CN105504881A - Modification method of nano calcium carbonate special for PVC injection molding material - Google Patents
Modification method of nano calcium carbonate special for PVC injection molding material Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/02—Compounds of alkaline earth metals or magnesium
- C09C1/021—Calcium carbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
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- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention discloses a surface modification method of nano calcium carbonate special for a PVC injection molding material. The method comprises the steps that calcium carbonate with the specific area of 20-32 m<2>/g is prepared into suspension slurry, stirring is continuously performed, and the temperature is increased to 70 DEG C-90 DEG C; a composite surface treating agent is added for wrapping, stirring is performed for 60-90 min, and surface treatment is completed; temperature lowering and filtering are performed to obtain crude surface-modified nano calcium carbonate; the crude product is dried, crushed and screened, and then the nano calcium carbonate special for the PVC injection molding material is obtained. The nano calcium carbonate is good in dispersion, has the very good compatibility with PVC resin and can inhibit separation of the self surface treating agent, play a very good inhibition role in separation of an external lubricating agent in a PVC formula, improve the injection molding fluidity of PVC filling and beautify the product appearance. The raw materials are cheap and easy to obtain, the technology is simple and practical, the production cost is low, the application effect is good, the environment is not polluted, and the method is suitable for industrialized production and has the better economic benefit and social benefit.
Description
Technical field
The present invention relates to a kind of surface treatment method of nano-calcium carbonate, particularly relate to the surface modifying method that a kind of PVC injection molding material is Nano calcium carbonate dedicated.
Background technology
Polyvinyl chloride resin melt viscosity is high, and needs good mobility during injection moulding, so often need a certain amount of inside and outside lubricant, as stearic acid, calcium stearate, paraffin and polyethylene wax etc. in formula.Add external lubricant and also can improve PVC product surface gloss, improve system thermostability, reduce thermo-stabilizer consumption, reduce formulation cost.But due to external lubricant and PVC consistency bad, easily separate out at its product surface, occur the vestige of speckle and burn, stock mould precipitate is too much, unfavorable to continuous seepage, Mechanical Properties of Products also may be caused to decline, become fragile.
Nano-calcium carbonate, as a kind of excellent mineral filler, except playing increment filling effect, also can improve polymer composites mechanical property, and adjustment processing characteristics, beautifies products appearance, have broad application prospects in PVC processing industry.But because nano-calcium carbonate particle diameter is little, specific surface energy is high, very easily reunites.Meanwhile, the hydrophilic oleophobic of calcium carbonate surface, with polyvinyl chloride resin poor compatibility.Therefore must carry out surface activation process to nano-calcium carbonate, in fact activation treatment is exactly that option table surface-active agent carries out coated to calcium carbonate granule, makes it to become functional filling material.Conventional surface treatment agent is generally lipid acid or its salt, and treatment agent produces chemisorption and physical adsorption at calcium carbonate surface.Physisorption power is weak, easily separates out on PVC product surface, presents similar bad phenomenon excessive in external lubricant.
Chinese patent CN103013181A discloses a kind of using phthalic acid single methanol ester (salt) as the nano-calcium carbonate surface treatment method of properties-correcting agent, the nano-calcium carbonate obtained has lower oil-absorption(number), with polyvinyl chloride resin and plasticizer compatbility better, but the phthalic acid single methanol ester (salt) adopted can only carry out physical adsorption at calcium carbonate surface, and properties-correcting agent is easily separated out.
Chinese patent CN101671497A discloses the preparation method of the special nano-calcium carbonate of a kind of PVC, it adopts stearate soap to coordinate soluble Zn salt pair nano-calcium carbonate to carry out wet process surface treatment, at nano-calcium carbonate Surface coating calcium stearate and Zinic stearas, the calcium carbonate obtained has good thermostability.But easily occur during its filled PVC injection molding material that zinc burns phenomenon.
Chinese patent CN103772744A discloses a kind of preparation method of PVC modified calcium carbonate, adopt the surface treatment agents such as tripoly phosphate sodium STPP, sodium polyacrylate, trolamine to carry out modification to calcium carbonate, the calcium carbonate after modification has good dispersiveness and consistency in PVC.But also fail to solve the problem of PVC product separating out of outer lubricants.
In sum, be difficult to prior art surface-treated nano-calcium carbonate the Production requirement meeting PVC injection molding material.
Summary of the invention
The object of the present invention is to provide the Nano calcium carbonate dedicated surface treatment method of a kind of PVC injection molding material, the precipitation of surface-treated agent can not only be suppressed, also good restraining effect is played to the separating out of outer lubricants in PVC formula, improve PVC processing fluidity, improve products appearance.
The present invention realizes based on following principle:
Wet process surface treatment is carried out to the nano-calcium carbonate of particle diameter between 70 ~ 110nm, adopt carbon atom be 16 ~ 22 saturated fatty acid soap and sulfonated alkyl naphathalene composite as surface treatment agent according to a certain percentage.Introduce alkylnaphthalene chain on nano-calcium carbonate surface, active adsorption lipid acid, paraffin, polyethylene wax etc. can divide subchain, suppress the precipitation of fatty acid treatment agent, and promote the dispersion of wax crystalline substance, prevent its cohesion crystallization.Sulfonated alkyl naphathalene itself also has good lubricity, can effectively improve PVC fluidity of molten, improves goods glossiness.
Technical scheme of the present invention is as follows:
The surface modifying method that PVC injection molding material is Nano calcium carbonate dedicated, comprises slurrying, surface treatment, drying, pulverizing process, and main technique operation is as follows:
(1) slurrying: the milk of lime after refining, ageing 48h is diluted, proportion is adjusted to 1.050 ~ 1.080, control temperature is 18 ~ 27 DEG C, then be transported in 40m3 bubbling carbonizing tower, pass into purification, cooled kiln gas carries out carbonation reaction, kiln gas flow control 3 ~ 5m3/h, carbonic acid gas volume content is 30 ~ 35%, when the pH of reaction solution drops to below 7.5, carbonation reaction completes, and the specific surface area (BET) of calcium carbonate controls at 20 ~ 32m
2between/g, obtain nano-calcium carbonate suspension slurry;
(2) surface treatment: the nano-calcium carbonate suspension slurry obtained in step (1) is transported in surface treatment pond, Keep agitation, is warming up to 70 ~ 90 DEG C, then adds compound base amount method agent and carries out coated, churning time is 60 ~ 90min, completes surface treatment;
(3) filter: lowered the temperature by the surface treatment slurries that step (2) obtains, ordinary method is filtered, and obtains the thick product of surface modified nano calcium carbonate;
(4) dry: the thick product drying that step (3) is obtained, pulverize, sieve according to a conventional method and obtain the Nano calcium carbonate dedicated product of PVC injection moulding.
Feed composition and the weight proportion of above-described compound base amount method agent are: saturated fatty acid soap: sulfonated alkyl naphathalene=1 ~ 5: 1.
Above-described saturated fatty acid soap adopt carbon atom number be 16 ~ 22 any one lipid acid, or any proportioning of several lipid acid according to a conventional method saponification obtain.
The saponifying agent of above-described saponification mainly selects sodium hydroxide or potassium hydroxide.
The consumption of above-described compound base amount method agent is: 2.3 ~ 3.5% of calcium carbonate butt.
Above-described compound base amount method agent preparation process is as follows: in the hot water of 70 ~ 90 DEG C, add 14 ~ 17% sodium hydroxide or potassium hydroxide, add saturated fatty acid after abundant dissolving and carry out saponification reaction, stir 20min, and then add sulfonated alkyl naphathalene, stir 30min, obtain compound base amount method agent.
Above-described pulverizing adopts eddy mill.
Above-described drying adopts chain band drying machine, and drying temperature is 100 ~ 120 DEG C.
Advantage of the present invention and positively effect:
(1) the nano-calcium carbonate calcium product favorable dispersity prepared of the present invention, has good consistency with polyvinyl chloride resin, plays good restraining effect, and improves filled PVC injection molding mobility, beautify products appearance to the separating out of outer lubricants in PVC formula.
(2) the raw materials used sulfonated alkyl naphathalene of the inventive method has remarkable milkiness energy, chemisorption and physical adsorption is produced at calcium carbonate surface, with polyvinyl chloride resin and plasticizer compatbility better, coordinate the calcium carbonate after fatty acid modified process in PVC, have good dispersiveness and consistency, the precipitation of surface-treated agent can be suppressed, solve the technical problem of PVC product glossiness, improve the quality of PVC product.
(3) the inventive method is raw materials used cheap and easy to get, technique simple possible, and production cost is low, and effect is good, free from environmental pollution, is applicable to suitability for industrialized production, has good economic benefit and social benefit.
embodiment:
To be described in detail the specific embodiment of the invention below, but the present invention is not limited to the restriction of scope of embodiments.
The preparation of nano-calcium carbonate suspension slurry:
Milk of lime after refining, ageing 48h is diluted, proportion is adjusted to 1.050 ~ 1.080, control temperature is 18 ~ 27 DEG C, then be transported in 40m3 bubbling carbonizing tower, pass into purification, cooled kiln gas carries out carbonation reaction, kiln gas flow control 3 ~ 5m3/h, carbonic acid gas volume content is 30 ~ 35%, when the pH of reaction solution drops to below 7.5, carbonation reaction completes, and obtains nano-calcium carbonate suspension slurry.
The specific surface area (BET) of embodiment of the present invention nano-calcium carbonate slurry dried used powder is 20 ~ 32m
2/ g, cube regular morphology in class.
embodiment 1
(1) be 20.4m by brand-new specific surface area (BET)
2the nano-calcium carbonate suspension slurry of/g, mass concentration 14% injects surface treatment pond, and Keep agitation, keeps constant temperature 8min after being heated to 70 DEG C.
(2) 2.3%(is prepared in calcium carbonate butt) fatty acid soaps and the agent of sulfonated alkyl naphathalene compound base amount method, wherein fatty acid soaps: sodium alkyl naphthalene sulfonate=1:1.Lipid acid selects stearic acid, and sodium hydroxide selected by saponifying agent, and saponifying agent consumption is 15% of lipid acid, in 70 DEG C of hot water, stirs 20min, is incubated, adds sodium alkyl naphthalene sulfonate after completing saponification reaction, stir 30min, obtain compound base amount method agent.
(3) in the slurries obtained in step (1), add the surface treatment agent prepared by step (2), after stirring 60min, namely complete surface treatment.
(4) lowered the temperature by the slurries that step (3) is handled well, after filter-press dehydration, usage chain band drying machine is dried, drying temperature is 105 DEG C, pulverizes, classification after drying with eddy mill, packaging, can obtain the Nano calcium carbonate dedicated product of PVC injection molding material of the present invention.
embodiment 2
(1) be 26.1m by brand-new specific surface area (BET)
2the nano-calcium carbonate suspension slurry of/g, mass concentration 14% injects surface treatment pond, and Keep agitation, keeps constant temperature 10min after being heated to 80 DEG C.
(2) 2.9%(is prepared in calcium carbonate butt) fatty acid soaps and the agent of sulfonated alkyl naphathalene compound base amount method, wherein fatty acid soaps: sodium alkyl naphthalene sulfonate=1:1.Lipid acid selects stearic acid, and sodium hydroxide selected by saponifying agent, and saponifying agent consumption is 15% of lipid acid, in 75 DEG C of hot water, stirs 20min, is incubated, adds sodium alkyl naphthalene sulfonate after completing saponification reaction, stir 30min, obtain compound base amount method agent.
(3) in the slurries obtained in step (1), add the surface treatment agent prepared by step (2), after stirring 90min, namely complete surface treatment.
(4) lowered the temperature by the slurries that step (3) is handled well, after filter-press dehydration, usage chain band drying machine is dried, drying temperature is 105 DEG C, pulverizes, classification after drying with eddy mill, packaging, can obtain the Nano calcium carbonate dedicated product of PVC injection molding material of the present invention.
embodiment 3
(1) be 31.9m by brand-new specific surface area (BET)
2the nano-calcium carbonate suspension slurry of/g, mass concentration 14% injects surface treatment pond, and Keep agitation, keeps constant temperature 12min after being heated to 70 DEG C.
(2) 3.5%(is prepared in calcium carbonate butt) fatty acid soaps and the agent of sulfonated alkyl naphathalene compound base amount method, wherein fatty acid soaps: sodium alkyl naphthalene sulfonate=1:1.Lipid acid selects stearic acid, and sodium hydroxide selected by saponifying agent, and saponifying agent consumption is 15% of lipid acid, in 70 DEG C of hot water, stirs 20min, is incubated, adds sodium alkyl naphthalene sulfonate after completing saponification reaction, stir 30min, obtain compound base amount method agent.
(3) in the slurries obtained in step (1), add the surface treatment agent prepared by step (2), after stirring 80min, namely complete surface treatment.
(4) lowered the temperature by the slurries that step (3) is handled well, after filter-press dehydration, usage chain band drying machine is dried, drying temperature is 105 DEG C, pulverizes, classification after drying with eddy mill, packaging, can obtain the Nano calcium carbonate dedicated product of PVC injection molding material of the present invention.
embodiment 4
(1) be 25.6m by brand-new specific surface area (BET)
2the nano-calcium carbonate suspension slurry of/g, mass concentration 14% injects surface treatment pond, and Keep agitation, keeps constant temperature 6min after being heated to 70 DEG C.
(2) 3.5%(is prepared in calcium carbonate butt) fatty acid soaps and the agent of sulfonated alkyl naphathalene compound base amount method, wherein fatty acid soaps: sodium alkyl naphthalene sulfonate=3:1.Lipid acid selects stearic acid, and sodium hydroxide selected by saponifying agent, and saponifying agent consumption is 15% of lipid acid, in 90 DEG C of hot water, stirs 20min, is incubated, adds sodium alkyl naphthalene sulfonate after completing saponification reaction, stir 30min, obtain compound base amount method agent.
(3) in the slurries obtained in step (1), add the surface treatment agent prepared by step (2), after stirring 60min, namely complete surface treatment.
(4) lowered the temperature by the slurries that step (3) is handled well, after filter-press dehydration, usage chain band drying machine is dried, drying temperature is 110 DEG C, pulverizes, classification after drying with eddy mill, packaging, can obtain the Nano calcium carbonate dedicated product of PVC injection molding material of the present invention.
embodiment 5
(1) be 26.0m by brand-new specific surface area (BET)
2the nano-calcium carbonate suspension slurry of/g, mass concentration 14% injects surface treatment pond, and Keep agitation, keeps constant temperature 8min after being heated to 80 DEG C.
(2) 2.9%(is prepared in calcium carbonate butt) fatty acid soaps and the agent of sulfonated alkyl naphathalene compound base amount method, wherein fatty acid soaps: sodium alkyl naphthalene sulfonate=3:1.Lipid acid selects stearic acid, and sodium hydroxide selected by saponifying agent, and saponifying agent consumption is 15% of lipid acid, in 90 DEG C of hot water, stirs 20min, is incubated, adds sodium alkyl naphthalene sulfonate after completing saponification reaction, stir 30min, obtain compound base amount method agent.
(3) in the slurries obtained in step (1), add the surface treatment agent prepared by step (2), after stirring 60min, namely complete surface treatment.
(4) lowered the temperature by the slurries that step (3) is handled well, after filter-press dehydration, usage chain band drying machine is dried, drying temperature is 110 DEG C, pulverizes, classification after drying with eddy mill, packaging, can obtain the Nano calcium carbonate dedicated product of PVC injection molding material of the present invention.
embodiment 6
(1) be 25.8m by brand-new specific surface area (BET)
2the nano-calcium carbonate suspension slurry of/g, mass concentration 14% injects surface treatment pond, and Keep agitation, keeps constant temperature 10min after being heated to 90 DEG C.
(2) 2.9%(is prepared in calcium carbonate butt) fatty acid soaps and the agent of sulfonated alkyl naphathalene compound base amount method, wherein fatty acid soaps: sodium alkyl naphthalene sulfonate=3:1.Lipid acid selects 20% stearic acid+80% lauric acid, and sodium hydroxide selected by saponifying agent, and saponifying agent consumption is 17% of lipid acid, in 90 DEG C of hot water, stir 20min, be incubated after completing saponification reaction, add sodium alkyl naphthalene sulfonate, stir 30min, obtain compound base amount method agent.
(3) in the slurries obtained in step (1), add the surface treatment agent prepared by step (2), after stirring 90min, namely complete surface treatment.
(4) lowered the temperature by the slurries that step (3) is handled well, after filter-press dehydration, usage chain band drying machine is dried, drying temperature is 110 DEG C, pulverizes, classification after drying with eddy mill, packaging, can obtain the Nano calcium carbonate dedicated product of PVC injection molding material of the present invention.
embodiment 7
(1) be 25.9m by brand-new specific surface area (BET)
2the nano-calcium carbonate suspension slurry of/g, mass concentration 14% injects surface treatment pond, and Keep agitation, keeps constant temperature 5min after being heated to 90 DEG C.
(2) 2.9%(is prepared in calcium carbonate butt) fatty acid soaps and the agent of sulfonated alkyl naphathalene compound base amount method, wherein fatty acid soaps: sodium alkyl naphthalene sulfonate=5:1.Lipid acid selects 50% stearic acid+50% behenic acid, and potassium hydroxide selected by saponifying agent, and saponifying agent consumption is 16% of lipid acid, in 90 DEG C of hot water, stir 20min, be incubated after completing saponification reaction, add sodium alkyl naphthalene sulfonate, stir 30min, obtain compound base amount method agent.
(3) in the slurries obtained in step (1), add the surface treatment agent prepared by step (2), after stirring 90min, namely complete surface treatment.
(4) lowered the temperature by the slurries that step (3) is handled well, after filter-press dehydration, usage chain band drying machine is dried, drying temperature is 105 DEG C, pulverizes, classification after drying with eddy mill, packaging, can obtain the Nano calcium carbonate dedicated product of PVC injection molding material of the present invention.
comparative example 1
(1) by brand-new specific surface area (BET) 26.2m
2the nano-calcium carbonate suspension slurry of/g, mass concentration 14% injects surface treatment pond, keeps constant temperature after being heated to 70 DEG C.
(2) 2.9%(is prepared in calcium carbonate butt) surface treatment agent, wherein surface treatment agent is fatty acid soaps entirely, and lipid acid selects stearic acid, and sodium hydroxide selected by saponifying agent, and saponifying agent consumption is 15% of lipid acid, prepares in 90 DEG C of hot water.
(3) in the slurries obtained in step (1), add the surface treatment agent prepared by step (2), after stirring 60min, namely complete surface treatment.
(4) lowered the temperature by the slurries that step (3) is handled well, after filter-press dehydration, usage chain band drying machine is dried, and drying temperature is 105 DEG C, and pulverize with eddy mill after drying, classification, packaging, can obtain the nano-calcium carbonate calcium product of this comparative example.
The surface treatment agent consumption of above-described embodiment and comparative example and organize gradation parameter, calculate in mass, treatment agent consumption is in calcium carbonate butt.
Above-described embodiment and comparative example product make PVC product by following formula, and PVC injection raw material formula is in table 1; Each example carries out performance test after making goods, and test result is in table 2.
Table 1:PVC injection raw material formula table
Table 2: the performance test results table of embodiment and comparative example
From upper table experimental result contrast, the whiteruss contact angle of the PVC injection-molded item of various embodiments of the present invention is obviously less than comparative example, illustrate that the inventive method can significantly improve dispersiveness and the consistency of nano-calcium carbonate and polyvinyl chloride resin, improve PVC processing fluidity, the precipitation of surface-treated agent can not only be suppressed, also good restraining effect is played to the separating out of outer lubricants in PVC formula.The tensile strength of the PVC injection-molded item of various embodiments of the present invention, flexural strength, shock strength are all better than comparative example.From rheology testing result, various embodiments of the present invention are less than the moment of torsion of comparative example, and processing fluidity is better, and fusion time is shorter.The PVC injection-molded item of various embodiments of the present invention has more good outward appearance, does not have speckle, bright and clean, even, touches without contrasting oil sample sensation as sample with hand; And the smooth surface of the PVC injection-molded item of comparative example, but dapple.
To sum up result illustrates, product of the present invention can effectively prevent from the external lubricants such as paraffin from making in process at PVC separating out, and improves the processing fluidity of PVC, improves the outward appearance of PVC product, improves the quality of PVC product.
Claims (8)
1. the surface modifying method that PVC injection molding material is Nano calcium carbonate dedicated, is characterized in that: comprise slurrying, surface treatment, drying, pulverizing process, and main technique operation is as follows:
(1) slurrying: the milk of lime after refining, ageing 48h is diluted, proportion is adjusted to 1.050 ~ 1.080, control temperature is 18 ~ 27 DEG C, then be transported in 40m3 bubbling carbonizing tower, pass into purification, cooled kiln gas carries out carbonation reaction, kiln gas flow control 3 ~ 5m3/h, carbonic acid gas volume content is 30 ~ 35%, when the pH of reaction solution drops to below 7.5, carbonation reaction completes, and the specific surface area (BET) of calcium carbonate controls at 20 ~ 32m
2between/g, obtain nano-calcium carbonate suspension slurry;
(2) surface treatment: the nano-calcium carbonate suspension slurry obtained in step (1) is transported in surface treatment pond, Keep agitation, and be warming up to 70 ~ 90 DEG C, then add compound base amount method agent and carry out coated, churning time is 60 ~ 90min, completes surface treatment;
(3) filter: lowered the temperature by the surface treatment slurries that step (2) obtains, ordinary method is filtered, and obtains the thick product of surface modified nano calcium carbonate;
(4) dry: the thick product drying that step (3) is obtained, pulverize, sieve according to a conventional method and obtain the Nano calcium carbonate dedicated product of PVC injection moulding.
2. the surface modifying method that a kind of PVC injection molding material according to claim 1 is Nano calcium carbonate dedicated, is characterized in that: feed composition and the weight proportion of described compound base amount method agent are: saturated fatty acid soap: sulfonated alkyl naphathalene=1 ~ 5: 1.
3. the surface modifying method that a kind of PVC injection molding material according to claim 2 is Nano calcium carbonate dedicated, it is characterized in that: described saturated fatty acid soap adopt carbon atom number be 16 ~ 22 any one lipid acid, or any proportioning of several lipid acid according to a conventional method saponification obtain.
4. the surface modifying method that a kind of PVC injection molding material according to claim 3 is Nano calcium carbonate dedicated, is characterized in that: the saponifying agent of above-described saponification mainly selects sodium hydroxide or potassium hydroxide.
5. the surface modifying method that a kind of PVC injection molding material according to claim 2 is Nano calcium carbonate dedicated, is characterized in that: the consumption of described compound base amount method agent is: 2.3 ~ 3.5% of calcium carbonate butt.
6. the surface modifying method that a kind of PVC injection molding material according to claim 4 is Nano calcium carbonate dedicated, it is characterized in that: described compound base amount method agent preparation process is as follows: in the hot water of 70 ~ 90 DEG C, add 14 ~ 17% sodium hydroxide or potassium hydroxide, add saturated fatty acid after abundant dissolving and carry out saponification reaction, stir 20min, and then add sulfonated alkyl naphathalene, stir 30min, obtain compound base amount method agent.
7. the surface modifying method that a kind of PVC injection molding material according to claim 1 is Nano calcium carbonate dedicated, is characterized in that: described pulverizing adopts eddy mill.
8. the surface modifying method that a kind of PVC injection molding material according to claim 1 is Nano calcium carbonate dedicated, is characterized in that: described drying adopts chain band drying machine, and drying temperature is 100 ~ 120 DEG C.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106478989A (en) * | 2016-11-28 | 2017-03-08 | 成都硕屋科技有限公司 | Plastic additive, preparation method and applications |
| CN111440461A (en) * | 2020-04-30 | 2020-07-24 | 广西夏阳环保科技有限公司 | Preparation method of calcium carbonate special for plastics and coatings |
| CN112960685A (en) * | 2021-03-04 | 2021-06-15 | 安徽省宣城市华纳新材料科技有限公司 | Preparation method of nano calcium carbonate for filling hard PVC (polyvinyl chloride) |
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