阅读说明：本技术 浸涂型化铣保护胶 (Dip-coating type chemical milling protective adhesive ) 是由 李清材 于建龙 郑翔翔 滕志春 徐生亮 李金虎 于 2020-12-07 设计创作，主要内容包括：本发明在主体基料树脂中引入自制热塑性丙烯酸树脂,提高与基材的附着力,再加入具有良好初粘力的氢化碳氢石油树脂,使其具有附着力热高冷低的性能,在具有良好刻型性基础上达到附着力与可剥性平衡,采用全四氯乙烯溶剂体系,阻止填料的下沉,加入适量的防结皮剂延长涂料在敞口使用时的结皮时间,利用浸涂的施工方式解决粉尘污染严重、安全性较差等问题,保证化学铣切的浸蚀比,以满足在化铣工艺中的使用要求。(The invention introduces self-made thermoplastic acrylic resin into main base resin to improve the adhesive force with base material, then adds hydrogenated hydrocarbon petroleum resin with good initial adhesive force to make it have the properties of high and low adhesive force, and can reach the balance of adhesive force and strippability on the basis of good engraving property, adopts the all-tetrachloroethylene solvent system to prevent filler from sinking, adds a proper amount of anti-skinning agent to prolong the skinning time of the coating when the coating is used in an open place, and utilizes the construction mode of dip coating to solve the problems of serious dust pollution, poor safety and the like, and ensures the etching ratio of chemical milling to meet the use requirements in the chemical milling process.)

1. The dip-coating type chemical milling protective adhesive is characterized by comprising the following components in percentage by mass:

2. the dip-coating chemical milling protective adhesive according to claim 1, wherein the main body base resin is one or more of SEBS, SBS and SIS resin, and the molecular weight is 100000-120000.

3. The dip-coating type chemical milling protective adhesive according to claim 1, wherein the hydrogenated hydrocarbon petroleum resin is hydrogenated hydrocarbon pentapetroleum resin and has a molecular weight of 300-3000.

4. The dip-coated chemical milling protective paste according to claim 1, wherein the solvent is tetrachloroethylene.

5. The dip-coating type chemical milling protective adhesive according to claim 1, wherein the pigment is one or more of lemon yellow, phthalocyanine green, titanium white, medium chrome yellow and light chrome yellow, and the filler is one or more of talcum powder, kaolin and silicon dioxide.

6. The dip-coating type chemical milling protective adhesive according to claim 1, wherein the auxiliary agent is one or more of a wetting dispersant, a defoaming agent, a surface auxiliary agent and an anti-skinning agent.

7. The dip-coated chemical milling protective adhesive according to claim 1, wherein the thermoplastic acrylic resin comprises the following components in percentage by mass:

42-55% of isobornyl methacrylate

2 to 6 percent of initiator

41-56% of dimethylbenzene.

8. The dip-coating chemical milling protective paste according to claim 7, wherein the initiator is one or more of dibenzoyl peroxide (BPO), azobisisoheptylbutyronitrile and dimethyl azobisisobutyrate.

9. The dip-coating type chemical milling protective adhesive according to claim 7, wherein the preparation process of the thermoplastic acrylic resin comprises the steps of adding part of xylene into a reactor, starting stirring and heating to reflux, dissolving part of an initiator by using part of xylene, adding isobornyl methacrylate, and uniformly mixing to obtain a component I; dropping the component I into a reactor at a constant speed by using a dropping funnel, preserving the temperature for 1 hour after dropping within 3 hours, and dissolving part of an initiator by using part of dimethylbenzene to serve as a component II; dropping the component II into the reactor at a constant speed by using a dropping funnel, preserving the temperature for one hour after the dropping is finished within half an hour, and dissolving the rest initiator by using the rest dimethylbenzene to be used as a component III; and (3) dropping the component III into the reactor at a constant speed by using a dropping funnel, keeping the temperature for one hour after the dropping is finished within half an hour, cooling and discharging, wherein the solid content is 42-54%, and the viscosity is 16-31 s.

10. The preparation process of the dip-coating chemical milling protective glue according to any one of claims 1 to 9 comprises the following steps: dissolving the main base resin and the hydrogenated hydrocarbon petroleum resin by using a part of solvent, adding the thermoplastic acrylic resin after completely dissolving, sequentially adding the pigment, the filler and the auxiliary agent under stirring, uniformly stirring by using a high-speed stirrer, grinding and dispersing by using a sand mill until the fineness is less than or equal to 30 mu m, adjusting the solid content and the viscosity by using the residual solvent, filtering and packaging after the adjustment to obtain a finished product.

Technical Field

The invention belongs to the technical field of chemical milling protective adhesives, and particularly relates to a dip-coating type chemical milling protective adhesive with good safety and peelability and a preparation method thereof.

Background

The chemical milling protective glue is an indispensable important material in the chemical milling process, plays a temporary protection role in the chemical milling process, is used for protecting a non-processing surface from being corroded by etching liquid, and ensures that a processing part meets the requirements of design and tolerance matching precision. The chemical milling agent has excellent chemical corrosion resistance, can be well matched with a base material to be chemically milled, a film forming material is easy to strip off in a whole piece after the chemical milling process is finished, and the stripped surface can be subjected to subsequent surface treatment and other processes without special treatment.

At present, most of domestic chemical milling protective glue adopts a spraying or brushing construction mode, the coating loss is serious, the labor intensity is too high, the dust pollution in the air is great in the construction process, the solvent volatilization causes serious pollution to the environment, and the safety is poor. The dip-coating type chemical milling protective adhesive is of a completely tetrachloroethylene type, adopts a dip-coating construction mode, has the advantages of convenience in operation, small coating loss, no dust pollution, high safety and the like, can meet the molding requirements of parts with complex structures and thin walls, plays a role in temporary protection in the chemical milling process, can be well matched with a substrate to be chemically milled, and can be used for easily stripping a film-forming material in a whole piece after the chemical milling process is finished, and the stripped surface can be subjected to subsequent processes such as surface treatment without special treatment.

Disclosure of Invention

The invention aims to provide the dip-coating type chemical milling protective adhesive which is non-flammable, good in compactness, balanced in adhesive force and strippability, capable of greatly prolonging the skinning time of a coating in open use, free of substrate corrosion leakage in the chemical milling process, capable of ensuring that the corrosion ratio meets the standard requirement of the chemical milling process, and good in strippability after the chemical milling process is finished.

The dip-coating chemical milling raw material comprises the following components in percentage by mass:

preferably, the main body base resin is one or more of SEBS, SBS and SIS resin, and the molecular weight is 100000-120000.

Preferably, the hydrogenated hydrocarbon petroleum resin is hydrogenated hydrocarbon petroleum resin with the molecular weight of 300-3000.

Preferably, the solvent is tetrachloroethylene.

Preferably, the pigment is one or more of lemon yellow, phthalocyanine green, titanium dioxide, medium chrome yellow, light chrome yellow and the like.

Preferably, the filler is one or more of talcum powder, kaolin, silicon dioxide and the like.

More preferably, at least one of the fillers is silica.

Preferably, the auxiliary agent is one or a mixture of a plurality of wetting dispersant, a defoaming agent, a surface auxiliary agent and an anti-skinning agent.

More preferably, the auxiliaries are used simultaneously as several of those listed.

More preferably, the wetting dispersant is BYK-2008, the defoaming agent is BYK-085, the surface additive is BYK-333, and the anti-skinning agent is KL-841.

The preparation process of the dip-coating type chemical milling protective adhesive comprises the following steps:

dissolving main base resin and hydrogenated hydrocarbon petroleum resin with a part of solvent, adding self-made thermoplastic acrylic resin after completely dissolving, sequentially adding pigment, filler and auxiliary agent under stirring, uniformly stirring the raw materials by a high-speed stirrer, grinding and dispersing the raw materials by a sand mill until the fineness is less than or equal to 30 mu m, adjusting the solid content and the viscosity by the residual solvent, filtering and packaging after adjustment to obtain a finished product.

Preferably, the thermoplastic acrylic resin is self-made.

Wherein the self-made thermoplastic acrylic resin comprises the following components in percentage by mass:

42-55% of isobornyl methacrylate

2 to 6 percent of initiator

41-56% of dimethylbenzene

Preferably, the initiator is one or more of BPO (dibenzoyl peroxide), azobisisoheptonitrile and dimethyl azobisisobutyrate.

The preparation process of the self-made thermoplastic acrylic resin comprises the following steps: a portion of the xylene was added to the reactor and stirring was started and the temperature was raised to reflux. Dissolving a part of initiator by using a part of xylene, adding isobornyl methacrylate, and uniformly mixing to obtain a component I; dropping the component I into the reactor at a constant speed by using a dropping funnel, and keeping the temperature for 1 hour after the dropping is finished within 3 hours; dissolving part of the initiator by using part of xylene as a component II; dropping the component II into the reactor at a constant speed by using a dropping funnel, and keeping the temperature for one hour after the dropping is finished within half an hour; dissolving part of the initiator by using part of xylene as a component III; and (3) dropping the component III into the reactor at a constant speed by using a dropping funnel, and keeping the temperature for one hour after the dropping is finished within half an hour.

And (3) cooling and discharging, wherein the solid content is 42-54%, and the viscosity is 16-31 s.

The invention has the following effects: the invention introduces self-made thermoplastic acrylic resin into main base resin to improve the adhesive force with base material, then adds hydrogenated hydrocarbon petroleum resin with good initial adhesive force to make it have the properties of high and low adhesive force, and can reach the balance of adhesive force and strippability on the basis of good engraving property, adopts the all-tetrachloroethylene solvent system to prevent filler from sinking, adds a proper amount of anti-skinning agent to prolong the skinning time of the coating when the coating is used in an open place, and utilizes the construction mode of dip coating to solve the problems of serious dust pollution, poor safety and the like, and ensures the etching ratio of chemical milling to meet the use requirements in the chemical milling process.

Detailed Description

This example demonstrates the preparation of dip-coated chemical milling protective glue.

The first embodiment is as follows:

1. synthetic thermoplastic acrylic resin

60g of xylene is added into a three-neck flask with a stirring device, a thermometer and a dropping funnel, heated to 130-140 ℃ for reflux, and the temperature is kept unchanged.

4.5g of BPO was completely dissolved in 20g of xylene, and then 100g of isobornyl methacrylate was added thereto, followed by stirring. And pouring the mixture into a dropping funnel, dropping into a three-neck flask at a constant speed, and controlling the dropping to be finished within three hours. The temperature was maintained for one hour.

0.25g of BPO was completely dissolved in 10g of xylene. And pouring the mixture into a dropping funnel, dropping into a three-neck flask at a constant speed, and controlling the dropping to be finished within half an hour. The temperature was maintained for one hour.

0.25g of BPO was completely dissolved in 10g of xylene. And pouring the mixture into a dropping funnel, dropping into a three-neck flask at a constant speed, and controlling the dropping to be finished within half an hour. The temperature was maintained for one hour.

Cooling, filtering, discharging, and measuring solid content and viscosity.

2. Preparation of dip-coating type chemical milling protective adhesive

Weighing 11g of SEBS resin and 6g of hydrogenated carbon penta-petroleum resin, adding 1.6g of prepared acrylic resin, adding 60g of tetrachloroethylene to completely dissolve the acrylic resin, adding 0.02g of lemon yellow, 4.7g of talcum powder, 5.8g of silicon dioxide, 0.4g of BYK-2008, 0.3g of BYK-085, 0.3g of BYK-333, 0.6gKL-841 and 34g of tetrachloroethylene, uniformly mixing, grinding and dispersing by a grinding and dispersing machine until the fineness is less than 30 micrometers, and preparing the dip-coating chemical milling protective adhesive.

And coating the prepared dip-coating type chemical milling protective adhesive on a 2A12-T4 aluminum plate needing chemical milling, and performing a performance test after drying for 18 h.

The test performance results are as follows:

example two:

1. synthetic thermoplastic acrylic resin

50g of xylene is added into a three-neck flask with a stirrer, a thermometer and a dropping funnel, heated to 130-140 ℃ for reflux, and the temperature is kept unchanged.

5.5g of BPO was completely dissolved in 20g of xylene, and 110g of isobornyl methacrylate was added thereto and the mixture was stirred uniformly. And pouring the mixture into a dropping funnel, dropping into a three-neck flask at a constant speed, and controlling the dropping to be finished within three hours. The temperature was maintained for one hour.

3g of BPO was completely dissolved in 10g of xylene. And pouring the mixture into a dropping funnel, dropping into a three-neck flask at a constant speed, and controlling the dropping to be finished within half an hour. The temperature was maintained for one hour.

2.5g of BPO was completely dissolved in 10g of xylene. And pouring the mixture into a dropping funnel, dropping into a three-neck flask at a constant speed, and controlling the dropping to be finished within half an hour. The temperature was maintained for one hour.

Cooling, filtering, discharging, and measuring solid content and viscosity.

2. Preparation of dip-coating type chemical milling protective adhesive

Weighing 12g of SEBS resin and 5.5g of hydrogenated carbon penta petroleum resin, adding 1.9g of prepared acrylic resin, adding 71g of tetrachloroethylene to completely dissolve the acrylic resin, adding 0.02g of lemon yellow, 4.4g of talcum powder, 6.6g of silicon dioxide, 0.5g of BYK-2008, 0.4g of BYK-085, 0.4g of BYK-333, 0.7g of 0.7gKL-841 and 40g of tetrachloroethylene, uniformly mixing, grinding and dispersing by a grinding and dispersing machine until the fineness is less than 30 micrometers, and preparing the dip-coating type chemical milling protective adhesive.

And coating the prepared dip-coating type chemical milling protective adhesive on a 2A12-T4 aluminum plate needing chemical milling, and performing a performance test after drying for 18 h.

The test performance results are as follows:

the present disclosure has been described in terms of the above-described embodiments, which are merely exemplary of the implementations of the present disclosure. It must be noted that the disclosed embodiments do not limit the scope of the disclosure. Rather, variations and modifications are possible within the spirit and scope of the disclosure, and these are all within the scope of the disclosure.