CN109141672A - A kind of electrical equipment temperature alarm indicator and preparation method thereof - Google Patents
A kind of electrical equipment temperature alarm indicator and preparation method thereof Download PDFInfo
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- CN109141672A CN109141672A CN201811244116.4A CN201811244116A CN109141672A CN 109141672 A CN109141672 A CN 109141672A CN 201811244116 A CN201811244116 A CN 201811244116A CN 109141672 A CN109141672 A CN 109141672A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
- G01K11/16—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of organic materials
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Abstract
The invention discloses a kind of electrical equipment temperature alarm indicator, including 10~30 parts of color-change powder, 2~10 parts of encapsulating material, 1~5 part of aminopropyl aminoethyl dimethoxysilane, 5~10 parts of organic solvent, 0.1~5 part of organic dispersing agent, 0.5~25 part of water-based thickener, 0.2~4 part of nonionic surfactant, 0.5~5 part of defoaming agent, 10~20 parts of fire retardant, surplus is water；The color-change powder includes at least one of monoazo class, bisazo class, dione pyrrolo-pyrrole organic pigment, and the encapsulating material includes organic acid.Also disclose the preparation method of the indicator.Indicator temperature indicating section of the invention is stablized, and has preferable coating, stability, anti-flammability, adhesive force and insulation performance, and hardness of film is higher, Thermo-sensitive and heat-resist, is able to satisfy the requirement of most of electrical equipments.
Description
Technical field
The present invention relates to a kind of thermochromism indicator and preparation method thereof more particularly to it is a kind of can be in determined temperature section
The irreversible thermochromism indicator that color change occurs, the temperature alarm especially suitable for electrical equipment indicate.
Background technique
Heat-sensitive indicator is a kind of material to change colour with variation of ambient temperature, by color dynamic instruction temperature, simply
It is convenient.Temperature change material is divided into Reversible temperature change material and can not two kinds of material of inversion change.Wherein Reversible temperature change material category is more, with
Raising and reducing for temperature, the variation of color there is reversible feature, but this kind of material is because have the characteristics that reversible color,
The overheat instruction of electrical equipment is not suitable for.Can not inversion become instruction material color change be presented in some temperature spot after heated
Change, color is no longer restored after cooling, whether conducive to the generation for tracing overheat condition.Can not inversion become instruction material main component
It is provided with the matrix of thermochromism color base, the receptor for causing discoloration, the solvent for adjusting temperature and other influence viscosity and sprawls
The additive of performance, technological difficulties are: material protects color, no natural decolourization to needs well at normal temperature, and is setting temperature
It is able to achieve discoloration under degree, and still keeps the color change state after cooling.
It may be because many reasons when electrical equipment operation and electronic component caused to overheat, such as because conductor cross sectional area is too small
And overload, or because caused by the reasons such as coupling compression joint is not tight resistance it is excessive, or decreasing insulating after dampness, so that insulated electro
Resistance reduction etc..Electronic component overheat is easy to that it is made to burn or even cause fire, causes great security risk, therefore even if
Post drop, it is also desirable to record this and cross thermal history, play a warning role.
There are mainly two types of forms for the overtemperature instruction material of existing electrical equipment: one is temperature to become paster, this paster
It is inconvenient for individual narrow spatial operations；Another kind is ink, and this instruction material operation is simple, but there is also as follows
Disadvantage: (1) viscosity is relatively low, tear stains shape sagging is easily presented after coating or the stream that hangs down；(2) solution storage stability is poor, is easy sedimentation point
Layer；(3) cohesive force is insufficient or too strong, leads to the too strong replacement for influencing electronic component of easy to fall off or cohesive force after coating；(4) absolutely
Edge scarce capacity easily leads to electric leakage.
Summary of the invention
For the above-mentioned deficiency of the prior art, technical problem to be solved by the invention is to provide a kind of irreversible thermotropic changes
Color indicator can realize discoloration, sensitivity by the reasonably combined of colour-changing agent and other components in relatively narrow temperature range
Height, room temperature colour retention, coating, storage stability and cementability are good, and insulation and excellent fireproof performance can be used for electrical equipment mistake
Thermal warning instruction.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of electrical equipment temperature alarm indicator, including following raw material by weight percentage:
10~30 parts of color-change powder, 2~10 parts of encapsulating material, 1~5 part of aminopropyl aminoethyl dimethoxysilane, You Jirong
5~10 parts of agent, 0.1~5 part of organic dispersing agent, 0.5~25 part of water-based thickener, 0.2~4 part of nonionic surfactant, disappear
0.5~5 part of infusion, 10~20 parts of fire retardant, surplus is water；The color-change powder includes organic pigment, and the organic pigment is selected from
At least one of monoazo class, bisazo class, dione pyrrolo-pyrrole organic pigment, the encapsulating material includes organic
Acid.
Preferably, the monoazo class organic pigment is selected from monoazo calcium salt color lake and/or monoazo strontium salt color lake, described
Bisazo class organic pigment is bisazo benzidine class organic pigment.
Preferably, the color-change powder further includes inorganic filler, the weight ratio of the organic pigment and the inorganic fillers
For 7:3.It is furthermore preferred that the inorganic filler in aluminium oxide, silica, zirconium dioxide, kaolin and barium sulfate extremely
Few one kind.
Preferably, in the encapsulating material, organic acid is arachic acid；It is furthermore preferred that further including ethylene-methyl acrylate
Copolymer EMA, ethylene-acrylic acid copolymer EAA, ethylene-methacrylic acid copolymer EMAA and VA content is in 12% EVA
One kind or LDPE and EAA (AA content is 20wt%) blend, 50wt%LDPE/50wt%EMA blend, 70wt%
One of LDPE/30wt%EAA blend and 50wt%LLDPE/50wt%EVA (VA content is 12wt%) blend.
It is furthermore preferred that the encapsulating material uses ethylene acrylic acid co polymer EAA580 and arachic acid by weight for 1
~4:1 compounding.
Preferably, the water-based thickener is compounded using polyvinyl alcohol and polyacrylamide.It is furthermore preferred that the polyethylene
The weight ratio of pure and mild polyacrylamide is 1~10:1.
Preferably, the organic solvent is normal heptane.
Preferably, the organic dispersing agent is terpinol.
Preferably, the nonionic surfactant is fatty alcohol polyoxyethylene ether.
Preferably, the defoaming agent is phosphate.
Preferably, the fire retardant is melamine polymer.
It is further preferred that by weight percentage, the electrical equipment temperature alarm indicator includes following components:
10~30 parts of color-change powder, 2~5 parts of ethylene acrylic acid co polymer, 0.5~2 part of arachic acid, 5~10 parts of normal heptane,
0.5~1 part of terpinol, 0.5~20 part of polyvinyl alcohol, 0.5~2 part of polyacrylamide, aminopropyl aminoethyl dimethoxysilane 1
~5 parts, 0.5~2 part of fatty alcohol polyoxyethylene ether, phosphoesterase 30 .5~2 part, 10~20 parts of melamine polymer, surplus is water.
The present invention also provides the preparation methods of above-mentioned electrical equipment temperature alarm indicator, comprising steps of
S1, encapsulating material is dissolved with organic solvent, color-change powder then is added and organic dispersing agent stirs evenly, is encapsulated
Color-change powder solution；
S2, the color-change powder solution being encapsulated is added to the water under stirring, sequentially add water-based thickener,
Fire retardant, aminopropyl aminoethyl dimethoxysilane, defoaming agent, are eventually adding nonionic surfactant, and stirring is solidifying to homogeneous
It is gluey.
Preferably, in the step S1, the partial size after the color-change powder is encapsulated is 1~10 μm.
Beneficial effects of the present invention:
In instant component, monoazo class, bisazo class and dione pyrrolo-pyrrole red colour system organic pigment can be
Red by pale pink purpling when temperature range is 65~90 DEG C, temperature range is narrow, and Thermo-sensitive is good, avoids fluctuating because temperature becomes range
Occur greatly accidentally indicating, and heat-resist (150 DEG C of heat resisting temperature >), is able to satisfy the requirement of most of electrical equipments.
Organic acid can protect organic pigment from the erosion of other chemical substances well, improve the stability and Bao Se of organic pigment
Property.Aminopropyl aminoethyl dimethoxysilane is used to improve the electrical insulating property of indicator.Further add specific quantity dispersing agent,
Water-based thickener, nonionic surfactant, defoaming agent and fire retardant adjust color-change powder by the reasonably combined of each component
The viscosity and adhesive property of dispersibility and product, make product be easy to coat, and have insulation, antivibration anti-dropout and fire-retardant property
Energy.Due to invention can be widely used in the temperature alarm instruction of electrical equipment, improving electrical equipment with above-mentioned excellent properties
Safety in utilization.
Specific embodiment
The present invention will be described in detail With reference to embodiment.It should be understood that described herein
Specific embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
Design of the invention are as follows: using organic acid to monoazo class and/or bisazo class and/or dione pyrrolo-pyrrole
Organic pigment is encapsulated, and color change, and heat-resist (heat resisting temperature > 150 can occur within the scope of relatively narrow temperature
DEG C), it is able to satisfy the requirement of most of electrical equipments.In addition, organic acid can protect organic pigment from other changes well
The erosion for learning substance, improves the stability and colour retention of organic pigment；Aminopropyl aminoethyl dimethoxysilane refers to for improving
Show the electrical insulating property of agent.On this basis, pass through dispersing agent, water-based thickener, nonionic surfactant, defoaming agent and fire-retardant
Agent it is reasonably combined, adjust the dispersibility and product viscosity and adhesive property of color-change powder, product made to be easy to coat, and have exhausted
Edge, antivibration anti-dropout and fire-retardant performance.Temperature-sensitive section of the invention is 65~90 DEG C, carries out early warning in the temperature range and refers to
Show, being avoided that influences equipment operation because of overheat, improves the safety in utilization of electrical equipment.
Electrical equipment temperature alarm indicator provided by the invention contains following raw material by weight percentage: color-change powder
10~30 parts, 2~10 parts of encapsulating material, 1~5 part of aminopropyl aminoethyl dimethoxysilane is 5~10 parts of organic solvent, organic
0.1~5 part of dispersing agent, 0.5~25 part of water-based thickener, 0.2~4 part of nonionic surfactant, 0.5~5 part of defoaming agent, resistance
10~20 parts of agent of combustion, surplus is water；The color-change powder includes organic pigment, and the organic pigment is selected from azo and/or pyrroles
And the organic pigment of pyrrole-dione, the encapsulating material include organic acid.
The composition of color-change powder is not particularly limited in the present invention, to meet the requirement that electrical equipment temperature alarm indicates, only
The heat resistance having had is needed, 150 DEG C or more of high temperature is resistant to, wherein organic pigment is preferably monoazo pigment, double
Azo joins at least one of pigment and dione pyrrolo-pyrrole organic pigment, wherein the monoazo class organic pigment is preferred
Monoazo calcium salt color lake and/or monoazo strontium salt color lake, the bisazo class organic pigment are preferably bisazo benzidine class.It is excellent
Choosing, inorganic filler is also added in the color-change powder, the inorganic filler can be selected from aluminium oxide, silica, titanium dioxide
At least one of zirconium, kaolin and barium sulfate.Preferably, the inorganic filler partial size is preferably 50~300 nanometers, more preferably
Using the inorganic filler modified by non-ionic surface, the dispersibility and sedimentation stability of pigment, such as this hair can be significantly improved
The Nano-meter SiO_2 modified through Silane coupling agent KH550 that bright specific embodiment uses2.Most preferably, the inorganic fillers with
The weight ratio of organic pigment is 3:7.Inventor has found after further investigation, when the inorganic fillers content is aforementioned proportion
When, it can be built into rigid network, good supporting role is played to the organic pigment, while can be reduced amount of pigment, reduced
Material cost.
The type of encapsulating material is not particularly limited in the present invention, to make 65~90 DEG C of temperature range, the copolymer
Fusion temperature range be 60~100 DEG C, when hardening again be transparent after hot melt state and hot melt.Preferably, described organic
Acid is arachic acid.It is furthermore preferred that the encapsulating material further includes ethylene-methyl acrylate copolymer EMA, ethylene-acrylic acid
Copolymer EAA, the ethylene-vinyl acetate copolymer that ethylene-methacrylic acid copolymer EMAA or VA content is 12wt%
EVA, or including one of following blend: LDPE is blended, 50wt%LDPE/ with EAA (wherein AA content is 20wt%)
50wt%EMA, 70wt%LDPE/30wt%EAA, 50wt%LLDPE/50wt%EVA (wherein VA content is 12wt%).It is described
Any one copolymer can choose the copolymer blended of a kind of commercially available trade mark or the two or more different trades mark, such as second
Alkene-acrylic copolymer can select EAA580 or EAA540, or using EAA580 and EAA540 blending etc..
For encapsulating material, most preferred scheme is to use ethylene acrylic acid co polymer EAA580 and arachic acid by weight
Than further improving for 1~4:1 compounding inventors have found that the collocation, which is applied to the present invention, can play better synergistic effect
To the isolation encapsulating effect of organic pigment, preferably protect color-change powder from the erosion of other chemical substances.
The type of other components is also not particularly limited in the present invention.Preferably, the water-based thickener uses polyethylene
Pure and mild polyacrylamide compounding, preferred scheme are that the weight ratio control of the two can adjusted viscosity in 1~10:1
Meanwhile more effectively avoiding occurring sagging when coating and the stream that hangs down, and guarantee the mechanical strength of film.Preferred polyvinyl alcohol molecule amount
It is 70,000~120,000, acidolysis degree is 86.0~90.0 [% (mol/mol)].The molecular weight of preferred polyacrylamide is lower than 800
Ten thousand.
The organic solvent is preferably normal heptane, and the organic dispersing agent is preferably terpinol, and the two collocation can play association
With the effect of dispersion color-change powder, color-change powder is effectively prevent to reunite.
Preferably, the nonionic surfactant is fatty alcohol polyoxyethylene ether R-O- (CH2CH2O)nH, preferably R=
C12~C18, n=3,5,6,7,9 can effectively improve the compatibility with other components, it is steady to obtain suitable fluidity and dispersion
It is qualitative.
Preferably, the defoaming agent be phosphate, prevent product prepare and coating when bubble formation, be better achieved with
Effective contact of electronic equipment, preferably tributyl phosphate.
The preferred melamine polymer of fire retardant, such as melamine, melamine cyanurate, melamine polyphosphate
Deng.Most preferred scheme is combined using the preferred plan of above-mentioned all components, and anti-flammability and other can be preferably taken into account
The equilibrium of performance.
A kind of specific embodiment according to the present invention, the electrical equipment temperature alarm indicator includes following components:
10~30 parts of color-change powder, 2~5 parts of ethylene acrylic acid co polymer, 0.5~2 part of arachic acid, aminopropyl aminoethyl two
1~5 part of methoxy silane, 5~10 parts of normal heptane, 0.5~1 part of terpinol, 0.5~20 part of polyvinyl alcohol, polyacrylamide 0.5
~2 parts, 0.5~2 part of fatty alcohol polyoxyethylene ether, phosphoesterase 30 .5~2 part, 10~20 parts of melamine polymer, surplus is water.
The present invention also provides the preparation methods of above-mentioned electrical equipment temperature alarm indicator, comprising steps of
S1, encapsulating material is dissolved with organic solvent, color-change powder then is added and organic dispersing agent stirs evenly, is encapsulated
Color-change powder solution；
S2, the color-change powder solution being encapsulated is added to the water, sequentially adds water-based thickener, fire retardant, ammonia third
Base aminoethyl dimethoxysilane, defoaming agent are eventually adding nonionic surfactant, stirring to homogeneous gel shape.
Stirring in step S1 is preferably ball milling, and revolving speed is 100~200r/min, and the time is 10~30min.
The preparation method of a kind of specific embodiment according to the present invention, the electrical equipment temperature alarm indicator includes
Step:
S1,2~5 parts of ethylene acrylic acid co polymer and 0.5~2 part of arachic acid are taken, is added 5~10 parts of normal heptane, stirring
To after being completely dissolved, 10~30 parts and 0.5~1 part of terpinol of color-change powder are added, is stirred in ball grinder with 150r/min
20min, the color-change powder solution being encapsulated；
S2, the color-change powder solution that is encapsulated is added in 25~45 parts of water, sequentially add polyacrylamide 0.5~
2 parts, 0.5~20 part of polyvinyl alcohol, 10~20 parts of melamine polymer, 1~5 part of aminopropyl aminoethyl dimethoxysilane, phosphoric acid
0.5~2 part of ester, it is eventually adding 0.5~2 part of fat alcohol polyoxyethylene ether, stirring to homogeneous gel shape.
Preferably, the partial size after the color-change powder is encapsulated is 1~10 μm.
Illustrate electrical equipment temperature alarm indicator provided by the invention and preparation method thereof below by way of specific embodiment.
In following embodiment and comparative example:
Polyacrylamide NPAM, molecular weight 600~8,000,000, effective content 90%.
Polyvinyl alcohol PVA24 88,44~54mPa.s of viscosity, acidolysis degree are 86~90% (mol/mol), the degree of polymerization 2300
~2500.
Melamine polymer is melamine cyanurate (MCA), and partial size≤4 μm, main content is >=99.5%.
Defoaming agent is tributyl phosphate TBP, content >=97.0%.
Fatty alcohol polyoxyethylene ether is purchased from BASF AG, trade mark TO7.
Silica is the Nano-meter SiO_2 of KH550 silane coupling agent modification2, 50~100nm of partial size, content 98%.
Monoazo pigment: paratonere 2030,300 DEG C of heat resistance, Colour index number P.R.254.
Disazo pigment: 2BP is red, heat resistance >=230 DEG C, color index: P.R.48:2.
Dione pyrrolo-pyrrole pigment: paratonere 254,280 DEG C of heat resistance, color index number: P.R.254.
Embodiment 1
2 grams and 1 gram of arachic acid of amount of ethylene acrylic acid co polymer EAA580 are taken, 10 grams of heptane, stirring, to complete is added
After fully dissolved, 20 grams and 1 gram of terpinol of color-change powder are added, 20min is stirred with 150r/min in ball grinder.It is then added to 42
In gram water, 1 gram of polyacrylamide is sequentially added, 10 grams of polyvinyl alcohol, MCA10 grams, aminopropyl aminoethyl dimethoxysilane 2
Gram, TBP1 grams, be eventually adding 1 gram of fatty alcohol polyoxyethylene ether, be stirred continuously to homogeneous gel shape.The color-change powder is titanium dioxide
Silicon is that 3:7 is compounded with organic pigment by weight, and wherein organic pigment is paratonere 2030, the color-change powder be encapsulated after it is flat
Equal partial size is 2 μm.
Embodiment 2
With embodiment 1, the difference is that, polyacrylamide therein is replaced with to the polyvinyl alcohol of same amount, it is described to have
Machine pigment be paratonere 254 and 2BP it is red be in mass ratio 5:1 collocation.
Embodiment 3
With embodiment 1, the difference is that, EAA580 therein is replaced with to the arachic acid of same amount.
Embodiment 4
With embodiment 1, the difference is that, in the color-change powder, organic pigment is that 2BP is red.
Embodiment 5
With embodiment 1, the difference is that, EAA580 therein is replaced with to the blend of the LDPE and EAA of same amount,
In, the weight percent that the weight percent of LDPE is 70%, EAA is 30%.
Comparative example 1
With embodiment 1, the difference is that, aminopropyl aminoethyl dimethoxysilane therein is replaced with into same amount
Water.
Comparative example 2
With embodiment 1, the difference is that, be free of melamine polymer MCA.
Test case
For the discoloring temperature of the indicator to embodiment 1-5 and comparative example 1, stability, anti-flammability, adhesive force, insulation
Property, coating and hardness are tested.Test result is as shown in table 1:
Table 1
As can be seen from the above results, indicator temperature indicating provided by the invention section is stablized, with preferable coating, surely
Qualitative, anti-flammability, adhesive force and insulation performance, hardness of film are higher.In addition, the comparison from embodiment 1 and embodiment 2 can
Out, when being compounded using polyacrylamide and polyvinyl alcohol in currently preferred ratio, coating is more preferable, and hardness is higher.From reality
When applying the comparison of example 1 and embodiment 3,5 and can be seen that using ethylene acrylic acid co polymer and arachic acid compounding, stability is more
It is good.It can be seen that from the comparison of embodiment 1 and comparative example 1 after aminopropyl aminoethyl dimethoxysilane is added, can guarantee film
Electrical insulating property.The resistance of material can be significantly improved as can be seen that melamine polymer is added from the comparison of embodiment 1 and comparative example 2
Performance and stability are fired, film comprehensive performance also significantly improves.
Claims (10)
1. a kind of electrical equipment temperature alarm indicator, which is characterized in that including following raw material by weight percentage:
10~30 parts of color-change powder, 2~10 parts of encapsulating material, 1~5 part of aminopropyl aminoethyl dimethoxysilane, organic solvent 5~
10 parts, 0.1~5 part of organic dispersing agent, 0.5~25 part of water-based thickener, 0.2~4 part of nonionic surfactant, defoaming agent
0.5~5 part, 10~20 parts of fire retardant, surplus is water；
The color-change powder includes organic pigment, and the organic pigment is selected from monoazo class, bisazo class, dione pyrrolo-pyrrole
At least one of organic pigment, the encapsulating material include organic acid.
2. electrical equipment temperature alarm indicator according to claim 1, which is characterized in that the organic face of monoazo class
Material is selected from monoazo calcium salt color lake and/or monoazo strontium salt color lake, and the bisazo class organic pigment is bisazo benzidine class
Organic pigment.
3. electrical equipment temperature alarm indicator according to claim 1 or 2, which is characterized in that the color-change powder is also wrapped
Include inorganic filler, the weight ratio of the organic pigment and inorganic fillers is 7:3.
4. electrical equipment temperature alarm indicator according to claim 3, which is characterized in that the inorganic filler is selected from oxygen
Change at least one of aluminium, silica, zirconium dioxide, kaolin and barium sulfate.
5. electrical equipment temperature alarm indicator according to claim 1, which is characterized in that in the encapsulating material, have
Machine acid is arachic acid, further includes EMA, EAA, EMAA, EVA (VA content 12%), LDPE and EAA (AA content is 20wt%) total
Mixed object, 50wt%LDPE/50wt%EMA blend, 70wt%LDPE/30wt%EAA blend and 50wt%LLDPE/
One of 50wt%EVA (VA content is 12wt%) blend.
6. electrical equipment temperature alarm indicator according to claim 5, which is characterized in that the encapsulating material uses
EAA580 and arachic acid are 1~4:1 compounding by weight.
7. electrical equipment temperature alarm indicator according to claim 1, which is characterized in that the water-based thickener uses
Polyvinyl alcohol and polyacrylamide are 1~10:1 compounding by weight.
8. electrical equipment temperature alarm indicator according to claim 1, which is characterized in that the organic solvent is positive heptan
Alkane, the organic dispersing agent are terpinol, and the nonionic surfactant is fatty alcohol polyoxyethylene ether, and the defoaming agent is
Phosphate, the fire retardant are melamine polymer.
9. a kind of preparation method of the described in any item electrical equipment temperature alarm indicator of claim 1-8, which is characterized in that
Comprising steps of
S1, encapsulating material is dissolved with organic solvent, color-change powder then is added and organic dispersing agent stirs evenly, the discoloration being encapsulated
Powder solution；
S2, the color-change powder solution being encapsulated is added to the water under stirring, sequentially adds water-based thickener, fire-retardant
Agent, aminopropyl aminoethyl dimethoxysilane, defoaming agent are eventually adding nonionic surfactant, stirring to homogeneous gel shape.
10. the preparation method of electrical equipment temperature alarm indicator according to claim 9, which is characterized in that the step
In rapid S1, the partial size after color-change powder is encapsulated is 1~10 μm.
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