CN115322210A - Chemically modified zinc glycerolate, preparation method, composition and application - Google Patents
Chemically modified zinc glycerolate, preparation method, composition and application Download PDFInfo
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- CN115322210A CN115322210A CN202110512647.2A CN202110512647A CN115322210A CN 115322210 A CN115322210 A CN 115322210A CN 202110512647 A CN202110512647 A CN 202110512647A CN 115322210 A CN115322210 A CN 115322210A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F3/00—Compounds containing elements of Groups 2 or 12 of the Periodic System
- C07F3/06—Zinc compounds
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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
- C08K5/00—Use of organic ingredients
- C08K5/0091—Complexes with metal-heteroatom-bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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- 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
- C08L2205/24—Crystallisation aids
Abstract
The invention discloses chemically modified zinc glycerolate, which comprises a compound containing a carbon chain and zinc glycerolate, wherein the compound and the zinc glycerolate are bonded together through a chemical bond. The invention also discloses an additive composition and a polymer composition containing the chemically modified zinc glycerolate. The invention also describes a preparation method and application of the chemically modified zinc glycerolate. The chemically modified zinc glycerolate can be used as a polyolefin nucleating agent, realizes a very high crystallization temperature and a very high crystallization speed at a very low addition amount, and can effectively improve the transparency of polypropylene.
Description
Technical Field
The invention relates to the field of synthesis of zinc glycerolate, and in particular relates to modified zinc glycerolate and a preparation method thereof.
Background
In 1970, taylor synthesized, characterized, and described zinc glycerolate for the first time. (Radoslovich, E.W., autopach, M.R., slade, P.G., & Taylor, R.M. (1970) & Crystalline cobalt, zinc, manganese, nd ron alcohols of glycerin. Australian Journal of Chemistry,23 (10), 1963-1971)
U.S. Pat. No. 7,074,949 to microniser et al provides a process for preparing nano zinc glycerols comprising reacting a zinc compound with glycerol, wherein the zinc compound is selected from zinc hydroxide and zinc oxide prepared by calcining zinc hydroxide.
Nucleating agents are special additives which improve mainly the crystallization properties of semicrystalline polymers, such as polypropylene, polyethylene, polyamides, polyethylene terephthalate and polybutylene terephthalate.
Nucleating agents are widely used in polypropylene, including homo-and co-polypropylene, to enhance mechanical properties, accelerate molding efficiency and improve transparency.
When the crystal size of the polypropylene refined by the nucleating agent is smaller than the wavelength of visible light, the visible light can completely penetrate through the polypropylene without changing the direction, and the polypropylene looks transparent, and the nucleating agent is commonly called as a transparent agent in the market.
The nucleating agents on the market are: sorbitol type nucleating agents (e.g., milliken 3988, NX8000, etc.), organophosphorus type nucleating agents such as NA-11, NA-18, NA-21, etc., of ADK company, japan, carboxylate type nucleating agents such as 4030, milliken HPN-68L and HPN-20E, of Classif company, and NA-287 of Basff.
Zinc glycerolate has a long history as a nucleating agent.
U.S. Pat. No. 7,476,713 to Ciba (now Basf) et al discloses a method for dimensional stability of shaped articles made from a composition of polymeric materials containing a nucleating agent in which zinc glycerolate is used as the nucleating agent.
US 2020/0079929 (BASF) also discloses a process for the preparation of zinc glycerolate with incorporated modifier as a nucleating agent for polypropylene, which discloses a process in which monoglyceride is used as modifier and the zinc glycerolate prepared is present in the form of nano-sized microcrystalline agglomerates and is particularly effective in polymers such as polypropylene at low addition levels.
The processes for the production of zinc glycerols of the above-mentioned patent documents use as catalyst a considerable concentration (0.5-1%) of low molecular weight carboxylic acids, such as acetic acid, or zinc salts thereof, such as zinc acetate, which, however, have a certain corrosion of the reaction equipment and, more importantly, need to be removed in a later reaction, otherwise the residual acids affect the stability of the zinc glycerols and, ultimately, their nucleation.
While monoglyceride can be used as an additional additive to polypropylene, monoglyceride, as a low molecular weight substance that can migrate to the surface of the polymer, often affects the surface properties of the polymer, and these altered properties are sometimes good, such as protection from static electricity, but many times are undesirable, such as affecting printing, labeling, etc. of the surface of the final product, and therefore, monoglyceride is not a necessary additive for the resin manufacturer unless specifically required.
Moreover, although the zinc glycerols invented in these documents all show excellent nucleation properties, they have drawbacks of their own which make them impossible to use on a large scale in industry.
For example, ziegler-Natta catalysts are used in the manufacture of polyolefins, and the hydrolysis of such catalysts produces hydrochloric acid (HCl) which can lead to or accelerate the degradation of the polymeric material, or to corrosion of the metal surfaces of the production equipment. Since HCl is classified as a toxic substance, release of small amounts of hydrochloric acid to the environment must be avoided. Calcium stearate is generally used in industry as an acid absorbent, and zinc in glycerol zinc and calcium in calcium stearate are subjected to exchange reaction, so that the function of glycerol zinc as a nucleating agent is destroyed, and therefore, when glycerol zinc is used as the nucleating agent, the nucleating effect is often found to be very poor.
Another common problem is the storage stability of zinc glycerols. As a nucleating agent, zinc glycerolate is generally pulverized into an extremely fine powder, thereby ensuring that it can be sufficiently and uniformly dispersed in a polypropylene resin upon addition to polypropylene. Therefore, it is important to maintain the homogeneity and stability of the zinc glycerolate particles during manufacture, transport and storage. Dispersing agents are often added to the zinc glycerolate to ensure that the zinc glycerolate crushed during the crushing process does not re-agglomerate, but the dispersing agents generally have strong hygroscopicity, and moisture absorption can cause the zinc glycerolate to agglomerate and agglomerate during storage, thereby influencing the use of the nucleating agent.
Although zinc glycerolate often exhibits very good nucleation effects, all of these problems seriously affect its use on a large scale in industry.
Disclosure of Invention
Therefore, the present invention is to provide a chemically modified zinc glycerolate to provide excellent calcium stearate compatibility and storage stability, a method for preparing the same, a composition containing the same, and applications thereof.
The technical scheme of the invention is that the chemically modified zinc glycerolate has the following structure:
R X Z
wherein Z is a zinc-glycerol complex,
r is selected from alkyl with 3-100 carbon atoms, saturated or unsaturated, benzene ring or no benzene ring, heterocycle or no heterocycle;
x comprises at least one of the following groups:
x refers to a functional group that links R and Z, and X connects R and Z through one or more chemical bonds.
In the chemically modified zinc glycerolate structure according to the present invention, R is a hydrocarbon group having 3 to 100 carbon atoms, which may be a saturated hydrocarbon group or an unsaturated hydrocarbon group, may or may not have a phenyl group, and may or may not have a cycloalkyl group.
According to the chemically modified zinc glycerolate, the functional group X at least contains an ester group (-COO-), a sulfonic acid group (-SO-) 3 -), an amine group (-NH-), or an ether group (-O-).
Preferably, Z is a zinc-glycerol complex, and R is a group containing at least one hydrocarbon group having 3 to 100 carbon atoms.
According to one embodiment of the invention, the chemically modified zinc glycerolate has the following structure:
according to another embodiment of the present invention, the chemically modified zinc glycerolate has the following structure:
according to another embodiment of the present invention, the chemically modified zinc glycerolate has the following structure:
in the formula, X is
The connection condition of R is as follows:
in this case Z is linked by two chemical bonds.
According to another embodiment of the present invention, the chemically modified zinc glycerolate has the following structure:
wherein Z is a zinc-glycerol complex, and R is a group containing at least one hydrocarbon group having 3 to 100 carbon atoms.
The invention also provides an additive composition containing chemically modified zinc glycerolate, which at least comprises the chemically modified zinc glycerolate and at least one additive.
The additive is selected from: antioxidant, acid neutralizer, ultraviolet stabilizer, slipping agent, antistatic agent and opening agent.
The invention also provides a polymer composition containing chemically modified zinc glycerolate, which comprises the additive composition containing chemically modified zinc glycerolate and a polymer. At least comprising the chemically modified zinc glycerolate described above and at least one of the following polymers: polyolefins, polyvinyl chloride, polyamides and polyesters.
The invention provides a polymer composition containing chemically modified zinc glycerolate, wherein the preferred polymer is polyolefin; more preferred polymers are polypropylene and polyethylene.
Preferably, in the polymer composition containing chemically modified zinc glycerolate provided by the invention, the weight of the chemically modified zinc glycerolate accounts for 0.001-10% of the total weight of the composition. A more preferable range is 0.005 to 5%.
The invention also provides a preparation method of the chemically modified zinc glycerolate. Mixing glycerol, zinc-containing compound and RX compound in a reactor with stirring, heating to 100-240 deg.C, and holding for 2-20 hr to obtain flowable powder, which is chemically modified zinc glycerolate. The catalyst and the target product are bound together by chemical bonds and do not need to be removed in the final product.
RX Compound means a compound comprising at least one hydrocarbyl group R according to claim 1 and one functional group X according to claim 1.
Preferably, the ratio of the zinc atoms in the zinc-containing compound to the charged moles of glycerol is 0.95 to 6; the molar ratio of zinc atoms in the RX compound and the zinc-containing compound is 0.01-1.
According to the method for preparing the chemically modified glycerozinc composition of the present invention, preferably, the zinc-containing compound includes zinc oxide, zinc carbonate, zinc hydroxide, and basic zinc carbonate.
According to the preparation method of the chemically modified zinc glycerolate composition, a solvent is preferably added in the preparation of the zinc glycerolate. A solvent may be used or no solvent may be used. An excess of glycerol may or may not be used as a solvent.
Further, the solvent may be water, ethanol, methanol, cyclohexane, n-hexane, toluene, or the like.
According to the method for preparing the chemically modified zinc glycerolate composition of the present invention, preferably, the RX compound comprises: a saturated or unsaturated carboxylic acid or zinc carboxylate having 5 to 100 carbon atoms, a saturated or unsaturated sulfonic acid or zinc sulfonate having 5 to 100 carbon atoms, a saturated or unsaturated alcohol having 5 to 100 carbon atoms, and a saturated or unsaturated amine having 5 to 100 carbon atoms, or a combination thereof.
The invention also provides application of the composition containing the zinc glycerolate in nucleating agents and plastic products.
The additive composition containing chemically modified zinc glycerolate can be applied to nucleating agents and plastic products. The polymer composition containing the chemically modified zinc glycerolate can be applied to nucleating agents and plastic products.
The current synthesis of zinc glycerolate is carried out using low doses of small molecular weight acids (e.g. acetic acid) which are basically bound to zinc to form a soluble or meltable reactive intermediate which is then reacted with glycerol to produce zinc glycerolate, the general belief being: these catalysts are not required components in the final product and because they affect the stability of zinc glycerolate due to reversible reactions, current processes remove these small molecular weight acids at the final stage of synthesis.
Conventional catalysts are usually added in small amounts, which is important for their catalytic efficiency, and the catalyst only acts as an intermediate (intermediate) for the reaction, not as a final product, and usually this intermediate is reversible, thereby affecting the stability of the final product, and therefore, conventional catalysts require introduction of a catalyst removal or deactivation process at the final stage of synthesis.
The catalyst used in the invention is finally combined with the zinc glycerolate through chemical bonds, and the zinc glycerolate does not need to be removed in a subsequent process, so that the catalyst can be used in a large amount, and the reaction speed is accelerated by adding the catalyst in the large amount. More importantly, the chemically modified zinc glycerolate can have special functional groups, so that the compatibility and the dispersibility of the zinc glycerolate in a target polymer can be effectively improved, and the efficiency is improved.
The invention finds that the process of the zinc glycerolate prepared by the method is simpler, the obtained zinc glycerolate is very effective to polymers such as polypropylene at very low addition amount, the transparency of the polypropylene is greatly improved, and the zinc glycerolate has excellent compatibility and good storage stability to calcium stearate which is an acid absorbent commonly used by the polypropylene. In addition, the zinc stearate is a common additive used by resin manufacturers, and the introduction of the zinc stearate does not influence other properties of the polymer.
Drawings
FIG. 1 is DSC data for example 1, comparative example 6 and comparative example 7.
FIG. 2 is a Fourier infrared plot of example 1, comparative example 6, and comparative example 7.
Detailed Description
1. Preparation of chemically modified zinc glycerolate
Example 1
5mol of glycerol, 5.1mol of zinc carbonate and 0.2mol of stearic acid are added to a 2L horizontal reactor with stirring, the temperature is raised to 170 ℃ with stirring, after 2 hours of holding, after all the paste is turned into a flowable powder, the powder is taken out and weighed to obtain 814 g of white powder, the melting point is tested by DSC, the infrared absorption spectrum is tested by FTIR, and the rest is pulverized by a pulverizer for standby.
Example 2
Adding 5mol of glycerol, 5.2mol of zinc carbonate and 0.4mol of dodecyl sulfonic acid into a 2L horizontal reactor with stirring, heating to 170 ℃, keeping for 2 hours, taking out and weighing after all pulp becomes flowable powder to obtain 802 g of white powder, and crushing by a crusher for later use.
Example 3
Adding 5mol of glycerol, 5.3mol of zinc carbonate and 0.6mol of benzoic acid into a 2L horizontal reactor with stirring, heating to 170 ℃, keeping for 2 hours, taking out and weighing after all pulp becomes flowable powder to obtain 785 g of white powder, and crushing by a crusher for later use.
Example 4
Adding 5mol of glycerol, 5.1mol of zinc carbonate and 0.4mol of erucic acid into a 2L horizontal reactor with stirring, heating to 170 ℃, keeping for 2 hours, taking out and weighing to obtain 820 g of white powder after all pulp becomes flowable powder, and crushing by a crusher for later use.
Example 5
Adding 5mol of glycerol, 6mol of zinc carbonate and 2mol of 1, 2mol of hexanediol into a 2L horizontal reactor with stirring, heating to 170 ℃, keeping for 2 hours, taking out and weighing after all pulp becomes flowable powder to obtain 781 g of white powder, and crushing by a crusher for later use.
Comparative example 6:
adding 5mol of glycerol, 5mol of zinc oxide and 10mol of acetic acid into a 2L horizontal reactor with stirring, continuously stirring and heating to 200 ℃, keeping for 12 hours to obtain white flowable powder, taking out and weighing to obtain 754mol of powder with the melting point higher than 300 ℃, and crushing by a crusher for later use.
Comparative example 7:
425mol of zinc glycerolate prepared according to the method of comparative example 1 and 75mol of zinc stearate are mixed, 500mol of water are added, grinding is carried out in a sand mill for 30 minutes, and then drying is carried out, thus obtaining 470mol of white solid which is crushed by a crusher for standby.
Comparative example 8:
zinc glycerolate was obtained according to the procedure of example 1 of patent CN 110678510A.
ZnO (656.4 g) and GMS (72.3 g) were homogenized and heated in a Z-blade mixer. 668.5g of glycerol were then added. Then 74.3g glycerol +8.7g water +4.5g 90% acetic acid were added and further homogenized. The temperature was raised to 110 ℃. Once the reaction is complete, i.e. the powder is finely dried, the heat is turned off. The maximum temperature reached is about 120 ℃ but the temperature during the reaction is essentially in the range of 100-120 ℃. Mixing is continued in this temperature range after the reaction is complete, during which time agglomerated products are formed. The resulting agglomerated (powder) product was needle milled.
2. Chemically modified zinc Glycerol test
2.1.DSC melting Point test
Differential Scanning Calorimetry (DSC) is a thermal analysis technique in which the difference in heat required to increase the temperature of a sample and a reference sample is measured in terms of temperature. The sample and the reference sample were kept at almost the same temperature throughout the experiment. Typically, the temperature program for DSC analysis is designed such that the sample rack temperature increases linearly with time. The rationale for this technique is that when a sample undergoes a physical transition such as a phase change, more or less heat will be required to flow to the sample to maintain the same temperature as compared to a reference sample. The amount of heat that must flow to the sample is either small or large depending on whether the process is exothermic or endothermic. For example, when a solid sample melts into a liquid, more heat will be required to flow to the sample, increasing the temperature at the same rate as the reference. This is due to the heat absorbed by the sample when it undergoes an endothermic phase change from solid to liquid. Also, as the sample undergoes an exothermic process (e.g., crystallization), less heat is required to increase the sample temperature. By observing the difference in heat flow between the sample and the reference sample, the differential scanning calorimeter is able to measure the amount of heat absorbed or released during such a transition, thereby determining the melting point of the substance very accurately. As such, DSC can be used to assess sample purity and is therefore widely used as a sample detection tool in an industrial setting.
The melting points of the samples of example 1, comparative example 6 and comparative example 7 were measured by DSC, and the results are shown in fig. 1. Melting point measurement of DSC, wherein the chemically modified zinc glycerolate no longer has the melting point of zinc stearate, and no other melting peak below 230 degrees celsius, which shows that zinc stearate does not exist as a simple substance, but is bonded with zinc glycerolate in a certain chemical bond form.
2.2. Fourier transform infrared analysis
Fourier Transform Infrared (FTIR) is a technique used to obtain infrared absorption and emission spectra of solids, liquids or gases. As infrared radiation passes through the sample, some of the radiation is absorbed by the sample and some passes (is transmitted). The signal generated on the detector is a spectrum representing a "fingerprint" of the sample molecules. Since different chemical structures (molecules) produce different spectral fingerprints, a particular chemical structure can be determined by virtue of a particular spectral fingerprint. Samples of example 1, comparative example 6 and comparative example 7 were subjected to fourier infrared testing and the results are shown in figure 2. The peaks of the absorption peaks corresponding to 1540 and 1399 are unique to zinc stearate, the peaks at 1540 and 1399 of chemically modified zinc glycerolate disappear, and a new absorption peak appears at 1735, indicating that zinc stearate does not exist alone in zinc glycerolate, but a new chemical bond is formed.
2.3. Performance testing by incorporation into polymers (Polypropylene)
2.3.1. The nucleating agent and the polypropylene are mixed and granulated,
1 kg of polypropylene resin, T30S petrochemical-produced and samples manufactured according to each proportion and example in the amounts specified in the following table were mixed by a high-speed mixer, and then extruded and pelletized by a co-rotating twin-screw extruder and cut into 4mm long particles at an extrusion temperature of 200 ℃. And naturally drying the obtained plastic particles.
2.3.2. Haze test specimens were prepared.
The sheet of 51MM × 76MM × 1MM is molded by an injection molding machine at 200-230 deg.C, and the mold temperature is controlled at 45 deg.C. The resulting sheet was tested for sample haze according to ASTM D1003. The test results are shown in Table 2.
Nucleation efficiency test
The crystallization temperature is an important measure of the crystallization efficiency of nucleating agents, and the crystallization temperature of a sample is usually measured by DSC. Under the condition that the cooling rate is 10 degrees centigrade per minute, the crystallization temperature of the common homopolymerized polypropylene is 108 degrees centigrade. Generally, the nucleating agent is added to effectively increase the crystallization temperature of the polypropylene and accelerate the crystallization speed, thereby shortening the injection molding cycle. The test standard for measuring the crystallization temperature of a polymer by using the DSC method is ASTM D792. In order to measure the crystallization temperature, the target polymer is added to 220 ℃ from 60 ℃ at a speed of 10 ℃ per minute and is kept for 2min, and then is cooled to 60 ℃ at 10 ℃ per min. The test results are shown in table 1 below.
Haze test: the sheet of 51MM × 76MM × 1MM is molded by an injection molding machine at 200-230 deg.C, and the mold temperature is controlled at 45 deg.C. The resulting sheet was tested for sample haze according to ASTM D1003. The test results are shown in Table 1.
Table 1 the data shows: when the addition amount of zinc glycerolate is 0.1% and the addition amount of calcium stearate is 0.05%, the crystallization temperatures of example 1, comparative example 6 and comparative example 8 are relatively close, but when the addition amount of zinc glycerolate is reduced to 0.05%, the crystallization temperature of example 1 is significantly higher than that of comparative example 6 and comparative example 8, and the haze of the transparency index is significantly lower than that of comparative example 6 and comparative example 8, showing that chemically modified zinc glycerolate significantly improves the compatibility with calcium stearate.
Another important indicator of nucleation efficiency is the crystallization half-life (T) 1/2 ). To measure T 1/2 The polypropylene composition was heated from ambient temperature to 230 ℃ and held for 2 minutes, then rapidly cooled to 140 ℃ and held. The time taken for half of the crystallization to be completed was measured. Shorter T 1/2 Indicating a higher nucleation efficiency and requiring a shorter cycle time in injection molding and therefore of significant value.
Table 2 shows that, compared to comparative example 6 and comparative example 8, chemically modified zinc glycerolate of the present invention, example 1, has the shortest semicrystallization time, and shows excellent compatibility with calcium stearate, especially at low dosages.
Compatibility and acid resistance testing of calcium stearate
It is well known that acidic by-products, such as hydrochloric acid (HCl) produced by the hydrolysis of ziegler-natta catalysts, can be formed during the manufacture or processing of polyolefins and can cause or accelerate the degradation of polymeric materials or cause corrosion of metal surfaces of production equipment. Since HCl is classified as a toxic substance, release of small amounts of hydrochloric acid into the environment must be avoided. Calcium stearate is the most used acid scavenger in polypropylene.
Zinc glycerate is more reactive with hydrochloric acid (HCl) than calcium stearate, which impairs its function as a nucleating agent.
In this test, nucleating agents were tested in both calcium stearate-containing and calcium stearate-free formulations.
Table 3 the data show that chemically modified zinc glycerolate of example 1 of the present invention still shows very high crystallization temperature and very short crystallization half time without calcium stearate compared to comparative example 6 and comparative example 8, showing that chemically modified zinc glycerolate of the present invention has excellent calcium stearate compatibility and acid resistance.
Moisture absorption test
Moisture absorption tests were performed with the nucleating agent powder. After drying the nucleating agent in a vacuum oven at 90 ℃ for 24 hours, 10 grams of each sample was placed on a 5mm thick glass and then the samples were placed in an environment of controlled humidity (50%) and temperature (21 ℃) and weighed daily, the percentage of weight increase being defined as the percentage of moisture absorption.
Table 4 shows that the chemically modified zinc glycerolate of the present invention significantly reduces the moisture absorption rate of zinc glycerolate, and reduces the risk of glycerin agglomeration due to moisture absorption.
Although the present invention has been described with reference to particular synthetic methods, processes, formulations and methods of use of chemically modified zinc glycerols, these synthetic methods, processes, formulations and methods of use are merely examples set forth for purposes of illustrating the patent and are not intended to limit the scope of the invention.
Claims (10)
1. A chemically modified zinc glycerolate characterized by the following structure:
R X Z
wherein Z is a zinc-glycerol complex;
r is selected from alkyl with 3-100 carbon atoms, saturated or unsaturated, benzene ring or no benzene ring, heterocycle or no heterocycle;
x comprises at least one of the following groups:
-NH-，-0-
x is a functional group that links R and Z, and X is linked to R and Z by one or more chemical bonds.
2. A chemically modified zinc glycerolate according to claim 1, wherein: r is a group containing at least one hydrocarbon group having 3 to 100 carbon atoms.
3. An additive composition containing chemically modified zinc glycerolate, characterized in that: at least comprising the chemically modified zinc glycerolate of claim 1 and at least one additive.
4. A polymer composition comprising a chemically modified zinc glycerolate, characterized in that: comprising the chemically modified zinc glycerolate-containing additive composition and the polymer of claim 3.
5. The polymer composition containing chemically modified zinc glycerolate according to claim 4, wherein the weight of said chemically modified zinc glycerolate is 0.001% -10% of the total weight of the composition.
6. The polymer composition containing chemically modified zinc glycerolate according to claim 4, wherein said polymer is one or more of polyolefin, polyvinyl chloride, polyamide or polyester.
7. A method of preparing the chemically modified zinc glycerolate of claim 1, wherein: mixing glycerol, zinc-containing compound and RX compound in a reactor with stirring, heating to 100-240 deg.C, and holding for 2-20 hr to obtain flowable powder, wherein the obtained product is chemically modified zinc glycerolate.
8. The method of preparing a chemically modified zinc glycerolate composition according to claim 7, wherein: the zinc-containing compound includes zinc carbonate, zinc hydroxide, zinc oxide, and basic zinc carbonate.
9. The method of preparing a chemically modified zinc glycerolate composition according to claim 7, wherein: the RX compound includes: saturated or unsaturated carboxylic acid having 5 to 100 carbon atoms, saturated or unsaturated sulfonic acid having 5 to 100 carbon atoms, saturated or unsaturated alcohol having 5 to 100 carbon atoms, and saturated or unsaturated amine having 5 to 100 carbon atoms.
10. Use of the composition of claim 3 or 4 in nucleating agents and plastic articles.
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