl) ethyl acrylate, (methyl) butyl acrylate, (methyl) acrylic acid
2- ethylhexyl, (methyl) tert-butyl acrylate, (methyl) isobutyl acrylate, (methyl) isobornyl acrylate, (methyl)
Lauryl acrylate, (methyl) octadecyl acrylate, (methyl) hydroxy-ethyl acrylate, (methyl) hydroxypropyl acrylate, propylene
The different monooctyl ester of acid.
Initiator of the present invention is one of ammonium persulfate, sodium peroxydisulfate, potassium peroxydisulfate or a variety of.
The dosage of initiator of the present invention is 0.1wt%-1wt%, preferably 0.3wt%-0.7wt%, is done with lotion
On the basis of weight.
Neutralizer in step (4) of the present invention is selected from one of organic base and/or inorganic base or a variety of, described to have
The preferred amine of machine alkali such as triethylamine, N, N- dimethylethanolamine and/or ammonium hydroxide, the inorganic base preferred alkali metal hydroxide
Such as sodium hydroxide；The preferred N of neutralizer, N- dimethylethanolamine adjust lotion pH and are not less than 7.
It is of the invention can high-temperature baking construction type aqueous damping coating acrylic emulsion, can be with filler, dispersing agent, increasing
Thick dose etc. is configured to aqueous damping coating.
The present invention also provides one kind can high-temperature baking construction type aqueous damping coating, include consisting of, be based on following original
The gross mass of material:
Acrylic emulsion 30wt%-50wt% of the present invention, preferably 35wt%-45wt%, more preferable 38wt%-
42wt%；
Defoaming agent 0.01wt%-0.8wt%, preferably 0.05wt%-0.5wt%, more preferable 0.1wt%-0.3wt%；
Dispersing agent 0.05wt%-2wt%；It is preferred that 0.1wt%-1wt%, more preferable 0.3wt%-0.6wt%；
Surfactant 0.01wt%-0.8wt%, preferably 0.05wt%-0.5wt%, more preferable 0.2wt%-
0.4wt%；
Carbon black 0.01wt%-0.8wt%, preferably 0.05wt%-0.5wt%, more preferable 0.1wt%-0.3wt%；
Powdered whiting 35wt%-55wt%, preferably 38wt%-52wt%, more preferable 42wt%-48wt%；
Mica powder 1wt%-15wt%, preferably 3wt%-12wt%, more preferable 5wt%-10wt%；
Starch 0.1wt%-8wt%, preferably 0.5wt%-5wt%, more preferable 2wt%-4wt%；
Swelling agent 0.01wt%-0.8wt%, preferably 0.05wt%-0.5wt%, more preferable 0.2wt%-0.4wt%；
Thickener 0.1wt%-8wt%, preferably 0.5wt%-5wt%, more preferable 1wt%-3wt%.
Foam Star of the defoaming agent of the present invention including but not limited to BASF China
ST2410AC, Foamaster NXZ of Corning (China) Co., Ltd, Foamex 1488 of Digao (China) Co., Ltd etc..
Orotan 731A, Luo Menha of the dispersing agent of the present invention including but not limited to Tao Shi (China) Co., Ltd
Orotan 1288, C20 of Wanhua Chemical Group Co., Ltd. of this (China) Co., Ltd etc..
LCN-407 of the surfactant of the present invention including but not limited to Clariant (China) Co., Ltd, Sol
Tie up the Rhodafac RP-710 etc. of (China) Co., Ltd.
Carbon black of the present invention is safe including but not limited to FW-200, the Hebei Cangzhou gold of Degussa (China) Co., Ltd
Carbon black Co., Ltd N300 etc..
Heavy carbonic acid of the powdered whiting of the present invention including but not limited to 800 mesh of Changzhou Calcium Carbonate Company
Calcium, powdered whiting of Zhejiang Qin Tang Gai Ye limited liability company etc..
Mica powder, Shi Jia of the mica powder of the present invention including but not limited to 800 mesh of Chuzhou sericite Co., Ltd
The mica powder etc. of Zhuan Chenxing Industrial Co., Ltd..
Expancel of the swelling agent of the present invention including but not limited to Akzo Nobel (China) Co., Ltd
031WUFX40, swelling agent of Changsha Dong Ke building materials Science and Technology Ltd. etc..
Thickener of the present invention is including but not limited to Wanhua Chemical Group Co., Ltd. A801, U605, U905
Deng.
Can adopt prepare with method known in this field it is described can high-temperature baking construction type aqueous damping coating.
The positive effect of the present invention is:
The present invention provides one kind can direct high-temperature baking construction type aqueous damping coating acrylic emulsion, emulsion particle
Sublist face has extremely strong hydrophily, in film forming procedure vapor along the hydrophilic surface quick release of latex particle, thus
The execution conditions that can satisfy (100 DEG C or more) of the direct high temperature of coating baking film forming are eliminated general aqueous damping coating high temperature and are dried
It is roasted into film and the expansion even critical defect of rupture occurs.
The method for preparing the acrylic emulsion of the invention first polymerize third since it uses the emulsion polymerization of substep
The pre-emulsion of olefin(e) acid esters monomer, then polymerized functional monomer is sour again, to assign latex particle surface a large amount of hydrophilic group
Group, in damping paint high-temperature baking film forming procedure, vapor can not destroy paint film along the surface quick release of latex particle
Appearance.
There is excellent damping capacity by aqueous damping coating prepared by acrylic emulsion of the invention, fully meet national standard
It is required that.There is lower water absorption rate simultaneously, can satisfy the requirement of automobile-used damping paint water resistance.
Specific embodiment
The following examples will be further described the present invention, but not thereby limiting the invention.
The raw material and source used in specific embodiment are shown in Table 1.
Table 1: raw material and source
| Referred to as | Compound | Manufacturer |
| SDS | Lauryl sodium sulfate | Shanghai You Yang Industrial Co., Ltd. |
| MMA | Methyl methacrylate | Ying Chuan Specialty Chemical (Shanghai) Co., Ltd. |
| EHA | Isooctyl acrylate monomer | Wanhua Chemical Group Co., Ltd. |
| MAA | Methacrylic acid | Wanhua Chemical Group Co., Ltd. |
| AA | Acrylic acid | Wanhua Chemical Group Co., Ltd. |
| IA | Itaconic acid | Aladdin reagent |
Embodiment 1
(1) by 300g methyl methacrylate, 270g Isooctyl acrylate monomer, 1.5g lauryl sodium sulfate and 180g go from
Sub- water is added separately to progress pre-emulsification in the pre-emulsification kettle of 1L and obtains pre-emulsion；
(2) 1.2g lauryl sodium sulfate, 680g water are added in reaction kettle, open stirring and heating.To reaction kettle
Interior temperature rises to 85 DEG C, starts a dropping step (1) pre-emulsion and 0.75g ammonium persulfate, time for adding 3h；
(3) completion of dropwise addition keeps the temperature 0.5h, continues that 30g methacrylic acid is added dropwise and 0.75g ammonium persulfate, time for adding are
1h；Completion of dropwise addition keeps the temperature 1h；
(4) 45 DEG C are cooled to hereinafter, 12gN is added, propylene yogurt is made in filtering and discharging after N- dimethylethanolamine neutralizes
Liquid.
(5) aqueous damping coating is prepared according to 2 formula of table.
Table 2: aqueous damping coating formula
Embodiment 2-11
Using method same as Example 1, but the change according to table 3 prepare acrylic emulsion raw material dosage and
Type prepares aqueous damping coating.
Comparative example 1-4
Using method same as Example 1, but the change according to table 3 prepare acrylic emulsion raw material dosage and
Type prepares aqueous damping coating.
Table 3: embodiment and comparative example acrylic emulsion raw material dosage (g) and type
The high gentle and kind painting frothing capacity test of aqueous damping coating: aqueous damping coating is scratched to steel plate, with a thickness of
Template is directly observed film cracking and blister formation as 140 DEG C of baking 30min by 2mm.Film is then placed in normal-temperature water
Middle immersion for 24 hours, observes paint film appearance.As shown in table 4.
Water absorption rate test: it by the m1 that weighs after lotion drying film forming, is put into distilled water and impregnates for 24 hours, take out and dry emulsion film
The water on surface, weigh m2.Water absorption rate=(m2-m1)/m1.The results are shown in Table 4.
Table 4: the high-temperature baking visual condition and water absorption rate of aqueous damping coating
| Embodiment | Appearance of film | Water absorption rate (%) |
| 1 | Without cracking, no blistering | 9.87 |
| 2 | Without cracking, no blistering | 12.73 |
| 3 | Without cracking, no blistering | 12.58 |
| 4 | Without cracking, no blistering | 8.93 |
| 5 | Without cracking, no blistering | 9.05 |
| 6 | Without cracking, no blistering | 9.38 |
| 7 | Without cracking, no blistering | 9.56 |
| 8 | Without cracking, no blistering | 9.42 |
| 9 | Without cracking, no blistering | 13.51 |
| 10 | Without cracking, no blistering | 9.91 |
| 11 | Without cracking, no blistering | 11.02 |
| Comparative example 1 | Cracking, blistering | / |
| Comparative example 2 | Cracking, blistering | / |
| Comparative example 3 | Cracking, blistering | / |
| Comparative example 4 | Cracking, blistering | / |
The test of aqueous damping coating damping capacity: using 18258 method of national standard GB/T, tests the resistance under different temperatures
Buddhist nun's coefficient, the results are shown in Table 5.
Table 5: the damping capacity of aqueous damping coating
As can be seen from Table 4, embodiment 1-11 paint film appearance is without cracking without blistering, the wherein water suction of embodiment 4-8 paint film
Rate is lower than other embodiments, this is attributed to acrylic acid hydrophily and is better than methacrylic acid, causes paint film hydrophily too strong, water absorption rate
It gets higher.Therefore, while acrylic acid and methacrylic acid being selected to can reach optimal effectiveness.Table 5 is as can be seen that embodiment 4-8 has
There is excellent damping capacity.
Finally it should be noted that above embodiments are only described to the preferred embodiment of the present invention, rather than it is right
The limitation of the scope of the present invention, although the invention is described in detail with reference to the preferred embodiments, the ordinary skill of this field
The all variations and modifications that personnel should be appreciated that modification or equivalent replacement of the technical solution of the present invention are made and make, should all
It falls within the scope of protection determined by the claims of the present invention.
Claims (10)
1. one kind can high-temperature baking construction type aqueous damping coating acrylic emulsion, which is characterized in that it is based on lotion dry weight, by
Monomer including following components is made:
Acrylic ester monomer 80wt%-99wt%, preferably 90wt%-97wt%, more preferable 92wt%-96wt%；
Function monomer acid 0.1wt%-10wt%, preferably 1wt%-8wt%, more preferable 2wt%-7wt%；
Emulsifier 0.1wt%-10wt%, preferably 0.3wt%-3wt%, more preferable 0.5wt%-2wt%.
2. acrylic emulsion according to claim 1, which is characterized in that the acrylic ester monomer is following substance
One of or it is a variety of: (methyl) methyl acrylate, (methyl) ethyl acrylate, (methyl) butyl acrylate, (methyl) propylene
Sour 2- ethylhexyl, (methyl) tert-butyl acrylate, (methyl) isobutyl acrylate, (methyl) isobornyl acrylate, (first
Base) lauryl acrylate, (methyl) octadecyl acrylate, (methyl) hydroxy-ethyl acrylate, (methyl) hydroxypropyl acrylate, third
The different monooctyl ester of olefin(e) acid；It is preferred that methyl methacrylate and/or Isooctyl acrylate monomer.
3. acrylic emulsion according to claim 1 or 2, which is characterized in that the function monomer acid is in following substance
It is one or more: acrylic acid, methacrylic acid, itaconic acid, crotonic acid, fumaric acid, maleic acid.
4. acrylic emulsion according to claim 1-3, which is characterized in that the function monomer acid is methyl-prop
The mass ratio of the mixture of olefin(e) acid and acrylic acid, methacrylic acid and acrylic acid is 1:6-6:1, preferably 1:4-4:1, more preferable 1:
2-2:1。
5. acrylic emulsion according to claim 1-4, which is characterized in that the emulsifier is selected from dodecyl
Sodium sulphate, neopelex, fatty alcohol polyoxyethylene ether and its salt and one of fatty alcohol ether phosphate and its salt
Or a variety of, preferably sodium dodecyl sulfate.
6. a kind of method for preparing the described in any item acrylic emulsions of claim 1-5, comprising the following steps:
(1) partial emulsifier, part water, acrylic ester monomer are added to pre-emulsification in pre-emulsification kettle and obtain pre-emulsion；
(2) residual emulsifier and remaining water are added in reaction kettle, open stirring and heating；50-90 DEG C is risen to temperature, is opened
Begin that step (1) pre-emulsion is added and the 10wt%-80wt% of initiator total amount causes polymerization；
(3) 0.5-1h is kept the temperature after being added, function monomer acid and remaining initiator is then added, is kept the temperature after addition
0.5-3h；
(4) 45 DEG C are cooled to hereinafter, filtering and discharging after neutralizer neutralizes is added.
7. according to the method described in claim 6, it is characterized in that, emulsifier is that total emulsifiers are used in the step (1)
The 30%-60% of amount, preferably 40%-50%.
8. method according to claim 6 or 7, which is characterized in that the dosage of water is total water consumption in the step (1)
10%-30%, preferably 15%-25%.
9. according to the described in any item methods of claim 6-8, which is characterized in that the neutralizer in the step (4) is selected from three
Ethamine, N, one of N- dimethylethanolamine, ammonium hydroxide, sodium hydroxide or a variety of.
10. a kind of aqueous damping coating, which is characterized in that the aqueous damping coating includes described in any one of claim 1-5
Acrylic emulsion or according to any one of claim 6-9 the method prepare acrylic emulsion.
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| CN112341883A (en) * | 2020-11-16 | 2021-02-09 | 三友（天津）高分子技术有限公司 | Baking type water-based damping coating |
| CN112409869A (en) * | 2020-11-16 | 2021-02-26 | 三友（天津）高分子技术有限公司 | Water-based damping material for automobile |
| CN115141503A (en) * | 2021-03-29 | 2022-10-04 | 万华化学集团股份有限公司 | Bio-based polymer cement waterproof coating |
| CN115141503B (en) * | 2021-03-29 | 2023-09-19 | 万华化学集团股份有限公司 | Bio-based polymer cement waterproof coating |
| CN114369400A (en) * | 2021-12-17 | 2022-04-19 | 苏州赛伍应用技术股份有限公司 | Water-based acrylic damping paint and preparation method thereof |
| CN114369400B (en) * | 2021-12-17 | 2023-02-10 | 苏州赛伍应用技术股份有限公司 | Water-based acrylic damping paint and preparation method thereof |
| CN117551127A (en) * | 2024-01-10 | 2024-02-13 | 万华化学集团股份有限公司 | Nitrososilane derivative and application thereof in preparation of water-based acrylic paint |
| CN117551127B (en) * | 2024-01-10 | 2024-04-09 | 万华化学集团股份有限公司 | Nitrososilane derivative and application thereof in preparation of water-based acrylic paint |
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