CN103408770B - The production technique of redispersable latex powder - Google Patents
The production technique of redispersable latex powder Download PDFInfo
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- CN103408770B CN103408770B CN201310312339.0A CN201310312339A CN103408770B CN 103408770 B CN103408770 B CN 103408770B CN 201310312339 A CN201310312339 A CN 201310312339A CN 103408770 B CN103408770 B CN 103408770B
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- defoamer
- microlayer model
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Abstract
The invention provides a kind of production technique of redispersable latex powder, dispersion liquid spiral pump containing protective colloid is transported in drying plant by this technique, the microlayer model that particle diameter is 10 ~ 100 microns is atomized into by ultracentrifugal mode, use high temperature gas flow rapid heating microlayer model simultaneously, in high temperature gas flow, fill into separant simultaneously, separant is sticked on microlayer model in time by during thermogenesis viscosity at microlayer model, then gas-solid mixture is derived rapidly from drying tower, cooling, worked by cyclonic separation and filtering separation two kinds of modes one, powder in air-flow is separated, sieved by classification, to obtain redispersable latex powder finished product.Adopt redispersable latex powder prepared by technique of the present invention, the adhesiving effect of separant is good, a latex material effectively can be prevented in production, transport and stick together in storage process clustering phenomena, improves the package stability of product.
Description
Technical field
The present invention relates to material of construction, particularly a kind of production technique of the redispersable latex powder for dry-mix.
Background technology
Redispersable latex powder is by spray-dried for the special latex a kind of white solid powder processed, and the main external wall insulation project that is used as is constructed with the important additives of material " dry-mixed mortar " and the additive of other dry-mixed mortars.Normally used redispersable latex powder is the copolymer analog of vinyl acetate between to for plastic, is white powder, can be free to slide, can well be dispersed in water, and form stable emulsion, its performance is identical with original latex.
Redispersable latex powder is as adding material indispensable in dry-mixed mortar product, and its effect in cement powder mortar is remarkable.Cohesive strength and the force of cohesion of material can be improved.Improve transverse elasticity and the folding strength of material.Improve the freeze-thaw resistance of material.Improve the weathering resistance of material, weather resistance, wear resistance.Improve the hydrophobic nature of material, reduce water-intake rate.Improve application property, reduce the shrinking percentage of material.Effectively can prevent cracking.
(1) bonding strength and force of cohesion is improved
In cement powder mortar product, it is extremely necessary for adding redispersable latex powder.It is fairly obvious to the bonding strength of raising material and force of cohesion.This is due to the hole of polymer particle to cement matrix and the infiltration of kapillary, with the result forming good cohesive strength after hydrated cementitious.More due to the excellent bonding force that fluoropolymer resin itself has, improving the improvement of this mineral binder bond of sand-cement slurry the product adhesive power to base material, particularly cement to timber, fiber, these organic substrate bad adhesion of PVC, EPS, act on more obvious.
(2) counter-bending and anti-tensile is improved
In the rigid backbone formed after sand-cement slurry aquation, the film elasticity of polymkeric substance and toughness, between sand-cement slurry particle and particle, play the function of similar active joint, high deformation load can be born, stress is reduced, tension and resistance to bending are improved.
(3) shock resistance is improved
Redispersable latex powder is thermoplastic resin.It to be coated on mortar particle surface soft film, can absorb the impact of external force, loose and do not destroy, thus improves the impact resistance of mortar.
(4) improve hydrophobic nature, reduce water-intake rate
Add redispersable latex powder, the microtexture of sand-cement slurry can be improved.Its polymkeric substance forms irreversible network in cement hydration process, closes the kapillary in cement gel body, blocks the absorption of moisture content, prevents the infiltration of moisture content, and improve impermeability.
(5) wear resistance, weather resistance is improved
Add redispersable latex powder, the closely knit conjugation between sand-cement slurry particle and polymeric film can be increased.The enhancing of cohesive force, correspondingly improves the ability that mortar bears shearing stress, wear rate is reduced, and wear resistance improves, and extends the work-ing life of mortar.
(6) improve freeze-thaw stability, effectively prevent the cracking of material
Redispersable latex powder, the plasticity effect that its thermoplastic resin has, can overcome the destruction of expanding with heat and contract with cold that difference variation is brought cement mortar material.Overcome simple sand-cement slurry greatly dry-shrinkage deformed, the shortcoming of easily be full of cracks, material tool can be made flexible, thus improve the permanent stability of material.
But the production technique of the redispersable latex powder of prior art exists some problems, cause latex particle not evenly tiny, easily stick together clustering phenomena in production, transport and storage process.Thus have impact on its result of use.
Summary of the invention
Object of the present invention, exactly in order to solve the problems referred to above that prior art exists, provides a kind of production technique of redispersable latex powder.
Purpose of design of the present invention can be achieved through the following technical solutions: a kind of production technique of redispersable latex powder, by following material by appended weight percent batching:
Polymer emulsion 72-85%;
Protective colloid 4-9%;
Separant 11-15%;
Functional additive 0-5%;
Adopt following explained hereafter:
A, preparation protective colloid
In a kettle. the protective colloid powder of dosage and water Hybrid Heating are modulated into glue, and add defoamer, heating and thermal insulation, form transparent thick protective colloid, make viscosity reach 2500Mpas, solid content reaches 19.5 ~ 20.5%.
B, preparation dispersion liquid
The protective colloid prepared is placed in compounding kettle, then adds the polymer emulsion of dosage, mix, then add defoamer and add water adjustment viscosity to 70-200Mpas, solid content reaches 39%-42%, is warmed up to 50-55 DEG C, stand-by;
C, spraying dry
Open spray-drying tower, when the inlet temperature being warmed up to spraying dry top of tower is 140-150 DEG C, with spiral pump, the dispersion liquid prepared is transported in the opening for feed of spraying dry top of tower, by the high speed centrifugation atomizing disk in opening for feed, dispersion liquid is atomized into the microlayer model that droplet dia is 10 ~ 100 microns, use high temperature gas flow rapid heating microlayer model simultaneously, in high temperature gas flow, fill into separant simultaneously, separant is sticked on microlayer model in time by during thermogenesis viscosity at microlayer model, subsequently, moisture content in microlayer model is by the quick evaporate to dryness of high temperature gas flow, form gas-solid mixture,
D, cooling are separated
The temperature keeping spray-drying tower air outlet air-flow is 79 DEG C-81 DEG C, gas-solid mixture is derived from the air outlet of spray-drying tower bottom rapidly, import in large-scale bagroom after cooling, powder in air-flow is separated, go out and sieved by classification from powder out, namely obtain redispersion latex powder finished product.
The proportioning adding protective colloid powder in reactor and water described in step a is 25: 100; described defoamer is the defoamer based on organosilicon; the add-on of defoamer is 1% of the total amount of protective colloid powder and water, and heating and thermal insulation temperature is 90-100 DEG C, and soaking time is 1 hour.
The add-on of defoamer described in step b is 1% of the total amount of protective colloid powder and polymer emulsion, and described defoamer is the hydrophobic gas-phase silica of mineral oil and metal soap defoamer.
Cooling described in steps d is that described separation is worked by cyclonic separation and filtering separation two kinds of separate modes one with 5 DEG C of dry-air blast coolings through dehumidification treatments.
The polymkeric substance of described polymer emulsion is selected from vinyl acetate homopolymer, acrylic polymer, ethylene-vinyl acetate copolymer, vinyl acetate-vinyl versatate copolymer, acrylic styrene copolymer, styrene-butadiene copolymer, ethylene-vinyl chloride-vinyl laurate terpolymer, vinylacetate-ethylene-vinyl versatate copolymer, vinyl acetate-acrylate-vinyl versatate copolymer, vinylacetate-ethylene-acrylate copolymer, the mixture of one or more in vinylacetate-ethylene-methylmethacrylate copolymer.
Described protective colloid is low viscosity polyvinyl alcohol.
Described separant is prepared from by the material of following weight percentage:
Heavy calcium carbonate 30-65%;
Water-washed kaoline 30-65%;
Talcum powder 1-10%;
Precipitated hydrated silica 0.1-5%;
Diatomite 1-8%.
Described functional additive is hydrophober.
The production technique of redispersable latex powder of the present invention, owing to have employed above technical scheme, has following advantage and disadvantage:
1, have employed that coordinate with emulsion, relatively low protective colloid addition, powder has good unit weight and size range.
2, after gas-solid mixture derives drying plant, the dry air of rapid low temperature is lowered the temperature, and reduces the time that milk powder is in the condition of high temperature, reduces the risk of milk powder adhesion.
3, traditional separant addition means is mixed with the mode of separant by physics by dried hydrocolloid powder, now powder is in low-temperature condition, surface viscosity is not high, bad with separant adsorption effect, be adsorbed on separant on hydrocolloid powder sieving and easily departing from wrapping process, the shelf characteric of product is deteriorated.The present invention adopts phase microlayer model to be before it is dried heated when just producing viscosity and is sticked in time on microlayer model by separant, and adhesiving effect is good, improves the package stability of product.
Embodiment
A certain amount of water purification is added in proportion in clean reactor; be warmed up to about 50 DEG C; open stirring mechanism; protective colloid powder is added by add the water yield in reactor 25%; the process of adding will slowly add, and prevents powder from reuniting in water, is not added on the sidewall of reactor; add the defoamer being equivalent to total amount 1% after having added, recommend to select organosilicon to be main defoamer.Build charge cavity, be warmed up to about 95 DEG C.Be incubated 1 hour, the liquid in question response still forms transparent thickness glue-like, and without white particle, sampling, tested viscosity and solid content, require that viscosity reaches about 2500Mpas, solid content reaches 19.5 ~ 20.5%.
The protective colloid modulated is joined in compounding kettle; then polymer emulsion is added in proportion; protective colloid is mixed with emulsion; suitable interpolation defoamer; generally be equivalent to about 0.1% of total amount; defoamer should use the silicone based defoamer of self-emulsifying type, and the adjustment viscosity that adds water reaches 70-200Mpas, and solid content reaches 39%-42%.Be warmed up to 50-55 DEG C.Sampling and testing, stand-by.
Dry equipment is opened in unlatching, the present invention adopts spray-drying tower, be warmed up to inlet temperature about 145 DEG C, with spiral pump, deployed dispersion liquid is transported in the opening for feed of spraying dry top of tower, dispersion liquid can be atomized into microlayer model by high speed centrifugation atomizing disk, droplet dia is about 10 ~ 100 microns, with high temperature gas flow rapid heating microlayer model while dispersion liquid is atomized into microlayer model, fill into separant simultaneously, the separant be contained in hot gas flow can be adhered in time by during thermogenesis viscosity at dispersion liquid microlayer model, moisture content in microlayer model can by the quick evaporate to dryness of high temperature gas flow, then gas-solid mixture is derived rapidly from drying tower, the air outlet gas flow temperature under equipment that keeps dry is 79 DEG C-81 DEG C.After gas-solid mixture is derived from drying plant, add 5 DEG C of dry-air blast coolings through dehumidification treatments, air-flow containing powder imports in large-scale bagroom, worked by cyclonic separation and filtering separation two kinds of modes one, powder in air-flow is separated, go out and sieved by classification from powder out, to obtain redispersable latex powder finished product.
Specific embodiment
By solid part be 42% dispersion liquid 1000 kilograms be transported in drying tower with certain pressure, simultaneously add separant 51 kilograms as stated above, after being separated by spraying dry, solid and gas, obtain the suitable powder-product of fineness 461 kilograms.
Claims (2)
1. a production technique for redispersable latex powder, is characterized in that: prepared burden by appended weight percent by following material:
Polymer emulsion 72-85%;
Protective colloid 4-9%;
Separant 11-15%;
Adopt following explained hereafter:
A, preparation protective colloid
In a kettle. the protective colloid powder of dosage and water Hybrid Heating are modulated into glue, and add defoamer, heating and thermal insulation, form transparent thick protective colloid, make viscosity reach 2500Mpas, solid content reaches 19.5 ~ 20.5%;
B, preparation dispersion liquid
The protective colloid prepared is placed in compounding kettle, then adds the polymer emulsion of dosage, mix, then add defoamer and add water adjustment viscosity to 70-200Mpas, solid content reaches 39%-42%, is warmed up to 50-55 DEG C, stand-by;
C, spraying dry
Open spray-drying tower, when the inlet temperature being warmed up to spraying dry top of tower is 140-150 DEG C, with spiral pump, the dispersion liquid prepared is transported in the opening for feed of spraying dry top of tower, by the high speed centrifugation atomizing disk in opening for feed, dispersion liquid is atomized into the microlayer model that droplet dia is 10 ~ 100 microns, use high temperature gas flow rapid heating microlayer model simultaneously, in high temperature gas flow, fill into separant simultaneously, separant is sticked on microlayer model in time by during thermogenesis viscosity at microlayer model, subsequently, moisture content in microlayer model is by the quick evaporate to dryness of high temperature gas flow, form gas-solid mixture,
D, cooling are separated
The temperature keeping spray-drying tower air outlet air-flow is 79 DEG C-81 DEG C, gas-solid mixture is derived from the air outlet of spray-drying tower bottom rapidly, import in large-scale bagroom after cooling, powder in air-flow is separated, go out and sieved by classification from powder out, namely obtain redispersion latex powder finished product;
The proportioning adding protective colloid powder in reactor and water described in step a is 25:100, described defoamer is the defoamer based on organosilicon, the add-on of defoamer is 1% of the total amount of protective colloid powder and water, and heating and thermal insulation temperature is 90-100 DEG C, and soaking time is 1 hour;
The add-on of defoamer described in step b is 1% of the total amount of protective colloid powder and polymer emulsion, and described defoamer is the hydrophobic gas-phase silica of mineral oil and metal soap defoamer;
Described separant is prepared from by the material of following weight percentage:
2. the production technique of redispersable latex powder according to claim 1, is characterized in that: cooling described in steps d is that described separation is worked by cyclonic separation and filtering separation two kinds of separate modes one with 5 DEG C of dry-air blast coolings through dehumidification treatments.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105086308A (en) * | 2015-07-30 | 2015-11-25 | 北京博润佳科技有限公司 | Water-resistant re-dispersible latex powder |
| CN105837115A (en) * | 2016-03-29 | 2016-08-10 | 同济大学 | High strength polymer modified cement mortar, preparation method and application thereof |
| CN107286548B (en) * | 2017-06-28 | 2020-07-28 | 保定华联领世科技有限公司 | Odorless redispersible latex powder and preparation method thereof |
| CN107129629A (en) * | 2017-06-29 | 2017-09-05 | 北京宝辰联合科技股份有限公司 | A kind of redispersible latex powder and preparation method thereof |
| CN107312236A (en) * | 2017-07-27 | 2017-11-03 | 君旺节能科技股份有限公司 | It is a kind of for redispersible latex powder of rock wool bonding mortar and preparation method thereof |
| CN107936269A (en) * | 2017-12-05 | 2018-04-20 | 宝辰永宇（滁州）新材料科技有限公司 | A kind of preparation method of the one-piece type exterior wall latex powder of heat-preservation ventilating waterproof |
| CN110294825B (en) * | 2019-05-08 | 2021-03-23 | 河北四友卓越科技有限公司 | Core-shell type tertiary carbon redispersible latex powder and preparation method thereof |
| CN111909398B (en) * | 2020-07-27 | 2022-08-19 | 浙江天晨胶业股份有限公司 | Powdered styrene butadiene rubber and preparation method thereof |
| CN112143149A (en) * | 2020-09-29 | 2020-12-29 | 安徽皖维高新材料股份有限公司 | Novel acrylic latex powder and preparation method thereof |
| CN112521124A (en) * | 2020-12-25 | 2021-03-19 | 张映春 | Preparation and application method of solidified polymer powder |
| CN113831440A (en) * | 2021-10-09 | 2021-12-24 | 山西广聚砼建材有限公司 | Vinyl acetate-acrylic re-dispersible latex powder and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5118751A (en) * | 1990-09-27 | 1992-06-02 | Wacker Chemie Gmbh | Redispersible powder composition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5118751A (en) * | 1990-09-27 | 1992-06-02 | Wacker Chemie Gmbh | Redispersible powder composition |
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