CN112048276A - Shading glue for electronic product and preparation method thereof - Google Patents

Abstract

The invention discloses shading glue for an electronic product and a preparation method thereof, wherein the shading glue is prepared from the following components in parts by mass: 15-40 parts of polytetrahydrofuran glycol, 10-15 parts of polypropylene glycol, 10-20 parts of poly adipic acid-1, 6 hexanediol ester glycol, 2-10 parts of carbon black, 10-20 parts of tackifying resin, 20-35 parts of 4, 4' -diphenylmethane diisocyanate, 0.02 part of catalyst and 0.1-3 parts of silane coupling agent. The shading glue is a moisture-curing polyurethane hot melt adhesive, and has the advantages of high shear strength, good weather resistance, extremely high shading and light-shading effects, environmental friendliness and the like.

Description

Shading glue for electronic product and preparation method thereof

Technical Field

The invention relates to the technical field of modified resin adhesives, in particular to shading glue for shading an electronic product module and a preparation method thereof.

Background

Due to the continuous updating of electronic products or electronic components, the appearance and structural design of the products are more and more novel, so that the requirements for details are becoming more stringent. For example, the requirement of the circular hole shading and bonding of the camera also arises. At present, the existing glue in the market is difficult to meet the requirements, such as: the viscosity is high, and the precision construction is difficult; the shading effect is poor, and the light leakage phenomenon is easy to occur.

Therefore, how to overcome the defects that the existing shading glue has high viscosity and is difficult to construct precisely; the defects of poor shading effect and easy light leakage are problems to be overcome urgently in the industry.

Disclosure of Invention

The invention aims to solve the problems that the existing shading glue has high viscosity and is difficult to construct precisely; poor shading effect and easy light leakage, and provides the shading glue for the electronic product and the preparation method thereof, which are green, environment-friendly, and remarkable in bonding and shading effects.

The invention provides shading glue for an electronic product, which is prepared from the following components in parts by mass: 15-40 parts of polytetrahydrofuran glycol, 10-15 parts of polypropylene glycol, 10-20 parts of poly adipic acid-1, 6 hexanediol ester glycol, 2-10 parts of carbon black, 10-20 parts of tackifying resin, 20-35 parts of 4, 4' -diphenylmethane diisocyanate, 0.02 part of catalyst and 0.1-3 parts of silane coupling agent.

Preferably, the molecular weight of the polytetrahydrofuran diol and the molecular weight of the polypropylene glycol are both 2000, and the molecular weight of the poly adipic acid-1, 6 hexanediol diol is 3500.

Preferably, the catalyst is dibutyltin dilaurate.

Preferably, the tackifying resin is one or two of acrylic resin, carbon five petroleum resin or terpene phenolic resin.

Preferably, the silane coupling agent is gamma-methacryloxypropyltrimethoxysilane or gamma-jade pendants on a crown propyltrimethoxysilane.

Preferably, the carbon black is one or two of MA100, MA8 and MA7 in Mitsubishi chemical industry.

The invention also provides a preparation method of the shading glue for the electronic product, which is characterized by comprising the following steps of:

step 1: weighing the using amount of each component according to the proportion of the shading glue for the electronic product;

step 2: heating the polytetrahydrofuran glycol, the polypropylene glycol and the poly adipic acid-1, 6 hexanediol glycol to 120-140 ℃, fully dehydrating under the vacuum degree of less than 100pa, uniformly stirring, adding the carbon black and the tackifying resin, and dehydrating for half an hour to obtain a primary mixture;

and step 3: cooling the primary mixture to 85-95 ℃, adding the 4, 4' -diphenylmethane diisocyanate, and stirring for 70 minutes to obtain a secondary mixture;

and 4, step 4: adding the catalyst and the silane coupling agent into the secondary mixture, and continuing to react for half an hour;

and 5: and discharging, packaging, and placing in an oven at 80 ℃ for curing for 4 hours to obtain the shading glue for the electronic product.

Compared with the existing shading glue, the shading glue provided by the invention is a moisture-curing polyurethane hot melt adhesive, and is prepared by using polyester polyol, diisocyanate and chain extenders (butanediol, neopentyl glycol and the like) as basic raw materials, matching tackifying resin, catalysts and the like, and carrying out high-temperature polymerization reaction. The expected cross-linked network structure is formed after the reaction by designing the arrangement and combination of the raw materials, the cohesive energy of the hot melt adhesive product is high, the colloid is uniform and fine, and the complex network cross-linked structure formed after the complete reaction has good heat resistance, weather resistance, hydrolysis resistance and other properties. The added carbon black has excellent tinting strength, so that the glue can well achieve the effect of shielding a light source. The light-shielding glue is a prepolymer obtained through the polymerization reaction of the polyhydric alcohol, carbon dioxide gas generated by absorbing water is discharged in the use process of the glue, no organic solvent is added, no harmful gas is discharged, and the light-shielding glue is green and environment-friendly. As a result, the light-shading glue has the advantages of high shear strength, good weather resistance, extremely high light-shading effect, environmental friendliness and the like.

Detailed Description

The present invention will be further described with reference to the following examples.

The embodiment of the invention provides shading glue for a round hole of a camera, which is prepared from the following components in parts by mass: 15-40 parts of polytetrahydrofuran glycol, 10-15 parts of polypropylene glycol, 10-20 parts of poly adipic acid-1, 6 hexanediol ester glycol, 2-10 parts of carbon black, 10-20 parts of tackifying resin, 20-35 parts of 4, 4' -diphenylmethane diisocyanate, 0.02 part of catalyst and 0.1-2 parts of silane coupling agent.

According to different actual requirements, different component proportions can be selected to prepare the shading glue for the circular holes of the camera. Such as the component ratios of the different embodiments shown in the following table:

in addition to the component ratios of the different embodiments given in the table above, other component ratios may be selected as desired.

The components for preparing the shading glue can be selected according to different requirements as follows, wherein:

the molecular weight of polytetrahydrofuran glycol and polypropylene glycol can be selected from 2000, and the molecular weight of poly adipic acid-1, 6 hexanediol glycol can be selected from 3500.

The catalyst was dibutyltin dilaurate.

The tackifying resin is one or two of acrylic resin, carbon five petroleum resin or terpene phenolic resin.

The silane coupling agent is gamma-methacryloxypropyltrimethoxysilane or gamma-jade pendants on a crown propyltrimethoxysilane.

The carbon black can be one or more of MA100, MA8, and MA7 in Nissan Mitsubishi chemical industry.

Through the preferred proportion collocation of polyester polyol, polyether polyol and tackifying resin, because the rerum natura of material can have fabulous opening time, can be fine satisfies the demand of market, can cross-link after prepolymer (secondary mixture) and the moisture in the air reaction and form network structure and carry out the end capping through the silane coupling agent that adds to the prepolymer and modify that the colloid has fabulous adhesive force and high bulk strength to bonding substrate. The viscosity of the blind hole shading glue used in the current market, such as H4780ME of Hitachi, is up to 8000cp, 100 ℃. The glue disclosed by the invention has the advantages that the low viscosity is 4000cp, and the temperature is 100 ℃; the paint has certain thixotropy and short surface drying time; compared with the sample, the invention is more suitable for the current shading glue construction process, and is more suitable for the precise needle dispensing or glue spraying process. The addition of tackifying resin enables the colloid to have excellent repair performance, the existing shading glue is firm in bonding but insufficient in body strength, the repair and residual glue cleaning of a construction sample is extremely troublesome, and the production efficiency of a production line is greatly reduced; according to the preparation method, the added tackifying resin reacts with the prepolymer, so that the body strength of the colloid is increased, and the interface bonding force cannot be reduced.

The shading glue for electronic products is prepared according to the mixture ratio of the components in the embodiment shown in the table, and the preparation steps are as follows:

step 1: weighing the using amount of each component according to the proportion of the shading glue for the electronic product;

step 2: heating the polytetrahydrofuran glycol, the polypropylene glycol and the poly adipic acid-1, 6 hexanediol glycol to 120-140 ℃, fully dehydrating under the vacuum degree of less than 100pa, uniformly stirring, adding the carbon black and the tackifying resin, and dehydrating for half an hour to obtain a primary mixture;

and step 3: cooling the primary mixture to 85-95 ℃, adding the 4, 4' -diphenylmethane diisocyanate, and stirring for 70 minutes to obtain a secondary mixture, namely a prepolymer;

and 4, step 4: adding the catalyst and the silane coupling agent into the prepolymer, and continuing to react for half an hour;

and 5: and discharging, packaging, and placing in an oven at 80 ℃ for curing for 4 hours to obtain the shading glue for the electronic product.

Example 1

A preparation method of shading glue comprises the following steps:

(1) adding 15 parts of polytetrahydrofuran glycol, 15 parts of polypropylene glycol, 20 parts of poly adipic acid-1, 6 hexanediol glycol, 6 parts of carbon black and 15 parts of tackifying resin into a reaction kettle, uniformly stirring, heating to 120-140 ℃, and dehydrating for 2 hours under the condition that the vacuum degree is less than 100 Pa;

(2) cooling to 85-95 ℃, adding 26.98 parts of 4, 4' -diphenylmethane diisocyanate and 0.05 part of catalyst, and stirring to react for 2 hours at the temperature of 85-90 ℃ and under the vacuum degree of less than 100 Pa;

(3) adding 2 parts of silane coupling agent, and rapidly stirring for 30min under the condition that the vacuum degree is less than 100 Pa;

(4) and rapidly discharging under the protection of nitrogen and packaging to obtain the product.

The product sample prepared from example 1 is labeled a 1.

Example 2

A preparation method of shading glue comprises the following steps:

(1) adding 20 parts of polytetrahydrofuran glycol, 10 parts of polypropylene glycol, 25 parts of poly adipic acid-1, 6 hexanediol glycol, 6 parts of carbon black and 10 parts of tackifying resin into a reaction kettle, uniformly stirring, heating to 120-140 ℃, and dehydrating for 2 hours under the condition that the vacuum degree is less than 100 Pa;

(2) cooling to 85-95 ℃, adding 23 parts of 4, 4' -diphenylmethane diisocyanate and 0.05 part of catalyst, and stirring to react for 2 hours at the temperature of 85-90 ℃ and under the vacuum degree of less than 100 Pa;

(3) adding 1 part of silane coupling agent, and rapidly stirring for 30min under the condition that the vacuum degree is less than 100 Pa;

(4) and rapidly discharging under the protection of nitrogen and packaging to obtain the product.

The product sample prepared from example 1 is labeled a 2.

Example 3

A preparation method of shading glue comprises the following steps:

(1) adding 30 parts of polytetrahydrofuran glycol, 5 parts of polypropylene glycol, 10 parts of poly adipic acid-1, 6 hexanediol glycol, 6 parts of carbon black and 15 parts of tackifying resin into a reaction kettle, uniformly stirring, heating to 120-140 ℃, and dehydrating for 2 hours under the condition that the vacuum degree is less than 100 Pa;

(2) cooling to 85-95 ℃, adding 19 parts of 4, 4' -diphenylmethane diisocyanate and 0.05 part of catalyst, and stirring to react for 2 hours at the temperature of 85-90 ℃ and under the vacuum degree of less than 100 Pa;

(3) adding 1.5 parts of silane coupling agent, and rapidly stirring for 30min under the condition that the vacuum degree is less than 100 Pa;

(4) and rapidly discharging under the protection of nitrogen and packaging to obtain the product.

The product sample prepared from example 1 is labeled a 3.

Example 4

A preparation method of shading glue comprises the following steps:

(1) adding 5 parts of polytetrahydrofuran glycol, 25 parts of polypropylene glycol, 14 parts of poly adipic acid-1, 6 hexanediol ester glycol, 6 parts of carbon black and 20 parts of tackifying resin into a reaction kettle, uniformly stirring, heating to 120-140 ℃, and dehydrating for 2 hours under the condition that the vacuum degree is less than 100 Pa;

(2) cooling to 85-95 ℃, adding 16.8 parts of 4, 4' -diphenylmethane diisocyanate and 0.05 part of catalyst, and stirring to react for 2 hours at the temperature of 85-90 ℃ and under the vacuum degree of less than 100 Pa;

(3) adding 0.8 part of silane coupling agent, and rapidly stirring for 30min under the condition that the vacuum degree is less than 100 Pa;

(4) and rapidly discharging under the protection of nitrogen and packaging to obtain the product.

The product sample prepared from example 1 is labeled a 4.

Example 5

A preparation method of shading glue comprises the following steps:

(1) adding 25 parts of polytetrahydrofuran glycol, 5 parts of polypropylene glycol, 25 parts of poly adipic acid-1, 6 hexanediol glycol, 6 parts of carbon black and 10 parts of tackifying resin into a reaction kettle, uniformly stirring, heating to 120-140 ℃, and dehydrating for 2 hours under the condition that the vacuum degree is less than 100 Pa;

(2) cooling to 85-95 ℃, adding 23 parts of 4, 4' -diphenylmethane diisocyanate and 0.05 part of catalyst, and stirring to react for 2 hours at the temperature of 85-90 ℃ and under the vacuum degree of less than 100 Pa;

(3) adding 2.5 parts of silane coupling agent, and rapidly stirring for 30min under the condition that the vacuum degree is less than 100 Pa;

(4) and rapidly discharging under the protection of nitrogen and packaging to obtain the product.

The product sample prepared from example 1 is labeled a 5.

The samples A1-A5 are heated to 100 ℃ for about 15min, the blind hole dispensing is carried out by a professional dispenser, the samples are amplified and exposed, and the images are displayed by an electron microscope to be observed and evaluated on a computer. The experimental result shows that A2, two experiment materials of A5 surface dry soon, are fit for being used for the blind hole point and glue to through the interpolation of carbon black, the shading effect is also fabulous, satisfies the demand completely.

And (3) overlapping the samples to obtain PC test pieces, wherein the strength of the completely cured samples reaches over 7 MPa, placing the overlapped sample plates in a high-temperature high-humidity test box and a cold-heat impact test box, and taking out the sample plates after placing for 168 hours. (the high temperature and high humidity is carried out at 85 percent of humidity and 85 ℃, and the cold and hot impact is-40 ℃ to 80 ℃) is placed for 3 hours and then tested, the strength of the high temperature and high humidity sample piece is attenuated by half, and the cold and hot impact strength is attenuated by 30 percent, thereby meeting the market demand.

The above-mentioned embodiments are mainly intended to illustrate the inventive concept, and it should be noted that those skilled in the art may make various changes and modifications without departing from the inventive concept, and all such changes and modifications are within the scope of the present invention.

Claims (7)

1. The shading glue is characterized by being prepared from the following components in parts by mass:

15-40 parts of polytetrahydrofuran glycol, 10-15 parts of polypropylene glycol, 10-20 parts of poly adipic acid-1, 6 hexanediol ester glycol, 2-10 parts of carbon black, 10-20 parts of tackifying resin, 20-35 parts of 4, 4' -diphenylmethane diisocyanate, 0.02 part of catalyst and 0.1-3 parts of silane coupling agent.

2. The light-shielding glue of claim 1, wherein the molecular weights of the polytetrahydrofuran diol and the polypropylene glycol are both 2000, and the molecular weight of the poly 1, 6 hexanediol adipate diol is 3500.

3. A light-blocking glue according to claim 1, characterised in that the catalyst is dibutyltin dilaurate.

4. The light-shielding glue of claim 1, wherein the tackifying resin is one or two of acrylic resin, carbon five petroleum resin or terpene phenolic resin.

5. The light-shielding glue of claim 1, wherein the silane coupling agent is gamma-methacryloxypropyltrimethoxysilane or gamma-jade pendants on a crown propyltrimethoxysilane.

6. The light-shielding glue of claim 1, wherein the carbon black is one or two of MA100, MA8 and MA7 in Mitsubishi chemical industry.

7. A method for preparing the light-shielding glue water as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps:

step 1: weighing the using amount of each component according to the proportion of the shading glue for the electronic product;

step 2: heating the polytetrahydrofuran glycol, the polypropylene glycol and the poly adipic acid-1, 6 hexanediol glycol to 120-140 ℃, fully dehydrating under the vacuum degree of less than 100pa, uniformly stirring, adding the carbon black and the tackifying resin, and dehydrating for half an hour to obtain a primary mixture;

and step 3: cooling the primary mixture to 85-95 ℃, adding the 4, 4' -diphenylmethane diisocyanate, and stirring for 70 minutes to obtain a secondary mixture;

and 4, step 4: adding the catalyst and the silane coupling agent into the secondary mixture, and continuing to react for half an hour;

and 5: and discharging, packaging, and placing in an oven at 80 ℃ for curing for 4 hours to obtain the shading glue for the electronic product.