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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




          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


          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




          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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