CN107128932A - A kind of preparation method for the VOC hydrophobic silicas adsorbed - Google Patents
A kind of preparation method for the VOC hydrophobic silicas adsorbed Download PDFInfo
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- CN107128932A CN107128932A CN201710308641.7A CN201710308641A CN107128932A CN 107128932 A CN107128932 A CN 107128932A CN 201710308641 A CN201710308641 A CN 201710308641A CN 107128932 A CN107128932 A CN 107128932A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/141—Preparation of hydrosols or aqueous dispersions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/141—Preparation of hydrosols or aqueous dispersions
- C01B33/142—Preparation of hydrosols or aqueous dispersions by acidic treatment of silicates
- C01B33/143—Preparation of hydrosols or aqueous dispersions by acidic treatment of silicates of aqueous solutions of silicates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/16—Preparation of silica xerogels
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/16—Preparation of silica xerogels
- C01B33/163—Preparation of silica xerogels by hydrolysis of organosilicon compounds, e.g. ethyl orthosilicate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a kind of preparation method for the VOC hydrophobic silicas adsorbed, the preparation method comprises the following steps：(1) nitric acid, deionized water and absolute ethyl alcohol are made into mixed liquor in a reservoir；(2) silica source, absolute ethyl alcohol and deionized water are made into mixed liquor, then add composite coupler, stirred；(3) solution for obtaining step (2) is quickly poured into the mixed liquor that step (1) is obtained, and solution PH controls between 2 and 6, to stir a few hours；(4) container is sealed and placed, be aged 2h；(5) by the gel suction filtration after surface is modified and solvent is replaced, wash, stood under normal temperature；(6) clean gel is dried, then carries out air flow super, obtain finished product.The present invention it is a kind of for VOC adsorb hydrophobic silica preparation method, hydrophobic silica is adsorbed variety classes VOC molecules, not only environmental protection and also cost is low.
Description
Technical field
The present invention relates to a kind of preparation method for the VOC hydrophobic silicas adsorbed, belong to coating agent technical field.
Background technology
VOC is VOC (volatile organic compounds) english abbreviation, with volatilization
Property, atmospheric photochemical reaction can be participated in, is that can produce the volatile organic matter of harm.VOC is VOC, to people
Body health has tremendous influence.When the VOC in room reaches finite concentration, people can feel headache, nausea, vomit in the short time
Tell, it is weak etc., tic, stupor occur when serious, and liver, kidney, brain and the nervous system of people can be hurt, cause note
Recall the serious consequences such as power decline.The coating used during decoration design for residence is one of indoor VOC main source.VOC rooms
Outside essentially from fuel combustion and communications and transportation.
In VOCs treatment technique, absorption is high treating effect, using one of wider method, and adsorbent is mainly
Activated carbon.Activated carbon mainly makes of timber, can increase the consumption of timber, not environmentally friendly enough, and cost is higher.It is badly in need of opening at present
The inexpensive VOC sorbing materials that to send out a kind of environmentally friendly.
The content of the invention
It is an object of the invention to provide a kind of preparation method for the VOC hydrophobic silicas adsorbed, make hydrophobic two
Silica can adsorb variety classes VOC molecules, not only environmental protection and also cost is low.
In order to solve the above technical problems, a kind of preparation method for the VOC hydrophobic silicas adsorbed of the present invention, should
Preparation method comprises the following steps：
(1) nitric acid, deionized water and absolute ethyl alcohol are made into mixed liquor in a reservoir；
(2) silica source, absolute ethyl alcohol and deionized water are made into mixed liquor, then add composite coupler, stirred
Mix uniform；
(3) solution for obtaining step (2) is quickly poured into the mixed liquor that step (1) is obtained, and solution PH is controlled in 2-6
Between, stir a few hours；
(4) container is sealed and placed, be aged 2h；
(5) by the gel suction filtration after surface is modified and solvent is replaced, wash, stood under normal temperature；
(6) clean gel is dried, then carries out air flow super, obtain finished product.
Preferably, silica source described in the step (2) uses tetraethyl orthosilicate or waterglass.
Preferably, the weight ratio of silica source, absolute ethyl alcohol and deionized water is 1 in the step (2):
(3.0-4.5):(6.0-7.0)。
Preferably, the weight ratio of silica source, absolute ethyl alcohol and deionized water is 1 in the step (2):3.8:
6.4。
Preferably, composite coupler contains straight chain by a kind of silane coupler containing benzene radicals, one kind in the step (2)
Groups silane coupler and a kind of silane coupler containing epoxide group are constituted.
Preferably, silane coupler containing benzene radicals is phenyltrimethoxysila,e, diphenyl two in the step (2)
Methoxy silane, aminomethyl phenyl dimethoxysilane or phenyl triethoxysilane.
Preferably, the silane coupler containing straight chained alkyl group is n-octytriethoxysilane, 12 in the step (2)
Alkyl trimethoxysilane, n-propyl trimethoxy silane, MTMS, vinyl front three oxosilane, vinyl
Triethoxysilane, 3- aminopropyl triethoxysilanes, N- (2- aminoethyl -3- aminopropyls) methyl dimethoxysilanes or N-
(2- aminoethyl -3- aminopropyls) trimethoxy silane.
Preferably, silane coupler containing epoxide group is 2- (3,4- epoxycyclohexyl) ethyl three in the step (2)
Ethoxysilane, 2- (3,4- epoxycyclohexyl) ethyl trimethoxy silane, 3- (2,3- the third oxygen of epoxy) propyl trimethoxy silicon
Alkane or 3- (2,3- the third oxygen of epoxy) propyl-triethoxysilicane.
Preferably, a kind of silane coupler containing benzene radicals, a kind of silane containing straight chained alkyl group are even in the step (2)
Connection agent and a kind of silane coupler containing epoxide group addition are 0.05-1 times of silica molal quantity in silicon source.
Preferably, a kind of silane coupler containing benzene radicals, a kind of silane containing straight chained alkyl group are even in the step (2)
Connection agent and a kind of silane coupler containing epoxide group addition are 0.3-0.5 times of silica molal quantity in silicon source.
A kind of preparation method for the VOC hydrophobic silicas adsorbed of the present invention, enables hydrophobic silica to adsorb
Variety classes VOC molecules, the volatile solvents containing phenyl ring such as absorption benzene,toluene,xylene, absorption can be played in the work environment
The volatile organic matter such as the volatile solvents such as hexane, hexamethylene, butanol and ketone, acetone.And hydrophobic performance is stable, work is produced
Sequence is simple, is adapted to big industrial production.
Embodiment
Embodiment of the present invention is described in detail with reference to specific embodiment.It should be appreciated that the reality of the present invention
Apply and be not limited to the following examples, any formal accommodation and/or change made to the present invention fall within this hair
Bright protection domain.
Embodiment 1
A kind of preparation method for the VOC hydrophobic silicas adsorbed, the preparation method comprises the following steps：
(1) nitric acid, deionized water and absolute ethyl alcohol are made into mixed liquor in conical flask, stir 3min；
(2) silica source tetraethyl orthosilicate, absolute ethyl alcohol and deionized water are made into mixed liquor, silica silicon
The weight ratio in source, absolute ethyl alcohol and deionized water is 1:3.0:6.0, composite coupler is then added, composite coupler is by one kind
The phenyltrimethoxysila,e of silane coupler containing benzene radicals, a kind of straight chained alkyl that contains roll into a ball silane coupler n-octyl triethoxy
Silane and a kind of silane coupler containing epoxide group 2- (3,4- epoxycyclohexyl) ethyl triethoxysilane are constituted, and one kind contains benzene
Cyclic group silane coupler, one kind roll into a ball silane coupler containing straight chained alkyl and a kind of addition of silane coupler containing epoxide group is equal
For 0.05 times of silica molal quantity in silicon source, stir；
(3) solution for obtaining step (2) is quickly poured into the mixed liquor that step (1) is obtained, and solution PH is controlled 2, is stirred
Mix a few hours；
(4) container is sealed and placed, be aged 2h；
(5) by the gel suction filtration after surface is modified and solvent is replaced, wash, stood under normal temperature；
(6) clean gel is dried, then carries out air flow super, obtain finished product.
Embodiment 2
A kind of preparation method for the VOC hydrophobic silicas adsorbed, the preparation method comprises the following steps：
(1) nitric acid, deionized water and absolute ethyl alcohol are made into mixed liquor in conical flask, stir 3min；
(2) silica source tetraethyl orthosilicate, absolute ethyl alcohol and deionized water are made into mixed liquor, silica silicon
The weight ratio in source, absolute ethyl alcohol and deionized water is 1:3.5:6.2, composite coupler is then added, composite coupler is by one kind
The dimethoxydiphenylsilane of silane coupler containing benzene radicals, a kind of straight chained alkyl that contains roll into a ball silane coupler dodecyl front three
TMOS and a kind of silane coupler containing epoxide group 2- (3,4- epoxycyclohexyl) ethyl trimethoxy silane are constituted, a kind of
Silane coupler containing benzene radicals, a kind of silane coupler containing epoxide group containing straight chained alkyl group's silane coupler and one kind are added
Amount is 0.1 times of silica molal quantity in silicon source, is stirred；
(3) solution for obtaining step (2) is quickly poured into the mixed liquor that step (1) is obtained, and solution PH is controlled 3, is stirred
Mix a few hours；
(4) container is sealed and placed, be aged 2h；
(5) by the gel suction filtration after surface is modified and solvent is replaced, wash, stood under normal temperature；
(6) clean gel is dried, then carries out air flow super, obtain finished product.
Embodiment 3
A kind of preparation method for the VOC hydrophobic silicas adsorbed, the preparation method comprises the following steps：
(1) nitric acid, deionized water and absolute ethyl alcohol are made into mixed liquor in conical flask, stir 3min；
(2) silica source tetraethyl orthosilicate, absolute ethyl alcohol and deionized water are made into mixed liquor, silica silicon
The weight ratio in source, absolute ethyl alcohol and deionized water is 1:3.8:6.4, composite coupler is then added, composite coupler is by one kind
The aminomethyl phenyl of silane coupler containing benzene radicals dimethoxysilane, a kind of straight chained alkyl that contains roll into a ball silane coupler n-propyl front three
TMOS and a kind of silane coupler containing epoxide group 3- (2,3- the third oxygen of epoxy) propyl trimethoxy silicane are constituted, Yi Zhonghan
Benzene radicals silane coupler, a kind of straight chained alkyl that contains roll into a ball silane coupler and a kind of addition of silane coupler containing epoxide group
It is 0.3 times of silica molal quantity in silicon source, stirs；
(3) solution for obtaining step (2) is quickly poured into the mixed liquor that step (1) is obtained, and solution PH is controlled 4, is stirred
Mix a few hours；
(4) container is sealed and placed, be aged 2h；
(5) by the gel suction filtration after surface is modified and solvent is replaced, wash, stood under normal temperature；
(6) clean gel is dried, then carries out air flow super, obtain finished product.
Embodiment 4
A kind of preparation method for the VOC hydrophobic silicas adsorbed, the preparation method comprises the following steps：
(1) nitric acid, deionized water and absolute ethyl alcohol are made into mixed liquor in conical flask, stir 3min；
(2) silica source waterglass, absolute ethyl alcohol and deionized water are made into mixed liquor, silica source, nothing
The weight ratio of water-ethanol and deionized water is 1:4.0:6.7, composite coupler is then added, composite coupler contains phenyl ring by one kind
Group silane coupling agent phenyl triethoxysilane, a kind of straight chained alkyl that contains roll into a ball silane coupling agent vinyl front three oxosilane and one
Plant silane coupler containing epoxide group 3- (2,3- the third oxygen of epoxy) propyl-triethoxysilicane to constitute, a kind of silane containing benzene radicals
Coupling agent, a kind of straight chained alkyl group's silane coupler and a kind of addition of silane coupler containing epoxide group of containing are two in silicon source
0.5 times of silica molal quantity, stirs；
(3) solution for obtaining step (2) is quickly poured into the mixed liquor that step (1) is obtained, and solution PH is controlled 5, is stirred
Mix a few hours；
(4) container is sealed and placed, be aged 2h；
(5) by the gel suction filtration after surface is modified and solvent is replaced, wash, stood under normal temperature；
(6) clean gel is dried, then carries out air flow super, obtain finished product.
Embodiment 5
A kind of preparation method for the VOC hydrophobic silicas adsorbed, the preparation method comprises the following steps：
(1) nitric acid, deionized water and absolute ethyl alcohol are made into mixed liquor in conical flask, stir 3min；
(2) silica source waterglass, absolute ethyl alcohol and deionized water are made into mixed liquor, silica source, nothing
The weight ratio of water-ethanol and deionized water is 1:4.5:7.0, composite coupler is then added, composite coupler contains phenyl ring by one kind
Group silane coupling agent phenyltrimethoxysila,e, a kind of straight chained alkyl that contains roll into a ball silane coupler N- (2- aminoethyl -3- ammonia third
Base) methyl dimethoxysilane and a kind of silane coupler containing epoxide group 2- (3,4- epoxycyclohexyl) ethyl triethoxy silicane
Alkane is constituted, and a kind of silane coupler containing benzene radicals, a kind of straight chained alkyl that contains roll into a ball silane coupler and a kind of silicon containing epoxide group
Alkane coupling agent addition is 1 times of silica molal quantity in silicon source, is stirred；
(3) solution for obtaining step (2) is quickly poured into the mixed liquor that step (1) is obtained, and solution PH is controlled 6, is stirred
Mix a few hours；
(4) container is sealed and placed, be aged 2h；
(5) by the gel suction filtration after surface is modified and solvent is replaced, wash, stood under normal temperature；
(6) clean gel is dried, then carries out air flow super, obtain finished product.
Claims (10)
1. a kind of preparation method for the VOC hydrophobic silicas adsorbed, it is characterised in that the preparation method includes following step
Suddenly：
(1) nitric acid, deionized water and absolute ethyl alcohol are made into mixed liquor in a reservoir；
(2) silica source, absolute ethyl alcohol and deionized water are made into mixed liquor, then add composite coupler, stirring is equal
It is even；
(3) solution for obtaining step (2) is quickly poured into the mixed liquor that step (1) is obtained, and solution PH is controlled between 2 and 6,
Stir a few hours；
(4) container is sealed and placed, be aged 2h；
(5) by the gel suction filtration after surface is modified and solvent is replaced, wash, stood under normal temperature；
(6) clean gel is dried, then carries out air flow super, obtain finished product.
2. a kind of preparation method for the VOC hydrophobic silicas adsorbed according to claim 1, it is characterised in that
Silica source described in the step (2) uses tetraethyl orthosilicate or waterglass.
3. a kind of preparation method for the VOC hydrophobic silicas adsorbed according to claim 1, it is characterised in that
The weight ratio of silica source, absolute ethyl alcohol and deionized water is 1 in the step (2):
(3.0-4.5):(6.0-7.0)。
4. a kind of preparation method for the VOC hydrophobic silicas adsorbed according to claim 3, it is characterised in that
The weight ratio of silica source, absolute ethyl alcohol and deionized water is 1 in the step (2):3.8:6.4.
5. a kind of preparation method for the VOC hydrophobic silicas adsorbed according to claim 1, it is characterised in that
Composite coupler rolls into a ball silane coupler by a kind of silane coupler containing benzene radicals, a kind of straight chained alkyl that contains in the step (2)
Constituted with a kind of silane coupler containing epoxide group.
6. a kind of preparation method for the VOC hydrophobic silicas adsorbed according to claim 5, it is characterised in that
Silane coupler containing benzene radicals is phenyltrimethoxysila,e, dimethoxydiphenylsilane, methylbenzene in the step (2)
Base dimethoxysilane or phenyl triethoxysilane.
7. a kind of preparation method for the VOC hydrophobic silicas adsorbed according to claim 5, it is characterised in that
In the step (2) containing straight chained alkyl group silane coupler be n-octytriethoxysilane, dodecyltrimethoxysilane,
N-propyl trimethoxy silane, MTMS, vinyl front three oxosilane, VTES, 3- ammonia
Propyl-triethoxysilicane, N- (2- aminoethyl -3- aminopropyls) methyl dimethoxysilanes or N- (2- aminoethyl -3- ammonia third
Base) trimethoxy silane.
8. a kind of preparation method for the VOC hydrophobic silicas adsorbed according to claim 5, it is characterised in that
Silane coupler containing epoxide group is 2- (3,4- epoxycyclohexyl) ethyl triethoxysilane, 2- (3,4- in the step (2)
Epoxycyclohexyl) ethyl trimethoxy silane, 3- (2,3- the third oxygen of epoxy) propyl trimethoxy silicanes or 3- (2,3- epoxies third
Oxygen) propyl-triethoxysilicane.
9. a kind of preparation method for the VOC hydrophobic silicas adsorbed according to claim 5, it is characterised in that
A kind of silane coupler containing benzene radicals, one kind roll into a ball silane coupler containing straight chained alkyl in the step (2) and one kind contains epoxy
Group silane coupling agent addition is 0.05-1 times of silica molal quantity in silicon source.
10. a kind of preparation method for the VOC hydrophobic silicas adsorbed according to claim 9, it is characterised in that
A kind of silane coupler containing benzene radicals, one kind roll into a ball silane coupler containing straight chained alkyl in the step (2) and one kind contains epoxy
Group silane coupling agent addition is 0.3-0.5 times of silica molal quantity in silicon source.
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| CN108101066A (en) * | 2017-11-23 | 2018-06-01 | 浙江大学 | A kind of preparation method and applications of the spherical ordered multi-stage porous silica adsorbent of hydrophobicity |
| CN109437211A (en) * | 2018-11-14 | 2019-03-08 | 广州市飞雪材料科技有限公司 | A kind of high-specific surface area and high absorption VOC type silica and preparation method thereof |
| CN111389355A (en) * | 2020-03-23 | 2020-07-10 | 福建滤冠新型材料科技有限公司 | Graphene nano carbon fiber composite water purification material and preparation method thereof |
| CN111777873A (en) * | 2019-04-04 | 2020-10-16 | 深圳先进技术研究院 | Surface modification method of nano silicon dioxide |
| CN114702839A (en) * | 2022-03-31 | 2022-07-05 | 安徽江淮汽车集团股份有限公司 | Preparation method of polyolefin VOC (volatile organic compound) improved filler and composite material containing polyolefin VOC improved filler |
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| CN109437211A (en) * | 2018-11-14 | 2019-03-08 | 广州市飞雪材料科技有限公司 | A kind of high-specific surface area and high absorption VOC type silica and preparation method thereof |
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| WO2020098273A1 (en) * | 2018-11-14 | 2020-05-22 | 广州市飞雪材料科技有限公司 | High-specific-surface-area high-voc-adsorption silicon dioxide and preparation method therefor |
| CN111777873A (en) * | 2019-04-04 | 2020-10-16 | 深圳先进技术研究院 | Surface modification method of nano silicon dioxide |
| CN111389355A (en) * | 2020-03-23 | 2020-07-10 | 福建滤冠新型材料科技有限公司 | Graphene nano carbon fiber composite water purification material and preparation method thereof |
| CN114702839A (en) * | 2022-03-31 | 2022-07-05 | 安徽江淮汽车集团股份有限公司 | Preparation method of polyolefin VOC (volatile organic compound) improved filler and composite material containing polyolefin VOC improved filler |
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Application publication date: 20170905 |