CN110862466B

CN110862466B - Concentration method of low-concentration eucommia ulmoides latex

Info

Publication number: CN110862466B
Application number: CN201911214519.9A
Authority: CN
Inventors: 郭舜华; 蔡克平; 陈俐
Original assignee: Zhuzhou Rubber Research and Design Institute Co Ltd of Chemchina
Current assignee: Zhuzhou Rubber Research and Design Institute Co Ltd of Chemchina
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2022-05-20
Anticipated expiration: 2039-12-02
Also published as: CN110862466A

Abstract

The invention provides a method for concentrating low-concentration eucommia ulmoides latex, which comprises the following steps of: adding low-concentration eucommia ulmoides latex into a reaction kettle, then adding a mechanical stabilizer, a pH regulator and a foam inhibitor, and evaporating and condensing under a vacuum degree environment to obtain concentrated eucommia ulmoides latex. The method is adopted to concentrate the low-concentration eucommia latex, the total solid content of the latex after evaporation concentration can reach 80 percent, an evaporation pipeline is not blocked, the emulsification process is stable, and the concentration efficiency is at least improved by more than 2 times; and because most of water and residual solvent are removed, the content of the non-rubber component in the latex is increased, so that the adhesive force, the mechanical stability, the chemical stability and the ageing resistance of the latex are improved, and the latex has a wider application prospect in some special fields, such as textile dipping and gluing, regenerated leather, carpets, foam products, adhesives, latex cement and the like, and can obtain better service performance.

Description

Concentration method of low-concentration eucommia ulmoides latex

Technical Field

The invention belongs to the technical field of eucommia ulmoides latex, and particularly relates to a method for concentrating low-concentration eucommia ulmoides latex.

Background

The gutta-percha is from eucommia bark trees and mainly exists in leaves, skins and seeds of eucommia bark, wherein the glue content of the leaves is 2-4 percent, the glue content of the skins is 8-10 percent, and the glue content of the seeds is 10-30 percent, so that the gutta-percha is a very precious high-quality natural rubber resource in the world. At present, the eucommia cultivation area in China is about 35 million hectares, which accounts for more than 99 percent of the total eucommia cultivation area in the world, and the eucommia cultivation method has unique resource advantages. Gutta percha is also called gutta (guttapercha) or balata (balata) because it contains trans-1, 4-polyisoprene as do the gutta percha (palaiquan) in tropical rainforests of south east asia and the balata (mimosops balata) in tropical rainforests 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 gutta-percha is plastic with memory property, and has excellent hydrolysis resistance, rot and deterioration resistance and acid, alkali and salt corrosion resistance; the tan delta-T curve of the rubber has a bimodal characteristic, and the tan delta peak value in a medium-high temperature area exceeds that of other rubbers; it is a natural high molecular material, has no toxic side effect, and has no catalyst residue problem commonly existed in synthetic high molecular material. Therefore, the gutta-percha is widely applied to the fields of various shock-absorbing parts, silencing devices, medical appliances and the like in the laying of gas transmission, water transmission and oil transmission pipelines at the bottom of sea, lake and river and deeply buried underground. Meanwhile, the gutta-percha has the characteristics of high elasticity, low heat generation, wear resistance, tearing resistance, prick resistance and the like due to the fact that the gutta-percha has a micro-crystalline phase in vulcanized blended rubber because of the fact that a macromolecular chain of the gutta-percha is flexible, good in elasticity, regular in macromolecular chain, small in internal friction, low in heat generation and easy to crystallize, and can be torn and bent when a crack occurs, so that the gutta-percha is tear-resistant and puncture-resistant. However, the eucommia ulmoides rubber has plastic characteristics, and when the eucommia ulmoides rubber is blended with other rubber, the compatibility is not good, so that the physical and mechanical properties such as tensile strength, tearing strength and the like of the blended rubber are not ideal, and therefore, 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 gutta percha molecular chain is not completely the same as the structure of artificially synthesized gutta percha molecular chain. The molecular chain of the gutta-percha is blocked by a hydrophilic ester group, and the structural characteristic endows the gutta-percha with certain hydrophilicity. When the eucommia ulmoides latex is formed into latex and then is blended with other rubber latex, the compatibility of the eucommia ulmoides latex can be improved, the physical and mechanical properties of the blended rubber can be improved, and the eucommia ulmoides latex can be endowed with excellent air tightness, oil resistance, adhesion, wet and skid resistance and other properties by virtue of epoxidation modification.

Because the gutta-percha has the characteristic of plastics and is difficult to dissolve in an organic solvent, the concentration of the prepared organic solution is not high, and the organic solvent contained in the gutta-percha latex with high concentration is difficult to remove, so that the concentration of the gutta-percha latex prepared by the existing production process is lower and is only about 5-20%. The low-concentration eucommia ulmoides latex has high transportation and packaging costs, is not beneficial to being blended with other latex, is difficult to form, influences the product quality and increases the production cost; if the eucommia ulmoides latex concentration is not high when thick products are manufactured, the dipping times are increased, the labor intensity of workers is increased, and when latex sponges are produced, the products collapse due to low concentration, the foams are unstable, and the foaming quality of the sponges is affected. Therefore, in order to widen the application field of the eucommia ulmoides latex, it is necessary to concentrate it.

Conventionally, the latex is concentrated by a method such as centrifugation, creaming or evaporation. A process for concentrating latex by creaming method includes such steps as weakening the Brownian movement of colloidal particles under the action of creaming agent, forming dispersed aggregates between colloidal particles, floating colloidal particles by gravity due to the density difference between colloidal particles and whey, and slowly separating out whey. The creaming method has the disadvantages that the organic solvent in the eucommia ulmoides latex is difficult to remove completely, the creaming agent remained in the latex can cause post-creaming, the obtained concentrated latex has high viscosity and poor stability, and meanwhile, the creaming time is long and the concentration efficiency is low.

The centrifugal method is to utilize a centrifugal machine rotating at a high speed to generate centrifugal acceleration which is much larger than gravitational acceleration to act on latex, change the separation condition under a static state, accelerate the separation speed of rubber particles and whey, and further achieve the aim of concentrating the latex. The centrifugal method has the disadvantages that the organic solvent in the eucommia ulmoides latex is difficult to remove completely, and the centrifugal method separates colloidal particles from whey by using centrifugal force generated by a centrifugal machine, so that the centrifugal speed is high, the latex particles are easy to aggregate, the latex particles are enlarged, the stability of concentrated latex is poor, the centrifugal speed is slightly high, and the latex is easy to aggregate. Because the artificial synthetic emulsified latex has better emulsifying effect than natural latex and larger particle size, colloidal particles are easy to aggregate and solidify in the centrifugal process. Therefore, the centrifugation method is not suitable for concentrating low concentration of eucommia ulmoides latex.

The evaporation method is to add the latex into a special evaporator, and concentrate the latex by means of evaporation of water, the common evaporator adopts a double-wall drum as the evaporator, the drum is provided with a uniform shaft at the horizontal position for rotation, a hollow drum is arranged in the drum, circulating hot water is introduced into the double-wall drum to heat and evaporate the water in the latex, and the steam in the drum is pumped out by a blower. According to the method, water vapor and a solvent in a barrel are pumped out through an air blower, but the water vapor and the solvent are difficult to condense in time due to the fact that the water vapor and the solvent do not pass through a low-temperature condensing tube, so that the water vapor and the organic solvent are slowly led out, evaporation efficiency is influenced, and latex volume expansion is caused due to temperature rise, so that latex is sprayed, and pipelines are blocked. In additionIn addition, because the molecular structure of gutta-percha is trans-polyisoprene, two methines-CH are arranged on each chain unit₂On the opposite side of the double bond axis direction, the trans-long chain molecules are ordered and are easy to orderly aggregate and crystallize, so that the double bond axis-oriented polymer emulsion has the advantages of plastic property, high hardness, high molecular weight, low solubility in an organic solvent, high glue solution viscosity and difficulty in emulsification, a large amount of emulsifier is required to be added during emulsification, more foam is generated in an evaporation process, the foam wraps water vapor, the water vapor is not easy to be pumped out, and when the water vapor is accumulated to a certain amount, the situation that a large amount of water vapor bubbles carry latex to jet to block a pipeline even occurs, so that continuous concentration cannot be realized.

Therefore, research and development of a process for concentrating low-concentration eucommia ulmoides latex are urgently needed to improve market application prospects.

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 method for concentrating low-concentration eucommia ulmoides latex.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

a method for concentrating low-concentration eucommia ulmoides latex comprises the following steps:

adding the low-concentration eucommia ulmoides latex into a reaction kettle, then adding a mechanical stabilizer, a pH regulator and a foam inhibitor, and evaporating and condensing under a vacuum environment to obtain the concentrated eucommia ulmoides latex.

In the concentration method, preferably, the low-concentration eucommia ulmoides latex is 100 to 1000 parts by weight, the mechanical stabilizer is 0.2 to 1.5 parts by weight, and the foam inhibitor is 0.02 to 1.0 part by weight.

In the above concentration method, the foam inhibitor is preferably at least one of emulsified dimethyl silicone oil, sec-octanol, isomeric methylcyclohexanol, lanolin, stearamide, glycerol monoricinoleate, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether and polyoxypropylene polyoxyethylene glycerol ether; the mechanical stabilizer is potassium laurate and/or ammonium laurate; the pH regulator is sodium hydroxide and/or potassium hydroxide.

According to the method, the foaming property of the eucommia ulmoides latex at high temperature and high vacuum degree can be effectively inhibited by adding the foam inhibitor, the volume expansion rate is reduced, the latex is prevented from being sprayed, and the safety of concentration is improved; by adding the mechanical stabilizer and the pH regulator, the stability of the eucommia ulmoides latex can be effectively improved, the phenomenon of latex particle agglomeration is reduced, the stability of a concentration process is improved, and the emulsification efficiency is improved.

In the concentration method, the pH value of the emulsion is preferably adjusted to 8-11 by adding a pH regulator.

In the above concentration method, the vacuum degree of the vacuum environment is preferably-0.03 to-0.08 MPa.

In the concentration method, preferably, the evaporation temperature is 60-90 ℃ and the evaporation time is 2-5 hours.

In the above concentration method, preferably, the evaporation process is assisted by stirring at a speed of 200 to 3000 rpm.

According to the concentration method, the reaction kettle is preferably directly connected with the condensing tower, the condensing temperature is set to be 3-10 ℃, the evaporated water vapor and the residual organic solvent vapor are favorably condensed into liquid water and solvent rapidly when meeting the low-temperature condensing pipe, the vacuum degree in the condensing pipe is increased, the pressure in the guide pipe is reduced, the vapor pressure balance is damaged, the flow speed of the water vapor and the organic solvent vapor is accelerated, the water vapor and the organic solvent can be led out continuously and rapidly, and the concentration efficiency is improved. Liquid water and a small amount of solvent through condensation recovery are easy to stratify because of the specific gravity difference, are convenient for separate, but the water and the solvent cyclic utilization of separation do not influence the emulsification effect to the emulsification process of gutta percha, have reduced manufacturing cost, and can not produce the waste liquid, friendly to the environment.

In the concentration method, preferably, the low-concentration eucommia ulmoides latex is eucommia ulmoides latex from which most of organic solvent and water are removed, and has a solid content of 5-20% and an organic solvent content of 0.5-8%; the solid content of the concentrated eucommia ulmoides latex is 40-80%, and the content of the organic solvent is 0.

In the concentration method, the cooling temperature of the concentrated latex is preferably 20-30 ℃, and the mesh number of the concentrated latex is 200-300.

The preparation method of the low-concentration eucommia ulmoides latex comprises the following steps of: dissolving solid gutta-percha into a glue solution by adopting organic solvents such as petroleum ether, cyclohexane and/or toluene, adding an emulsifier, soft water and a stabilizer, emulsifying by high-speed shearing, and distilling the organic solvent to obtain the low-concentration gutta-percha latex.

Compared with the prior art, the invention has the advantages that:

the concentration method of the invention utilizes the principle that the azeotropic point of water and organic solvent can be reduced in the vacuum degree environment, removes partial water and residual organic solvent in the latex by heating and low-temperature condensation in the vacuum environment, and simultaneously combines the characteristics of the eucommia latex, and adds the synergistic action of the foam inhibitor, the mechanical stabilizer and the pH regulator in the concentration process to ensure that the concentration process is continuously, rapidly and stably carried out. The method is adopted to concentrate the low-concentration eucommia latex, the total solid content of the latex after evaporation concentration can reach 80 percent, an evaporation pipeline is not blocked, the emulsification process is stable, and the concentration efficiency is at least improved by more than 2 times; and because most of water and residual solvent are removed, the content of non-rubber components in the latex is increased, and the components comprise an anti-aging agent, a surfactant and the like, so that the adhesive force, the mechanical stability, the chemical stability and the anti-aging performance of the latex are improved, and the latex has a wide application prospect in some special fields, such as textile dipping and gluing, regenerated leather, carpets, foam products, adhesives, latex cement and the like, and can obtain better service performance.

The method disclosed by the invention can greatly and quickly improve the solid content of the eucommia ulmoides latex, the residual organic solvent in the eucommia ulmoides latex can be thoroughly separated, water and the solvent can be recycled after condensation, the process is simple, the process cost is low, the method is safe and environment-friendly, the technical progress in the eucommia ulmoides latex field can be promoted, the application field of the eucommia ulmoides latex is widened, and the market application requirements can be met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a photograph of a sample of a mattress made of low concentration eucommia ulmoides latex according to example 1 of the present invention;

FIG. 2 is a photograph of a sample of a mattress made of the concentrated eucommia ulmoides latex of example 1 of the present invention.

Detailed Description

In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the 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:

the invention relates to a method for concentrating low-concentration eucommia ulmoides latex, which comprises the following steps:

adding 1000 parts of low-concentration eucommia latex (the solid content is 10 percent and the organic solvent content is 6 percent) with part of organic solvent and water removed into a reaction kettle, adding 1.0 part of mechanical stabilizer potassium laurate, adding pH regulator potassium hydroxide, regulating the pH value to 9.5, adding 0.05 part of foam inhibitor octanol, heating in water bath under the stirring condition, controlling the water bath temperature to be 80 ℃, the stirring speed to be 600r/min, opening a water valve of a condensation pipe, regulating the circulating water temperature to be 8 ℃, regulating the vacuum degree in the reaction kettle to be-0.06 MPa through a piston, evaporating for 3.5 hours, taking out the latex, standing for 24 hours, and filtering by using a nylon cloth with 300 meshes to obtain the concentrated eucommia latex with the solid content of 51 percent and no organic solvent. The concentrated gutta percha latex obtained in this example 1 was tested for various properties, and the test results are shown in table 1.

TABLE 1 Properties of concentrated gutta-percha latex prepared in inventive example 1

As can be seen from Table 1, the method of the present invention for concentrating low concentration eucommia ulmoides latex can greatly increase the solid content of the latex, and the residual organic solvent can be completely separated without affecting other properties of the latex. The low-concentration eucommia ulmoides latex (solid content is 10%) and the concentrated eucommia ulmoides latex (solid content is 51%) of the embodiment are respectively used with natural rubber to prepare the mattress, and the specific formula comprises the following components in parts by weight: 10 parts of eucommia latex, 90 parts of natural rubber, 4.0 parts of zinc oxide, 1.5 parts of an accelerator ZDC, 1.5 parts of an accelerator MZ, 3.0 parts of sulfur, 1.0 part of an anti-aging agent SP and 2.0 parts of a foaming agent potassium oleate. By comparison, when the concentrated eucommia ulmoides latex and the natural latex are used together, the amount of water brought is very small, the total solid content of the composite latex is high, the gelling speed can be increased, the stability of the foam of the foaming sponge is improved, the phenomena of collapse and disappearance of the foam are reduced, the foam string can be effectively avoided, and the uniform and fine foaming is ensured; wherein the photo of the mattress sample prepared from the low-concentration eucommia ulmoides latex is shown in figure 1, and the photo of the mattress sample prepared from the concentrated eucommia ulmoides latex is shown in figure 2; as can be seen from FIGS. 1 and 2, the mattress sample prepared by concentrating the eucommia ulmoides latex has no surface sink and foam.

Example 2:

adding 1000 parts of low-concentration eucommia latex (the solid content is 10 percent and the organic solvent content is 6.5 percent) with part of organic solvent and water removed into a reaction kettle, adding 1.5 parts of mechanical stabilizer potassium laurate, adding a pH regulator potassium hydroxide, regulating the pH value to 11, adding 0.05 part of foam inhibitor octanol, heating in water bath under the stirring condition, controlling the water bath temperature to be 85 ℃, the stirring speed to be 600r/min, opening a water valve of a condensation pipe, regulating the circulating water temperature to be 8 ℃, regulating the vacuum degree in the reaction kettle to be-0.06 MPa through a piston, taking out the latex after 5 hours of evaporation, standing for 24 hours, and filtering by using a nylon cloth with 300 meshes to obtain the concentrated eucommia latex with the solid content of 65 percent and no organic solvent.

The concentrated gutta percha latex prepared in this example 2 was tested for various properties, and the test results are shown in table 2.

TABLE 2 Properties of concentrated gutta-percha latex prepared in inventive example 2

As can be seen from Table 2, the method of the present invention for concentrating low concentration eucommia ulmoides latex can greatly increase the solid content of the latex, and the residual organic solvent can be completely separated without affecting other properties of the latex. The concentrated eucommia ulmoides latex has high solid content and no organic solvent, when the concentrated eucommia ulmoides latex is used together with natural latex, the amount of water brought into the eucommia ulmoides latex is less than that of low-concentration eucommia ulmoides latex, the total solid content of the composite latex is increased, the gelling speed can be increased, the stability of foam sponge foam is improved, the collapse and disappearance phenomena of the foam are reduced, the foam string can be effectively avoided, the uniform and fine foam is ensured, the prepared mattress sample has no depression and foam string phenomena on the surface, and the quality of the foam is higher.

Example 3:

adding 1000 parts of low-concentration eucommia latex (the solid content is 10 percent and the organic solvent content is 6.5 percent) with part of organic solvent and water removed into a reaction kettle, adding 1.5 parts of mechanical stabilizer potassium laurate, adding a pH regulator potassium hydroxide, regulating the pH value to 11, adding 0.08 part of foam inhibitor octanol, heating in water bath under the stirring condition, controlling the water bath temperature to be 87 ℃, the stirring speed to be 2500r/min, opening a water valve of a condenser pipe, regulating the circulating water temperature to be 4 ℃, regulating the vacuum degree in the reaction kettle to be-0.07 Mpa through a piston, taking out the latex after 5 hours of evaporation, standing for 24 hours, and filtering by using a nylon cloth with 300 meshes to obtain the concentrated eucommia latex with the solid content of 80 percent and without the organic solvent.

Comparative example 1:

adding 1000 parts of low-concentration eucommia latex (the solid content is 10 percent, the content of the organic solvent is 6.5 percent) with part of organic solvent and water removed into a reaction kettle, adding 1.5 parts of mechanical stabilizer potassium laurate, adding a pH regulator potassium hydroxide, regulating the pH value to 11, not adding a foam inhibitor, then heating in water bath under the stirring condition, controlling the temperature of the water bath to be 65 ℃, the stirring speed to be 400r/min, opening a water valve of a condenser pipe, regulating the temperature of circulating water to be 20 ℃, regulating the vacuum degree in the reaction kettle to be-0.03 MPa through a piston, evaporating for 15 hours, taking out the latex, standing for 24 hours, and filtering by using 300-mesh nylon cloth to obtain the concentrated eucommia latex with the solid content of 80 percent and the content of the organic solvent of 1 percent.

The concentrated gutta percha latex prepared in the above example 3 and comparative example 1 was tested for various properties, and the test results are shown in table 3.

TABLE 3 Properties of concentrated gutta percha latexes obtained in inventive example 3 and comparative example 1

Item	Example 3	Comparative example 1	Inspection method
				80% total solids Evaporation time h	5	15	GB/T 8298
Number of times of pipeline blockage	0	3	/
				Residue content (mass fraction)/%, maximum	0.12	0.12	GB/T 8293
KOH number, maximum	1.3	1.3	GB/T 8297
				Average particle size (nm), maximum	990	1200	/

As can be seen from Table 3, in comparative example 1, it took 15 hours to concentrate the low concentration eucommia ulmoides having a solid content of 10% to a solid content of 80% without adding a foam inhibitor and without a low temperature condenser tube, and when the concentration temperature was 65 ℃, the pipeline was easily clogged, and the process safety was poor. The method only needs 5 hours for concentration, improves the efficiency by 2 times, and has stable process, safety and reliability and obvious advantages.

Comparative example 2:

the procedure of this comparative example is the same as that of comparative example 2, except that no mechanical stabilizer is added in this comparative example, and the remaining parameters are the same; after evaporation for 20 hours, the latex was taken out and left to stand for 24 hours, and then filtered with a 300-mesh nylon cloth to obtain concentrated gutta percha latex having a solid content of 65% and an organic solvent content of 1%.

Comparative example 3:

the procedure of this comparative example is the same as that of comparative example 2, except that no PH adjuster was added, and the remaining parameters were the same; after 18 hours of evaporation, the latex was taken out and left to stand for 24 hours, and then filtered with a 300-mesh nylon cloth to obtain concentrated gutta percha latex having a solid content of 65% and an organic solvent content of 1%.

The concentrated gutta percha latexes prepared in the above example 2, comparative example 2 and comparative example 3 were tested for various properties, and the test results are shown in table 4.

TABLE 4 comparison of the Properties of concentrated gutta percha latexes prepared in example 3 of the present invention and comparative examples 2 and 3

Item	Example 2	Comparative example 2	Comparative example 3	Inspection method
					Evaporation time of 65% total solids content, h	5	20	18	GB/T 8298
Number of times of pipeline blockage	0	2	2	/
					Average particle size (nm), maximum	990	1400	1300	/
Mechanical stability s, minimum	700	420	530	GB/T 8301

As can be seen from Table 4, concentrating low-concentration eucommia ulmoides latices by the methods of comparative examples 2 and 3 does not completely separate the organic solvent, the concentration efficiency is low, the average particle size of the concentrated eucommia ulmoides latices is increased, the mechanical stability is poor, and the pipeline is easily blocked during emulsification, and the process stability is poor; the method of the invention can not only completely separate the residual organic solvent, but also has high concentration efficiency, continuous and stable concentration process and high safety.

Claims

1. A method for concentrating low-concentration eucommia ulmoides latex is characterized by comprising the following steps:

adding low-concentration eucommia ulmoides latex into a reaction kettle, adding a mechanical stabilizer, a pH regulator and a foam inhibitor, and evaporating and condensing in a vacuum environment to obtain concentrated eucommia ulmoides latex;

the vacuum degree of the vacuum environment is-0.03 to-0.08 MP a; the evaporation temperature is 60-90 ℃, and the evaporation time is 2-5 hours; the reaction kettle is directly connected with a condensing tower, and the condensing temperature is 3-10 ℃.

2. The method according to claim 1, wherein the low-concentration eucommia ulmoides latex is used in an amount of 100 to 1000 parts by weight, the mechanical stabilizer is used in an amount of 0.2 to 1.5 parts by weight, and the antifoaming agent is used in an amount of 0.02 to 1.0 part by weight.

3. The method of claim 2, wherein the suds suppressor is at least one of simethicone, sec-octanol, isomeric methylcyclohexanol, lanolin, stearamide, glycerol monoricinoleate, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, and polyoxypropylene polyoxyethylene glycerol ether; the mechanical stabilizer is potassium laurate and/or ammonium laurate; the pH regulator is sodium hydroxide and/or potassium hydroxide.

4. The concentration method according to claim 1, wherein the pH of the emulsion is adjusted to 8 to 11 by adding a pH adjuster.

5. The concentration method according to claim 1, wherein the evaporation process is assisted by stirring at a speed of 200 to 3000 rpm.

6. The concentration method according to claim 1, wherein the low-concentration eucommia ulmoides latex has a solid content of 5 to 20% and an organic solvent content of 0.5 to 8%; the solid content of the concentrated eucommia ulmoides latex is 40-80%, and the content of the organic solvent is 0.

7. The concentration method according to claim 1, wherein the latex after concentration is cooled to 20 ℃ to 30 ℃ and the mesh number of the screen is 200 to 300.