CN1024354C - Composite building paint of polyvinyl alcohol and bentonite - Google Patents

Abstract

The composite building coating of polyvinyl alcohol, bentonite and the like can improve the cohesiveness, the covering power, the film forming property, the stability and the brushing property of the coating, can reduce the consumption of base materials and pigments in the traditional coating (106 coating), reduces the cost from 350 plus one 450 yuan per ton to 200-250 yuan per ton, is suitable for interior wall coatings of hospitals, shops, office buildings and civil buildings, and has remarkable economic benefit.

Description

Constructional coatings composed of polyvinyl alcohol and expanded clay etc.

The invention belongs to the architectural decoration paint field, can be used for the interior wall coating of hospital, shop, office building and covil construction.

Along with developing rapidly of China's construction work, the building decoration engineering specification of quality is also more and more higher.At present, extensively having adopted polyvinyl alcohol is base-material, adds a certain amount of filler, pigment and auxiliary agent and makes various building coatings through grinding.The coating made of polyvinyl alcohol and borax reaction is wherein arranged, can only be with the spraying of machine secondary, efficient height but complex process, internally wall base face and humidity have requirement.It is the coating that base-material is made that polyvinyl alcohol and formaldehyde reaction generate polyvinyl alcohol hemiacetal glue, and it is many to contain free formaldehyde content, and the strong impulse smell is arranged, and human body is had harm, and construction is extremely inconvenient, suddenly waits to improve.Polyvinyl alcohol and water glass are the coating (being called for short 106 coating) that base-material is made, and Qu Limeng etc. (Building technology 1983, NO.928-30) report to some extent.This interior wall coating belongs to the low gear product, and price is at 500-550 unit/ton, because starting material are constantly raised the price, polyvinyl alcohol is mentioned 4500 yuan/ton by 3300 yuan/ton, and the titanium dioxide price is to 8000 yuan/ton, and zinc sulfide white is 1700 yuan/ton.Because the cost of 106 interior wall coatings improves constantly, profit descends, and influences the expansion production of this coating.

The objective of the invention is deficiency, 106 coating are improved at above-mentioned building coating.It is abundant to have introduced China storage in 106 coating, exploitation easily, and the cheaper wilkinite of price general charged is as filler.A kind of tonstein, the montmorillonite that wilkinite is made up of the montmorillonoid thing is a kind ofly to have expansion character to be the hydrous alumino silicates that laminate structure contains small amount of alkali and alkaline-earth metal, has water swelling, dispersiveness, suspension, thixotropy and lubricity.It is used in the interior wall coating, can increases cohesiveness, stability, film-forming properties and the brushing property of coating.With the compounded coating of polyvinyl alcohol, can improve the sticking power and the opacifying power of filming.And can reduce the consumption of base-material in 106 coating (polyvinyl alcohol) and pigment (titanium dioxide and zinc sulfide white), and so not only improve the performance of coating, can also reduce the cost of coating significantly.

A kind of polyvinyl alcohol that provides of the present invention is a base-material, contains filler and auxiliary agent, the building coating of making through grinding, and in coating, introduce its recipe ingredient of wilkinite (by weight) and be:

1, base material formulation

Polyvinyl alcohol (industrial goods, DP=1799): 50 parts

Urea (industrial goods): 0.5-1 part

Water (available tap water): 955 parts

B, formulation for coating material

Base-material: 400～540 parts

Water glass (40 ° of available modulus 3.2 degree Beaume): 10～20 parts

Water: 90-200 part

Wilkinite (available sodium bentonite, 300 orders are following): 50-200 part

Ultramarine: 1～2.5 part

Talcum powder (available industrial goods 300 orders are following): 60-1000 part

Light calcium carbonate (available industrial goods, 300 orders are following): 100-150 part

Zinc sulfide white (available industrial goods 300 orders are following): 0-20 part

Sodium hexametaphosphate 99: 0-2 part

Carboxymethyl cellulose: 0-1 part

Tributyl phosphate: 5-10 milliliter

The preparation method of composite coating such as polyvinyl alcohol and wilkinite

1. the preparation of base-material:

By above-mentioned prescription the part tap water is added in the enamel still of 1000 liters that have agitator and heating or cooling jacket, start stirring motor, respectively polyvinyl alcohol and urea are added in the still slowly, in chuck, send steam heating, again the pre-heated tap water of surplus is added in the still, below 98 ℃, kept about 0.5 hour in the still temperature, polyvinyl alcohol all dissolves (blowing is observed no saccharoid), and it is standby that base-material is put into storage tank.

2. the preparation of coating:

By above-mentioned prescription the base-material in the storage tank is filtered metering, squeeze in the batch mixing still that has agitator with pump, 2/3rds of the water component in still in the adding coating, start stirring motor, slowly add the solution after 1/3rd and water glass of water component dilutes in the coating, continue to stir after 20～30 minutes, add sodium bentonite successively by above-mentioned prescription metering again, ultramarine, talcum powder, light calcium carbonate, zinc sulfide white, sodium hexametaphosphate solution carboxymethyl cellulose aqueous solution and tributyl phosphate etc., continue to stir after 10～15 minutes, treat that various mixing of materials are even, send into sand mill and carry out the normal temperature grinding, about 0.5 hour of milling time, after fineness reaches 40～90 μ m, send into storagetank, packing is sold after filtration.Prepare Color paint as need, in the batch mixing still, add mill base and get final product.

3. coating property index:

Outward appearance: shallow orchid, white

Solid content: 36～38%

25 ℃ of viscosity (with No. 4 cups of coating): 40～80 seconds

PH value: 8-10

Fineness :～60 microns

Stability: layering 1～5% in 48 hours

4. coating performance index

Outward appearance: smooth, even, no dry and cracked

Opacifying power :≤200 gram/rice ²

Sticking power: 100%

Erasibility: do not fall ash, anti-certain wet rubbing

Immersion property: phenomenon such as the week of soaking do not have foaming, come off

Thermotolerance: under 80 ± 2 ℃, 8 hours non-yellowing is not clamminess, and does not ftracture

Composite coatings such as the polyvinyl alcohol that provides and wilkinite are provided, can reduce the consumption of base-material (polyvinyl alcohol) and pigment (titanium dioxide and zinc sulfide white) in the 106 traditional coating; Can reduce the cost of coating significantly, drop to 200～250 yuan/ton by 350～450 yuan/ton, remarkable economic efficiency is arranged.With all increase significantly (as shown in table 1) such as its cohesiveness of coating, film-forming properties, stability, brushing property and opacifying powers after the wilkinite improvement.

(table 1 is seen the literary composition back)

Embodiment

1. 100 kilograms of tap water are added 1000 liters and have in the enamel still of agitator and chuck, start stirring motor, slowly add 1 kilogram of urea and 50 kilograms of polyvinyl alcohol.In chuck, send steam heating, then with in 855 kilograms of adding stills of the pre-heated tap water of surplus, when temperature of charge rises to 98 ℃, keep temperature, continue to stir half an hour, treat that polyvinyl alcohol is all after the dissolving, blowing is observed no saccharoid, and it is standby that base-material is put into storage tank.

With the base-material in the storage tank after filtering, squeeze in the batch mixing still that has agitator with pump, add 74 kilograms of tap water, under agitation for poly-500 kilograms, 34 kilograms of water glass that slowly add one times of dilute with water, continue to stir 20～30 minutes, in the batch mixing still, add 110 kilograms of sodium bentonites, 1.8 kilograms of ultramarines in order, 80 kilograms of talcum powder, 170 kilograms of light calcium carbonates, 20 kilograms of zinc sulfide white, 50 kilogram 2% sodium hexametaphosphate solution and 10 milliliters of tributyl phosphates.Continue to stir 10～15 minutes, treat various material uniform mixing after, send into sand mill and grind, about 0.5 hour of milling time, after granularity reached 40～90 μ m, it was standby to enter storagetank.

2. press the base-material compound method preparation base-material of embodiment 1, then after filtering with the base-material in the storagetank, getting 400 kilograms squeezes in the batch mixing still that has agitator with pump, add 143 kilograms of tap water, 20 kilograms of water glass that under agitation slowly add one times of dilute with water, continue to stir 20-30 minute, by adding 110 kilograms of sodium bentonites in the above-mentioned recipe ingredient order batch mixing still, 1.8 the kilogram ultramarine, 80 kilograms of talcum powder, 130 kilograms of light calcium carbonates, 20 kilograms of zinc sulfide white, 75 kilogram of 2% sodium hexametaphosphate solution and 10 milliliters of tributyl phosphates continue to stir 10 minutes, treat each material uniform mixing after, send on the sand mill and grind, about 0.5 hour of milling time, after granularity was 40～90 μ m, it was standby to enter storagetank.

3. press the base-material compound method preparation base-material of embodiment 1, then after filtering with the base-material in the storagetank, getting 400 kilograms squeezes in the mixing tank for coating colors that has agitator with pump, add 137 kilograms of tap water, 36 kilograms of water glass that under agitation slowly add one times of dilute with water, continue to stir 20-30 minute, in the batch mixing still, add 110 kilograms of sodium bentonites by above-mentioned recipe ingredient order, 1.8 kilograms in ultramarine, 90 kilograms of talcum powder, light calcium carbonate 120 kg, 30 kilograms of precipitation terra albas, 75 kilograms of 10 milliliters of tributyl phosphates and 2% sodium hexametaphosphate solutions, continue to stir 10 minutes, and treated to deliver on the sand mill behind the various material uniform mixing and grind about 0.5 hour of milling time, after granularity was 40～90 μ m, it was standby to send into storagetank.

4. press the base-material compound method preparation base-material of embodiment 1, then after filtering with the base-material in the storagetank, getting 400 kilograms squeezes in the batch mixing still that has agitator with pump, add 100 kilograms of tap water, 20 kilograms of water glass that under agitation slowly add one times of dilute with water, continue to stir 20～30 minutes, add the 120 kg sodium bentonite successively by above-mentioned recipe ingredient order, 1.5 the kilogram ultramarine, 100 kilograms of talcum powder, 140 kilograms of light calcium carbonates, 50 kilogram of 2% sodium hexametaphosphate solution, 50 kilogram of 1% carboxymethyl cellulose aqueous solution and 10 milliliters of tributyl phosphates continue to stir 10 minutes, treat that various mixing of materials evenly after, deliver on the sand mill and grind, about 0.5 o'clock of milling time, after granularity was 40～90 μ m, it was standby to send into storagetank.

Composite coating and the comparisons of traditional 106 coating such as table 1 polyvinyl alcohol and bentonite

Base-material pigment

Type cost (PVA) consumption precipitation feelings covering power erasibility brushability

Yuan/ton consumption father-in-law jin condition leaves standstill gram/rice²

Jin/ton/ton 48 hours

Viscosity 80

Bentonite does not fall ash, and still have and be coated with second

Modification 200-250 20-25 0-20 1～5%≤200 is anti-certain

The coating wet rubbing. Brush property does not have

Tradition is fallen viscosity 70 on a small quantity

≤250

106 be coated with 350-450 30-40 60-100 5-10% ash or not second more than have

Material～300 falls ash. Brush mark.

Claims (1)

1. A kind of polyvinyl alcohol is that base-material contains the building coating that filler pigments and auxiliary agent are made through grinding, it is characterized in that having introduced wilkinite in this coating, and recipe ingredient (by weight) is:

   A, base material formulation

   Polyvinyl alcohol: 50 parts

   Urea: 0.5-1 part

   Water: 955 parts

   B, formulation for coating material

   Base-material: 400～540 parts

   Water glass: 10～20 parts

   Water: 90～200 parts

   Wilkinite: 50～200 parts

   Ultramarine: 1～2.5 part

   Talcum powder: 60-100 part

   Light calcium carbonate: 100-150 part

   Zinc sulfide white: 0-20 part

   Sodium hexametaphosphate 99: 0-2 part

   Carboxymethyl cellulose: 0-1 part

   Tributyl phosphate: 5-10 milliliter