CN113717476A - Novel environment-friendly polymer shielding material and preparation method thereof - Google Patents
Novel environment-friendly polymer shielding material and preparation method thereof Download PDFInfo
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- CN113717476A CN113717476A CN202111159803.8A CN202111159803A CN113717476A CN 113717476 A CN113717476 A CN 113717476A CN 202111159803 A CN202111159803 A CN 202111159803A CN 113717476 A CN113717476 A CN 113717476A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
- C08L25/10—Copolymers of styrene with conjugated dienes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Chemical Kinetics & Catalysis (AREA)
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- Adhesives Or Adhesive Processes (AREA)
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Abstract
The invention discloses a novel environment-friendly high-molecular shielding material and a preparation method thereof, wherein the novel environment-friendly high-molecular shielding material comprises a softening agent, a main polymer, tackifying resin and an additive; the component proportion of the softener is 20-50%; the component proportion of the main polymer is 20-40%; the component proportion of the tackifying resin is 10-30%; the component proportion of the additive is 1-10%; the high heat-resistant effect is achieved by improving the proportion of the main polymer and the heat-resistant resin component, so that the heat-resistant requirement during vacuum coating processing is met; the peeling strength is controlled to be 30-80N/Psi by adjusting the proportion of each material, so that the protective effect is effectively achieved during vacuum coating, and the loss caused by residual glue or tensile deformation of the coated material is avoided; by adding the tackifying resin and controlling the component ratio, the melt viscosity of the material at 180 ℃ is 1000-10000mPa & s, so that the viscosity of the material cannot be blocked due to too high viscosity.
Description
Technical Field
The invention relates to the technical field of circuit board shielding, in particular to a novel environment-friendly high polymer shielding material and a preparation method thereof.
Background
Conventionally, when an electronic component is vacuum-coated, it is necessary to shield a fragile portion, a portion which does not need to be processed, or the like with a shielding material. The portion to be protected is mostly irregular, and the surface is more uneven, so that a shielding material capable of being well attached to the irregular local oil is required. Known shielding technology that has adopted now is customization tool + sticky tape complex mode, and this method is higher to the design requirement of tool, and the part that needs to shield is the dysmorphism mostly, and the tool is mostly the metal material, and the shape that designs completely to shield is higher to the requirement of tool production, so the mode that has adopted tool + shielding sticky tape to go on mostly now. The flexibility of the masking tape is utilized to cooperatively supplement parts which cannot be masked by the jig, but some special structures and fragile parts which need protection cannot be perfectly solved by the scheme. Except the matching mode of the jig and the adhesive tape, the protective adhesive tape also utilizes silica gel materials as protection, the silica gel materials are diluted by a solvent and achieve the protective performance by volatilizing the solvent and absorbing water and solidifying by the silica gel materials, so organic solvents (toluene, xylene or acetone and the like) are needed to be used, and the organic solvents have great harm to human bodies. In addition, the volatilization and solidification time is long, and the production efficiency is low. The removal requires a lot of labor and the residue of organic substances limits the application of the organic substances in high-end occasions, especially the current environmental requirements are increased, and benzene, aldehyde and the like can not be detected.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a novel environment-friendly high-molecular shielding material and a preparation method thereof, and the shielding material which is nontoxic, environment-friendly, easy to coat, strong in special-shaped shielding capacity, simple to remove, efficient and free of residual effect can be prepared.
The technical scheme is as follows: in order to achieve the purpose, the novel environment-friendly high polymer shielding material comprises a softening agent, a main polymer, tackifying resin and an additive; the component proportion of the softener is 20-50%; the component proportion of the main polymer is 20-40%; the component proportion of the tackifying resin is 10-30%; the proportion of the components of the additive is 1-10%.
Further, the softening agent includes paraffin oil, naphthenic oil, low molecular polyisobutylene, and a plasticizer (DOP).
Further, the main polymer includes styrene butadiene random copolymer (SBR), styrene butadiene block copolymer (SBS), and styrene ethyl butadiene copolymer (SEBS).
Further, the tackifying resins include hydrogenated C5 petroleum resins, hydrogenated C9 petroleum resins, and hydrogenated rosin resins.
Further, the additives include antioxidant 1010, antioxidant 168, antioxidant 1076, fluorescer OB, antioxidant DTLP, antioxidant 412S.
Further, a preparation method of the novel environment-friendly polymer shielding material comprises the following steps,
step one, adding a softening agent and an additive into a stirring kettle, setting the heating temperature of the stirring kettle at 160 ℃ and 190 ℃, and then waiting for the temperature to rise;
step two, when the temperature in the stirring kettle rises to 110-130 ℃, starting a stirring device of the stirring kettle, keeping the rotating speed at 30-40Hz, then adding the main polymer for multiple times, and simultaneously ensuring that the inner wall of the stirring kettle does not have uneven conditions such as agglomeration and the like; after the main polymer is completely put into the stirring kettle, continuously heating and stirring the stirring kettle, vacuumizing the stirring kettle to keep the vacuum degree in the stirring kettle above-0.09 MPa, and then keeping for 1-2 hours;
step three, after confirming that the materials in the stirring kettle are completely melted, adding the tackifying resin into the stirring kettle, and then continuously heating and stirring the stirring kettle and keeping the vacuum degree to be more than-0.09 MPa;
step four, after 0.5-1 hour, confirming the melting state of the material in the stirring kettle, if the melting is completed, finishing the production, otherwise, continuing to work until the material is completely melted;
and step five, processing the melted liquid material into a material block with a proper size through a cooling forming process.
Has the advantages that: the novel environment-friendly high polymer shielding material and the preparation method thereof can prepare the shielding material which has the advantages of no toxicity, environmental protection, easy coating, strong special-shaped shielding capability, simple removal, high efficiency and no residual effect, and comprises the following technical effects:
1) the high heat-resistant effect is achieved by improving the proportion of the main polymer and the heat-resistant resin component, so that the heat-resistant requirement during vacuum coating processing is met;
2) the peeling strength is controlled to be 30-80N/Psi by adjusting the proportion of each material, so that the protective effect is effectively achieved during vacuum coating, and the loss caused by residual glue or tensile deformation of the coated material is avoided;
3) by adding the tackifying resin and controlling the component ratio, the melt viscosity of the material at 180 ℃ is 1000-10000mPa & s, so that the viscosity of the material cannot be blocked due to too high viscosity.
Detailed Description
A novel environment-friendly high-molecular shielding material comprises a softening agent, a main polymer, tackifying resin and an additive; the component proportion of the softener is 20-50%; the component proportion of the main polymer is 20-40%; the component proportion of the tackifying resin is 10-30%; the component proportion of the additive is 1-10%; the material does not need a solvent, has good environmental protection, shields and protects key parts or parts which do not need to be coated by matching a simple jig and a small amount of adhesive tapes in a vacuum coating process, and can be separated efficiently without residue after coating is finished. The material solves the problems that in the prior art, the design of a jig is complex, the masking tape is high in viscosity, so that the board is easy to stretch and deform when being stripped and removed, and the environment-friendly problem that the strippable paint solvent type masking material brings organic solvent residue is also avoided.
The softening point of the material is 100-140 ℃, the vacuum coating needs to be operated at the temperature of 60 ℃ and the vacuum degree reaches-0.08 MPa, and the shielding material has higher heat-resistant requirement, so that the weaker peeling strength can not play a role in protection when the vacuum coating is performed, and the stronger peeling strength is easy to cause the loss of residual glue or the material subjected to the coating by pulling deformation when the material is removed at the later stage, so that the peeling strength is controlled within 30-80N/Psi by adjusting the proportion of each material, and the peeling strength of the material is controlled within a more balanced range; the excessively low tensile strength of the shielding material represents insufficient cohesive force, the shielding material is broken when peeled off at the later stage to cause residual glue, and the cleaning, high efficiency and residue-free removal cannot be realized, so that the proper tensile strength of the high-molecular shielding material is ensured by adjusting the proportion of the main polymer, and the tensile strength is more than 3N/mm2。
The softener includes paraffin oil, naphthenic oil, low molecular polyisobutylene, and plasticizer (DOP).
The main polymers include styrene butadiene random copolymer (SBR), styrene butadiene block copolymer (SBS) and styrene ethyl butadiene copolymer (SEBS).
The tackifying resins include hydrogenated C5 petroleum resins, hydrogenated C9 petroleum resins, and hydrogenated rosin resins; the viscosity of the material is set to 1000-10000 mPa.s at 180 ℃ by adding the tackifying resin, so that the viscosity of the material is not too high, and the adhesion is caused.
The additives include antioxidant 1010, antioxidant 168, antioxidant 1076, fluorescer OB, antioxidant DTLP, antioxidant 412S.
A preparation method of a novel environment-friendly polymer shielding material comprises the following steps,
step one, adding a softening agent and an additive into a stirring kettle, setting the heating temperature of the stirring kettle at 160 ℃ and 190 ℃, and then waiting for the temperature to rise;
step two, when the temperature in the stirring kettle rises to 110-130 ℃, starting a stirring device of the stirring kettle, keeping the rotating speed at 30-40Hz, then adding the main polymer for multiple times, and simultaneously ensuring that the inner wall of the stirring kettle does not have uneven conditions such as agglomeration and the like; after the main polymer is completely put into the stirring kettle, continuously heating and stirring the stirring kettle, vacuumizing the stirring kettle to keep the vacuum degree in the stirring kettle above-0.09 MPa, and then keeping for 1-2 hours;
step three, after confirming that the materials in the stirring kettle are completely melted, adding the tackifying resin into the stirring kettle, and then continuously heating and stirring the stirring kettle and keeping the vacuum degree to be more than-0.09 MPa;
step four, after 0.5-1 hour, confirming the melting state of the material in the stirring kettle, if the melting is completed, finishing the production, otherwise, continuing to work until the material is completely melted;
and step five, processing the melted liquid material into a material block with a proper size through a cooling forming process.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. A novel environment-friendly polymer shielding material is characterized in that: comprises a softening agent, a main polymer, a tackifying resin and an additive; the component proportion of the softener is 20-50%; the component proportion of the main polymer is 20-40%; the component proportion of the tackifying resin is 10-30%; the proportion of the components of the additive is 1-10%.
2. The novel environment-friendly polymer shielding material as claimed in claim 1, wherein: the softener includes paraffin oil, naphthenic oil, low molecular polyisobutylene, and plasticizer (DOP).
3. The novel environment-friendly polymer shielding material as claimed in claim 1, wherein: the main polymers include styrene butadiene random copolymer (SBR), styrene butadiene block copolymer (SBS) and styrene ethyl butadiene copolymer (SEBS).
4. The novel environment-friendly polymer shielding material as claimed in claim 1, wherein: the tackifying resins include hydrogenated C5 petroleum resins, hydrogenated C9 petroleum resins, and hydrogenated rosin resins.
5. The novel environment-friendly polymer shielding material as claimed in claim 1, wherein: the additives include antioxidant 1010, antioxidant 168, antioxidant 1076, fluorescer OB, antioxidant DTLP, antioxidant 412S.
6. The method for preparing a novel environment-friendly polymer shielding material according to claim 1, wherein the method comprises the following steps: comprises the following steps of (a) carrying out,
step one, adding a softening agent and an additive into a stirring kettle, setting the heating temperature of the stirring kettle at 160 ℃ and 190 ℃, and then waiting for the temperature to rise;
step two, when the temperature in the stirring kettle rises to 110-130 ℃, starting a stirring device of the stirring kettle, keeping the rotating speed at 30-40Hz, then adding the main polymer for multiple times, and simultaneously ensuring that the inner wall of the stirring kettle does not have uneven conditions such as agglomeration and the like; after the main polymer is completely put into the stirring kettle, continuously heating and stirring the stirring kettle, vacuumizing the stirring kettle to keep the vacuum degree in the stirring kettle above-0.09 MPa, and then keeping for 1-2 hours;
step three, after confirming that the materials in the stirring kettle are completely melted, adding the tackifying resin into the stirring kettle, and then continuously heating and stirring the stirring kettle and keeping the vacuum degree to be more than-0.09 MPa;
step four, after 0.5-1 hour, confirming the melting state of the material in the stirring kettle, if the melting is completed, finishing the production, otherwise, continuing to work until the material is completely melted;
and step five, processing the melted liquid material into a material block with a proper size through a cooling forming process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111159803.8A CN113717476A (en) | 2021-09-30 | 2021-09-30 | Novel environment-friendly polymer shielding material and preparation method thereof |
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| CN202111159803.8A CN113717476A (en) | 2021-09-30 | 2021-09-30 | Novel environment-friendly polymer shielding material and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012021103A (en) * | 2010-07-16 | 2012-02-02 | Toyo Adl Corp | Resin composition, and laminate and image-formed material using the same |
| JP2013194108A (en) * | 2012-03-19 | 2013-09-30 | Toyo Ink Sc Holdings Co Ltd | Pressure-sensitive adhesive and laminate |
| CN104943300A (en) * | 2015-05-19 | 2015-09-30 | 北京宇阳泽丽防水材料有限责任公司 | Direct buried type macromolecular pre-laid waterproof coiled material and preparation method thereof |
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2021
- 2021-09-30 CN CN202111159803.8A patent/CN113717476A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012021103A (en) * | 2010-07-16 | 2012-02-02 | Toyo Adl Corp | Resin composition, and laminate and image-formed material using the same |
| JP2013194108A (en) * | 2012-03-19 | 2013-09-30 | Toyo Ink Sc Holdings Co Ltd | Pressure-sensitive adhesive and laminate |
| CN104943300A (en) * | 2015-05-19 | 2015-09-30 | 北京宇阳泽丽防水材料有限责任公司 | Direct buried type macromolecular pre-laid waterproof coiled material and preparation method thereof |
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