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Preparation process of solid acrylic resin suitable for UV photocuring system

A solid acrylic acid preparation technology, applied in coatings, anti-corrosion coatings, etc., can solve problems such as difficulty in continuous dissolution, failure to meet environmental protection requirements, and large molecular weight distribution coefficient, so as to reduce the use of organic solvents and benefit environmental protection requirements. Effect of Narrow Molecular Weight Distribution

Active Publication Date: 2021-06-01
BOLIER CHEM YANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the acrylic resins currently used in UV photocuring systems are mainly saturated resins, which cannot undergo further crosslinking reactions during photocuring and film formation, and are only used in UV photocuring systems as inert additives / auxiliaries. The combined use of coating affects the physical and chemical properties such as hardness of the coating film, adhesion to the substrate, alcohol resistance and corrosion resistance, thus limiting its wide application
[0004] In addition, with the increasing environmental protection requirements, more and more paint manufacturers hope to increase the solid content of solvent-based coatings, but using the existing acrylic resin to increase the solid content will encounter the following two problems: It is difficult to continue to dissolve; the viscosity of the coating is too high under high solid content, which leads to the failure of normal coating construction; therefore, acrylic resin with high solid and low viscosity characteristics has also become an ideal product for UV light curing applications.
[0005] In addition, the current solid acrylic resins for coatings and inks are mainly produced by suspension polymerization, because the polymerization self-acceleration effect of bulk polymerization in the middle and late stages of polymerization can easily lead to implosion and difficulty in controlling the polymerization temperature, which can easily lead to The obtained solid acrylic resin has problems such as too wide molecular weight distribution, large molecular weight distribution coefficient, and many residual monomers. If such a solid acrylic resin is used, it is easy to cause the coating or ink produced to have: poor storage stability, easy to Precipitation, delamination, and blooming phenomenon; strong odor; poor adhesion to the substrate; prone to defects such as blistering, peeling, discoloration, and shrinkage
However, it can be seen from common knowledge that there is a wastewater treatment problem in the suspension polymerization method, which does not meet the current environmental protection requirements; and at the end of the polymerization, a polymerization inhibitor needs to be used to terminate the reaction, the process control requirements are harsh, the product quality consistency is poor, and the defect rate is high; Polymerization method, only need to add monomer, initiator and molecular weight regulator in the polymerization process, no solvent is needed, no waste water is produced, environment friendly, high production efficiency, low production cost, and the product is pure, uniform in color and consistent in product quality Well, it has become the polymerization process encouraged by today's industrialization

Method used

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  • Preparation process of solid acrylic resin suitable for UV photocuring system
  • Preparation process of solid acrylic resin suitable for UV photocuring system
  • Preparation process of solid acrylic resin suitable for UV photocuring system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0035] 432 grams of MMA (methyl methacrylate) 100, 150 grams of BMA (n-butyl methacrylate), 18 grams of TPGDA (tripropylene glycol diacrylate), 3 grams of lauroyl peroxide and 30 grams of n-dodecyl Mercaptans were all added to the bulk polymerization bag, and after stirring to make the mixture uniform, the bulk polymerization bag was placed in a water bath, and the polymerization reaction was continued under constant temperature heating in the water bath until the end of the polymerization reaction (see Table 1 for the specific water bath temperature and reaction time. ), and then take out the bulk polymer bag, cool to room temperature, and pulverize the obtained solid acrylic resin to obtain the final product.

[0036] Each embodiment reaction condition of table 1 and test result

[0037]

[0038] It can be seen from the results shown in Table 1 that the solid acrylic resin with narrow molecular weight distribution and low monomer residual rate can be obtained by adopting ...

Embodiment 4-5

[0047] 432 grams of MMA (methyl methacrylate) 100, 150 grams of BMA (n-butyl methacrylate), 18 grams of TPGDA (tripropylene glycol diacrylate), 3 grams of lauroyl peroxide, 0.6 grams of 2,5-bis Methyl-2,5-bis(tert-butylperoxy)hexane (bis-pentasulfurizing agent) or tert-butylperoxyhexahydroterephthalate (KAYAESTER HTP-65W) and 30 grams of Add all the alkyl mercaptans into the bulk polymerization bag, stir to make the mixture uniform, put the bulk polymerization bag into a water bath at 55°C, and continue to carry out the polymerization reaction under constant temperature heating in the water bath until the end of the polymerization reaction, and then carry out molecular weight distribution and monomer The residual rate detection, the specific results are shown in Table 3.

[0048] Each embodiment reaction condition of table 3 and test result

[0049]

[0050] As can be seen from the results shown in Table 3: under the same conditions, when a certain proportion of co-initiat...

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Abstract

The invention discloses a preparation process of solid acrylic resin suitable for a UV photocuring system, which is a bulk polymerization method. The preparation process specifically comprises the following steps: adding 100 parts by mass of at least one monofunctional monomer with one polymerizable double bond in each molecule, 1-10 parts by mass of a bifunctional monomer with two polymerizable double bonds in each molecule, 0.1-5.0 parts by mass of an initiator and 1-10 parts by mass of a chain transfer agent into a bulk polymerization reactor capable of realizing water bath heating; and after uniformly stirring and mixing, continuously carrying out polymerization reaction in the bulk polymerization reactor under the condition of heating in a constant-temperature water bath at 40-90 DEG C until the polymerization reaction is finished. The preparation process has the advantages of simple preparation process, short reaction period, environmental protection, energy conservation, easiness in batch realization and the like; and the prepared solid acrylic resin has the advantages of solubility, double-bond activity, compatibility with various UV monomers, high-solid low-viscosity characteristics and the like.

Description

technical field [0001] The invention relates to a preparation process of a solid acrylic resin, in particular to a preparation process of a solid acrylic resin suitable for UV light curing systems, and belongs to the technical field of functional material preparation. Background technique [0002] In recent years, with the further strengthening of people's awareness of environmental protection and the successive introduction of my country's environmental protection policies, great changes have taken place in the industrial sector, among which the chemical industry bears the brunt and is facing new tests in the new environment. Since UV light curing technology is an environmentally friendly and low VOC emission technology, UV light curing film formation has the advantages of high efficiency, energy saving, environmental friendliness, economy, and strong adaptability. Therefore, UV light curing technology has become one of the main development and research hotspots today. one....

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F220/18C08F222/20C08F2/02C08F2/38C09D133/12C09D5/08
CPCC08F220/14C08F2/02C08F2/38C09D133/12C09D5/08C08F2/48C08F265/06C09D4/06C09D151/003C09D133/14C08F220/1804C08F222/102C08F222/103C08F220/1811C08F20/06C08K5/14
Inventor 夏维申吉生张正风
Owner BOLIER CHEM YANGZHOU