CN108049191A - A kind of preparation method of automobile cushion microcapsule aromatic type coconut husk composite material - Google Patents
A kind of preparation method of automobile cushion microcapsule aromatic type coconut husk composite material Download PDFInfo
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- CN108049191A CN108049191A CN201711320750.7A CN201711320750A CN108049191A CN 108049191 A CN108049191 A CN 108049191A CN 201711320750 A CN201711320750 A CN 201711320750A CN 108049191 A CN108049191 A CN 108049191A
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- composite material
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M23/00—Treatment of fibres, threads, yarns, fabrics or fibrous goods made from such materials, characterised by the process
- D06M23/12—Processes in which the treating agent is incorporated in microcapsules
-
- 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
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/005—Compositions containing perfumes; Compositions containing deodorants
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/184—Carboxylic acids; Anhydrides, halides or salts thereof
- D06M13/207—Substituted carboxylic acids, e.g. by hydroxy or keto groups; Anhydrides, halides or salts thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/39—Aldehyde resins; Ketone resins; Polyacetals
- D06M15/423—Amino-aldehyde resins
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/32—Polyesters
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Abstract
A kind of automobile cushion preparation method of microcapsule aromatic type coconut husk composite material, belongs to automotive trim processing technique field, comprises the following steps：Coir fibre pretreatment, prepare coir fibre/lactic acid composite material, individual layer wall building, double-deck wall building, prepare microscapsule powder, prepare microcapsule aromatic finishing agent, microcapsule aromatic arranges.Microcapsules prepared by the present invention, surface is smooth, and cyst wall densification does not rupture, structural integrity, measures its highest oil content and reaches 40% or so.Microcapsules appearance is more regular, and homogeneity, favorable dispersibility.Lemon is wrapped in microcapsules, and the average grain diameter of microcapsules is 2.6um or so, has good thermal stability.Using lemon extract as core, melamine resin is wall material, suitable emulsifier, core and wall material ratio, temperature of reaction system and pH value, mixing speed and rational control time are selected, obtains that grain size is smaller and hard-packed microcapsules, and the rate of microcapsules release lemon extract is slow.
Description
Technical field
The invention belongs to automotive trim processing technique fields, and in particular to a kind of automobile cushion microcapsule aromatic type coconut husk
The preparation method of composite material.
Background technology
In today of scientific and technological high speed development, more and more people advocate nature, brief, healthy lifestyles, consumer
Impression to automobile inner decoration facing, except through vision and tactile outside, can also various fabrics be snuffed by smell one and given out
Fragrance, oneself favorite textile is selected with this.The quietly rise of various fragrant fabrics and flourish not only complied with this
One trend meets human wants, also assigns textile new intension.With the development of economy and living standard carries
It is high.Requirement of the people to textile has changed a lot, from it is past it is practical to decoration, enjoy, health conversion, spin
Fabric flavoring has complied with this trend.Since fragrant textile has the effects that antibacterial expelling parasite, covering smell, makes body and mind comfortable,
Thus generally liking for people is obtained.
Newest fragrance is learned and is applied to spinning to the achievement in research of humanistic psychology with aromatotherapy by the research of fragrant fabric
Fabric belongs to the textile of high-tech, high added value.It can not only make client's shower spring breeze, it is relaxing, and can bring
User treats and health care effectiveness.With the development of science and technology, economic prosperity, the raising of the level of consumption, fragrance in the near future
Textile will be as the fashion trend of International Textile.Due to the restriction of technology and cost, China opens fragrant fabric at present
Hair and application are less, and especially application of the fragrant fabric in terms of automotive trim is even more fewer and fewer.The research to this is increased, is caused
Power must can greatly improve the competitive strength of China's automobile textiles in the world in the development for promoting Microencapsulated Slow technology.
The content of the invention
In order to solve the problems in the existing technology, the present invention provides a kind of automobiles with excellent slow release effect
The preparation method of cushion microcapsule aromatic type coconut husk composite material.
The present invention uses following technical scheme：
A kind of automobile cushion preparation method of microcapsule aromatic type coconut husk composite material, comprises the following steps：
Step 1：Coir fibre is placed in the NaOH solution of mass fraction 2% and impregnates 48h, with distillation washing after taking-up
It washs to neutrality, is put into baking oven in 110 DEG C of drying, by the activator (NH of the coir fibre after alkali process4)2HPO4Impregnate 12h,
It is put into after taking-up in baking oven in 110 DEG C of drying, the sample of drying is placed in Muffle furnace and is carried out in temperature at pre-oxidation for 180 DEG C
Reason, time 1.5h, the sample for then crossing pre-oxidation treatment, which is put into tube furnace, to be carbonized, and carbonization temperature is 700 DEG C, when
Between for 80min, finally by product volume ratio 1:9 HCl solution impregnates 1h, then product is washed till neutrality with deionized water, puts
Enter spare in 110 DEG C of dry 12h in baking oven；
Step 2：Polylactic acid, coir fibre in mass ratio 75/15 is added in mixer and carries out melt blending, is blended
180 DEG C, rotating speed 40r/min of temperature, after being kneaded 5min, by blends described above hot pressing on compression molding instrument, molding temperature 200
DEG C, pressure 15MPa obtains coir fibre/lactic acid composite material；
Step 3：10g lemon extracts, 22g emulsifiers and 150g distilled water are mixed evenly at a temperature of 40 DEG C,
Mixing speed is 900r/min, is poured into after stirring 3h in container, adjusts pH value to 4-5, and container is put into 40 DEG C of constant temperature water baths,
10g melamine resins are added dropwise under agitation, are warming up to 65 DEG C, keep the temperature 1.5h, carry out individual layer wall building；
Step 4：After individual layer wall building postcooling to room temperature, 10g melamine resins are added dropwise again under agitation, are warming up to
75 DEG C, 2h is kept the temperature, carries out double-deck wall building；
Step 5：PH value is adjusted after double-deck wall building to 9,20g urea is added in into container and removes free formaldehyde, vacuum is taken out
Filter is washed 3 times, then the essence on surface is washed away with ethyl alcohol, and drying obtains microscapsule powder；
Step 6：Microcapsule aromatic finishing agent is configured by following mass fraction：Microscapsule powder 5%, unsaturated polyurethanes
Aqueous dispersion 20%, photoinitiator 2%, thickener 1%, crosslinking agent 5%, surplus are water；
Step 7：Method, bath raio 1 are rolled using two leachings two:20, by coir fibre/lactic acid composite material in microcapsule aromatic
1h is impregnated in finishing agent, it is made fully to infiltrate, then with padding machine pressure rolling, pick-up 70%-80%, two leachings two are rolled, pre- in 90 DEG C
90s is dried, 40s is baked at 160 DEG C with dryer, is respectively washed once through hot water, cold water, finally by its naturally dry, then at 1000W high
It is pressed with ultraviolet curing 4min under the mercury lamp of pole, the distance of light source and composite material is fixed as 5cm.
Preferably, the emulsifier is polydimethyl diallyl ammonium chloride-acrylamide.
Preferably, the photoinitiator is benzophenone.
Preferably, the thickener is polyurethane thickener.
Preferably, the crosslinking agent is citric acid.
The beneficial effects of the present invention are：
1) polylactic acid has good degradability and good biocompatibility, possesses relatively good mechanical strength.Using
Cheap coir fibre serves as the filler of system, is greatly improved its utilization rate, so as to reduce due to failing to deal carefully with
Put the harm that material generates the Nature aside as useless.Coir fibre/lactic acid composite material is as a kind of environment friendly material, green
It is pollution-free, there is considerable development prospect, there is highly important environment protection significance, while energy-saving and emission-reduction are advantageous to, and coconut palm
Case fibre has good flame retardant effect.
2) microcapsules prepared under the process conditions of the present invention, surface is smooth, and cyst wall densification does not rupture, and structure is complete
It is whole, its oil content is measured, highest oil content reaches 40% or so.
3) the microcapsules appearance that prepared by the present invention is more regular, and homogeneity, favorable dispersibility.Lemon is wrapped in
In microcapsules, the uniformity that the test of the grain size of laser particle analyzer shows microcapsules is preferable, and average grain diameter is 2.6um or so, tool
There is good thermal stability.
4) using lemon extract as core, melamine resin is wall material, select suitable emulsifier, core and wall material ratio,
Temperature of reaction system and pH value, mixing speed and rational control time, obtain that grain size is smaller and hard-packed microcapsules, micro-
The rate of capsule release lemon extract is slow, has excellent slow release effect, and giving out citris aromas has good eliminate the unusual smell
Effect.
5) fixation of microcapsules under cryogenic can be realized by UV curing adhesive agent.
Specific embodiment
With reference to embodiments, the technical solution in the present invention is clearly and completely described.Based in the present invention
Embodiment, those of ordinary skill in the art's all other embodiments obtained without making creative work, all
Belong to the scope of protection of the invention.
A kind of automobile cushion preparation method of microcapsule aromatic type coconut husk composite material, comprises the following steps：
Step 1：Coir fibre is placed in the NaOH solution of mass fraction 2% and impregnates 48h, with distillation washing after taking-up
It washs to neutrality, is put into baking oven in 110 DEG C of drying, by the activator (NH of the coir fibre after alkali process4)2HPO4Impregnate 12h,
It is put into after taking-up in baking oven in 110 DEG C of drying, the sample of drying is placed in Muffle furnace and is carried out in temperature at pre-oxidation for 180 DEG C
Reason, time 1.5h, the sample for then crossing pre-oxidation treatment, which is put into tube furnace, to be carbonized, and carbonization temperature is 700 DEG C, when
Between for 80min, finally by product volume ratio 1:9 HCl solution impregnates 1h, then product is washed till neutrality with deionized water, puts
Enter spare in 110 DEG C of dry 12h in baking oven；
Step 2：Polylactic acid, coir fibre in mass ratio 75/15 is added in mixer and carries out melt blending, is blended
180 DEG C, rotating speed 40r/min of temperature, after being kneaded 5min, by blends described above hot pressing on compression molding instrument, molding temperature 200
DEG C, pressure 15MPa obtains coir fibre/lactic acid composite material；
Step 3：10g lemon extracts, 22g emulsifiers and 150g distilled water are mixed evenly at a temperature of 40 DEG C,
Mixing speed is 900r/min, is poured into after stirring 3h in container, adjusts pH value to 4-5, and container is put into 40 DEG C of constant temperature water baths,
10g melamine resins are added dropwise under agitation, are warming up to 65 DEG C, keep the temperature 1.5h, carry out individual layer wall building；
Step 4：After individual layer wall building postcooling to room temperature, 10g melamine resins are added dropwise again under agitation, are warming up to
75 DEG C, 2h is kept the temperature, carries out double-deck wall building；
Step 5：PH value is adjusted after double-deck wall building to 9,20g urea is added in into container and removes free formaldehyde, vacuum is taken out
Filter is washed 3 times, then the essence on surface is washed away with ethyl alcohol, and drying obtains microscapsule powder；
Step 6：Microcapsule aromatic finishing agent is configured by following mass fraction：Microscapsule powder 5%, unsaturated polyurethanes
Aqueous dispersion 20%, photoinitiator 2%, thickener 1%, crosslinking agent 5%, surplus are water；
Step 7：Method, bath raio 1 are rolled using two leachings two:20, by coir fibre/lactic acid composite material in microcapsule aromatic
1h is impregnated in finishing agent, it is made fully to infiltrate, then with padding machine pressure rolling, pick-up 70%-80%, two leachings two are rolled, pre- in 90 DEG C
90s is dried, 40s is baked at 160 DEG C with dryer, is respectively washed once through hot water, cold water, finally by its naturally dry, then at 1000W high
It is pressed with ultraviolet curing 4min under the mercury lamp of pole, the distance of light source and composite material is fixed as 5cm.
The emulsifier is polydimethyl diallyl ammonium chloride-acrylamide.
The photoinitiator is benzophenone.
The thickener is polyurethane thickener.
The crosslinking agent is citric acid.
The present invention is exemplarily described above, it is clear that present invention specific implementation is not subject to the restrictions described above,
As long as it employs the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress or not improved sends out this
Bright design and technical solution directly applies to other occasions, within protection scope of the present invention.The protection of the present invention
Scope should be determined by the scope of protection defined in the claims.
Claims (5)
1. a kind of automobile cushion preparation method of microcapsule aromatic type coconut husk composite material, which is characterized in that including following step
Suddenly：
Step 1：Coir fibre is placed in the NaOH solution of mass fraction 2% and impregnates 48h, is washed with distilled water to after taking-up
Neutrality is put into baking oven in 110 DEG C of drying, by the activator (NH of the coir fibre after alkali process4)2HPO412h is impregnated, is taken out
After be put into baking oven in 110 DEG C of drying, the sample of drying is placed in Muffle furnace in 180 DEG C of temperature progress pre-oxidation treatments, when
Between for 1.5h, the sample for then crossing pre-oxidation treatment, which is put into tube furnace, to be carbonized, and carbonization temperature is 700 DEG C, and the time is
80min, finally by product volume ratio 1:9 HCl solution impregnates 1h, then product is washed till neutrality with deionized water, is put into baking
It is spare in 110 DEG C of dry 12h in case；
Step 2：Polylactic acid, coir fibre in mass ratio 75/15 is added in mixer and carries out melt blending, blending temperature
180 DEG C, rotating speed 40r/min, after being kneaded 5min, by blends described above hot pressing on compression molding instrument, 200 DEG C of molding temperature, pressure
Power 15MPa obtains coir fibre/lactic acid composite material；
Step 3：10g lemon extracts, 22g emulsifiers and 150g distilled water at a temperature of 40 DEG C are mixed evenly, stirred
Speed is 900r/min, is poured into after stirring 3h in container, adjusts pH value to 4-5, container is put into 40 DEG C of constant temperature water baths, is being stirred
10g melamine resins are added dropwise under the conditions of mixing, are warming up to 65 DEG C, keep the temperature 1.5h, carry out individual layer wall building；
Step 4：After individual layer wall building postcooling to room temperatures, 10g melamine resins are added dropwise again under agitation, are warming up to 75 DEG C,
2h is kept the temperature, carries out double-deck wall building；
Step 5：PH value is adjusted after double-deck wall building to 9,20g urea is added in into container and removes free formaldehyde, vacuum filtration, water
It washes 3 times, then the essence on surface is washed away with ethyl alcohol, dry, obtain microscapsule powder；
Step 6：Microcapsule aromatic finishing agent is configured by following mass fraction：Microscapsule powder 5%, unsaturated polyurethanes moisture
Granular media 20%, photoinitiator 2%, thickener 1%, crosslinking agent 5%, surplus are water；
Step 7：Method, bath raio 1 are rolled using two leachings two:20, coir fibre/lactic acid composite material is arranged in microcapsule aromatic
1h is impregnated in agent, it is made fully to infiltrate, then with padding machine pressure rolling, pick-up 70%-80%, two leachings two are rolled, in 90 DEG C of preliminary dryings
90s bakes 40s at 160 DEG C with dryer, is respectively washed once through hot water, cold water, finally by its naturally dry, then at 1000W high pressures
There is a ultraviolet curing 4min under the mercury lamp of pole, the distance of light source and composite material is fixed as 5cm.
2. a kind of automobile cushion according to claim 1 preparation method of microcapsule aromatic type coconut husk composite material,
It is characterized in that：The emulsifier is polydimethyl diallyl ammonium chloride-acrylamide.
3. a kind of automobile cushion according to claim 1 preparation method of microcapsule aromatic type coconut husk composite material,
It is characterized in that：The photoinitiator is benzophenone.
4. a kind of automobile cushion according to claim 1 preparation method of microcapsule aromatic type coconut husk composite material,
It is characterized in that：The thickener is polyurethane thickener.
5. a kind of automobile cushion according to claim 1 preparation method of microcapsule aromatic type coconut husk composite material,
It is characterized in that：The crosslinking agent is citric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711320750.7A CN108049191A (en) | 2017-12-12 | 2017-12-12 | A kind of preparation method of automobile cushion microcapsule aromatic type coconut husk composite material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711320750.7A CN108049191A (en) | 2017-12-12 | 2017-12-12 | A kind of preparation method of automobile cushion microcapsule aromatic type coconut husk composite material |
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| CN108049191A true CN108049191A (en) | 2018-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711320750.7A Withdrawn CN108049191A (en) | 2017-12-12 | 2017-12-12 | A kind of preparation method of automobile cushion microcapsule aromatic type coconut husk composite material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112873471A (en) * | 2021-01-19 | 2021-06-01 | 上海海事大学 | Coconut shell fiber insulation board and preparation method thereof |
| CN113730376A (en) * | 2021-09-17 | 2021-12-03 | 华中药业股份有限公司 | Thiamine nitrate sustained-release microcapsule and preparation method thereof |
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| CN102127864B (en) * | 2010-12-24 | 2012-07-04 | 天津市双马香精香料新技术有限公司 | Preparation method and application of aromatic microcapsule finishing agent with double-layer wall materials |
| CN103073860A (en) * | 2011-10-26 | 2013-05-01 | 延锋伟世通汽车饰件***有限公司 | Environment-friendly composite material used in automotive decorative parts, and construction method thereof |
| CN107119459A (en) * | 2017-04-12 | 2017-09-01 | 三元控股集团有限公司 | A kind of chemical plating front activating method based on photocuring technology |
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2017
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102127864B (en) * | 2010-12-24 | 2012-07-04 | 天津市双马香精香料新技术有限公司 | Preparation method and application of aromatic microcapsule finishing agent with double-layer wall materials |
| CN103073860A (en) * | 2011-10-26 | 2013-05-01 | 延锋伟世通汽车饰件***有限公司 | Environment-friendly composite material used in automotive decorative parts, and construction method thereof |
| CN107119459A (en) * | 2017-04-12 | 2017-09-01 | 三元控股集团有限公司 | A kind of chemical plating front activating method based on photocuring technology |
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| 杨舒宇等: "PLA/椰壳纤维阻燃复合材料的制备与性能研究", 《塑料科技》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112873471A (en) * | 2021-01-19 | 2021-06-01 | 上海海事大学 | Coconut shell fiber insulation board and preparation method thereof |
| CN113730376A (en) * | 2021-09-17 | 2021-12-03 | 华中药业股份有限公司 | Thiamine nitrate sustained-release microcapsule and preparation method thereof |
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Application publication date: 20180518 |
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