Selection of raw materials for interior and exterior latex paint
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Selection of raw materials for interior and exterior latex paint
Yang wenyuan (taizhou silian chemical co., LTD., 225312)
Abstract: the selection of raw materials for interior and exterior latex paint is discussed in order to produce high cost effective latex paint.
Keywords: interior wall latex paint; Exterior wall latex paint; The raw materials
Article no. : 1009-1696 (2012) 04-0044-03
0 the introduction
In the past ten years, it should be said that China's economy has been developing rapidly
Ten years, of course, is the architectural paint rapid development stage. According to the
Statistics show that the annual output of China's construction coating was 3,518,000 tons in 2010
Annual production was six times in 2001. Average annual paint usage per person is a measure
The bellwether of national economy and people's living standard. With developed countries
Than, the use amount of building coating per capita still is very low in our country. Statistically, I
The per capita construction paint consumption in China is 2.6kg /a, and the per capita construction paint in cities and towns
The material usage amount is 5.5 kg/a, while that of building coating per capita in developed countries such as Europe and America
Material usage: over 25 kg/a. With China's future urbanization process
The acceleration of urban population growth, coupled with urban and rural for housing
Demand improvement, decoration demand will further rise in the foreseeable
In the future, the demand for interior and exterior wall coatings will still be on the rise.
There is a lot of room for improvement of architectural paint usage in China.
As the demand for interior and exterior emulsioni paint continues to rise in recent years
A large number of medium - sized paint production enterprises. Although the exterior wall latex
Paint production technology gradually mature, but with the scale of large enterprises
Production, small businesses are increasingly struggling, many even
Without their own professional technical staff, the paint product formula is either one
Some high quality raw materials piled up, or some inferior raw materials pool
Set, coating performance stability and overall profits are also discounted.
This paper attempts to combine the author's experience in the process of the shallow
The formulation, raw material selection and production process control of exterior and interior latex paint are discussed
Basic formula of inner and outer wall emulsion paint
With GB/T 9756-2009 "synthetic resin emulsion interior wall coating" and
GB/T 9755-2001 "synthetic resin emulsion exterior wall paint" as an example
Formula of internal and external emulsioni paint (see table 1). Additional, inside wall emulsioni paint return
Mandatory standard GB 18582-2008 must be met.
Table 1. Basic formula of exterior and interior latex paint
Table 1 The formulation of interior/exterior latex paint
Interior wall emulsion paint base formula (white) exterior wall emulsion paint base formula (white)
Serial number material name quantity /‰
1 water 250 1 water 120
2 wetting agent PE100 1 2 wetting agent PE100 1
3 dispersant SN5040 6 3 dispersant SN5040 6
4 defoamer NXZ 1 4 defoamer NXZ 1
5 propylene glycol 10 5 propylene glycol 10
6 preservative LXE 2 6 preservative LXE 1.5
7 anatase titanium 60 7 rutile titanium 120~150
84,000 megasolinite 80~100 8 heavy calcium 150~250
9 800 mesh heavy calcium 150~250 9 barium sulfate 50
10 barium sulfate 60 10 wollastonite 40
11 talc powder 40 11 styrene emulsion 240~260
12 styrene-acrylic emulsion 120 12 film forming assistant
5 to 7
13 film forming assistant
5~7 13 defoaming agent NXZ 1.5~2
14 defoaming agent NXZ 1.5~2 14 rheology auxiliaries appropriate
15 suitable amount of the rheological agent 15 suitable amount of cellulose thickening agent
16 cellulose thickener appropriate amount of 16 alkali swelling thickener appropriate
17 moderate amount of alkali swelling thickener 17 moderate amount of water
18 a moderate amount of water
PH regulator micro amount
2. Selection of raw materials for emulsion paint
2.1 the emulsion
Emulsion is the most important film forming material in the inner and outer wall emulsion paint.
For internal wall emulsion paint, generally use vinegar emulsion, vinegar tertiary emulsion, benzene
Acrylic emulsion; For exterior wall latex paint, pure propyl emulsion, silicon-propyl emulsion,
Styrene-acrylic emulsion. At present in China, most of the interior and exterior latex paint is benzene
Acrylic emulsion, because of its cost - effective acceptance. To reach the inner wall latex
Performance requirements of lacquer GB/T 9756 -- 2009, in basic formula design,
The most important is the number of times of washing, the emulsion in the formula
2.2 selection of preservatives and fungicides
Whether preservative or fungicide, the variety on the market
Are very complex, the principles of selection are generally efficient, low toxicity, compatibility,
Stable, durable and cost-effective. Use of formaldehyde is becoming increasingly popular
Type of preservative, through its slow release, to achieve a certain degree of germicidal efficacy,
It not only has the advantages of formaldehyde, but also avoids the disadvantages of formaldehyde. general
In the formula, the amount of preservative is 0.1%~0.3%, the use of anti - mildew agent
Content is 0.3% ~ 0.6%. For products that require special mildew resistance, choose
It is better to use two or more fungicides. Fungicides are mainly used
Prevent the wet areas where rain is abundant from producing mildew on the walls and dry in the north
Area production USES emulsioni paint, most enterprises do not add anti - mildew agent.
2.3 selection of wetting dispersant
The wetting, dispersing, and stabilizing of pigments is often closely linked,
Wetting is the process of particle replacement on pigment surface. Disperse is the pigment in
The process of separation under the action of external forces; Stability is the final dispersal
The pigment granules no longer condense twice. The common wetting agent for latex paint is
Cognis PE100; The commonly used dispersants are polyacrylate and polyacrylate
Polyphosphate. In practice, 0.2% polyphosphate and
A mixture of 0.2% to 0.4% polyacrylate. Storage stability of coatings,
Washing resistance is a key index to evaluate dispersant.
2.4 selection of antifoaming agent
Antifoaming agents can be divided into antifoaming agents and defoaming agents. Antifoaming agent has been on
The foaming agent is on the coating surface
The surface plays a role in destroying the bubbles that have formed. In the production of latex paint
In control, antifoaming agents are usually added twice, at the pulping stage and in paint making
Add 1/2 to each stage. Or 2/3 in the pulping stage and 2/3 in the paint stage
In the third. At the stage of pulping, it is best to add a defoaming agent with strong anti-foam effect.
In the paint stage it is best to add the foam breaking ability strong anti - foam agent.
2.5 selection of film forming auxiliaries
The emulsion itself is thermoplastic, so in order to guarantee the film performance,
You don't want it to be too soft, and you want it to be as hot as possible.
Corresponding production of emulsion paint the lowest film temperature is higher, so low temperature
Construction and film formation become a problem, which is through the addition of film auxiliary
The amount of film forming AIDS generally depends on the amount of emulsion, but
The vitrification temperature of emulsion also affects the amount of film additives
Big. In addition, such as propylene glycol, ethylene glycol such as antifreeze agent is also certain
And the amount of them to the amount of the film forming AIDS
It has an impact. Furthermore, with the increase of PVC (pigment volume concentration),
That is, the amount of emulsion reduced, the film is more difficult, because with the face filling
The adhesion of the material to the film forming agent greatly reduces the efficiency of the film forming agent.
Most of the production of film additives in the paint phase of emulsion Tim
After adding, such production if the operation is not good, film auxiliary
So that the emulsion quickly polymerized into small particles and coarse, so must be stirred at low speed
Mix slowly in the mix, so that the film agent to play the largest role. There are also
It is added before the painting stage, although it is safer to do so
Hydrophobic film forming AIDS will be wetted by emulsifying, and face filler in advance
Adhesion, the actual effectiveness of film - forming AIDS will be greatly reduced.
The dosage of film forming assistant should be based on the emulsion, adding process, formula,
The different of season, area will be treated flexibly, its regular dosage is emulsion use
0.05 times the amount.
2.6 selection of thickeners
Latex paint is water as the dispersing medium of the paint, and water viscosity
Very low, can not meet the construction requirements, need thickening agent to adjust the flow
Degeneration. Commonly used thickeners are cellulose, non - associative alkali swelling
Type ii and associative alkali swelling type thickeners, their properties are shown in table 2.
Table 2 properties of various thickeners
Table 2 The characteristics of various thickeners
Comparison of cellulose non-associative alkali swelling type association alkali swelling type
The thickening efficiency is higher and higher
PH sensitivity is generally very high
Poor splash resistance is better
Poor leveling is generally good
Flow resistance is better, better and better
The optical retention is generally good
Better water resistance, better and better
Good alkali resistance is general
The prices are higher, moderate and cheaper
Yang wenyuan: the choice of raw material of latex paint for inner and outer walls
Shanghai paint volume 50
It can be seen from table 2 that various thickeners have different advantages and disadvantages in milk
In the paint system, if only one thickening agent is used, the storage stability,
Construction effect and other aspects are difficult to achieve the expected performance, most of them are adopted
Two or more thickeners are used to achieve the desired effect.
2.7 choice of fillers
Take white latex paint as an example, rutile titanium dioxide is the best
White pigment. In our country most manufacturer, interior wall emulsioni paint makes more
Use anatase titanium; use rutile titanium; In the developed countries
The interior and exterior walls are basically rutile - type titanium white.
Commonly used fillers are calcium carbonate, talc powder, sericite powder, gao ling
Soil, silica fume, lithopone, quartz powder, ultrafine aluminum silicate, sulfuric acid
Both heavy and light calcium belong to calcium carbonate, of which heavy calcium is the natural mineral
Stone is crushed and light calcium is a synthetic product. Among the many fillers, weight
Calcium should be said is in emulsioni paint usage amount is the biggest, most stable, cheapest
Packing; Although light calcium also has a little dry covering power, suspension is also good,
But easy to start white frost, stability is poorer.
Many interior wall latex paint formulations also use a little talcum powder, though
It is easy to powder, but can improve the construction and leveling of emulsion paint.
Sericite powder belongs to layered silicate, is scale crystal, acid resistant
Good alkali resistance and chemical stability. It can be used in exterior and interior latex paint
Appropriate use, on the one hand can greatly improve the weather resistance of paint film, prevent
Water vapor penetration, on the other hand to prevent powder and paint cracking.
Another important filler is kaolin, which is easily dispersed in water, white
High degree, strong dry covering, thixotropic, paint stability
And in good shape. Through experimental study, we found that the ultrafine 4 000 order
Kaolin and titanium dioxide can be used to improve the covering power of the coating
Comprehensive performance. In white latex paint, silica fume has a bright color
Adjust, can enhance the hardness of paint film, but also improve the durability and resistance of the film
According to the characteristics of the different fillers described above, the inner wall latex paint in general
Products with high whiteness such as heavy calcium, light calcium, talc powder and kaolinite;
Sericite, barium sulfate, wollastonite powder,
Calcined kaolin, etc. Should choose flexibly according to price, demand.
Although at present the production technology of emulsioni paint is increasingly mature with the technology
The increasingly progressive innovation of art is still developing, while our country until the 20th century
In the early 1990s, with the entry of multinational companies into China brought new
Material, new technology, just begin rapid development. Improve cost performance and increase
Function, low cost, low VOC (volatile organic compounds), low gas
Taste, environment friendly type emulsioni paint will become the mainstream.
To obtain high cost performance emulsion paint required to fine the relevant raw materials
For in-depth comparative research and selection, not raw material piling, no
To obtain good market returns, we must optimize the formulation.
The Selection of Raw Materials for Interior/Exterior Latex Paint
Yang Wenyuan (Taizhou Quad Chemical Co., Ltd., Jiangsu Taizhou, 225312, China)
Abstract: The selection of raw materials for interior/exterior latex paint were brief discussed in order to prepare The
Latex paint with high price performance ratio.
Key Words: interior latex paint; Exterior latex paint; Raw material
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