CN112175203B - Preparation method of natural gutta-percha emulsion - Google Patents
Preparation method of natural gutta-percha emulsion Download PDFInfo
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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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/07—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C1/00—Treatment of rubber latex
- C08C1/02—Chemical or physical treatment of rubber latex before or during concentration
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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
- C08J2307/00—Characterised by the use of natural rubber
Abstract
The invention discloses a preparation method of natural gutta-percha emulsion, which comprises the following steps: freezing eucommia seed shell, leaf or bark at low temperature, pulverizing, sieving, dissolving, extracting, and separating to obtain eucommia ulmoides gum solution; adding the gutta-percha glue solution into a glass reaction kettle, adding an oily emulsifier and an antioxidant, and stirring to obtain a gutta-percha coarse emulsion; adding the aqueous emulsifier, the pH regulator, the mechanical stabilizer and the soft water into a reaction kettle, heating, adding the gutta percha crude emulsion, distilling, shearing and emulsifying; and finally standing the emulsion, and filtering to obtain the natural gutta-percha emulsion. In the preparation process, the dissolving glue solution is directly used for emulsification, so that the procedures of solidification, solvent removal, drying and the like of the gutta percha glue solution in the extraction process are omitted, the using amount of the solvent is reduced, the solvent loss is relatively reduced, the energy consumption is reduced, and the cost is saved; meanwhile, the same solvent is adopted for extracting the gel and emulsifying, the process is simple and convenient, the operation is easy, and the large-scale production is facilitated.
Description
Technical Field
The invention belongs to the field of eucommia ulmoides rubber latex, and particularly relates to a preparation method of natural eucommia ulmoides rubber latex.
Background
The gutta-percha is derived from eucommia trees and mainly exists in eucommia leaves, cortex and seeds, wherein the glue content of the leaves is 2-4%, the glue content of the cortex is 8-10%, and the glue content of the seeds is 10-30%, so that the gutta-percha is a precious high-quality natural rubber resource in the world. At present, the cultivation area of eucommia bark in China is about 35 ten thousand hm 2 Accounts for more than 99 percent of the total area of the eucommia ulmoides planted in the world, and has unique resource advantages. Gutta-percha is also known as gutta or balata, because it contains trans-1, 4-polyisoprene as do the gutta-percha tree in the tropical rainforest of south east asia and the balata tree (mimusops balata) in the tropical rainforest of south america. The chemical composition of the gutta-percha is the same as that of natural rubber, but the gutta-percha is structurally isomer, the difference of the two structures causes the difference of macroscopic performance, the natural rubber is a good elastomer, and the gutta-percha is a crystalline hard material.
The eucommia ulmoides gum is a plastic with memory characteristics, and has excellent hydrolysis resistance, mildew and rot resistance, and acid, alkali and salt corrosion resistance; its tan delta-T curve exhibits bimodal characteristics, with tan delta peaks in the medium and high temperature region exceeding those of other rubbers. The gutta-percha is a natural polymer material, has no toxic or side effect, and does not have the catalyst residue problem commonly existing in synthetic polymers. Therefore, the gutta percha is widely used in the fields of various shock-absorbing parts, silencing parts, medical appliances and the like in the fields of seabed, lake bottom, river bottom and underground gas transmission, water transmission and oil pipeline laying. Meanwhile, the gutta-percha has the advantages of high elasticity, low heat generation, tearing resistance, puncture resistance and the like due to the fact that the gutta-percha is soft and smooth in macromolecular chain, good in elasticity, regular in macromolecular chain, small in internal friction, low in heat generation and easy to crystallize in gutta-percha macromolecule, exists in the vulcanized blended rubber in a microcrystal phase, and can be torn and bent when cracks occur, and therefore the gutta-percha is tear-resistant and puncture-resistant, and has a great prospect in the application aspect of green tires due to the fact that the gutta-percha is added into the tires in a certain proportion. However, the eucommia ulmoides rubber has plastic characteristics, so that the eucommia ulmoides rubber has poor compatibility when being blended with other rubber, and the physical and mechanical properties such as tensile strength, tear strength and the like of the blended rubber are not ideal, so that more researches are needed for industrial application in the aspect of tires.
The main component of the gutta-percha molecular chain is trans-1, 4-polyisoprene, but the structure is not completely the same as that of artificial synthesis, the molecular chain of the gutta-percha is blocked by hydrophilic ester group, and the structural characteristic endows the gutta-percha with certain water solubility. After the eucommia ulmoides latex is converted into the latex, the compatibility of the eucommia ulmoides latex can be improved when the eucommia ulmoides latex is blended with other rubber latex, the physical and mechanical properties of the blended rubber are improved, and the eucommia ulmoides latex can also be used in an expanded application field such as coating, for example, the eucommia ulmoides latex can be endowed with excellent air tightness, oil resistance, adhesion, wet and skid resistance and other properties by carrying out epoxidation modification on the latex.
At present, the emulsification method of the eucommia ulmoides gum is to plasticate extracted solid eucommia ulmoides gum, dissolve the solid eucommia ulmoides gum in an organic solvent and emulsify a gum solution, and the emulsification method has good emulsification effect, but in the gum extraction process, the eucommia ulmoides gum solution needs to be solidified, the used solvent needs to be removed, and the drying process needs several additional processes, so that the cost of the eucommia ulmoides emulsion is increased, and the popularization, the application and the range of the eucommia ulmoides latex are limited to a certain extent.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects and shortcomings in the background art and provide a preparation method of natural gutta-percha emulsion.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a preparation method of natural gutta-percha emulsion comprises the following steps:
(1) Freezing eucommia seed shell, leaf or bark at low temperature, pulverizing, sieving, dissolving, extracting, and separating to obtain eucommia ulmoides gum solution;
(2) Adding the gutta-percha glue solution into a glass reaction kettle, adding an oily emulsifier and an antioxidant, and stirring for 3-5 hours at the rotating speed of 300-500 r/min and the temperature of 60-90 ℃ to obtain a gutta-percha coarse emulsion;
(3) Adding an aqueous emulsifier, a pH regulator, a mechanical stabilizer, a defoaming agent, an anti-web agent and soft water into a reaction kettle, heating to 60-95 ℃, adding an gutta percha crude emulsion, distilling under the conditions of stirring speed of 300-500 r/min and vacuum degree of-0.03 MPa-0.08 MPa for 4-12 hours, converting a mixed solution from an oil phase into a water phase, and emulsifying at a shearing speed of 7000-9000 r/min for 10-20 minutes to obtain an aqueous emulsion;
(4) And finally standing the emulsion for 24 hours, and filtering to obtain the natural gutta-percha emulsion.
In the preparation method, preferably, in the step (2), the addition amount of each raw material is as follows by weight: 100 parts of gutta-percha liquid, 1.0-5.0 parts of oily emulsifier and 1.0-3.0 parts of antioxidant.
In the above preparation method, preferably, in the step (2), the oily emulsifier is one of sorbitan monolaurate (trade name: span 20), sorbitan monopalmitate (trade name: span 40), sorbitan monostearate (trade name: span 60), sorbitan monooleate (trade name: span 80) and oleic acid;
the antioxidant is one of N-phenyl-B-naphthylamine (antioxidant D), 2-mercaptobenzimidazole (antioxidant MB), 2, 4-trimethyl-1, 2-dihydroquinoline polymer (antioxidant RD), N '-di (beta-naphthyl) p-phenylenediamine (antioxidant DNP), 2' -methylene-bis (4-methyl-6-nonylphenol) and styrenated phenol (antioxidant SP).
In the preparation method, preferably, in the step (3), the addition amounts of the raw materials are as follows: 50 to 100 portions of eucommia ulmoides gum crude emulsion, 5 to 10 portions of water-based emulsifier, 5 to 10 portions of pH regulator, 0.5 to 1.0 portion of mechanical stabilizer, 0.01 to 0.1 portion of defoamer, 0.01 to 0.1 portion of web inhibitor and 450 to 990 portions of soft water.
In the above preparation method, preferably, the aqueous emulsifier is one of ammonium oleate, potassium oleate, triethanol oleate, aromatic polyethylene glycol diethyl ether, polyether polysulfide, sodium alkylsulfate, sodium dibutylnaphthalene sulfonate, sodium isobutylnaphthalene sulfonate, sodium dioctyl sulfosuccinate, adduct of ethylene oxide and fatty alcohol, polyoxyethylene sorbitan monolaurate (trade name tween 20), polyoxyethylene sorbitan monopalmitate (trade name tween 40), polyoxyethylene sorbitan monostearate (trade name tween 60), and polyoxyethylene sorbitan monooleate (trade name tween 80);
the mechanical stabilizer is one of potassium hydroxide, sodium hydroxide, potassium laurate, ammonium laurate, sodium dodecyl sulfate, sodium vinylsulfonate, N-methyl-N-oleoyl taurate, a condensate of ethylene oxide and fatty alcohol (peregal 0) and octyl phenyl polyoxyethylene ether (trade name 65-03).
In the above preparation method, preferably, the pH regulator is potassium hydroxide or sodium hydroxide;
the defoaming agent is one of an organic siloxane emulsion defoaming agent, a polysiloxane polyether copolymerization type defoaming agent, a mixture of sec-octanol isomeric methylcyclohexanol and 201-100 methyl silicon, a defoaming agent 691, a defoaming agent WBA and a defoaming agent 8034A;
the web-resistant agent is any one of n-butyl alcohol and lanolin.
Preferably, in the step (1), the specific preparation process of the eucommia ulmoides gum solution comprises: freezing eucommia seed shells, leaves or barks at the temperature of-1 ℃ to-20 ℃ for 30 to 60 minutes, then crushing in a high-speed crusher, and sieving to control the particle size of powder to be less than 0.5 mm; dissolving the powder material in organic solvent at 60-95 deg.c and stirring speed of 300-500 rpm for 4-6 hr, centrifuging the extracted liquid and filtering to obtain eucommia bark glue solution.
In the above production method, the organic solvent is preferably at least one selected from the group consisting of petroleum ether, cyclohexane, toluene, xylene, decalin and gasoline.
According to the preparation method, the solid content of the prepared natural gutta-percha emulsion is preferably 5-30%.
Compared with the prior art, the invention has the advantages that:
(1) In the preparation process, the dissolving glue solution is directly used for emulsification, so that the processes of solidification, solvent removal, drying and the like of the gutta percha glue solution in the extraction process are omitted, the using amount of the solvent is reduced, the loss of the solvent is relatively reduced, the energy consumption is reduced, and the cost is saved; meanwhile, the same solvent is adopted for extracting the gel and emulsifying, the process is simple and convenient, the operation is easy, and the large-scale production is facilitated.
(2) In the preparation process, the eucommia seed shells, leaves or barks are frozen before being dipped in the organic solvent, so that the brittleness of materials is improved, and the materials are convenient to crush; replace traditional mill high temperature plastication with smashing, reduce the molecular weight of gutta-percha to sieve kibbling material, come control molecular weight size through the size of control kibbling material particle diameter, can increase the contact surface of powder and organic solvent like this, improve the solubility of gutta-percha at organic solvent, improve the emulsifying property of gutta-percha and the stability of latex.
(3) In the preparation process, the organic solvent adopted in the emulsification process can be recovered by a distillation method, the recovery rate and the purity are high, the recovered solvent can be continuously used for next gum extraction of eucommia seed shells and the like and emulsification of eucommia gum, the solvent can be recycled, and the environmental pollution is reduced.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example 1 (preparation of gutta percha latex with 15% solids):
the preparation method of the natural gutta percha emulsion comprises the following steps:
(1) Freezing 400 parts of eucommia seed shells at-5 ℃ for 40 minutes, then crushing the eucommia seed shells in a high-speed crusher, and sieving the eucommia seed shell powder to control the particle size to be below 0.5 mm; dissolving eucommia seed shell powder by 1000 parts of cyclohexane at 70 ℃ and at a stirring speed of 500r/min, extracting for 5 hours, centrifuging the extract liquid for 5 minutes by a high-speed centrifuge at a speed of 3500r/min, and filtering the eucommia ulmoides gum extract liquid by 40-mesh nylon cloth to obtain eucommia ulmoides gum liquid with the solid content of 10%;
(2) Taking 1000 parts of the eucommia ulmoides gum solution with the solid content of 10% prepared in the step (1), adding the eucommia ulmoides gum solution into a glass reaction kettle, adding 3.5 parts of oleic acid, 1.0 part of span 80 and 1.5 parts of an anti-aging agent SP, and stirring for 5 hours at the rotation speed of 500r/min and the temperature of 70 ℃ to obtain a eucommia ulmoides gum crude emulsion;
(3) Adding 5 parts of water-based emulsifier triethanolamine, 5 parts of pH regulator potassium hydroxide, 0.5 part of mechanical stabilizer potassium laurate, 0.05 part of defoamer WBA, 0.1 part of webbed agent n-butanol and 1100 soft water into a reaction kettle, heating to 70 ℃, adding the eucommia ulmoides gum crude emulsion prepared in the step (2), distilling at the stirring speed of 500r/min and the vacuum degree of not more than-0.05 MPa, and emulsifying for 15 minutes at the shearing speed of 8500r/min when the mixed solution is converted into a water phase from an oil phase after distilling for 6 hours, so that the mixed solution becomes a water-based emulsion;
(4) Standing the emulsified liquid for 24 hours, and filtering to obtain the gutta-percha latex with the solid content of 15%.
Example 2 (preparation of gutta percha latex with 25% solids):
the preparation method of the natural gutta-percha emulsion comprises the following steps:
(1) Freezing 400 parts of eucommia seed hulls at the temperature of minus 5 ℃ for 40 minutes, then crushing the eucommia seed hulls in a high-speed crusher, sieving the eucommia seed hull powder to control the particle size to be below 0.5mm, dissolving the eucommia seed hull powder by 1250 parts of petroleum ether at the temperature of 70 ℃ and the stirring speed of 500r/min, extracting for 5 hours, centrifuging the extract liquid for 5 minutes by using a high-speed centrifuge at the speed of 3500r/min, and then filtering the eucommia ulmoides gum extract liquid by using 40-mesh nylon cloth to obtain eucommia ulmoides gum liquid with the solid content of 8 percent;
(2) 1250 parts of the eucommia ulmoides gum solution with the solid content of 8% prepared in the step (1) are added into a glass reaction kettle, then 4.0 parts of span 80 and 1.5 parts of anti-aging agent SP are added, and the mixture is stirred for 5 hours at the rotation speed of 500r/min and the temperature of 70 ℃ to obtain a eucommia ulmoides gum crude emulsion;
(3) Adding 5 parts of aqueous emulsifier sodium dodecyl sulfate, 2 parts of Tween 40, 5 parts of pH regulator potassium hydroxide, 0.5 part of mechanical stabilizer potassium laurate, 0.05 part of defoamer WBA, 0.1 part of webbed agent n-butanol and 1400 parts of soft water into a reaction kettle, heating to 70 ℃, adding the eucommia ulmoides gum crude emulsion obtained in the step (2), distilling at the stirring speed of 500r/min and the vacuum degree of not more than-0.06 MPa, and emulsifying for 10min at the shearing speed of 8500r/min when the mixed solution is converted into a water phase from an oil phase after distilling for 10 hours, so that the mixed solution is changed into an aqueous emulsion;
(4) Standing the emulsified emulsion for 24 hours, and filtering to obtain the gutta-percha latex with the solid content of 25%.
Comparative example (preparation of gutta percha latex with 25% solids):
the preparation process of the eucommia ulmoides latex of this comparative example was as follows:
(1) Dissolving and extracting 400 parts of eucommia ulmoides seed shells by 1250 parts of petroleum ether at the temperature of 70 ℃ to obtain a crude eucommia ulmoides liquid glue;
(2) Filtering the coarse eucommia ulmoides gum solution obtained in the step (1) by using 40-mesh nylon cloth, cooling the gum solution to below 20 ℃, separating the gum from seed shell scraps, and solidifying the eucommia ulmoides gum;
(3) In the solidified gutta percha, the weight ratio of 1:1 proportion, adding soft water, distilling for 6 hours at the temperature of 70 ℃ and the vacuum degree of-0.05 MPa, and removing the solvent;
(4) Drying the gutta-percha with the solvent removed in an oven at the temperature of 60 ℃ for 10 hours to obtain dried gutta-percha;
(5) Plasticating 100 parts of dried gutta-percha on an open mill, then slicing the gutta-percha, adding the gutta-percha into a glass reaction kettle, adding 4 parts of span 80, 1.5 parts of antioxidant SP and 1244.5 parts of petroleum ether, and stirring for 5 hours at the rotating speed of 500r/min and the temperature of 75 ℃ to obtain a glue solution with the solid content of 8%;
(6) Adding 5 parts of aqueous emulsifier sodium dodecyl sulfate, 2 parts of Tween 40, 5 parts of pH regulator potassium hydroxide, 0.5 part of mechanical stabilizer potassium laurate, 0.05 part of defoamer WBA, 0.1 part of webbed agent n-butyl alcohol and 1400 soft water into a reaction kettle, heating to 70 ℃, adding the glue solution prepared in the step (5), distilling at the stirring speed of 500r/min and the vacuum degree of not more than-0.06 MPa, and emulsifying the mixed solution for 10 minutes at the shearing speed of 8500r/min when the oil phase is converted into a water phase after distilling for 10 hours, so as to obtain an aqueous emulsion;
(7) Standing the emulsified emulsion for 24 hours, and filtering to obtain the gutta-percha latex with the solid content of 25%.
The energy consumption and solvent loss for the preparation of gutta percha latex in table 1 were recorded and tested as shown in table 1.
Table 1: energy consumption and solvent loss and latex Performance comparison
| Item | Example 1 | Example 2 | Comparative example | Inspection method |
| 100 grams of energy consumption, W | 3.5 | 5 | 18 | / |
| Solvent recovery rate% | 96.5 | 95 | 75 | / |
| Percent conversion of eucommia ulmoides latifolia by | 99.4 | 99.2 | 92 | / |
| Total solid content (mass fraction) a,%, minimum | 18.2 | 28.5 | 22.0 | GB/T8298 |
| Mechanical stability s, minimum | 910 | 900 | 870 | GB/T8301 |
| Residue content (mass fraction)/%, maximum | 0.10 | 0.10 | 0.15 | GB/T8293 |
| KOH number, maximum | 1.15 | 1.20 | 1.22 | GB/T8297 |
| Average particle size (nm), maximum | 970 | 980 | 990 | / |
As can be seen from the comparison of the test results of the example 2 and the comparative example in table 1, the energy consumption of the preparation method of the natural gutta percha emulsion in the example 2 of the present invention is reduced by 2.5 times compared with the comparative example, the solvent recovery rate is improved by 20%, the conversion rate of the gutta percha latex is improved by 7.2%, the total solid content is improved by 6.5%, the average particle size of the emulsified latex is reduced, the mechanical stability is improved, the residue content is reduced, and the change of the KOH value is not great, which indicates that the preparation method of the natural gutta percha emulsion of the present invention is simple and convenient to operate, can effectively reduce the cost, and the emulsified gutta percha latex has good performance and great technical advantages, and will have great promotion effect on the application prospect of gutta percha.
Claims (9)
1. The preparation method of the natural gutta-percha emulsion is characterized by comprising the following steps of:
(1) Freezing eucommia seed shell, leaf or bark at low temperature, pulverizing, sieving, dissolving, extracting, and separating to obtain eucommia ulmoides gum solution;
(2) Adding the gutta-percha glue solution into a glass reaction kettle, adding an oily emulsifier and an antioxidant, and stirring for 3 to 5h under the conditions that the rotation speed is 300 to 500r/min and the temperature is 60 to 90 ℃ to obtain a gutta-percha crude emulsion;
(3) Adding an aqueous emulsifier, a pH regulator, a mechanical stabilizer, a defoaming agent, an webbed agent and soft water into a reaction kettle, heating to 60-95 ℃, adding an gutta percha coarse emulsion, distilling under the conditions that the stirring speed is 300-500r/min and the vacuum degree is-0.03-0.08 MPa, and after distilling for 4-12 hours, when the mixed solution is converted into a water phase from an oil phase, shearing and emulsifying;
(4) And finally standing the emulsion for 24 hours, and filtering to obtain the natural gutta-percha emulsion.
2. The preparation method according to claim 1, wherein in the step (2), the addition amount of each raw material is, in parts by weight: 100 parts of gutta-percha glue solution, 1.0 to 5.0 parts of oily emulsifier and 1.0 to 3.0 parts of antioxidant.
3. The method according to claim 2, wherein in the step (2), the oily emulsifier is one of sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, oleic acid;
the antioxidant is one of N-phenyl-beta-naphthylamine, 2-mercaptobenzimidazole, 2, 4-trimethyl-1, 2-dihydroquinoline polymer, N '-di (beta-naphthyl) p-phenylenediamine, 2' -methylenebis (4-methyl-6-nonylphenol) and styrenated phenol.
4. The preparation method according to claim 1, wherein in the step (3), the addition amount of each raw material is, in parts by weight: 50 to 100 parts of gutta-percha crude emulsion, 5 to 10 parts of aqueous emulsifier, 5 to 10 parts of pH regulator, 0.5 to 1.0 part of mechanical stabilizer, 0.01 to 0.1 part of defoamer, 0.01 to 0.1 part of web inhibitor and 450 to 990 parts of soft water.
5. The method of claim 4, wherein the aqueous emulsifier is one of ammonium oleate, potassium oleate, triethanol oleate, sodium alkylsulfate, sodium dibutylnaphthalene sulfonate, sodium isobutylnaphthalene sulfonate, sodium dioctylsulfosuccinate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, and polyoxyethylene sorbitan monooleate;
the mechanical stabilizer is one of potassium hydroxide, sodium hydroxide, potassium laurate, ammonium laurate, sodium dodecyl sulfate, sodium vinylsulfonate, N-methyl-N-oleoyl taurate, a condensate of ethylene oxide and fatty alcohol, and octyl phenyl polyoxyethylene ether.
6. The method according to claim 4, wherein the pH adjuster is potassium hydroxide or sodium hydroxide;
the defoaming agent is one of an organic siloxane emulsion defoaming agent, a polysiloxane polyether copolymer defoaming agent, a mixture of sec-octanol isomeric methylcyclohexanol and 201-100 methyl silicon, a defoaming agent 691, a defoaming agent WBA and a defoaming agent 8034A;
the web-resistant agent is any one of n-butyl alcohol and lanolin.
7. The preparation method according to any one of claims 1 to 6, wherein in the step (1), the specific preparation process of the eucommia ulmoides gum solution comprises the following steps: freezing eucommia seed shells, leaves or barks at the temperature of-1 ℃ to-20 ℃ for 30 to 60 minutes, then crushing the eucommia seed shells, the leaves or the barks in a high-speed crusher, and sieving the eucommia seed shells, the leaves or the barks to control the particle size of powder materials to be less than 0.5 mm; dissolving the powder material in organic solvent at 60-95 deg.c and stirring speed of 300-500 rpm for 4-6 hr, centrifuging the extracted liquid and filtering to obtain eucommia bark glue solution.
8. The method according to claim 7, wherein the organic solvent is at least one selected from the group consisting of petroleum ether, cyclohexane, toluene, xylene, decalin and gasoline.
9. The preparation method according to any one of claims 1 to 6, wherein the natural gutta percha emulsion is prepared with a solid content of 5 to 30%.
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| "Preparation of synthetic gutta-percha crude latex";Xin Xin et al.;《合成橡胶工业》;20180915;第41卷(第5期);第399页 * |
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| Publication number | Publication date |
|---|---|
| CN112175203A (en) | 2021-01-05 |
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