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CN-122011832-A - Modified solvent printing ink for PVC mask brushing and preparation method thereof

CN122011832ACN 122011832 ACN122011832 ACN 122011832ACN-122011832-A

Abstract

The invention discloses modified solvent type ink for PVC mask brushing and a preparation method thereof, belongs to the technical field of polymer ink production, and aims at solving the problems of post-sticking and falling caused by plasticizer migration in soft PVC mask brushing, ink layer embrittlement caused by traditional anti-sticking, poor stain resistance, water whitening resistance and the like. The printing ink consists of vinyl chloride-vinyl acetate resin main resin liquid, double-modified synergistic prepolymer, pigment, anti-settling agent, dispersing agent and mixed solvent, wherein the prepolymer is prepared by reacting dimeric alcohol with hydroxyl-terminated PDMS and IPDI and blocking with MEKO. The high anti-blocking and high stain resistance are realized through the gradient structure of the internal soft segment compatible buffer plasticizer and the surface silicon segment low surface energy barrier, and meanwhile, the flexibility, the adhesive force and the recoating property are maintained.

Inventors

  • ZHUANG QIMING
  • ZHUANG QIFEI

Assignees

  • 黄山豪泰塑胶有限公司

Dates

Publication Date
20260512
Application Date
20260324

Claims (9)

  1. 1. The modified solvent type printing ink for the PVC mask painting is characterized by comprising the following raw materials in parts by weight: 45-55 parts of main resin liquid; 12-18 parts of double-modified synergistic prepolymer; 20-30 parts of pigment; 0.2-0.5 part of anti-settling agent; 0.5-2.0 parts of dispersing agent; 10-20 parts of mixed solvent.
  2. 2. The modified solvent-based ink for coating a PVC mask according to claim 1, wherein the main resin liquid is a binary vinyl chloride-ethyl acetate solution having a solid content of 30%.
  3. 3. The modified solvent-based ink for coating a PVC mask according to claim 1, wherein the pigment is titanium pigment.
  4. 4. The modified solvent-based ink for coating a PVC mask according to claim 1, wherein the anti-settling agent is organobentonite or fumed silica.
  5. 5. The modified solvent-based ink for coating a PVC mask according to claim 1, wherein the dispersant is BYK-163 or BYK-110.
  6. 6. The modified solvent type ink for coating a PVC mask according to claim 1, wherein the mixed solvent is butanone and butyl acetate according to a volume ratio of 6:4.
  7. 7. The modified solvent-based ink for coating a PVC mask according to claim 1, wherein the dual modified co-prepolymer is prepared by the steps of: Step A1, mixing dimeric alcohol and hydroxyl-terminated polydimethylsiloxane, and dehydrating for 1.5-2.0 h under the vacuum condition of 105-110 ℃ and minus 0.098MPa to obtain a mixture; step A2, cooling the mixture to 55-60 ℃, adding isophorone diisocyanate into the mixture, adding bismuth neodecanoate into the system after the completion of the reaction, heating the system to 80-85 ℃ for reaction for 3-5 hours, and obtaining a copolymer after the completion of the reaction; Step A3, cooling the copolymer to 45-50 ℃, dropwise adding methyl ethyl ketone oxime into the copolymer, and after the completion of the reaction, preserving heat until a-NCO characteristic peak at a position of -1 cm in an infrared spectrum disappears, thereby obtaining a product; And A4, adding ethyl acetate into the product to adjust the solid content to 50% -60%, and obtaining the double-modified synergistic prepolymer after finishing.
  8. 8. The modified solvent type ink for coating a PVC mask according to claim 7, wherein the dosage ratio of the dimer alcohol to the hydroxyl-terminated polydimethylsiloxane to the isophorone diisocyanate to the bismuth neodecanoate to the methyl ethyl ketone oxime is 80g:20 g:50-55 g:4-5 g:22-25 g.
  9. 9. The method for preparing the modified solvent-based ink for brushing a PVC mask according to any one of claims 1 to 8, which is characterized by comprising the following steps: step S1, weighing raw materials according to parts by weight, mixing and stirring main resin liquid, dispersing agent and pigment accounting for 40% of the total weight for 15-30 min to obtain color paste; Step S2, adding the double-modified synergistic prepolymer into the rest main resin liquid at the stirring speed of 800-1000 rpm, and mixing and stirring for 15-30 min to obtain a mixed component; Step S3, adding the color paste prepared in the step S1, the anti-settling agent and the mixed solvent into the mixed components, and mixing and stirring for 5-10 min to obtain a crude product; And S4, grinding the crude product, and filtering the ground product by a 300-mesh filter screen to obtain the modified solvent type printing ink for painting the finished PVC mask.

Description

Modified solvent printing ink for PVC mask brushing and preparation method thereof Technical Field The invention belongs to the technical field of high polymer ink production, and particularly relates to modified solvent-based ink for PVC mask brushing and a preparation method thereof. Background Soft polyvinyl chloride (PVC) is widely used for producing specific face masks, model heads, inflatable toys and the like due to its soft touch and high degree of simulation. In order to impart realistic skin tone and texture to a product, it is necessary to carry out an ink finish on its surface. However, existing solvent-based PVC inks (typically based on a vinyl chloride-vinyl acetate system) have the following serious technical drawbacks in practical applications: (1) The soft PVC contains up to 30% -50% of plasticizer (such as DOP and DINP). Plasticizers migrate to the ink layer during high temperature or long term storage, causing swelling, tackiness (poor Anti-blocking properties) of the ink resin, and in severe cases, causing the stacked products to adhere to each other and become scrapped. (2) Contradiction of mechanical properties in order to prevent sticking, it is conventional practice to increase the hardness of the resin (e.g., increase the proportion of vinyl chloride) or to add a large amount of wax powder. However, this causes the ink layer to become brittle, and cracks appear in the ink layer when the mask is bent or stretched at a large angle, while the addition of excessive wax powder causes poor recoatability and reduced glossiness. Furthermore, there is a pain point in the prior art that is often ignored but exists objectively: (3) The PVC mask has poor stain resistance and water whitening resistance, and can contact sweat, grease and even cosmetics of a human body in the wearing process. The traditional chlorine-vinegar ink has a loose microstructure and strong lipophilicity, and once the traditional chlorine-vinegar ink is stained with foundation liquid, lipstick or oily marker, stains are very easy to penetrate into the ink layer and cannot be erased (namely, the phenomenon of 'eating color'). Meanwhile, under a humid environment, water molecules permeate into the ink layer to cause a blushing phenomenon, so that the attractiveness is affected. The single modification means (such as grafting only long chain fatty acids or adding only silicone adjuvants) on the market at present cannot solve all the problems at the same time. The single use of long-chain fatty acid improves flexibility, but has insufficient surface dryness and stain resistance, and the single addition of organosilicon leveling agent has good hand feeling, but easily causes the loss of interlayer adhesion (difficult recoating) and cannot block the corrosion of the plasticizer to the bottom layer. Therefore, developing an intelligent ink that can both internally contain and absorb plasticizers to remain pliable and externally build a super-amphiphobic (hydrophobic oleophobic) barrier to resist contamination and release is a challenge in the art. Disclosure of Invention The invention aims to provide modified solvent type printing ink for PVC mask brushing and a preparation method thereof, and the modified solvent type printing ink is characterized in that a special double-soft-segment block copolymerization end-capped curing agent is designed, and the gradient distribution of the printing ink coating performance is realized by utilizing the cooperative assembly of dimer acid glycol and hydroxyl-terminated polydimethylsiloxane (PDMS-OH) on a molecular chain, so that the problems of back adhesion, brittle fracture and poor stain resistance are solved. In order to achieve the above purpose, the present invention adopts the following technical scheme. The modified solvent type printing ink for the PVC mask painting comprises the following raw materials in parts by weight: 45-55 parts of main resin liquid; 12-18 parts of double-modified synergistic prepolymer; 20-30 parts of pigment; 0.2-0.5 part of anti-settling agent; 0.5-2.0 parts of dispersing agent; 10-20 parts of mixed solvent. Wherein the main resin liquid is binary vinyl chloride-ethyl acetate solution with the solid content of 30 percent. Wherein the pigment is titanium dioxide. Wherein the anti-settling agent is organic bentonite or fumed silica. Wherein the dispersing agent is BYK-163 or BYK-110. Wherein the mixed solvent is butanone and butyl acetate according to the volume ratio of 6:4. Wherein the dual modified synergistic prepolymer is prepared by the steps of: Step A1, mixing dimeric alcohol and hydroxyl-terminated polydimethylsiloxane, and dehydrating for 1.5-2.0 h under the vacuum condition of 105-110 ℃ and minus 0.098MPa to obtain a mixture; the design principle is that the proportion of dimer acid and organosilicon is strictly controlled. Dimer acid is used as a 'soft segment' to provide aliphatic long chains similar to PVC plasticizer, so that the ink layer is e