CN102108258A - Aqueous polymer damping paint - Google Patents

Abstract

The invention discloses aqueous polymer damping paint, which comprises: terpolymer interpenetrating network emulsion, which serves as a base stock; sericite, expanded graphite, silicon-and-aluminum-based hollow microspheres, hydrous magnesium oxysulfate whiskers, ammonium polyphosphate, chlorinated paraffin and antimonous oxide, which serve as fillers; and a dispersant, a substrate wetting agent, a defoaming agent, a rheological agent, a mouldproof bactericide and a coupling agent, which serve as assistants. The aqueous polymer damping paint is prepared by weighing the components in a ratio, adding the components into a low-speed stirrer in turn, uniformly mixing, filtering by a vibrating screen and discharging. The paint has high vibration and noise absorbing performance, wide damping temperature range, high mechanical performance, high vibration-inhibition and noise-reduction performance, high thermal-insulation and sound-absorption performance, high flame-retarding performance, and low volatile organic compound (VOC) content. The paint is widely used for spraying air planes, carriages of high-speed trains and shells of inner walls of tires.

Description

A kind of waterborne polymeric damping paint

Affiliated invention field

The present invention relates to the metal coating material technical field, relate to a kind of waterborne polymeric damping paint specifically.

Background technology

Develop rapidly along with modern science and technology, the harm of vibration and noise becomes increasingly conspicuous, the research of the metallic paint of against shock and noise reduction sound also puts on the agenda day by day, and developed the effective ways and the technical measures of multiple solution vibration and noise, wherein the polymer damping paint is subjected to people and more and more pays close attention to its superior vibration damping, decrease of noise functions.Polymerizable aqueous base damping paint be a kind of be matrix with the waterborne polymeric, under the cooperation of filler and auxiliary agent, the vibration and noise reducing coating of preparation, it is sprayed on the inner wall housing such as aircraft, bullet train railway carriage, tire, can reaches the purpose that suppresses hull vibration and reduce noise.Polymer materials has higher damping value in the second-order transition temperature zone, but the second-order transition temperature zone of one-component polymkeric substance has only 20-30 ℃, and the variation of envrionment temperature generally can reach about 40 ℃, so a kind of good polymer damping material should have the glass transition zone more than 60 ℃, could satisfy the needs of different occasions preferably, obviously this is that one-component polymer materials institute is inaccessiable.In order to widen the damping temperature domain of superpolymer, improve the damping capacity and the Young's modulus of material, adopt interpenetrating(polymer)networks LIPN method or by the emulsion blending method, two kinds of acrylic emulsions that are about to different Tg are carried out blend, add filler then and auxiliary agent is made into coating.Interpenetrating net polymer is since the sixties in 20th century, obtained developing rapidly, LIPN is because internetwork IPN has limited being separated between polymkeric substance, caused and forced mutual appearance, and the synergistic effect of polymkeric substance, thereby improved the consistency of component, can obtain wide temperature territory, high performance damping paint.How by being matrix with the LIPN emulsion, dose functional stuffing and auxiliary agent, the preparation damping paint makes that coating has that vibration and noise reducing is good, damping temp field width, mechanical property is excellent, heat insulation sound absorbent good, flame retardant properties is good, VOC content is low environment-friendly type

The waterborne polymeric damping paint is the problem that the current needs in present technique field solve.

The purpose of this invention is to provide a kind ofly have that vibration and noise reducing is good, damping temp field width, mechanical property is excellent, heat insulation sound absorbent good, flame retardant properties is good, VOC content is low environment-friendly type aqueous polymkeric substance damping paint.

In order to achieve the above object, the present invention by the following technical solutions, a kind of waterborne polymeric damping paint: with ter-polymers interpenetrating(polymer)networks emulsion is base-material; With sericite, expanded graphite, sial base cenosphere, hydration alkali magnesium sulfate crystal whisker, ammonium polyphosphate, clorafin, antimonous oxide is filler; With dispersion agent, base material wetting agent, defoamer, rheological agent, antimildew disinfectant, coupling agent is that auxiliary agent is formed, and each component was constructed as follows during prescription was formed:

Ter-polymers interpenetrating(polymer)networks emulsion 40-50%

Sericite 25-30%

Sial base cenosphere 5-10%

Expanded graphite 3-6%

Deionized water 3-5%

Ammonium polyphosphate 2-4%

Clorafin 42# 2-4%

Hydration alkali magnesium sulfate crystal whisker 2-4%

Antimonous oxide 2-4%

Dispersion agent H3204 0.3-0.8%

Base material wetting agent SF20 0.1-0.4%

Defoamer A36 0.2-0.4%

Rheological agent DSX-3800 0.2-0.4%

Antimildew disinfectant LXE 0.1-0.3%

Coupling agent KH-560 0.3-0.8%

Above-mentioned each component content is mass parts per-cent.

Above-mentioned described expanded graphite, hydration alkali magnesium sulfate crystal whisker, ammonium polyphosphate, clorafin 42#, antimonous oxide constitute organic and inorganic composite flame retardants.

The damping mechanism of polymkeric substance of the present invention is, single polymkeric substance damping temperature domain has only 20-30 ℃, and the effective damping functional zone are narrow, are difficult to satisfy actual requirement.By multi-component copolymer, blend and interpenetrating(polymer)networks method, can improve polymkeric substance the vibration and noise reducing performance, widen the damping warm area.Damping material also claims vibration attenuation material, when high molecular polymer contacts with vibrating object, will a part of mechanical vibrational energy changes thermal dissipation into and falls, thereby vibration damping is got off, and is mainly used in control vibration and noise.

The structure of the damping capacity of macromolecule polymer material and material itself is closely related.When producing vibration, be that friction between the segment of macromolecular material inside is to the contribution of damping capacity on the one hand; Be the contribution of filler and polymer segment and filler and filler on the other hand to the material damping performance.

The size of polymer damping capacity and its use temperature and frequency are closely related.High molecular polymer is this temperature transition zone of elastomeric state at glassy transition, be referred to as the glass transition zone, this transition temperature is called second-order transition temperature, and polymkeric substance is when the second-order transition temperature zone, and its damping peak value is the highest, effect of vibration and noise reduction is best.This is because when (glass zone), when external force acts on high molecular polymer, cause that bond distance and bond angle change, but this change is little fast again below second-order transition temperature, and is almost synchronous with STRESS VARIATION, so in-fighting is very little; In the second-order transition temperature district, the firm setting in motion of molecular chain, and system viscosity is very big, and chain movement is subjected to very big friction resistance, and response lag is in the variation of stress, and in-fighting is very big; When being higher than second-order transition temperature, the molecular chain movement comparison freedom that becomes, the in-fighting ability reduces.Therefore, estimate the height of macromolecule polymer material damping capacity, can be from considering aspect the height of the glass transition region internal loss factor (tan δ) peak value and the effective damping functional zone wide temperature range narrow two.Good damping material should satisfy three conditions: (1) in damping material use temperature and range of frequency, the dissipation factor peak value is than higher; (2) peak value of dissipation factor is wide, to guarantee that damping material has higher damping capacity in a big way, reduces its susceptibility to temperature and frequency; And ternary interpenetrating polymer networks soap-free emulsion material damping coefficient peak value height, number peak wide ranges to guarantee that damping material has higher damping capacity in a big way, reduces its susceptibility to temperature and frequency; Owing to cross one another between each polymer network infiltration, mechanical interlocking, play and force mutual appearance and synergistic effect effect, thereby improved the consistency of polymeric constituent; (3) have the composite multifunction type, damping material also should have sound absorption, inhales ripple, function such as heat insulation, fire-retardant, environmental protection except that having wide temperature, wideband, high damping peak value.Most of irregular particulate filler all has to some extent the damping capacity of coating and reduces, and it is more obvious especially to reduce degree during high filler loading capacity, and sheet, tiny balloon shape, bat wool can improve the damping capacity of coating.This is that contact area is big between filler and polymer molecular chain and filler and the filler because the specific surface area of these fillers is big, the vibration frictional coefficient height of generation, and the heat energy of conversion is big relatively, the ratio of damping height.Sheet structure mica, graphite are fillers first-selected in the damping paint; Hard shell class cenosphere such as ceramic hollow microballon, hollow glass bead, to float pearl etc. be customary filler in the damping paint; Inorganic fibre class such as glass fibre, sial fiber, mineral fibre, whisker etc. all are good damping fillers; In order to strengthen the flame retardant resistance of coating, improve the oxygen index of coating, increased the organic and inorganic composite flame retardants that constitutes by expanded graphite, hydration alkali magnesium sulfate crystal whisker, ammonium polyphosphate, clorafin 42#, antimonous oxide in the filler component.Clorafin is not only softening agent, also is a kind of fire retardant, hydrophober.Add an amount of clorafin in the damping paint, can improve snappiness, oxygen index and the water-repellancy of coating.Sb in clorafin and the inorganic combustion inhibitor ₂O ₃Have the cooperative flame retardant synergism, when coating was subjected to fire, the clorafin decomposes became HCL, HCH and Sb ₂O ₃Chemical reaction takes place to be generated English powder and further resolves into SbCL ₃Directly distillation absorbs a large amount of heats simultaneously and makes coating cooling, Sb ₂O ₃Cover coatingsurface and play fire retardation; SbCL ₃Enter the gaseous combustion district and generate RCL, HCL, Sb with free radical reaction in not so stage, these intermediate products, non-flammable gas water down oxygen concentration, produce the shroud of gas effect, thereby have improved oxygen index.Coupling agent in the auxiliary agent has two kinds of reactive groups of different nature, and the chemical group reaction of close inorganic group and inorganic surfaces forms strong chemical bonding; The parent has organic group to twine with reactive organic molecule or physics, thereby makes organic and inorganic materials interface realization chemical bonding.In damping paint, add an amount of coupling agent, can make organic and organic, organic on the one hand and mineral filler reaction bonding, bridge joint or winding, strengthen the mechanical property of coating, also can improve sticking power on the other hand with basic unit.Add the dispersion stabilization that dispersion agent has improved coating system in the auxiliary agent, prevent that filler grain is coalescent; Add the base material wetting agent, reduce the surface tension of water-borne coatings, improve wettability and the perviousness of coating, improve sticking power basic unit; At damping paint is to add the polymer defoamer in the damping paint of viscoelastic material, is in order to eliminate the bubble in the coating, to add rheology thickening material, antimildew disinfectant, improving the physicals of coating.

The present invention after testing, salient features is as follows:

Test item detected result detection method

℃-10～70 DMTA test of the warm territory of dissipation factor 〉=0.3

Dissipation factor peak value 0.58 DMTA test

Tensile strength/mpa 1.6 JG/T894-2001

Cohesive strength/mpa 1.2 JG/T894-2001

Fracture extensibility/% 210 JG/T894-2001

Sound absorption coefficient/% 70.2 GB/T14369-1993

Oxygen index/% 70.5 GB/T2406-1993

Thermal conductivity/[W/ (m.k)] 0.215 GB/T20473-2006

Smoke density grade/[A (＜15)] 6 GB/T8627-1999

1 grade of (AQ1) GA132-1996 of flue gas toxity safety

Can find out that from test result waterborne polymeric damping paint of the present invention has the glass transition wide temperature range; Dissipation factor peak value height; Tensile strength, cohesive strength, fracture extensibility, sound absorption coefficient and oxygen index height; The characteristics that smoke density grade and thermal conductivity are low and toxicity is little.

Embodiment

Below in conjunction with embodiment in detail the present invention is described in detail, related component content is all by mass parts per-cent, and a kind of waterborne polymeric damping paint: with ter-polymers interpenetrating(polymer)networks emulsion is base-material; With sericite, expanded graphite, sial base cenosphere, hydration alkali magnesium sulfate crystal whisker, ammonium polyphosphate, clorafin, antimonous oxide is filler; With dispersion agent, base material wetting agent, defoamer, rheological agent, antimildew disinfectant, coupling agent is that auxiliary agent is formed, and each component was constructed as follows during prescription was formed:

Ter-polymers interpenetrating(polymer)networks emulsion 45%

Sericite 27%

Sial base cenosphere 7%

Expanded graphite 4%

Deionized water 4%

Ammonium polyphosphate 3%

Clorafin 42# 3%

Hydration alkali magnesium sulfate crystal whisker 3%

Antimonous oxide 3%

Dispersion agent H3204 0.5%

Base material wetting agent SF20 0.2%

Defoamer A36 0.3%

Rheological agent DSX-3800 0.3%

Antimildew disinfectant LXE 0.2%

Coupling agent KH-560 0.5%

Claims (2)

1. waterborne polymeric damping paint: it is characterized in that: with ter-polymers interpenetrating(polymer)networks emulsion is base-material; With sericite, expanded graphite, sial base cenosphere, hydration alkali magnesium sulfate crystal whisker, ammonium polyphosphate, clorafin, antimonous oxide is filler; With dispersion agent, base material wetting agent, defoamer, rheological agent, antimildew disinfectant, coupling agent is that auxiliary agent is formed, and each component was constructed as follows during prescription was formed:

Ter-polymers interpenetrating(polymer)networks emulsion 40-50%

Sericite 25-30%

Sial base cenosphere 5-10%

Expanded graphite 3-6%

Deionized water 3-5%

Ammonium polyphosphate 2-4%

Clorafin 42# 2-4%

Hydration alkali magnesium sulfate crystal whisker 2-4%

Antimonous oxide 2-4%

Dispersion agent H3204 0.3-0.8%

Base material wetting agent SF20 0.1-0.4%

Defoamer A36 0.2-0.4%

Rheological agent DSX-3800 0.2-0.4%

Antimildew disinfectant LXE 0.1-0.3%

Coupling agent KH-560 0.3-0.8%

Above-mentioned each component content is mass parts per-cent.

2. according to the described waterborne polymeric damping paint of claim 1, it is characterized in that: described expanded graphite, hydration alkali magnesium sulfate crystal whisker, ammonium polyphosphate, clorafin 42#, antimonous oxide constitute organic and inorganic composite flame retardants.