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EN | 中文

Selection of raw materials for interior and exterior latex paint

Publication time:2018.08.17 10:30

Times of browsing:

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

 

Practical technology

 

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

 

Uniform elements.

 

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

 

TEXANOL

 

5 to 7

 

13 film forming assistant

 

TEXANOL

 

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

 

No.4 45

 

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

 

Generally 10.5%~12.5%.

 

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

 

To balance.

 

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

 

Barium, etc.

 

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

 

Grinding.

 

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.

 

3 conclusion

 

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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