CN107722230A - A kind of inorganic filler modified polyurethane foam material and preparation method thereof - Google Patents
A kind of inorganic filler modified polyurethane foam material and preparation method thereof Download PDFInfo
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- CN107722230A CN107722230A CN201710957354.9A CN201710957354A CN107722230A CN 107722230 A CN107722230 A CN 107722230A CN 201710957354 A CN201710957354 A CN 201710957354A CN 107722230 A CN107722230 A CN 107722230A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/08—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7614—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2110/00—Foam properties
- C08G2110/0041—Foam properties having specified density
- C08G2110/005—< 50kg/m3
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2110/00—Foam properties
- C08G2110/0083—Foam properties prepared using water as the sole blowing agent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/10—Water or water-releasing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2205/00—Foams characterised by their properties
- C08J2205/04—Foams characterised by their properties characterised by the foam pores
- C08J2205/05—Open cells, i.e. more than 50% of the pores are open
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
- C08J2375/08—Polyurethanes from polyethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The present invention provides a kind of inorganic filler modified polyurethane foam material and preparation method thereof, belongs to polymeric foamed material field.The preparing raw material of inorganic filler modified polyurethane foam material of the present invention includes：Polyalcohol, deionized water, catalyst, surfactant, inorganic particulate, isocyanate ester compound.Prepared by following four step rule：The first step is preheated polyalcohol, isocyanates respectively；Polyalcohol, deionized water, surfactant, catalyst and inorganic particulate are well mixed by second step by proportioning；3rd step and isocyanate ester compound high-speed stirred；4th step free foaming, inorganic filler modified polyurethane foam material is made.Inorganic filler modified polyurethane foam material of the present invention is environment-friendly using deionized water as foaming agent, the high opening rate of polyurethane foam can provide passage for the flowing of sewage, the bioaffinity of filler can improve the adhesion property of microorganism, it is simple with method, cost is low, it is low for equipment requirements the advantages of.
Description
Technical field
The present invention relates to thermosetting polymer foamed material field, and in particular to a kind of inorganic filler modified polyurethane foam
Material and preparation method thereof.
Background technology
The sewage water treatment method of microorganism fixed growth make it that microorganism is a large amount of in the above numerous, it is necessary to rely on carrier
Grow, so as to improve the organic degradation ability of microorganism, sewage quality processing up to standard can not only be realized, and can be by residue
Sludge in-situ decomposes, and solves the problems, such as the intractable excess sludge of traditional biological treatment technology, thus is increasingly subject to the favor of people.
Microbe carrier is the key of the sewage disposal technology of microorganism fixed growth, and polyurethane foam plastics has that density is low, than
The features such as surface area is big, and there is regular three-dimensional network pore structure, it is a kind of ideal carrier material.But exist
The problems such as technology, performance and service life, especially adsorption capacity difference and poor mechanical property, have impact on its large-scale production
And application.Improving polyurethane foam plastics adsorption capacity and the method for mechanical property at present generally has：Introduce strong adsorption capacity
Activated carbon, shortcoming are that specific surface area is small, and stability is poor；Natural or organic polymer gel is added as sorbing material, then it is biological
Stability easily goes wrong.
Therefore, finding the method that can effectively improve cellular polyurethane earth Using Adsorption of Polyurethane Foam performance and biocompatibility has weight
The realistic meaning wanted.
The content of the invention
In view of the above the defects of prior art, it is an object of the invention to provide a kind of inorganic filler modified polyurethane
Foamed material, for solving the problems, such as that polyurethane foam plastics absorption property and biocompatibility are poor in the prior art.
To achieve the above object, the present invention provides a kind of inorganic filler modified polyurethane foam material, by following parts by weight
The raw material components of meter are mixed：Polyalcohol 90-110 parts, deionized water 3-8 parts, catalyst 0.1-2 parts, surfactant
0.5-2 parts, isocyanate ester compound 40-70 parts, inorganic particulate 1-30 parts.
Further, one kind in PPG, PEPA, biopolyol of the polyalcohol or
It is a variety of.
Further, the PPG is selected from ending amino polyether polyalcohol, dihydroxy polyether polyol alcohol, trihydroxy
One or more in PPG；The PEPA is selected from sulfonate modified PEPA；The bio-based is more
First alcohol is selected from castor oil or soybean oil.
Preferably, the ending amino polyether polyalcohol accounts for the 15-60% of PPG gross weight, the ending amino polyether point
For son amount between 200-1200, amine value is more than 100mg KOH/g, and remaining PPG is dihydroxy polyether polyol alcohol, three hydroxyls
One kind or two kinds of combinations in based polyether polyol, dihydroxy polyether polyol alcohol, the molecular weight of trihydroxy PPG are
Between 1500-3500, hydroxyl value 15-60mgKOH/g.The PPG of so specific composition of the invention, good hydrophilic property, with plant
Thing cultivation matrix is compound close, and joint product not only improves microbial activities, is adapted to planting again.
Preferably, the PEPA is sulfonate modified PEPA, molecular weight 1200-3500g/mol, hydroxyl
Value 25-80mgKOH/g.
Further, the catalyst is selected from triethanolamine, triethylene diamine, N, N- dimethyl cyclohexyl amines, the fourth of bay two
Ji Xi, stannous octoate one or more.
Further, the surfactant is selected from efficient silicone glycol copolymer, silicone stabilizer, silicone polyether
The one or more of copolymer, organo-silicon compound.
Further, the isocyanate ester compound be selected from toluene di-isocyanate(TDI), methyl diphenylene diisocyanate,
The one or more of hexamethylene diisocyanate.
Further, the inorganic particulate is selected from carborundum, expansible graphite, vermiculite, graphene oxide, galapectite and received
One or more in mitron, Cellulose nanocrystal.
In addition, present invention also offers a kind of preparation method of inorganic filler modified polyurethane foam material, it passes through such as
It is prepared by lower four step rule：The first step is preheated polyalcohol, isocyanates respectively, and temperature is 30-40 DEG C, time 0.5-
2h；Polyalcohol, deionized water, surfactant, catalyst and inorganic particulate are well mixed by second step by proportioning, stirring speed
Spend for 1000-2000r/min；3rd step and isocyanate ester compound high-speed stirred, mixing speed 1000-2000r/
Min, mixing time are the 3-20 seconds；4th step is poured into mould, free foaming, the static 20- under the conditions of 20-30 DEG C of temperature
It is stripped after 30min, then 24- is cured in the environment of product after the demoulding is placed on 20-30 DEG C of ventilation, relative humidity less than 40%
48 hours, that is, inorganic filler modified polyurethane foam material is made.
As described above, the inorganic filler modified polyurethane foam material of the present invention has the advantages that：The present invention's
Polyurethane foamed material is using deionized water as foaming agent, to overcome existing fluorine-containing foaming agent to destroy lacking for atmospheric ozone layer
Point, meets the needs of China is for environmental protection and sustainable development, green economy is environment-friendly, nontoxic non-ignitable；Foam process letter
Single, expansion ratio is controllable.On this basis, the inorganic particulate being on very good terms is blindly dated as sorbing material using biology to improve poly- ammonia
The biological adsorption performance and mechanical property of ester.Apply in the fields such as sewage disposal, the high opening rate and large scale of polyurethane foam
Abscess can provide passage for the flowing of sewage, and the bioaffinity of filler can improve the adhesion property of microorganism.
Brief description of the drawings
Fig. 1 is inoganic particle modified polyurethane foamed material density map prepared by comparative example and embodiment 1,2,3,4,5
Fig. 2 is inoganic particle modified polyurethane foamed material percent opening figure prepared by comparative example and embodiment 1,2,3,4,5
Embodiment
The present invention is specifically described below by embodiment, it is necessary to be pointed out that the present embodiment is served only for pair again
The present invention further illustrates, it is impossible to is interpreted as limiting the scope of the invention.
In the present invention, if not refering in particular to, used raw material and equipment etc. are commercially available or commonly used in the art.
Method in following embodiments, it is the conventional method of this area unless otherwise instructed.
Microorganism is trapped within water body, without with water by being attached to filler surface and entering filler internal void
Stream is lost in.The aperture of how many pairs of fillers of microorganism adhesion amount and percent opening suffer from requiring：Aperture is moderate, too big microorganism
It can be walked by current scour, the too small exchange for being unfavorable for nutriment in microorganism and water.Inorganic particulate is added, filler can be changed
The charge density on surface, so that microorganism is more likely to be grown in the filler surface.
Embodiment 1-5
The first step is pre- by PPG (ALDRICH companies, production code member 435406), toluene di-isocyanate(TDI) difference
Heating, temperature are 35 DEG C, time 1h；Second step by weight ratio, by 100 parts of PPG, 5 parts of deionized water, three
0.5 part of monoethanolamine, 0.5 part of efficient silicone glycol copolymer, graphite particle select respectively 0 part (blank example), 3.5 parts
(embodiment 1), 10.5 parts (embodiments 2), 18 parts (embodiments 3), 25 parts (embodiments 4) and 30 parts (embodiments 5), will be above-mentioned
Raw material is uniformly mixed, mixing speed 1000r/min, and mixing time is 1 minute；3rd step said mixture and toluene
0.5 part of 57 parts of diisocyanate, triethanolamine high-speed stirred, mixing speed 2000r/min, mixing time are 3 seconds；4th
Step is poured into mould, free foaming, is stripped after static 20-30min under the conditions of 20-30 DEG C of temperature, then product after the demoulding is put
Put and cured 36 hours in the environment of 20-30 DEG C of ventilation, relative humidity are less than 40%, that is, inorganic filler modified polyurethane is made
Foamed material.
The change of the inoganic particle modified front and rear polyurethane foam parameter of table 1
As can be seen from the above table, it is modified to polyurethane foam with the inorganic graphite particle of different weight part, the table of foam
Seeing density has increase, because foam has been grafted graphite particle；There is reduction in aperture；Percent opening and water holding multiplying power have
Improve, illustrate mesh-structured more flourishing after material modification, hydrophily is more preferable.When graphite particle parts by weight are 25 parts, through place
The percent opening of polyurethane foam after reason is 99.1%, and water holding multiplying power is 29.8, modified polyurethane foam carrier hydrophilicity
Well, microorganism adhesion amount significantly improves.
It should be noted that the addition of inorganic particulate, no more than 30 parts, if more than 30 parts, raw material stirring is difficult
It is difficult to be well mixed, and it is difficult to foam.
To sum up, modified polyurethane effective microbe solidified carrier of the invention can improve microorganism adhesion amount, and produce
Very strong reproductive ability (microorganism up to a million is bred in every milliliter), can quickly reduce BOD5 in water body (BOD),
COD (chemical oxygen consumption (COC)), TSS (solid suspension), there is very strong removal ability to ammonia nitrogen and phosphorus.This is inoganic particle modified poly-
Urethane effective microbe solidified carrier is administering the natural waters such as river course, it is not necessary to any chemical agent, selected all micro- lifes
Thing is from nature, without the strain of gene alteration, does not cause a disease and produce the danger of variation.Sewage after processing
Non-secondary pollution, caused microorganism natural death, there is no BOD (BOD) in water, then microorganism loses survival energy
Source, reduce naturally, turn into carbon dioxide and water, any injury is not produced to environment and biology.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is without departing from disclosed spirit and institute under technological thought such as
All equivalent modifications completed or change, it should be covered by the claim of the present invention.
Claims (8)
1. a kind of inorganic filler modified polyurethane foam material, it is characterised in that mix system by the raw material components of following parts by weight meter
Into：Polyalcohol 90-110 parts, deionized water 3-8 parts, catalyst 0.1-2 parts, surfactant 0.5-2 parts, isocyanates
Compound 40-70 parts, inorganic particulate 1-30 parts.
2. inorganic filler modified polyurethane foam material according to claim 1, it is characterised in that the polyalcohol is selected from
One or more in PPG, PEPA, biopolyol.
3. inorganic filler modified polyurethane foam material according to claim 2, it is characterised in that the PPG
One or more in ending amino polyether polyalcohol, dihydroxy polyether polyol alcohol, trihydroxy PPG；The polyester
Polyalcohol is selected from sulfonate modified PEPA；The biopolyol is selected from castor oil or soybean oil.
4. inorganic filler modified polyurethane foam material according to claim 1, it is characterised in that the catalyst is selected from
Triethanolamine, triethylene diamine, N, N- dimethyl cyclohexyl amines, bay dibutyl tin, the one or more of stannous octoate.
5. inorganic filler modified polyurethane foam material according to claim 1, it is characterised in that the surfactant
Selected from efficient silicone glycol copolymer, silicone stabilizer, silicone polyether copolymer, organo-silicon compound one or more.
6. inorganic filler modified polyurethane foam material according to claim 1, it is characterised in that the isocyanates
Compound is selected from toluene di-isocyanate(TDI), methyl diphenylene diisocyanate, the one or more of hexamethylene diisocyanate.
7. inorganic filler modified polyurethane foam material according to claim 1, it is characterised in that the inorganic particulate choosing
One or more from carborundum, expansible graphite, vermiculite, graphene oxide, halloysite nanotubes, Cellulose nanocrystal.
8. the inorganic filler modified polyurethane foam material according to claim any one of 1-7, it is characterised in that described
Foamed material is prepared by following four step rule：The first step is preheated polyalcohol, isocyanates respectively, temperature 30-40
DEG C, time 0.5-2h；Second step is mixed polyalcohol, deionized water, surfactant, catalyst and inorganic particulate by proportioning
Uniformly, mixing speed 1000-2000r/min；3rd step and isocyanate ester compound high-speed stirred, mixing speed are
1000-2000r/min, mixing time are the 3-20 seconds；4th step is poured into mould, free foaming, under the conditions of 20-30 DEG C of temperature
Be stripped after static 20-30min, then product after the demoulding be placed on 20-30 DEG C of ventilation, relative humidity be less than 40% in the environment of it is ripe
Change 24-48 hours, that is, inorganic filler modified polyurethane foam material is made.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108676142A (en) * | 2018-04-02 | 2018-10-19 | 西安理工大学 | Waste paper base nano micro crystal cellulose/compound polyurethane material and preparation method thereof |
| CN109021210A (en) * | 2018-07-17 | 2018-12-18 | 成都市水泷头化工科技有限公司 | It is a kind of to go formaldehyde, degradable automobile interior decoration foamed plastics and preparation method |
| CN109179640A (en) * | 2018-10-31 | 2019-01-11 | 浙江工业大学上虞研究院有限公司 | A kind of cellular polyurethane foam beads filler of suitable for movable bed biofilm reactor and preparation method thereof |
| CN110183609A (en) * | 2019-04-23 | 2019-08-30 | 合肥科天水性科技有限责任公司 | A kind of solvent-free polyurethane resin and its application |
| CN110204675A (en) * | 2019-05-05 | 2019-09-06 | 北京航天试验技术研究所 | A method of for making the composition and production locating pad of locating pad |
| CN110812946A (en) * | 2019-10-09 | 2020-02-21 | 安徽伟创聚合材料科技有限公司 | Preparation process of sewage filtering material |
| CN111138843A (en) * | 2019-12-31 | 2020-05-12 | 苏州桐力光电股份有限公司 | Graphene-based polyurethane porous nano material and preparation method thereof |
| CN111530435A (en) * | 2020-05-22 | 2020-08-14 | 西南科技大学 | Polyurethane soft foam adsorption material internally wrapped with chrysotile nanotubes and preparation method thereof |
| CN112624329A (en) * | 2020-12-29 | 2021-04-09 | 南京万德斯环保科技股份有限公司 | Sewage deep denitrification filler taking sulfur autotrophic denitrification as core and treatment method |
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| CN113698562A (en) * | 2021-07-21 | 2021-11-26 | 陈鹏云 | Solvent-free synthetic material applying ice and snow movement and preparation method thereof |
| CN114590896A (en) * | 2021-03-24 | 2022-06-07 | 景赫新材料科技(浙江)有限公司 | Paving material for building biological diversity of riverbed |
| CN114621461A (en) * | 2021-03-26 | 2022-06-14 | 景赫新材料科技(浙江)有限公司 | Polyurethane hydrogel of composite nanoparticles and application |
| CN114644401A (en) * | 2021-03-26 | 2022-06-21 | 景赫新材料科技(浙江)有限公司 | Biological floating island for purifying natural water body |
| WO2022219950A1 (en) * | 2021-04-15 | 2022-10-20 | 日清紡ケミカル株式会社 | Microorganism-immobilized carrier for water treatment, flexible polyurethane foam composition, and method for producing flexible polyurethane foam |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108676142A (en) * | 2018-04-02 | 2018-10-19 | 西安理工大学 | Waste paper base nano micro crystal cellulose/compound polyurethane material and preparation method thereof |
| CN109021210A (en) * | 2018-07-17 | 2018-12-18 | 成都市水泷头化工科技有限公司 | It is a kind of to go formaldehyde, degradable automobile interior decoration foamed plastics and preparation method |
| CN109179640B (en) * | 2018-10-31 | 2021-08-06 | 浙江工业大学上虞研究院有限公司 | Porous polyurethane foam particle filler suitable for moving bed biofilm reactor and preparation method thereof |
| CN109179640A (en) * | 2018-10-31 | 2019-01-11 | 浙江工业大学上虞研究院有限公司 | A kind of cellular polyurethane foam beads filler of suitable for movable bed biofilm reactor and preparation method thereof |
| CN110183609A (en) * | 2019-04-23 | 2019-08-30 | 合肥科天水性科技有限责任公司 | A kind of solvent-free polyurethane resin and its application |
| CN110183609B (en) * | 2019-04-23 | 2021-12-24 | 合肥科天水性科技有限责任公司 | Solvent-free polyurethane resin and application thereof |
| CN110204675A (en) * | 2019-05-05 | 2019-09-06 | 北京航天试验技术研究所 | A method of for making the composition and production locating pad of locating pad |
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