阅读说明：本技术 一种保护膜用表面活性剂及其制备方法 (Surfactant for protective film and preparation method thereof ) 是由 胡程鹏 周守发 安佳丽 牛正富 祝亮 于 2019-11-13 设计创作，主要内容包括：本发明公开了一种保护膜用表面活性剂,所述表面活性剂中各组分及其重量份是：紫外光吸收剂为0.1～2,丙烯酸树脂增稠剂为0.05～5,非离子表面活性剂为2～10,阴离子表面活性剂为2～8、去离子水为80～95。本发明所述表面活性剂可用于汽车领域,使得汽车保护膜具有抗紫外光老化的性能,并且粘贴保护膜时间长,剥离强度增长小于15％,无残胶,贴合牢固,具有清洁和润滑的功能。(The invention discloses a surfactant for a protective film, which comprises the following components in parts by weight: 0.1-2 parts of ultraviolet absorber, 0.05-5 parts of acrylic resin thickener, 2-10 parts of nonionic surfactant, 2-8 parts of anionic surfactant and 80-95 parts of deionized water. The surfactant disclosed by the invention can be used in the field of automobiles, so that the automobile protective film has the ultraviolet light aging resistance, is long in protective film pasting time, has the peel strength increase of less than 15%, has no residual glue, is firmly pasted, and has the functions of cleaning and lubricating.)

1. The surfactant for the protective film is characterized by comprising the following components in parts by weight:

the ultraviolet light absorber is a water-soluble ultraviolet light absorber and is selected from one of 2-phenylbenzimidazole-5-sulfonic acid, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid or 2-hydroxy-4-methoxybenzophenone-5-sodium sulfonate.

2. The surfactant for protective film according to claim 1, wherein the ultraviolet absorber is a mixture of 2-phenylbenzimidazole-5-sulfonic acid, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid and sodium 2-hydroxy-4-methoxybenzophenone-5-sulfonate, wherein the amount of 2-phenylbenzimidazole-5-sulfonic acid is 20-30% of the total amount of the ultraviolet absorber, the amount of 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid is 30-50% of the total amount of the ultraviolet absorber, the amount of sodium 2-hydroxy-4-methoxybenzophenone-5-sulfonate is 20-50% of the total amount of the ultraviolet absorber, the sum of the three components should be 100%.

3. Surfactant for protective films according to claim 1, characterised in that said acrylic resin thickener is an acrylic polymer containing polyalkenyl polyether cross-links, preferably allyl pentaerythritol and acrylic acid cross-links, C₁₀-C₃₀One of an alkanol acrylate and acrylic acid cross-linked polymer, allyl sucrose and acrylic acid cross-linked polymer.

4. The acrylic resin thickener of claim 3 wherein said acrylic resin thickener is a cross-linked polymer of allyl pentaerythritol and acrylic acid, C₁₀-C₃₀A mixture of alkanol acrylate and acrylic acid cross-linked polymer, allyl sucrose and acrylic acid cross-linked polymer, wherein the dosage of the allyl pentaerythritol and the acrylic acid cross-linked polymer is 10-20 percent of the total dosage of the acrylic resin thickener, and C₁₀-C₃₀The dosage of the alkanol acrylate and the acrylic acid cross-linked polymer is 30-60% of the total dosage of the acrylic resin thickener, the dosage of the allyl sucrose and the acrylic acid cross-linked polymer is 20-60% of the total dosage of the acrylic resin thickener, and the total of the three components is 100%.

5. The surfactant for protective films according to claim 1, wherein the nonionic surfactant is one or a combination of fatty alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether, and alkylphenol polyoxyethylene ether.

6. The surfactant for protective film according to claim 1, wherein the anionic surfactant is one or a combination of sodium dodecylbenzenesulfonate and sodium fatty acid methyl ester sulfonate.

Technical Field

The invention relates to the technical field of films, in particular to a surfactant for a protective film.

Background

In the use process of an automobile, a main method for protecting the paint surface of an automobile body is to attach a layer of protective film to the surface of the automobile, the protective film on the surface of the automobile is required to have strong ultraviolet light aging resistance and firm and stable adhesion, and after the protective film is peeled off, residual glue cannot be left on the paint surface, and the residual glue can pollute or destroy the original factory paint of the automobile.

The main reasons for the problem of adhesive residue are two: firstly, the adhesive for the protective film is aged and damaged under the irradiation of ultraviolet light; secondly, after the protective film is adhered on the paint surface, the peel strength of the protective film continuously increases along with the time, and when the peel strength exceeds the cohesive strength or the adhesive base force, the residual adhesive is caused when the protective film is torn off.

Aiming at the problem of residual glue of the protective film, the emphasis is on coating an ultraviolet-resistant coating on the surface of a protective film substrate or adding an ultraviolet absorber into an adhesive. Chinese patent CN108659698A discloses an ultraviolet light curing coating for an automobile paint surface protective film and a using method thereof, the ultraviolet light curing coating is composed of aliphatic polyurethane acrylic resin oligomer, hydrophobic polyfunctional acrylic monomer, hydrophobic monofunctional acrylic monomer, modified perfluoropolyether, ultraviolet absorbent, photoinitiator, leveling agent and solvent, and the ultraviolet light curing coating is coated on the surface of a flexible base material to provide excellent ultraviolet aging resistance for a protective film layer. What this patent was solved is that the resistant ultraviolet of lacquer painting protection film surface self-repair coating is ageing-resistant, and it is long to do not effectively solve the adhesive and paste the lacquer painting time, and peeling strength lasts the increase to the problem that the cull appears when leading to tearing the protection film, and the adhesive is directly pasted on the lacquer painting, takes place ageing destruction under ultraviolet light and hot oxygen dual function, probably leaves the cull at the lacquer painting.

Disclosure of Invention

The invention aims to solve the technical problem that the prior art cannot effectively solve the problem of adhesive residue after a protective film is adhered, and provides a surfactant for a protective film and a preparation method thereof, which can be used for solving the problem of adhesive residue on a film for an automobile paint surface and have cleaning and lubricating effects.

In order to solve the technical problems, the invention adopts the following technical scheme:

the surfactant for the protective film comprises the following components in parts by weight:

the ultraviolet light absorber is a water-soluble ultraviolet light absorber and is selected from one of 2-phenylbenzimidazole-5-sulfonic acid, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid or 2-hydroxy-4-methoxybenzophenone-5-sodium sulfonate.

The ultraviolet absorber is a mixture of three components of 2-phenylbenzimidazole-5-sulfonic acid, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid and 2-hydroxy-4-methoxybenzophenone-5-sodium sulfonate, wherein, the dosage of the 2-phenylbenzimidazole-5-sulfonic acid is 20 to 30 percent of the total dosage of the ultraviolet absorber, the dosage of the 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid is 30 to 50 percent of the total dosage of the ultraviolet absorber, the dosage of the 2-hydroxy-4-methoxybenzophenone-5-sodium sulfonate is 20 to 50 percent of the total dosage of the ultraviolet absorber, and the total of the three components is 100 percent.

The surfactant for protective film comprises acrylic polymer containing polyalkenyl polyether crosslink selected from allyl pentaerythritol and acrylic acid crosslinked polymer, and C₁₀-C₃₀One of an alkanol acrylate and acrylic acid cross-linked polymer, allyl sucrose and acrylic acid cross-linked polymer.

The surface active agent for the protective film comprises an acrylic resin thickener and a surfactant, wherein the acrylic resin thickener is allyl pentaerythritol and acrylic acid cross-linked polymer, and C₁₀-C₃₀A mixture of three components of alkanol acrylate and acrylic acid cross-linked polymer and allyl sucrose and acrylic acid cross-linked polymer, wherein the dosage of the allyl pentaerythritol and the acrylic acid cross-linked polymer is 10 to 20 percent of the total dosage of the acrylic resin thickener, and C₁₀-C₃₀The dosage of the alkanol acrylate and the acrylic acid cross-linked polymer is 30-60 percent of the total dosage of the acrylic resin thickener, the dosage of the allyl sucrose and the acrylic acid cross-linked polymer is 20-60 percent of the total dosage of the acrylic resin thickener, and the total of the three components is 100 percent。

The surfactant for the protective film is characterized in that the nonionic surfactant is one or a combination of fatty alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether and alkylphenol polyoxyethylene ether.

The surface active agent for the protective film is characterized in that the anionic surface active agent is one or a combination of sodium dodecyl benzene sulfonate or sodium fatty acid methyl ester sulfonate.

Advantageous effects

Compared with the prior art, the invention has the following advantages:

1. the surfactant prepared by the invention is coated between the adhesive layer of the paint surface protective film and the automobile paint surface, the added water-soluble ultraviolet absorber and the acrylic resin thickener respectively contain sulfonyl, carboxylic acid group and other polar groups, and the polar groups interact with hydroxyl, carboxylic acid group and other polar groups in the adhesive layer to form a stable structure, thereby effectively reducing the permeation of molecular chains of the adhesive layer to a paint surface microporous structure, preventing the peel strength of the protective film from increasing along with the extension of the pasting time, and reducing the occurrence of adhesive residue during peeling.

2. The water-soluble ultraviolet absorber is added into the surfactant prepared by the invention, so that ultraviolet light can be effectively absorbed, and the adhesive residue caused by aging damage of the ultraviolet light to the adhesive layer is prevented.

3. The surfactant prepared by the invention is added with the nonionic surfactant and the anionic surfactant, has a synergistic effect and stronger cleaning capability.

Detailed description of the preferred embodiments

The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.

The water-soluble ultraviolet absorber comprises 2-phenylbenzimidazole-5-sulfonic acid of TCI, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid of Shanghai Mielin Biotechnology Co., Ltd, and sodium 2-hydroxy-4-methoxybenzophenone-5-sulfonate of Qingdajiedujia new material technology Co., Ltd.

The adhesive force of the automobile paint surface protective film is preferably 10-15N/25 mm.

The invention has the characteristics of firm and stable initial adhesion; the peeling force of the paint surface protective film after aging is not increased more than 15%, and the paint surface has no residual glue after the protective film is peeled.