CN108129865A - Straw biomass container and preparation method thereof - Google Patents
Straw biomass container and preparation method thereof Download PDFInfo
- Publication number
- CN108129865A CN108129865A CN201711407894.6A CN201711407894A CN108129865A CN 108129865 A CN108129865 A CN 108129865A CN 201711407894 A CN201711407894 A CN 201711407894A CN 108129865 A CN108129865 A CN 108129865A
- Authority
- CN
- China
- Prior art keywords
- preparation
- adhesive
- straw
- stalk
- moisture content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/46—Applications of disintegrable, dissolvable or edible materials
- B65D65/466—Bio- or photodegradable packaging materials
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/36—Explosive disintegration by sudden pressure reduction
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention discloses a kind of preparation methods of straw biomass container, include the following steps：Stalk is taken to be stirred with water, adjusts moisture content to 40 60%；8 14h are placed in hermetic bag；Steam blasting, obtains stalk fibre, and drying to moisture content is 5 15%；Add adhesive, mixing；With over dry restatement, the ratio of the stalk fibre and the adhesive is 10：(1~3)；The adhesive is polyvinyl alcohol；It is hot-forming；Cooling and shaping.The preparation method of biomass container of the present invention is the complete process mode of globality, have the characteristics that environmental-friendly, low energy consumption, simple to operation, it is suitble to promote, the straw biomass container formation that is prepared is good, mechanical property is good, weight bearing power is strong, and post-forming process can be still realized after environment-friendly degradable, curing.
Description
Technical field
The invention belongs to vessel fabrication field, more particularly to a kind of straw biomass container and preparation method thereof.
Background technology
According to the statistical data of National Development and Reform Commission, the Ministry of Agriculture, national Primary Crop Straw theoretical resources amount in 2015
It it is 10.4 hundred million tons, it is 9.0 hundred million tons to collect stock number.As a kind of abundant biomass resource, do not had not only at present
The utilization of effect, and bring a series of problem of environmental pollution.
All the time, country pays much attention to the comprehensive utilization of agricultural crop straw, although the synthesization utilization of stalk achieves
Certain effect, but the utilization power of the stalk resource in China is also in the initial development stage in general, at present still with stalk
Utilization still with " stalk fertilizer " i.e. based on straw-returning, not by the advantage of stalk resource maximization bring into play.
The Land use systems of stalk have very much, wherein for the manufacture of biomass container being a kind of effective utilization side by stalk
Formula.The biolobic material container is a kind of environment-friendly products, and pollution problem will not be brought in its production process, after use can be with
It degrades in nature biotechnology, problem of environmental pollution will not be brought.Further, since the rich and lower-cost spy of stalk resource
Point, the biomass container with its production is a kind of product with the market competitiveness, has vast potential for future development.
But since the plasticity of stalk in itself is poor, and mechanical crushing can not be effectively improved the surface characteristic of straw, directly
The mouldability of hot-forming all kinds of stalk products is poor in mold, mechanical strength is weaker.
It needs to handle or process using a large amount of chemicals in the preparation process of existing all kinds of stalk products
Step complicated and time consumption or former subsidiary materials cost is higher or adhesive biological degradability is insufficient, it is above-mentioned a series of
Problem, causes that biomass container mechanical property is bad, energy consumption is big, production cost is higher, can not efficiently and effectively realize that environment is protected
Shield, is unfavorable for being widely applied.
Therefore, it is necessary to find a kind of method of environment-friendly high-efficiency prepares environmentally friendly straw biomass container to realize.
Invention content
Based on this, in view of the above-mentioned problems, the present invention provides a kind of environmentally friendly straw biomass container and its systems
Preparation Method.
Specific technical solution is as follows：
A kind of preparation method of straw biomass container, includes the following steps：
(1) rice straw is taken to be stirred with water, adjusts moisture content to 40-60%；
(2) 8-14h is placed in hermetic bag；
(3) steam blasting, obtains rice-straw fibre, and drying to moisture content is 5-20%；
(4) adhesive, mixing are added；With over dry restatement, the ratio of the rice-straw fibre and the adhesive is 10：(1~
3)；The adhesive is polyvinyl alcohol；
(5) it is hot-forming；
(6) cooling and shaping.
In wherein some embodiments, above-mentioned polyvinyl alcohol is powdery polyethylene alcohol, the powdery polyethylene alcohol
Grain size is 50-300 μm, alcoholysis degree 70-95%.
In wherein some embodiments, above-mentioned steam blasting uses screw steam blasting machine.
In wherein some embodiments, the blasting parameter of above-mentioned screw steam blasting machine is as follows：Temperature is 110-150
DEG C, pressure 0.5-2MPa.
In wherein some embodiments, the preparation method of above-mentioned straw biomass container includes the following steps：
(1) rice straw is taken to be stirred with water, adjusts moisture content to 50%；
(2) 12h is placed in hermetic bag；
(3) steam blasting, obtains rice-straw fibre, and drying to moisture content is 10%；
(4) adhesive, mixing are added；With over dry restatement, the ratio of the rice-straw fibre and the adhesive is 10：1.5；
The adhesive is polyvinyl alcohol；
(5) it is hot-forming；
(6) cooling and shaping.
In wherein some embodiments, above-mentioned drying is that, in being dried in baking oven, the drying temperature is not higher than 105
℃。
In wherein some embodiments, above-mentioned mixing is：Using high speed mixer, 2-15min is mixed.
It is above-mentioned hot-forming to be in wherein some embodiments：By the mixing of the rice-straw fibre and the polyvinyl alcohol
Object is placed in mold, after 1-5min is preheated on moulding press, under the conditions of 150-220 DEG C of temperature, pressure 5-20MPa, and hot pressing 1-
420s。
In wherein some embodiments, above-mentioned cooling and shaping is：Obtained container is removed from the molds, by naturally cold
But to get.
The present invention also aims to provide a kind of straw biomass container, specific technical solution is as follows：
A kind of straw biomass container is prepared by the preparation method of above-mentioned straw biomass container.
Based on above-mentioned technical proposal, the invention has the advantages that：
Inventor after adjusting moisture content of straws, passes through what is placed in hermetic bag by a large amount of creative works
Method causes inside moisture penetration to stalk, and moisture becomes vapor from stalk cell interior during steam blasting, so as to soften straw
Stalk cell improves steam blasting effect, and stalk fibre is obtained so as to be easily isolated fibre bundle；According to obtained stalk fibre,
Polyvinyl alcohol has been selected as adhesive, there is good compatibility, and thermoplasticity is good between the adhesive and the stalk fibre,
The adhesive with stalk fibre with certain proportion is mixed, hot pressing, prepared by the complete process mode in this way with globality
Obtained straw biomass container formation is good, mechanical property is good, weight bearing power is strong, and still can be real after environment-friendly degradable, curing
Existing post-forming process.
Polyvinyl alcohol below above-mentioned adhesive choice of powder shape, 300 μm of grain size, with stalk fibre can directly dry method mix
It closes, mixing efficiency is high and uniform, and eliminating traditional adhesive needs the link for dissolving, spraying, drying, and step is simple, efficient and energy
It consumes low.
Above-mentioned steam blasting uses screw steam blasting machine, can in moisture content of straws control in the case of 40-60%
It realizes not additional steam, by the extrusion shearing heat of screw rod, the water heating in material is become vapor, so as to fulfill steam
Energy consumption is further saved in explosion.
The utilization that the preparation method of straw biomass container of the present invention not only solves stalk biomass resource is asked
Topic, while during preparing rice-straw fibre herein, Water usage is small, and without using chemical reagent, there is no water pollutions and chemistry
Pollution problem has the characteristics that environmental-friendly, low energy consumption, simple to operation, is suitble to promote.
The straw biomass container formation that is prepared using the method for the invention is good, mechanical property is good, load energy
Power is strong, and raw material is environmentally friendly raw material, it can be achieved that biodegradation.
Description of the drawings
Fig. 1 is the process flow chart for preparing straw biomass container；
Fig. 2 is the male and female mold schematic diagram for preparing straw biomass container；
Fig. 3 is the straw biomass container that embodiment 1 is prepared.
Specific embodiment
In order to be more clearly understood that the technology contents of the present invention, spy lifts following embodiment and is described in detail.It should be understood that this
A little embodiments are only illustrative of the invention and is not intended to limit the scope of the invention.
Unless otherwise defined, technical field of all technical and scientific terms used in the present invention with belonging to the present invention
The normally understood meaning of technical staff it is identical.The term used in the description of the present invention is intended merely to describe specific reality
The purpose of example is applied, is not used in the limitation present invention.Term "and/or" used in the present invention includes one or more relevant listed
The arbitrary and all combination of project.
Embodiment 1-2, comparative example 1-5
Invention provides a kind of preparation method of straw biomass container, includes the following steps, each embodiment or comparison
The corresponding technological parameter of example is as shown in table 1, and technological process is as shown in Figure 1.
(1) conditioning：
The rice straw of natural air drying is taken, using chaffcutter rice straw cut for forage stalk to 1-3cm, weighs rice straw, is added in
The tap water of corrresponding quality, puts it into batch mixer and stirs, and the moisture content for adjusting rice straw is adjusted, and is placed in hermetic bag
Certain time length；
(2) steam blasting pre-processes：
The straw of conditioning is put into screw steam blasting machine and carries out steam blasting, after measured, blasting parameter
For 110-150 DEG C of temperature, pressure 0.5-2MPa obtains steam blasting rice-straw fibre, is put in drying in baking oven, and adjust
Moisture content.
(3) adhesive is added：
The above-mentioned steam blasting rice-straw fibre that 100 parts by weight are calculated as with oven dry weight is taken, adds in the powdered of 15 parts by weight
Polyvinyl alcohol (PVA), which is put in high speed mixer, mixes 10min；
(4) it is hot-forming：
Uniformly mixed stalk fibre and PVA are put in the cavity plate of male and female mold as shown in Figure 2, mold is put in molding
It is hot-forming after preheating 1-3min on machine, wherein, the taper of above-mentioned mold is 1:1.4, setting hot pressing temperature is 200 DEG C, pressure
For 12MPa, the hot-forming time is 1-420s；
In other embodiments, above-mentioned mold can carry out taper as needed or the adjustment of shape is replaced.
(5) cooling and shaping：
Obtained container is taken out after die sinking, by natural cooling, you can obtain straw biomass container.
Table 1
Wherein, the weight of above-mentioned rice straw is with OD wt. basis；In above-mentioned adjusting moisture content step, moisture content is by containing
Water rate analyzer measures, and chaffcutter, batch mixer, screw steam blasting machine, high speed mixer, baking oven, moulding press, moisture content are surveyed
It is commercially available commonly used equipment to determine instrument；Above-mentioned steam blasting is a kind of continuous type steam explosion, it can be achieved that industrialized production.
Processing step described in embodiment 1-2 and comparative example 1-5 is prepared straw biomass container simultaneously carries out performance
Detection, the results are shown in Table 2.
Wherein, the measure of Extreme Load Distributions (KN), reference《GBT 1041-1992 plastic compression method for testing performances》, to system
The biomass container obtained carries out compression experiment, is tested on electronic universal tester, the pressure head for testing use is flat-plate compressed
Head, load mode are Slow loadings.
Table 2
As seen from the results in Table 2, the preparation method described in comparative example 1, moisture content is excessively high in pre-treatment, and friction and Extrusion is caused to be imitated
Fruit is poor, and steam blasting effect reduces, and stalk fibre separation is incomplete, causes to reduce with the compatibility of PVA, finally be prepared
Straw biomass vessel surface smooth degree is slightly below embodiment 1-2, and weight bearing power is poor.
Preparation method described in comparative example 2, because not using steam blasting, stalk fibre separating effect is bad, while stalk
Surface causes there are the wax of high level with silica low with the compatibility of PVA, and mixing is uneven, finally it is prepared
Straw biomass vessel surface smooth degree less than embodiment 1-2, and weight bearing power is poor.
Preparation method described in comparative example 3 is not certain using the stalk after adjusting moisture content is placed in placement in hermetic bag
Duration, steam blasting effect is also poor, is not so good as embodiment 1-2 so as to cause appearance, weight bearing power.
Preparation method described in comparative example 4, after steam blasting, mixed with PVA before, drying be not enough, moisture content compared with
Height leads to hot-forming required time lengthening, and product surface can blister, and be cracked during pressure release after molding.
For comparative example 5 using starch as adhesive, thermoplasticity is poor, is not suitable for preparing container class special-shaped product.
And quick the time required to the preparation method hot pressing described in 1-2 of the embodiment of the present invention, reasonable, the stalk life being prepared
Material container appearance good forming effect, surfacing is beautiful, and has higher Extreme Load Distributions, and mechanical property is good, and load-carrying ability is strong,
The Utilizing question of stalk living resources is efficiently solved, while also there is biodegradable, environmental-friendly.Wherein,
The biomass container that embodiment 1 is prepared is as shown in Figure 3.
Embodiment described above only expresses the several embodiments of the present invention, and description is more specific and detailed, but simultaneously
Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of preparation method of straw biomass container, which is characterized in that include the following steps：
(1) stalk is taken to be stirred with water, adjusts moisture content to 40-60%；
(2) 8-14h is placed in hermetic bag；
(3) steam blasting, obtains stalk fibre, and drying to moisture content is 5-20%；
(4) adhesive, mixing are added；With over dry restatement, the ratio of the stalk fibre and the adhesive is 10：(1~3)；
The adhesive is polyvinyl alcohol；
(5) it is hot-forming；
(6) cooling and shaping.
2. preparation method according to claim 1, which is characterized in that step (4) described polyvinyl alcohol is powdered poly- second
Enol, the grain size of the powdery polyethylene alcohol is 50-300 μm, alcoholysis degree 70-95%.
3. preparation method according to claim 1, which is characterized in that the steam blasting uses screw steam blasting
Machine.
4. preparation method according to claim 3, which is characterized in that the blasting parameter of the screw steam blasting machine is such as
Under：Temperature is 110-150 DEG C, pressure 0.5-2MPa.
5. according to claim 1 any one of them preparation method, which is characterized in that include the following steps：
(1) rice straw is taken to be stirred with water, adjusts moisture content to 50%；
(2) 12h is placed in hermetic bag；
(3) steam blasting, obtains rice-straw fibre, and drying to moisture content is 10%；
(4) adhesive, mixing are added；With over dry restatement, the ratio of the stalk fibre and the adhesive is 10：1.5；It is described
Adhesive is polyvinyl alcohol；
(5) it is hot-forming；
(6) cooling and shaping.
6. according to claim 1-5 any one of them preparation methods, which is characterized in that step (3) described drying is：In baking oven
It is inside dried, the drying temperature is not higher than 105 DEG C.
7. according to claim 1-5 any one of them preparation methods, which is characterized in that step (4) described mixing is：Use height
Fast batch mixer mixes 2-15min.
8. according to claim 1-5 any one of them preparation methods, which is characterized in that step (5) is described hot-forming to be：It will
The mixture of the stalk fibre and the polyvinyl alcohol is placed in mold, after 1-5min is preheated on moulding press, in temperature
150-220 DEG C, under the conditions of pressure 5-20MPa, hot pressing 1-420s.
9. according to claim 1-5 any one of them preparation methods, which is characterized in that step (6) described cooling and shaping is：It will
Obtained container is removed from the molds, by natural cooling to get.
10. a kind of straw biomass container, which is characterized in that prepared by such as claim 1-9 any one of them preparation method
It obtains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711407894.6A CN108129865A (en) | 2017-12-22 | 2017-12-22 | Straw biomass container and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711407894.6A CN108129865A (en) | 2017-12-22 | 2017-12-22 | Straw biomass container and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108129865A true CN108129865A (en) | 2018-06-08 |
Family
ID=62391721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711407894.6A Pending CN108129865A (en) | 2017-12-22 | 2017-12-22 | Straw biomass container and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108129865A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106750553A (en) * | 2017-03-02 | 2017-05-31 | 华南理工大学 | Biodegradable composite and its preparation method and application |
| CN108849071A (en) * | 2018-09-21 | 2018-11-23 | 安徽省农业科学院农业工程研究所 | Straw seedling breeding pot manufactures particular manufacturing craft |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104403134A (en) * | 2014-12-31 | 2015-03-11 | 桂林理工大学 | Preparation method of bio-based composite material |
| CN105856379A (en) * | 2016-04-14 | 2016-08-17 | 华南理工大学 | Environment-friendly high-strength lignocellulose plate and preparing method thereof |
| CN105949807A (en) * | 2016-06-13 | 2016-09-21 | 华南理工大学 | Polyvinyl alcohol-based wood-plastic composite and melting processing method thereof |
-
2017
- 2017-12-22 CN CN201711407894.6A patent/CN108129865A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104403134A (en) * | 2014-12-31 | 2015-03-11 | 桂林理工大学 | Preparation method of bio-based composite material |
| CN105856379A (en) * | 2016-04-14 | 2016-08-17 | 华南理工大学 | Environment-friendly high-strength lignocellulose plate and preparing method thereof |
| CN105949807A (en) * | 2016-06-13 | 2016-09-21 | 华南理工大学 | Polyvinyl alcohol-based wood-plastic composite and melting processing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 蓝骏山: ""水溶型粘结剂增强桉木闪爆纤维板材性能及结合机理"", 《中国优秀硕士学位论文全文数据库工程科技I辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106750553A (en) * | 2017-03-02 | 2017-05-31 | 华南理工大学 | Biodegradable composite and its preparation method and application |
| CN108849071A (en) * | 2018-09-21 | 2018-11-23 | 安徽省农业科学院农业工程研究所 | Straw seedling breeding pot manufactures particular manufacturing craft |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102702704B (en) | Degradable polylactic acid (PLA) composite material and preparation method thereof | |
| CN102051002B (en) | Zymolytic lignin-wood fiber-polyolefin hybrid composite material and preparation method thereof | |
| CN103333514B (en) | Degradable reinforced plant fiber material and preparation method thereof | |
| CN104804331B (en) | The reuse method of FRP garbage, PVC base wood-plastic composite material and preparation method thereof | |
| CN103214694A (en) | Ramie core powder degradable tableware and manufacturing method thereof | |
| CN106189326B (en) | Furfural dregs are preparing the application in Wood-plastic material | |
| CN112663402A (en) | Preparation system of polymerized product based on plant fiber mould pressing | |
| CN104403134A (en) | Preparation method of bio-based composite material | |
| CN106396718A (en) | Preparation method of sludge shale porous brick | |
| CN108129865A (en) | Straw biomass container and preparation method thereof | |
| CN103554949B (en) | A kind of table ware made of stalk and production method thereof | |
| CN104194287A (en) | Modified poly-adipic acid/butylene terephthalate composite material containing coconut shell flour and preparation method thereof | |
| CN104499380A (en) | Method for producing seedling breeding container from fibrous solid wastes | |
| CN107363961A (en) | A kind of artificial board of straw and preparation method thereof | |
| CN105856379A (en) | Environment-friendly high-strength lignocellulose plate and preparing method thereof | |
| CN107383913A (en) | The method that Wood-plastic material is prepared using bean dregs | |
| CN101805525A (en) | Water absorption master batch for wood-plastic composite material and product and production method thereof | |
| CN103992592B (en) | Secondary stock Wood-plastic material and preparation method thereof | |
| CN104327461B (en) | Utilize the method that waste printed circuit board powder-granule material produces high density environment-friendly sheet | |
| CN102731878A (en) | Environment-friendly stone paper and preparation method thereof | |
| CN108821287A (en) | A kind of preparation and its application of biomass-based powdered carbon binder | |
| CN102443269A (en) | Radiation modified soybean isolated protein/starch plastic and preparation method thereof | |
| CN108124727B (en) | Lac waste residue culture medium for soilless culture and preparation method thereof | |
| CN110256792A (en) | A kind of greening waste fiber foam buffering package technique | |
| CN105001508A (en) | Method for preparing polyvinyl wood-plastic composite materials by means of walnut shell powder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180608 |
|
| RJ01 | Rejection of invention patent application after publication |