CN101735532A - High weather-proof, multiple-effect, environmentally-friendly PVC composite heat stabilizer and preparation method thereof - Google Patents
High weather-proof, multiple-effect, environmentally-friendly PVC composite heat stabilizer and preparation method thereof Download PDFInfo
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- CN101735532A CN101735532A CN200910231399A CN200910231399A CN101735532A CN 101735532 A CN101735532 A CN 101735532A CN 200910231399 A CN200910231399 A CN 200910231399A CN 200910231399 A CN200910231399 A CN 200910231399A CN 101735532 A CN101735532 A CN 101735532A
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Abstract
The invention discloses a high weather-proof, multiple-effect, environmentally-friendly PVC composite heat stabilizer which is composed of the following raw materials in percentage by weight: 20-40% of calcium stearate, 15-25% of zinc stearate, 10-30% of hydrophobicity nano-hydrotalcite, 1-1.5% of hyperdispersant, 5-15% of lubricating agent, 4-7% of surface modifier and 5-15% of assistant heat stabilizer, wherein, hydrophobicity nano-hydrotalcite is prepared with a coprecipitation method by adding sodium oleate, and the molar ratio of Mg to AL in hydrophobicity nano-hydrotalcite is 2-3:1; the hyperdispersant is copolymer of maleic anhydride-sodium allyl sulfonate-crylic acid polyethylene glycol monoester. The nano-hydrotalcite prepared by the invention has better hydrophobic property and favorable compatibility with PVC matrix. Hydrophobicity nano-hydrotalcite and hyperdispersant are added to lower balancing torque, improve handling characteristics and weather resistance and lower cost. The preparation method of the invention has no pollution and low energy consumption.
Description
Technical field
The present invention relates to utilize hydrophobic nanometer hydrotalcite and have the composite thermal stabilizer of the PVC of the diffusing effect of oversubscription with the hyper-dispersant preparation with long-acting thermostability.
Background technology
As everyone knows, PVC easily decomposes under the processing temperature condition, must add stablizer and just can make its smooth processing.In addition, polyvinyl chloride is heated or when being subjected to ultraviolet radiation, also can causing the degraded of polymkeric substance and take off HCl.Therefore, PVC's uses and processes and must use stablizer.Stablizer is a kind of chemical assistant, and it can suppress degraded and the variable color that PVC causes owing to heat, light action in machine-shaping and use.Stablizer can be divided into base lead salt stablizer, metallic soap class, organo-tin compound, organic stabilizer and one package stabilizer five big classes by its chemical structure.
Because advantages such as the lead salt stabilizer raw material is easy to get, production technique is simple, cheap, performance is outstanding are still most widely used kind so far, output accounts for 65% of China's stablizer output.The shortcoming of lead salt stabilizer is toxicity height, coloring plastic difficulty, the bad dispersibility in plastics etc., and particularly the powdery lead compound produces a large amount of lead salt dust in batching, stirring or plasticizing process, can produce greatly harm to operator and environment.In order to overcome these shortcomings, adopt complex lead salt stabilizer mostly.Complex lead salt stabilizer is compared with traditional three salt, disalt, and performance improves a lot, and it with strong points, simple to operate reduced the processing technology that is mixed, thereby reduced dust pollution, reduced cost.In a word, complex lead salt stabilizer is celebrated with its excellent combination property.The complex lead salt stabilizer part that also comes with some shortcomings, poor as bad dispersibility with PVC base-material consistency, produce white point in the finished product of being everlasting, have a strong impact on section quality.Problems such as also there is painted ability in complex lead salt stabilizer, and versatility is not high.
(Layered Double Hydrotalcides is the negatively charged ion stratiform functional inorganic materials that a class has laminate structure LDHs) to hydrotalcite, but has chemical constitution and the particular structure and the performance of modulation.Its typical magnalium hydrotalcite chemical formula is: [Mg6Al2 (OH) 16CO3] 4H2O.The hydrotalcite tool integrates all multi-functional fillings and improved starting material such as fire retardant, insulating compound, stablizer, tinting material, surface slip agent, antiaging agent, anti UV agent.The performance of hydrotalcite: (1) magnalium hydrotalcite is the good environment friendly flame retardant of efficient, nontoxic, low cigarette, high performance-price ratio.Hydrotalcite has magnesium hydroxide and similar structure of aluminium hydroxide and composition concurrently, discharges a large amount of water and carbonic acid gas during decomposes, and absorbs a large amount of heat, can reduce the temperature of combustion system; Decompose water vapor and the dilution of carbon dioxide gas physical efficiency that discharges and intercept inflammable gas; The carbide that forms when magnesium aluminum oxide that thermolysis generates and macromolecular material burning forms protective membrane at material surface, thereby has intercepted the further intrusion of oxygen, also plays flame retardant effect.Solid product after hydrotalcite particle is decomposed has very big specific surface area and very strong alkalescence, and sour gas and the smog that discharges during absorbing material thermolysis in time also is transformed into corresponding compounds, thereby plays the effect that presses down cigarette and smoke elimination.Therefore hydrotalcite is the nontoxic halogen-free flame retardants new variety of environment amenable Smoke Suppression that get a good chance of.Its flame retardant properties obviously is better than aluminium hydroxide and magnesium hydroxide, and has both advantages concurrently.(2) hydrotalcite is nontoxic heat stable material.LDHs can be used as efficient, nontoxic, the inexpensive thermo-stabilizer of polyvinyl chloride (PVC).It can absorb PVC effectively and decompose the HCl that produces in processing and use, improves processing conditions and the thermostability of PVC.Can with organotin or plumbous zinc jointly as thermo-stabilizer, or use jointly with other auxiliary agents, further improve the thermostability of PVC.LDHs itself is nontoxic, can replace lead salt and other metal species stablizers on a large scale, and can be used among the food product pack PVC.(3) hydrotalcite and other preparation are used with, except the thermotolerance that can improve macromolecular material, can also improve their other performance.As physical strength, anti-aging temperature, product surface brightness, insulating property, antistatic property, anti-ultraviolet property etc.Hydrotalcite also has good thermal insulation, promotes the PVC plastic sheeting for farm use to ultrared absorption, improves the heat retaining property of plastic sheeting for farm use.The purposes of hydrotalcite: (1) is as multi-functional filling improving agents such as fire-retardant, stable, the insulation of macromolecular materials such as plastics, rubber, chemical fibre, painted, uvioresistants.(2) as dyestuff, coating, paint, printing ink, makeup daily-use chemical industry starting material.(3) as dyeing and weaving thing waste water conditioner, radioactive wastewater treatment agent, removing pollutant flocculation agent.(4) as chemical catalyst carrier and aromatized catalyst.(5) as the improving agent and the intermediate of multiple material.
Nano hydrotalcite has high specific surface, and the more conventional hydrotalcites of performance such as its flame retardant resistance, adsorptivity, stability all have remarkable lifting, are a kind of very promising functional materials.Existing many about the patent of nano hydrotalcite preparation, as " a kind of is the method (patent No. ZL 03150037.4) of feedstock production nano level magnesium aluminum-hydrotalcite with bittern ", after this patent removes the processing of impurity and coloring matter with industrial bittern, utilize magnesium salts wherein to prepare nano hydrotalcite, can suitably reduce the production cost of hydrotalcite; Patent " the chloride superpolymer composite thermal stabilizer of a kind of hydrotalcite (patent No. ZL200410037656.7) " mainly is to have prepared nano hydrotalcite, and has synthesized the PVC composite thermal stabilizer with hydrotalcite and calcium soap, the zinc soap of preparation.The preparation method of existing multiple nano hydrotalcite, but the hydrotalcite of preparation is hydrophilic.Organic substance consistencies such as hydrophilic hydrotalcite and polyvinyl chloride are bad, are difficult to uniform mixing, and easily separate out, and make that the one package stabilizer stabilising effect is undesirable, greatly limited the effect of hydrotalcite in the PVC composite thermal stabilizer.
The PVC that occurs on the world market mainly is the Solsperse series product of ICI company with hyper-dispersant at present, wherein, Solsperse 3000 (the domestic corresponding trade mark is WL-1) and Solsperse 13650 (the domestic corresponding trade mark is WL-3) are the typical case representative of PVC with hyper-dispersant.The solvent chain of these two kinds of hyper-dispersants is low polar polyester chain and hydrocarbon chain, and they and polyolefins plastics and softening agent thereof have good consistency.The application of hyper-dispersant aspect plastic working,
Focus mostly on aspect coloring plastic, as increase organic or inorganic dispersing of pigments, but seldom the handlebar hyper-dispersant is applied to polyvinyl-chloride use lead salt one package stabilizer aspect.
Summary of the invention
Technical problem to be solved by this invention provides a kind of high weather-proof, multiple-effect, environmentally-friendly PVC composite heat stabilizer and preparation method thereof, utilize hydrophobic nanometer hydrotalcite and PVC composite thermal stabilizer with hyper-dispersant, overcome the shortcoming of above-mentioned complex lead salt stabilizer, the nontoxic one package stabilizer that the preparation height is weather-proof, dispersed, consistency is strong, prepared one package stabilizer stabilising effect is good.
High weather-proof, multiple-effect, environmentally-friendly PVC composite heat stabilizer of the present invention is characterized in that being made up of the raw material of following mass percent:
Calcium stearate 20～40%
Zinic stearas 15～25%
Hydrophobic nanometer hydrotalcite 10～30%
PVC hyper-dispersant 1～1.5%
Lubricant 5～15%
Surface modifier 4～7%
Auxiliary heat stabilizer 5～15%
More than the mass percent summation of each raw material be 100%.
Wherein said hydrophobic nanometer hydrotalcite makes according to following steps:
(1) obtain solution A:2 * 10
-3The aqueous solution sodium oleate of mol/l;
(2) obtain solution B: with magnesium salts and aluminium salt in molar ratio 2～3: 1 mixed be mixed with Mg
2+Concentration is the aqueous solution of 0.3～0.6mol/L;
(3) obtain solution C: with KOH or NaOH and Na
2CO
3Or K
2CO
3Press OH
-/ CO
3 2-Mol ratio 12～16: 1 mixed obtain solution C;
(4) get the 500ml solution A and put into the 2L three-necked flask, heating in water bath to 40～60 ℃, under intense stirring condition, drip solution B and the solution C of 400～500ml simultaneously, rate of addition is for dropwising in 30～45min, the pH value of solution value remains on 9.0～9.5 in the dropping process, dropwise and continue to stir 30min, bath temperature to 60～80 ℃ insulation 2～3h then raises, naturally cool to room temperature, repeatedly suction filtration, washing precipitation to the pH value 7～8, precipitation dissolving again, add 10～20g NaH
2PO
4With 200ml toluene, standing demix behind the vigorous stirring 30min, precipitation is transferred to toluene, discards lower aqueous solution, and toluene is removed in distillation, has both got hydrophobic nanometer hydrotalcite.The hydrophobic nanometer hydrotalcite particle diameter of preparation is 30～70nm.
The PVC hyper-dispersant makes according to following steps:
The preparation of the first step polyalkylene glycol acrylate monoesters: in there-necked flask, add a certain amount of polyoxyethylene glycol, Witco 1298 Soft Acid, Resorcinol, begin to add vinylformic acid in the time of 110～120 ℃, after dropwising, in 120 ℃ of constant temperature 2.5h.The reaction solution decompression is steamed water byproduct, react 2h under this temperature, the speed of deviating from moisture obviously slows down; 130 ℃ of constant temperature, to vacuum reaction get the amount of water outlet and theoretical value near the time be reaction end; Be cooled to below 40 ℃ under vacuum condition, discharging gets finished product.
The preparation of second step maleic anhydride-propenyl sodium sulfonate-polyalkylene glycol acrylate monoester copolymer: in there-necked flask, add distilled water, maleic anhydride, heated and stirred makes its dissolving, when reaching 60 ℃, temperature begins to add propenyl sodium sulfonate and polyalkylene glycol acrylate monoesters solution, add 0.5～1.5wt% persulphate simultaneously, be warming up to 85 ℃ of reaction 3～5H after dripping, discharging is the target hyper-dispersant.
Select polyethylene wax, Tegin 55G or stearic acid at lubricant described in the above-mentioned composition, surface modifier is selected pentaerythritol ester or triphenyl phosphite, and auxiliary heat stabilizer is selected epoxy soybean oil or diphenylpropane-1,3-dione(DPPO).
High weather-proof, multiple-effect, environmentally-friendly PVC with the preparation method of thermo-stabilizer is: earlier calcium stearate, Zinic stearas, hydrophobic nanometer hydrotalcite and hyper-dispersant are added thorough mixing in the reactor, get mixture, add heating and stirring in the kneader, add surface modifier, mediate 20min down at 100～110 ℃, in kneader, add lubricant and composite thermal stabilizer then, mediate and stir 30min, discharging compressing tablet, screening, packing had both got the finished product.
The present invention adopts the method for co-precipitation, and add sodium oleate and prepare Mg: the Al mol ratio is 2～3: 1 hydrophobic nanometer hydrotalcite, under the consisting of phase-transferring agent effect, uses toluene that hydrophobic nanometer hydrotalcite is extracted; Mix with hyper-dispersant, calcium stearate, Zinic stearas, add lubricant, surface modifier and auxiliary stabilizer again and make the high weather-proof, multiple-effect, environmentally-friendly PVC thermo-stabilizer.
The prepared nano hydrotalcite hydrophobic effect of the present invention is good, and is good with the organic solvent mutual solubility, as the stablizer of plastic workings such as PVC, have be difficult for separating out, characteristics that stabilising effect is good.The hydrophobic nanometer hydrotalcite that adds the present invention's preparation can reduce the balancing torque of PVC goods, improves processing characteristics and weathering resistance, reduces cost.By the PVC that adds the hydrophobic nano-hydrotalcite composite thermal stabilizer being carried out the static-aging experiment, the result shows, adds the thermostability that one package stabilizer of the present invention can obviously improve PVC.Under 180 ± 1 ℃ of conditions, PVC not only has good initial coloring, and its heat-stable time has also reached more than 120～200min.Preparation method of the present invention is pollution-free, energy consumption is low; Hyper-dispersant is a kind of tensio-active agent that contains carboxyl graft copolymer molecular structure, and this hyper-dispersant comprises hydrophobic and hydrophilic two portions.The hydrophilic radical of hyper-dispersant is by surfactivity effect, complexing action, electrostatic repulsion forces and steric repulsion power etc., make PVC with one package stabilizer particularly wherein inorganics produce the oversubscription effect of loosing.This hyper-dispersant hydrophobic group and common
Poly-long chain molecule structure and polyvinyl chloride molecule avidity height make that one package stabilizer is easy to disperse in PVC, thereby produce the diffusing effect of oversubscription.Avoid in the PVC course of processing, occurring one package stabilizer caking and phenomenon such as separate out.Because stablizer of the present invention is modified the intermediate lead salt stabilizer with hyper-dispersant in recombination process, can greatly improve the dispersiveness and the consistency of stablizer, avoids stablizer the spot phenomenon to occur in the section bar course of processing.Because of lead salt stabilizer under the hyper-dispersant effect, particle is less, and good dispersity, can play preferably to absorb HCl effect, so can reduce the consumption of lead salt greatly, thereby reduce production costs.In addition, the use of hyper-dispersant also can improve PVC matrix and dispersing of pigments consistency, thereby the diffusing dustless complex lead salt stabilizer of this new modified oversubscription is the new stable agent of all excellent property in the PVC plastic working process.By GB GB2113-82 " plastics whiteness experimental technique ", three kinds of PVC plastics by the preparation of embodiment table 2 are carried out heat-resisting whiteness test, table 3 is that being placed on test piece with whiteness is the relative whiteness value of testing in the whiteness instrument checked of 85% standard white body.Can find that from table 3 prepared new modified one package stabilizer is compared with traditional stablizer, has outstanding thermostability.Preparation method of the present invention is pollution-free, energy consumption is low.
Embodiment
Embodiment 1:
Preparation 2 * 10
-3Mol/l aqueous solution sodium oleate (solution A) takes by weighing 98.59g MgSO respectively
47H
2O and 66.64gAl
2(SO
4)
318H
2O is dissolved in the 500ml deionized water and is mixed with Mg
2+And Al
3+2: 1 in molar ratio mixing solutions (solution B) is with 48.00g NaOH and 10.60g Na
2CO
3Be dissolved in the 500ml deionized water and be mixed with OH
-/ CO
3 2-12: 1 mixing solutions of mol ratio (solution C).Get the 500ml solution A and put into the 2L three-necked flask, heating in water bath to 40～60 ℃, under intense stirring condition, Dropwise 5 00ml solution B and 500ml solution C simultaneously, rate of addition is for dropwising in 45min.The pH value of solution value remains on 9.0～9.5 in the dropping process.Dropwise and continue to stir 30min, bath temperature to the 60～80 ℃ insulation 3h that raises then naturally cools to room temperature, repeatedly suction filtration, washing precipitation to the pH value 7～8.Precipitation dissolving again, add 20g NaH
2PO
4With 200ml toluene, standing demix behind the vigorous stirring 30min, precipitation is transferred to toluene.Discard lower aqueous solution, toluene is removed in distillation, both the magnalium ratio is 2: 1 a hydrophobic nanometer hydrotalcite.The hydrotalcite particle diameter of preparation is 30～50nm.
In there-necked flask, add a certain amount of polyoxyethylene glycol, Witco 1298 Soft Acid, Resorcinol, begin to add vinylformic acid in the time of 110～120 ℃, after dropwising, in 120 ℃ of constant temperature 2.5h.The reaction solution decompression is steamed water byproduct, react 2h under this temperature, the speed of deviating from moisture obviously slows down; 130 ℃ of constant temperature, to vacuum reaction get the amount of water outlet and theoretical value near the time be reaction end; Be cooled to below 40 ℃ under vacuum condition, discharging gets finished product.
The mass ratio of vinylformic acid and polyoxyethylene glycol is 1: 0.8, and Witco 1298 Soft Acid is 1.2% of vinylformic acid and a polyoxyethylene glycol total mass, and Resorcinol is 0.5% of vinylformic acid and a polyoxyethylene glycol total mass.
The preparation of second step maleic anhydride-propenyl sodium sulfonate-polyalkylene glycol acrylate monoester copolymer: in there-necked flask, add distilled water, maleic anhydride, heated and stirred makes its dissolving, when temperature reaches 60 ℃, begin to add propenyl sodium sulfonate and polyalkylene glycol acrylate monoesters solution, add 1% persulphate (as normal starters such as ammonium persulphate, Sodium Persulfates) of maleic anhydride, propenyl sodium sulfonate and polyalkylene glycol acrylate monoesters and reactant total mass simultaneously.Be warming up to 85 ℃ of reaction 3～5H after dripping, discharging is the target hyper-dispersant.The mass ratio of maleic anhydride, propenyl sodium sulfonate and polyalkylene glycol acrylate monoesters is 50: 35: 15.
Hydrotalcite, the hyper-dispersant of preparation mix with calcium stearate, Zinic stearas, lubricant, surface modifier and auxiliary heat stabilizer, and concrete hybrid mode is as follows:
Earlier calcium stearate (30 weight part), Zinic stearas (20 weight part), hydrotalcite (19 weight part) and hyper-dispersant (1 weight part) are added thorough mixing in the reactor.Get mixture, add heating and stirring in the kneader, add surface modifier (5 weight part), mediate 20min down at 100～110 ℃, add lubricant (10 weight part) then in kneader, auxiliary heat stabilizer (15 weight part) is mediated and is stirred 30min, discharging compressing tablet, screening, packing had both got the finished product.
Wherein: lubricant adopts polyethylene wax; Surface modifier adopts pentaerythritol ester; Auxiliary heat stabilizer adopts epoxy soybean oil.
Embodiment 2:
According to the preparation process of embodiment 1, take by weighing 147.89g MgSO
47H
2O and 66.64g Al
2(SO
4)
318H
2O is dissolved in the 500ml deionized water and is mixed with Mg
2+And Al
3+3: 1 in molar ratio mixing solutions (solution B) is with 64.00gNaOH and 10.60g Na
2CO
3Be dissolved in the 500ml deionized water and be mixed with OH
-/ CO
3 2-16: 1 mixing solutions of mol ratio (solution C).Step as stated above makes the magnalium mol ratio and is 3: 1 hydrophobic nanometer hydrotalcite.The hydrotalcite particle diameter of preparation is 30～70nm.
According to embodiment 1 preparation hyper-dispersant, the mass ratio of maleic anhydride, propenyl sodium sulfonate and polyalkylene glycol acrylate monoesters is 50: 35: 15 in the hyper-dispersant.
Hydrotalcite, the hyper-dispersant of preparation mix with calcium stearate, Zinic stearas, lubricant, surface modifier and auxiliary heat stabilizer, and concrete hybrid mode is as follows:
Earlier calcium stearate (30 parts), Zinic stearas (20 parts), hydrotalcite (19 parts) and hyper-dispersant (1 part) are added thorough mixing in the reactor.Get mixture, add heating and stirring in the kneader, add surface modifier (5 parts), mediate 20min down at 100～110 ℃, add lubricant (10 parts) then in kneader, auxiliary heat stabilizer (15 parts) is mediated and is stirred 30min, discharging compressing tablet, screening, packing had both got the finished product.
Wherein: lubricant adopts Tegin 55G; Surface modifier adopts triphenyl phosphite; Auxiliary heat stabilizer adopts diphenylpropane-1,3-dione(DPPO).
The foregoing description 1 and 2 two kind of thermo-stabilizer 3 mass parts are added respectively among the 100 mass parts PVC, add 60 mass parts dimixo-octyl phthalates (DOP) again, descended mixing 10 minutes at 140 ℃, be pressed into the thin slice that thickness is 1mm under 100 ℃, be cut into the test piece of 1cm * 1cm, do the static-aging experiment under 180 ± 1 ℃ of conditions, experimental result sees Table 1.Wherein embodiment 3 is a Comparative Examples.
Table 1
| Embodiment | ?Mg 2+/Al 3+ | PVC (part) | DOP (part) | Thermo-stabilizer (part) | Heat-stable time (minute) |
| ??1 | ??2 | ??100 | ??60 | ??3 | ??185 |
| ??2 | ??3 | ??100 | ??60 | ??3 | ??196 |
| ??3 | ??/ | ??100 | ??60 | ??0 | ??7 |
Embodiment 4～5:
Use 2: 1 hydrophobic nanometer hydrotalcite of Mg/Al mol ratio, change the composition and the ratio of composite thermal stabilizer, add among 100 parts of PVC by same amount, add 60 parts of dimixo-octyl phthalates (DOP) again, then by GB GB2113-82 " plastics whiteness experimental technique ", three kinds of PVC plastics of preparation are carried out heat-resisting whiteness experiment, table 2 is three kinds of composite thermal stabilizer compositing formulas, and table 3 is that being placed on test piece with whiteness is the relative whiteness value of testing in the whiteness instrument checked of 85% standard white body.Can find that from table 3 prepared hydrophobic nanometer hydrotalcite one package stabilizer is compared with traditional stablizer, has outstanding thermostability.
Table 2
| Embodiment | Hydrophobic nanometer hydrotalcite (weight part) | Hyper-dispersant (weight part) | Calcium stearate (weight part) | Zinic stearas (weight part) | Modification agent+lubricant+auxiliary stabilizer (weight part) |
| ??1 | ??19 | ??1.2 | ??30 | ??20 | ?5+10+15 |
| ??4 | ??10 | ??1.5 | ??35 | ??23.5 | ?5+10+15 |
| ??5 | ??29 | ??1 | ??24 | ??16 | ?5+10+15 |
Wherein: lubricant is selected from polyethylene wax, Tegin 55G or stearic acid and all can; Surface modifier is selected pentaerythritol ester or triphenyl phosphite; Auxiliary heat stabilizer is selected epoxy soybean oil or diphenylpropane-1,3-dione(DPPO).
Table 3
Claims (4)
1. high weather-proof, multiple-effect, environmentally-friendly PVC composite heat stabilizer is characterized in that being made up of the raw material of following mass percent:
Calcium stearate 20～40%
Zinic stearas 15～25%
Hydrophobic nanometer hydrotalcite 10～30%
PVC hyper-dispersant 1～1.5%
Lubricant 5～15%
Surface modifier 4～7%
Auxiliary heat stabilizer 5～15%
Wherein said hydrophobic nanometer hydrotalcite makes according to following steps:
(1) obtain solution A:2 * 10
-3The aqueous solution sodium oleate of mol/l;
(2) obtain solution B: with magnesium salts and aluminium salt in molar ratio 2～3: 1 mixed be mixed with Mg
2+Concentration is the aqueous solution of 0.3～0.6mol/L;
(3) obtain solution C: with KOH or NaOH and Na
2CO
3Or K
2CO
3Press OH
-/ CO
3 2-Mol ratio 12～16: 1 mixed obtain solution C;
(4) get the 500ml solution A and put into the 2L three-necked flask, heating in water bath to 40～60 ℃, under intense stirring condition, drip solution B and the solution C of 400～500ml simultaneously, rate of addition is for dropwising in 30～45min, the pH value of solution value remains on 9.0～9.5 in the dropping process, dropwise and continue to stir 30min, bath temperature to 60～80 ℃ insulation 2～3h then raises, naturally cool to room temperature, repeatedly suction filtration, washing precipitation to the pH value 7～8, precipitation dissolving again, add 10～20g NaH
2PO
4With 200ml toluene, standing demix behind the vigorous stirring 30min, precipitation is transferred to toluene, discards lower aqueous solution, and toluene is removed in distillation, has both got hydrophobic nanometer hydrotalcite.
The PVC hyper-dispersant makes according to following steps:
The preparation of the first step polyalkylene glycol acrylate monoesters: in there-necked flask, add a certain amount of polyoxyethylene glycol, Witco 1298 Soft Acid, Resorcinol, begin to add vinylformic acid in the time of 110～120 ℃, after dropwising, in 120 ℃ of constant temperature 2.5h, the reaction solution decompression is steamed water byproduct, under this temperature, react 2h, the speed of deviating from moisture obviously slows down, 130 ℃ of constant temperature, to vacuum reaction get the amount of water outlet and theoretical value near the time be reaction end, be cooled to below 40 ℃ under vacuum condition, discharging gets finished product;
The preparation of second step maleic anhydride-propenyl sodium sulfonate-polyalkylene glycol acrylate monoester copolymer: in there-necked flask, add distilled water, maleic anhydride, heated and stirred makes its dissolving, when reaching 60 ℃, temperature begins to add propenyl sodium sulfonate and polyalkylene glycol acrylate monoesters solution, add 0.5～1.5wt% persulphate simultaneously, be warming up to 85 ℃ of reaction 3～5H after dripping, discharging is the target hyper-dispersant.
2. high weather-proof, multiple-effect, environmentally-friendly PVC composite heat stabilizer according to claim 1, it is characterized in that described lubricant selection polyethylene wax, Tegin 55G or stearic acid, surface modifier is selected pentaerythritol ester or triphenyl phosphite, and auxiliary heat stabilizer is selected epoxy soybean oil or diphenylpropane-1,3-dione(DPPO).
3. high weather-proof, multiple-effect, environmentally-friendly PVC composite heat stabilizer according to claim 1 is characterized in that the hydrophobic nanometer hydrotalcite particle diameter that obtains is 30～70nm.
4. method for preparing the described high weather-proof, multiple-effect, environmentally-friendly PVC composite heat stabilizer of one of claim 1～3, it is characterized in that earlier calcium stearate, Zinic stearas, hydrophobic nanometer hydrotalcite and hyper-dispersant being added thorough mixing in the reactor, get mixture, add heating and stirring in the kneader, add surface modifier, mediate 20min down at 100～110 ℃, in kneader, add lubricant and composite thermal stabilizer then, mediate and stir 30min, discharging compressing tablet, screening, packing had both got the finished product.
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