(Polymer Dispersion in Waterproofing Applications)
type of waterproof material characteristics of the polymer latex
waterproofing materials commonly used in the role of latex
paint
-component waterproof coating waterproof membrane material (binder
) water-based products, ready to use, excellent performance,
variety of acrylic products, ethylene – vinyl acetate
(cement-based) two-component waterproof coating and cement together
constitute the film-forming material (binder system) water-based
products, on-site mixing before use, excellent performance,
long-term water-resistant acrylic acid, ethylene – vinyl
acetate
modified emulsified asphalt modified bitumen waterproof coating,
film-forming material (binder system), water-based products, that
is type, good performance, economical chloroprene, butadiene,
acrylic-based polymer waterproofing membrane
latex waterproofing membrane alone or with other materials (like
cement) constitute the binder system, non-polluting production
processes, excellent performance, easy to paste, simple in
construction safety, waterproof breathable acrylic acid, ethylene –
vinyl acetate
modified bitumen membrane asphalt modifier, binder system, improve
physical performance and temperature range of asphalt production
process is easy to disperse uniform, excellent high-solids SBR
latex
waterproof polymer modified waterproof mortar cement mortar
modified materials, improved flexural, impermeability, performance
bonding and other properties, integrated technology with good
performance acrylic, ethylene – vinyl acetate,
styrene-butadiene
1. 2 waterproofing membrane
Although the solid polymer modified bitumen membranes (SBS, APP,
etc.) added to the modified asphalt based, but there are solid
polymer dispersion and asphalt mixing process difficult, high
energy consumption, the polymer network in poor condition and other
shortcomings. In contrast, high-solids latex in hot asphalt when
modified with disperse easily, can be a good low, uniform polymer
fine particles, the polymer network to form a good, significant
effect modification, etc., as modified hot asphalt Another
advantage of a technology choice. Hot high solid content SBR
modified asphalt in the asphalt road are widely used in the
application of waterproofing materials will also play its proper
technical characteristics .
latex polymer based waterproofing membrane production is a class of
newly developed waterproof materials with traditional asphalt-based
membrane, polymer sheet, sheet compared to polymer-based latex
adhesive membrane material system and the system of water-based
adhesive filler affinity good latex adhesive polymer membrane
itself can be used or cement paste, which makes the coil
construction process more simple, safe, environmentally friendly
and reliable. Polymer-based latex with waterproof breathable
waterproof membrane, the mechanical properties of good technical
characteristics, is developing a class of highly promising new
generation of waterproof material.
1. 3 waterproof mortar mortar
increase the density of water (permeability), to overcome the risk
of cracking caused by shrinkage of mortar is rigid waterproof
materials, key technologies, which conducted cement modification
can be described as a matter of opinion, a wide variety of cement
admixtures, short fiber reinforced polymer latex material and some
of them are on the application, shown in Table 2.
Table 2, plus a modified waterproof mortar material (Waterproofing
Mortar Modifiers)
type of inorganic polymer admixture admixtures of organic
fibers
plus
Materials
superplasticizer expanders mainly cellulose and polyvinyl alcohol
products mainly for acrylic, styrene-butadiene, ethylene vinyl
acetate latex mainly for high-intensity short-fiber
impact
role in maintaining the workability of mortar construction under
the premise of properly to reduce water consumption.
no improvement on the use of flexible materials, cement and water
to form cement volume expansion to compensate for material
shrinkage.
no improvement of the cement materials have a certain flexibility
and reduced water conservation by improving the material conditions
to improve performance.
improve on cement materials is very limited flexibility. There are
some improvements due to reduced water and materials conservation
conditions to improve performance. varying degrees of
improvement
cement materials can be flexible. The use of fiber strength and
elongation compensation shrinkage stress.
limited flexibility to improve on cement
instructions to other parts of the cement to reduce shrinkage, but
with less low prices. Part of the cement can reduce the shrinkage,
but with less low prices. Part of the cement can reduce the
shrinkage, but lower prices can be less amount of the total
elimination of cement shrinkage, but the price is relatively high
shrinkage of cement can be partially reduced, generally as an
adjunct
use of polymer latex modified cement material can effectively
improve the permeability of the material to improve its
flexibility, bond strength and other important application
performance, and modified according to application requirements to
determine the extent of the rigid – hard and soft play materials as
much as possible within the context of the performance advantages.
The use of polymer latex modified waterproof mortar better overall
technical performance, development outlook.
total above, the polymer latex waterproofing materials in the
application is very broad, either as principal or as a binder
modified materials are waterproof material and technological
progress has played an active role. As a water-based materials, is
environmentally friendly waterproof material basis for the
development, showing a growing market prospects.
waterproof material development and in different applications,
according to the material requirements of technical performance and
economic considerations, may choose a different polymer latex, but
as the field of water, the polymer latex have a common technical
requirements, which aggregate material latex film, the film should
have good stability, aging resistance, water resistance and
suitable mechanical properties. In general, the use of specially
developed acrylic latex is more appropriate for the application of
materials used for waterproofing.
2 polymer latex in a waterproof coating application
2. 1
waterproof coating market situation as part of the organic
composition of waterproof material, with statistics show that in
1999 China total production of waterproof coating about 16
million tons, equivalent to total waterproof material less than 10%
total, of which water-based (environmentally friendly) polymer
latex-based waterproof coating (not including modified asphalt
coating) yields about 1.3 million tons, accounted for 8% of the
amount of waterproof paint around.
2010 years, China overall development of waterproof material
projected growth rate of 2.5%, Monster Beats by dre
Pro, restructuring is expected to waterproof coating ratio from
10% to 12-15%, about 25 million tons, expected product composition
(water base) polymer latex waterproof coating waterproof coating
and the overall proportion of from 8% to 20%.
Figure 1, China development forecast
waterproof coating waterproof coating waterproof membrane market
faster than other waterproof material represented, because on the
one hand because of its waterproofing membrane production base has
been very large, red and blue beats
by dre, the development of space is limited, on the other hand,
in recent years, China technological progress and waterproof
coating expanding range of applications, from environmental
protection and technical performance waterproof coating both, are
water-based (environmentally friendly) polymer waterproof coating
market needs to create the conditions, the polymer latex-based
waterproof coatings, high-speed development has become an
indisputable fact. The current focus should be to consider how to
guide the waterproof coating manufacturer from raw materials,
formula, process, etc. to ensure product quality polymer waterproof
coating to keep the good image and market momentum.
2. 2 type polymer latex waterproof coatings and benefits
polymer latex-based waterproof coating is divided into two types,
namely, the one component without cement, cement products and with
the double component products. One-component paste-type products,
on-site direct brushing applications; two-component liquid product
from the two separate packaging materials and powder form, with two
copies at the scene by the proportion of mixture, stirring evenly
brushing after application.
polymer latex waterproof coating is water based (environmentally
friendly) products, has the following significant advantages.
< br /> 1. adhesion, good integrity, the shaped surface, a large number of
outstanding waterproof surface structure of the complex base
surface, waterproof coating can also be very easy to form a
waterproof coating integrity.
2. construction of simple and flexible, regardless of the size of
the work surface, current status, is the elevation or the top,
waterproof coating can be construction.
3. on the base surface humidity is low, and solvent-based coatings
and solvent-based adhesives used in different construction of the
membrane, the polymer latex waterproof coatings for water-based
products, is not particularly limited to the moisture content of
grass-roots level, a certain degree of moisture in the surface of
the base construction.
4. and mortar, tile adhesive affinity (adhesion) is good, covered
in a waterproof coating on the mortar and other materials,
generally do not need sand that is thrown with good adhesive
properties.
5. environmentally friendly, non-toxic polymer latex waterproof
coating solvent evaporation, the construction workers or the
environment, even in poorly ventilated basements and narrow space
between the kitchen and toilet construction, they must not endanger
persons.
2. 3 polymer latex waterproof coating selection technical
requirements and latex polymer latex < br />
waterproof coating as the rapid development of product technical
requirements specification has been on the agenda, have been
discussed and developed a single, two-component waterproof coating
the national industry standards, to the present, one-component
waterproof coating industry has been the introduction of the draft
standard, draft standard two-component waterproof coating industry
has been through discussion. In this film not only lists the
technical requirements for processing, in Table 3.
Table 3, the waterproof coating technology requirements (Technical
Requirment for Waterproofing Coatings)
< br /> material type two-component one-component waterproof coating
waterproof coating
I type I type II type Type II
tensile strength, MPa 1.5 0.8 1.2 1.5
Elongation,% 300 400 200 80
low temperature flexibility, Φ10mm around the bar -20 ℃ -10 ℃ -20 ℃
-5 ℃
not permeable, 0.3 Mpa, 30 min impermeable impermeable impermeable
impermeable
purely from the technical requirements of view, many polymer latex
modified by the appropriate after they meet the technical
requirements. However, the waterproof coating applications has its
specificity, if the polymer can not withstand the test of long-term
moist or wet and dry cycles, it may gradually lose its water
resistance.
Figure 2 shows the comparison of different polymer absorbent,
absorbent polymers influenced their water resistance. Figure 3
compares the three cycles of wet and dry polymer in a number of
quality losses, poor water resistance of the polymer mass loss,
thus, inevitably affect its technical performance.
In addition, the waterproof coating of different formulations also
affect the performance of their applications to two-component
waterproof coating, for example, increase the amount of latex
polymer increases, the improvement of flexible material while the
material is based on the gradual loss of cement Some properties,
such as water resistance, strength, permeability, etc. for the
price. Figure 4 for the different conditions of polymer modified
cement ratio , flexible cement material in the air after immersion
in water conservation and the tensile strength of performance
comparison.
Figure 2, Beats by dre Diamond
white, 24 -hour water absorption (Water Absorption), (%)
wet and dry cycles, 2 times a week. (Wet-dry cycle, 2 cycle /
week)
< br /> Figure 3, after several cycles of wet and dry mass loss rate
(weight change after cycle ),(%)< br>
seen from Figure 4, with the poly- cement ratio increases, the
flexible polymer modified cement material increases, a
corresponding reduction in its tensile strength, which is the
inevitable trend of the performance of materials technology. But it
is worth noting that the strength of materials after long-term
immersion in varying degrees, has declined. Higher degree of
modification, such as poly cement ratio is 2.0, three days after
flooding even lower than the tensile strength of 0.5 Mpa.
Figure 4, different poly-cement ratio and curing conditions the
material tensile strength
(Tensile strength, different P / C and curing conditions)
for intermittent water and no external force applied in terms of
ordinary roofing, water-related conflicts are not prominent, the
focus of attention is the crack resistance of materials, which is
typically polymer modified cement-based waterproof materials, the
reasons for the pursuit of high elongation. But for long-term water
requirements of underground engineering and possible long -term
moist toilet guard between the application, the material should be
considered long-term water-resistant strength, low ash than the
waterproof coating polymer because of its good water resistance, is < br /> more suitable for such applications.
2. 4 polymer latex waterproof coatings outlook
recent years, water-based (environmentally friendly) polymer
waterproof coating because of its environmentally friendly, Authentic Monster Beats, technical
performance, and good economic reasons developed rapidly, with the
development and improvement of its technology, the application of
waterproof coatings can be expected to be more extensive.
Water-based polymer waterproof coating in the future need to
improve the main technical content:
? further improve the water-based polymer
film ;
? further improve the aggregate the physical
properties of film material, to broaden the application temperature
range;
? construction of low-temperature conditions to
overcome difficulties, improving low-temperature film-forming
properties.
With more development and improvement of technology, a new
generation of environmentally friendly waterproof coating to its
wide temperature adaptation, technology, performance, construction
easier and faster, overall economic performance of the advantages
of a waterproof coating of mainstream products.
3 polymer latex in a waterproof mortar application
3. 1 polymer-modified mortar market situation
Although a large number of cement plus modified materials,
especially cement admixture for waterproofing rigid, Monster Beats Studio
Lamborghini, but the diversity of material application and
cross application and other reasons, almost no more credible
statistical data reflect market conditions waterproof mortar.
< br /> polymer latex modified mortar as a cement material in China in
recent years gradually been concerned about the applications
continue to expand, but the main body as a paste material and
repair material application . Basically, for economic
considerations, waterproof mortar cement additives for modification
of a large number of uses.
last couple of years, China southern wall leakage prominent latex
polymer modified waterproof mortar for its excellent technical
performance of the integrated work and gradually accepted and
adopted, I believe that with the successful application of the
field experience, applications of such materials will continue to
grow.
3. 2 polymer modified waterproof mortar technical performance
rigid polymer latex-modified cement-based waterproof materials,
technology is the key ways to improve and increase the density
waterproof mortar and flexible, The former is the basis for water
impermeability, which will effectively overcome the risk of mortar
cracking caused by shrinkage.
study, a specially developed polymer latex cement mortar on the
technical performance improvements are many and significant, mainly
in the following areas, only a brief discussion in this waterproof
mortar impermeability of most direct concern and crack
resistance.
? significantly improve mortar adhesion
? significantly improve the wear resistance of
mortar significantly increased
? mortar The chemical resistance
? significantly improve the crack resistance of
mortar
? significantly improve the impermeability of
mortar
Figure 5 increase the amount of polymer modified mortar for water
absorption when compared to the polymer increases with increased
visibility, decreased water absorption of mortar. This is mainly
due to the polymer film and the dense cement mortar filling the
pores, significantly reducing the water absorption of mortar to
waterproof mortar impermeability of the contribution.
Figure 5, the water absorption of modified mortar (Water Absorption
of PMM),%
Figure 6 plus the amount of different polymer modified mortar
cracking when compared to the situation seen from the diagram,
relationship between the amount of polymer added to compensate for
shrinkage of the cement quality, low modification degrees (poly
gray or less than 0.1) while the cement hardened to absorb part of
the initial stress can also play a role, and stress is not modified
beyond the scope of the cement material stress limits still play a
bridging role, but as time goes by and the deepening of the cement < br /> hardened, the risk of brittle fracture will occur.
further increase the amount of polymer can effectively improve the
situation, slightly higher modification degree (0.2 or higher
poly -ash), the polymer chain as more participatory role in
hardening cement will be produced by stress be increased by
reducing the elastic and plastic deformation, which can effectively
overcome the long-term shrinkage problem. Figure 0.2 Poly ash,
acrylic modified water-cement ratio of 0.4 in the study period, and
can expect a longer period, there will not be stress cracking
problems.
△ together gray than 0.2 (P / C 0.2), □ gather dust than 0.1, ring
fracture (P / C 0.1, Cracking)
◇ gather dust than 0 , ring fracture (P / C 0, Cracking)
Figure 6 Comparison of modified mortar crack (Anti-Cracking Compare
of PMM)
In summary, the polymer latex can be significantly modified
waterproof mortar increase the density waterproof mortar and
flexible, thus improving the water permeability of mortar and crack
resistance.
3. 3 polymer modified waterproof mortar outlook
latex polymer modified waterproof mortar in China in recent years
gradually been concerned, has been applied in the field of
water-proof wall, and its excellent overall performance and
technical advantages gradually been recognized, I believe in the
appropriateness of using rigid waterproof material applications,
will continue to expand its market share.
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