CN104910661A - Printed circuit board three-proofing paint used in low temperature environment - Google Patents

Abstract

The invention relates to the technical field of printed circuit board protection and concretely relates to printed circuit board three-proofing paint used in a low temperature environment. Polyvinyl butyral with good compatibility with epoxy resin is added into three-proofing paint raw materials so that paint cold resistance, impact resistance and adhesion to a base material are improved. Epoxy resin is subjected to ultrasonic treatment in a solvent so that epoxy resin surface activity is improved and epoxy resin is easily compatible with and reacts with other materials and thus reaction and curing rates are improved. The three-proofing paint has excellent toughness and adhesion, and has conventional three-proofing performances and excellent low temperature resistant performances. The paint film is tough and plump at a temperature of -70 DEG C, is not pulverized and does not crack for a long time, and satisfies circuit board daily protection requirements in a low temperature work environment.

Description

The anti-paint of a kind of low temperature environment printed circuit board three

Technical field

The present invention relates to printed circuit board guard technology field, be specifically related to anti-paint of a kind of low temperature environment printed circuit board three and preparation method thereof.

Background technology

Printed circuit board refers on insulating substrate, forms interconnect circuit and printed element from point to points according to predetermined design, is the supplier of electronic devices and components electrical connection.Circuit card is very common in daily life, little of mobile phone, USB flash disk, photographic camera, arrives greatly the high-end product such as space flight and aviation, high ferro motor-car.Along with the increase increasingly of electronics categories and quantity, improve the competitive power of electronic product, the quality of circuit card of keeping under strict control is particularly important link.In actual application, the environment for use complexity of circuit card is various, the environment such as humidity, high heat, salt fog, low temperature, vibrations, Gao Chen may be faced, if do not carry out corresponding effective protection, circuit card will occur rapidly that burn into is out of shape, goes mouldy, the problem such as aging, finally cause circuit malfunction, equipment breaks down.

In order to alleviate the destruction of external environment to circuit card, the normal operation of guarantee equipment, circuit board surface of being everlasting spraying protective paint, also three anti-paints are referred to as, its main chemical composition is acrylate, silicone, urethane, epoxy resin etc., principle of work forms layer protecting film at circuit board surface, damage from Working environment to make circuit card, thus promote the reliability of circuit card, it is short mainly to there is the protection cycle in existing three anti-paints, high temperature easily comes off, environmental pollutant can not be resisted, especially the corrosion of chemical pollutant, not easily reprocess, the shortcomings such as poisonous and harmful, therefore the anti-paint formula of improvement three is necessary, the over-all properties of further accentuator plate, promote protection effect, to meet the demand of integrated circuit technique fast development.

Summary of the invention

The object of the invention is to, there is provided a kind of low temperature environment printed circuit board three anti-paint, improve the problem that tradition three anti-paints are easy to crack in low temperature environment, peel off, make it in low temperature environment, still can keep good performance, more lasting effective protection circuit plate, in order to achieve the above object, the technical solution used in the present invention is as follows:

The anti-paint of a kind of low temperature environment printed circuit board three, it is characterized in that, this three anti-paint is made up of the major ingredient of 40-50 weight part and the auxiliary agent of 2-4 weight part, and major ingredient comprises the raw material of following weight part: polyisobutenyl succinic anhydride 1-2, normal hexane 8-10, sherwood oil 10-12, epoxy resin 32-40, pyromellitic acid anhydride 2-4, glycerine 2-3, methyl acrylate 12-15, polyvinyl butyral acetal 10-12, zinc acetate 0.1-0.2, HMPA 1-2; Auxiliary agent comprises the raw material of following weight part: negative ion powder 1-2, triethyl-phosphite 6-8, propylene glycol monomethyl ether 10-12, benzocyclobutene 4-6, α-amino isopropyl alcohol 2-4, boiled wood oil 12-15, lauryl glucosyl 2-3, Oils, bergamot peel 0.1-0.2, phenylcarbinol 4-6, polydimethylsiloxane 1-2;

The described anti-paint of a kind of low temperature environment printed circuit board three, its preparation method is as follows:

(1) preparation of auxiliary agent: first negative ion powder is mixed with lauryl glucosyl, triethyl-phosphite, 15-20min is ground after stirring, make negative ion powder slurry for subsequent use, benzocyclobutene, boiled wood oil are mixed with propylene glycol monomethyl ether, phenylcarbinol, stir 30-40min, then add other leftover materials mix and blend 20-30min, finally drip negative ion powder slurry, dropping limit, limit is stirred, and drips and terminates and get final product;

(2) auxiliary agent, glycerine, zinc acetate are added in normal hexane, sherwood oil mixing solutions, be heated to 35-50 DEG C, be stirred to material and dissolve dispersion completely, mixing solutions is for subsequent use;

(3) epoxy resin, polyvinyl butyral acetal are added in the material of step (2) gained, ultrasonic 20-30min, be warming up to 60-80 DEG C subsequently, add other leftover materials, 40-50min is stirred with the rotating speed of 400-500 rev/min, be cooled to room temperature after stirring terminates and get final product, finished product is finished using in 1-2h.

Compared with prior art, three anti-paint advantages prepared by the present invention are: on formula, add polyvinyl butyral acetal that can be well compatible with epoxy resin, can improve cold-resistant, shock-resistant ability and the sticking power with base material of coating; In technique by epoxy resin in a solvent through supersound process, improve its surfactivity, make the more easily compatible and reaction of itself and other material, add fast response and solidification rate; Three anti-paints prepared by the present invention possess excellent toughness and sticking power, conventional NBC protective performance can not only be realized, have more excellent resistance to low temperature, test result shows, being low to moderate, paint film in-70 DEG C of environment is still tough and tensile full, not efflorescence cracking in long-time, the daily protection of circuit card that can meet in lower Working environment is used.

Embodiment

Embodiment

Comprise 45 portions of major ingredients and 4 parts of auxiliary agents in the anti-paint of the present embodiment three, in major ingredient each component and weight part as follows: polyisobutenyl succinic anhydride 1, normal hexane 10, sherwood oil 10, epoxy resin 40, pyromellitic acid anhydride 3, glycerine 3, methyl acrylate 15, polyvinyl butyral acetal 10, zinc acetate 0.2, HMPA 2; In auxiliary agent each component and weight part as follows: negative ion powder 2, triethyl-phosphite 8, propylene glycol monomethyl ether 12, benzocyclobutene 6, α-amino isopropyl alcohol 2, boiled wood oil 14, lauryl glucosyl 3, Oils, bergamot peel 0.1, phenylcarbinol 6, polydimethylsiloxane 1.

The preparation method of these three anti-paints used for printed circuit board is as follows:

(1) preparation of auxiliary agent: first negative ion powder is mixed with lauryl glucosyl, triethyl-phosphite, 20min is ground after stirring, make negative ion powder slurry for subsequent use, benzocyclobutene, boiled wood oil are mixed with propylene glycol monomethyl ether, phenylcarbinol, stir 40min, then add other leftover materials mix and blend 30min, finally drip negative ion powder slurry, dropping limit, limit is stirred, and drips and terminates and get final product;

(2) auxiliary agent, glycerine, zinc acetate are added in normal hexane, sherwood oil mixing solutions, be heated to 35-50 DEG C, be stirred to material and dissolve dispersion completely, mixing solutions is for subsequent use;

(3) epoxy resin, polyvinyl butyral acetal are added in the material of step (2) gained, ultrasonic 30min, be warming up to 60-80 DEG C subsequently, add other leftover materials, 50min is stirred with the rotating speed of 500 revs/min, be cooled to room temperature after stirring terminates and get final product, finished product is finished using in 1-2h.

The performance test results of the anti-paint of the present invention three is:

Test event	Technical indicator
		Outward appearance	Paint film is smooth, light is plentiful
Coat-thickness (mm)	0.1-0.3
		Surface drying time (min, 25 DEG C)	≤10
Do solid work the time (h, 25 DEG C)	≤2
		Hardness of paint film (shore D)	70±3
Shock strength kg/cm	≥50
		Sticking power grade	≥4B
Salt fog resistance (25 DEG C × 48h)	Non-foaming, not stratified, do not come off
		Humidity resistance (65 DEG C × 48h)	Non-foaming, not stratified, do not come off
Acid-and base-resisting (68h)	Non-foaming, not stratified, do not come off
		Operating temperature range (DEG C)	-70-150

Above-mentioned test is all followed relevant criterion and is carried out.

Claims (2)

1. the anti-paint of low temperature environment printed circuit board three, is characterized in that, this three anti-paint is made up of the major ingredient of following weight part and auxiliary agent: major ingredient 40-50, auxiliary agent 2-4;

In described major ingredient, each component and weight part thereof are: polyisobutenyl succinic anhydride 1-2, normal hexane 8-10, sherwood oil 10-12, epoxy resin 32-40, pyromellitic acid anhydride 2-4, glycerine 2-3, methyl acrylate 12-15, polyvinyl butyral acetal 10-12, zinc acetate 0.1-0.2, HMPA 1-2;

The component that described auxiliary agent comprises and weight part thereof are: negative ion powder 1-2, triethyl-phosphite 6-8, propylene glycol monomethyl ether 10-12, benzocyclobutene 4-6, α-amino isopropyl alcohol 2-4, boiled wood oil 12-15, lauryl glucosyl 2-3, Oils, bergamot peel 0.1-0.2, phenylcarbinol 4-6, polydimethylsiloxane 1-2.

2. the anti-paint of a kind of low temperature environment printed circuit board three as claimed in claim 1, its preparation method is as follows:

(1) preparation of auxiliary agent: first negative ion powder is mixed with lauryl glucosyl, triethyl-phosphite, 15-20min is ground after stirring, make negative ion powder slurry for subsequent use, benzocyclobutene, boiled wood oil are mixed with propylene glycol monomethyl ether, phenylcarbinol, stir 30-40min, then add other leftover materials mix and blend 20-30min, finally drip negative ion powder slurry, dropping limit, limit is stirred, and drips and terminates and get final product;

(2) auxiliary agent, glycerine, zinc acetate are added in normal hexane, sherwood oil mixing solutions, be heated to 35-50 DEG C, be stirred to material and dissolve dispersion completely, mixing solutions is for subsequent use;

(3) epoxy resin, polyvinyl butyral acetal are added in the material of step (2) gained, ultrasonic 20-30min, be warming up to 60-80 DEG C subsequently, add other leftover materials, 40-50min is stirred with the rotating speed of 400-500 rev/min, be cooled to room temperature after stirring terminates and get final product, finished product is finished using in 1-2h.