Rosin modified wood primer and preparation method thereof

Abstract

The invention discloses a rosin modified wood primer and a preparation method thereof. The wood primer is prepared from the following components in percentage by mass: 15-20% of fatty acid, 15-20% of abietic acid, 15-20% of polyhydric alcohol, 0.1-0.5% of a color reducing agent, 25-35% of polybasic acid and 20-30% of a diluent. Various reaction raw materials are screened out through a large number of experiments, the woodware primer prepared through abietic acid modification, adjustment of the proportion of fatty acid, mono-acid and abietic acid in dry resin and formulation of reasonable specific reaction steps is good in paint film transparency, fast in drying, light in color, good in flexibility and impact resistance, good in weather resistance and good in weather resistance. Particularly, the permeability is high, and the anti-collapse performance is excellent.

Description

Technical Field

[0001] The invention relates to a rosin modified wood primer and a preparation method thereof. Background Art

[0002] After a while, the wood grain of furniture surfaces that have been sealed and leveled with wood primer will collapse downward. Since natural wood has ducts of varying diameters, when an ideal wood primer is applied to the wood surface, the paint should flow into and penetrate deep into these ducts, filling or stuffing the wood ducts as much as possible, so that the surface paint coating will not easily collapse. However, if the primer has poor wettability and permeability to the wood, it will not be able to fill the gaps in the wood ducts well, and over time, the paint film will sink deep into the ducts.

[0003] To improve the collapse of wood, it is necessary to improve the wettability and permeability of the resin body or paint system to the wood substrate. Therefore, it is necessary to design and develop a wood primer that dries quickly, has good permeability and anti-collapse properties based on the existing technology. Summary of the invention

[0004] The purpose of the present invention is to develop a rosin-modified wood primer resin. The resin of the present invention is applied to wood coatings, and the paint film has the advantages of good transparency, fast drying, good flexibility, good impact resistance, good permeability and good anti-collapse performance.

[0005] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0006] The invention relates to a rosin modified wood primer, which is prepared from 15-20% by mass of fatty acid, 15-20% by mass of rosin acid, 15-20% by mass of polyol, 0.1-0.5% by mass of a color reducing agent, 25-35% by mass of polyacid and 20-30% by mass of a diluent.

[0007] Wherein, the fatty acid is vegetable oil oleic acid or monooleic acid with an iodine value of 120-140.

[0008] Wherein, the polyol is one or more of propylene glycol, ethylene glycol or monopentaerythritol.

[0009] Wherein, the color reducing agent is one of triphenyl phosphite and hypophosphorous acid.

[0010] Wherein, the polyacid is one or more of phthalic anhydride, benzoic acid, maleic anhydride or rosin acid.

[0011] Wherein, the diluent is one of xylene, trimethylbenzene or toluene or a mixture of several of them.

[0012] The preparation method of the rosin modified wood primer provided by the present invention comprises the following steps:

[0013] 1) putting oleic acid, monoolefinic acid, glycerol, phthalic anhydride, benzoic acid, rosin acid, a color reducing agent and a diluent with an iodine value of 120-130 into a reaction container according to mass percentage, and slowly heating;

[0014] 2) Introduce nitrogen into the reactor to evacuate the air in the reactor;

[0015] 3) Raise the temperature to 160-180°C and keep the reaction for 2 hours;

[0016] 4) Raise the temperature to 180-200°C and keep warm for 2 hours;

[0017] 6) Raise the temperature to 200-220°C, keep warm for 3-4 hours, and measure the acid value and viscosity;

[0018] 7) Cool down to below 140°C, add diluted toluene and stir for 1 hour;

[0019] 8) cooling and filtering to obtain a rosin-modified wood primer resin.

[0020] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0021] The alkyd resins for anti-collapse wood paints currently on the market mainly use lower viscosity to achieve their wettability to wooden floor materials and permeability to conduits. Such alkyd resins usually cure slowly and incompletely, and require a long time to fully cure. In this way, although the permeability is partially improved and it helps to prevent collapse, it can still collapse visible to the naked eye in a relatively short period of time over time, and the problem is not fundamentally solved. To further alleviate or completely solve the collapse problem of alkyd resins, it is also necessary to further improve the wettability and permeability of alkyd resins, and to improve their curing speed and hardness after curing, so that the resin has good early drying and hardness (early curing performance) after paint construction, so that the paint film is set early, which can greatly improve the anti-collapse property of the paint film. To better improve the anti-collapse property, it is also necessary to further increase the construction solid content and reduce the collapse of the paint film caused by the solvent volatilization process.

[0022] The present invention greatly improves the anti-collapse property of alkyd resin through three technical innovations: (1) Through rosin acid modification, the oil content of the resin (the proportion of fatty acids, monoacids and rosin acid in the dry resin) is 10%-20% higher than that of conventional wood resin, which is very beneficial for obtaining low-viscosity alkyd resin, thereby improving the permeability of the resin to the conduits of wooden floor materials. In addition, the polarity of the alkyd resin with a high oil content is very low, which further improves the wettability of the resin to the substrate. The above two effects further greatly improve the wettability and permeability of the alkyd resin to wood. (2) After the oil content of the alkyd resin is improved, the alkyd resin formula can use more trifunctional alcohols (such as trimethylolpropane or tetrafunctional alcohols, such as pentaerythritol). The above multifunctional alcohols can improve the early curing performance of the resin, thereby improving the anti-collapse property of the resin. (3) After the oil content of the alkyd resin is improved, the construction solid content after the paint can be greatly improved, thereby reducing the solvent volatilization and further improving the anti-collapse property of the resin.

[0023] The present invention obtains the best raw material ratio composition through a large number of experimental screenings and prepares a rosin-modified wood primer by optimizing the polymerization process. The rosin-modified wood primer has excellent comprehensive performance after painting, especially fast drying, outstanding permeability and anti-collapse performance, and achieves good technical progress. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to specific embodiments, but is not intended to limit the present invention.

[0025] Example 1

[0026] A method for preparing a rosin-modified wood primer comprises the following steps:

[0027] (1) In a four-necked flask equipped with a stirring device, a thermometer and nitrogen protection, 250 g of soybean oil fatty acid, 125 g of rosin acid, 170 g of monopentaerythritol, 75 g of ethylene glycol, 250 g of phthalic anhydride, 25 g of benzoic acid, 2 g of maleic anhydride, 15 g of xylene and 1 g of a color reducing agent were added in sequence, and then the temperature was slowly raised;

[0028] (2) Raise the temperature to 150-190°C, keep warm for 5 hours, and control the distillation temperature ≤105°C;

[0029] (3) Continue to raise the temperature to 200-220°C, add 20 g of xylene, and reflux for esterification for 4 hours;

[0030] (4) After the insulation is completed, the temperature is continued to be controlled at 200-220°C. The intermediate control is measured. 10g of resin sample is diluted with 5.5g of xylene. The acid value is ≤12 and the viscosity is 100-120 seconds / 25°C. The format tube is the end point.

[0031] (5) After the reaction is completed, the temperature is lowered to 140-150°C, 240 g of xylene is added for dilution, and then the mixture is stirred for 30-40 minutes and filtered and packaged.

[0032] Example 2

[0033] A method for preparing a rosin-modified wood primer comprises the following steps:

[0034] (1) In a four-necked flask equipped with a stirring device, a thermometer and nitrogen protection, 250 g of soybean oil fatty acid, 60 g of rosin acid, 130 g of monopentaerythritol, 85 g of ethylene glycol, 250 g of phthalic anhydride, 35 g of benzoic acid, 2 g of maleic anhydride, 20 g of xylene and 1 g of a color reducing agent were added in sequence, and then the temperature was slowly raised;

[0035] (2) Raise the temperature to 150-190°C, keep warm for 4 hours, and control the distillation temperature ≤105°C;

[0036] (3) Continue to raise the temperature to 200-220°C, add 15 g of xylene, and reflux for esterification for 4 hours;

[0037] (4) After the insulation is completed, the temperature is continued to be controlled at 200-220°C. The intermediate control is measured. 10g of resin sample is diluted with 5.5g of xylene. The acid value is ≤12 and the viscosity is 280-300 seconds / 25°C in a format tube as the end point.

[0038] (5) After the reaction is completed, the temperature is lowered to 140-150°C, 100 g of xylene is added for dilution, and then 150 g of toluene is added. After stirring for 30-40 minutes, the mixture is filtered and packaged.

[0039] Example 3

[0040] A method for preparing a rosin-modified wood primer comprises the following steps:

[0041] (1) In a four-necked flask equipped with a stirrer, a thermometer and nitrogen protection, 250 g of soybean oil fatty acid, 20 g of rosin acid, 120 g of monopentaerythritol, 90 g of ethylene glycol, 250 g of phthalic anhydride, 50 g of benzoic acid, 20 g of xylene and 1 g of a color reducing agent were added in sequence, and the temperature was slowly raised;

[0042] (2) Raise the temperature to 160-180°C and keep warm for 2 hours;

[0043] (3) Raise the temperature to 180-200°C and keep warm for 2 hours;

[0044] (4) Raise the temperature to 200-210°C and keep warm for 3-4 hours;

[0045] (5) After the insulation is completed, the temperature is controlled at 200-210°C and the central control is measured. Take 10g of the resin sample and dilute it with 5.7g of xylene. The acid value is ≤10 and the viscosity is 200-220 seconds / 25°C format tube.

[0046] (6) After the reaction is completed, the temperature is lowered to below 120°C, 250 g of toluene is added for dilution, and then the mixture is stirred for 30 to 40 minutes and filtered and packaged.

[0047] Example 4 Testing of paint film properties

[0048] 1. According to the national standard, the resins obtained in Examples 1-3 were respectively prepared into component A paint according to the following matte topcoat primer formula, and then sprayed at a ratio of component A: component B: component C = 1:0.5:0.5 for parallel testing. The proportions of each component of the wood primer are shown in Table 1 below, and the spray film thickness is 100 microns (thick film primer).

[0049] Table 1 Wood primer ratio

[0050]

[0051] 2. The specific measurement results are shown in Table 2.

[0052] Table 2 Performance test results of the primers of Examples 1 to 3

[0053]

[0054] The above performance test results show that the wood primers prepared in Examples 1 to 3 of the present invention all have excellent comprehensive properties. In particular, since Example 1 contains the most rosin, it has the highest oil length under the condition of a certain soybean oleic acid content, so more high-functionality pentaerythritol can be used to reduce the amount of difunctional polyols, which not only dries the fastest, but also has the best permeability and wettability, so it has the best anti-collapse property. In Examples 2-3, the rosin is reduced successively, and in order to balance the functionality, the pentaerythritol is reduced successively, and the diol is increased, so the drying becomes slower, and benzoic acid needs to be added to prevent excessive attenuation of the drying property after the reduction of pentaerythritol. Due to the reduction of polyols, the drying property becomes worse and the anti-collapse property is weakened.

[0055] The comparison column selects Sanmu Classic rosin-free anti-slump primer resin 3107-60 (rosin-free) for comparison, and it can be seen that the anti-slump property is worse than that of the implementation column. Finally, the wood primer prepared by the present invention has better paint film transparency, faster drying, better flexibility, better impact resistance, and has the advantages of good permeability and good anti-slump property, etc. compared with conventional commercially available wood primer products. Compared with the prior art, it has made significant progress.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A rosin modified wood primer, characterized in that: The invention is prepared from the following raw materials in percentage by mass: 15-20% of fatty acid, 15-20% of rosin acid, 15-20% of polyol, 0.1-5% of color reducing agent, 25-35% of polyacid and 20-30% of diluent.

2. The rosin-modified wood primer resin according to claim 1, characterized in that: The fatty acid is one or a mixture of soybean oil acid and monoenoic acid with an iodine value of 120-140.

3. The rosin modified wood primer according to claim 1, characterized in that: The polyol is propylene glycol, ethylene glycol or monopentaerythritol.

4. The rosin modified wood primer according to claim 1, characterized in that: The color reducing agent is one of triphenyl phosphite and hypophosphorous acid.

5. The rosin modified wood primer according to claim 1, characterized in that: Among them, The polyacid is one or a mixture of phthalic anhydride, benzoic acid, maleic anhydride or rosin acid.

6. The rosin modified wood primer according to claim 1, characterized in that: The diluent is one of xylene, trimethylbenzene or n-butyl ester or a mixture of the two or more.

7. The method for preparing the rosin-modified wood primer according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) adding fatty acid, rosin acid, polyol, polyacid, color reducing agent and diluent into a reaction container according to mass percentage, and slowly raising the temperature; (2) introducing nitrogen into the reaction kettle to exhaust the air in the kettle; (3) Slowly raise the temperature to 160-180°C and keep the temperature for 1-2 hours; (4) Continue to raise the temperature to 200-210°C and reflux for esterification for 4 hours to measure the acid value and viscosity; (5) Cooling to 120-130°C, adding diluent, and stirring for 1 hour; (6) cooling and filtering to obtain a rosin-modified wood primer.

8. A method for preparing a rosin-modified wood primer, characterized in that: The following steps are involved: (1) In a four-necked flask equipped with a stirring device, a thermometer and nitrogen protection, 250 g of soybean oil fatty acid, 125 g of rosin acid, 170 g of monopentaerythritol, 75 g of ethylene glycol, 250 g of phthalic anhydride, 25 g of benzoic acid, 2 g of maleic anhydride, 15 g of xylene and 1 g of a color reducing agent were added in sequence, and then the temperature was slowly raised; (2) Raise the temperature to 150-190°C, keep warm for 5 hours, and control the distillation temperature ≤105°C; (3) Continue to raise the temperature to 200-220°C, add 20 g of xylene, and reflux for esterification for 4 hours; (4) After the insulation is finished, the temperature is continued to be controlled at 200-220°C, and the central control is measured. After 10g of the resin sample is diluted with 5.5g of xylene, the acid value is measured to be ≤12, and the viscosity is 100-120 seconds / 25°C format tube as the end point; (5) After the reaction is completed, the temperature is lowered to 140-150°C, 240 g of xylene is added for dilution, and then stirred and filtered.

9. A method for preparing a rosin-modified wood primer, characterized in that: The following steps are involved: (1) In a four-necked flask equipped with a stirring device, a thermometer and nitrogen protection, 250 g of soybean oil fatty acid, 60 g of rosin acid, 130 g of monopentaerythritol, 85 g of ethylene glycol, 250 g of phthalic anhydride, 35 g of benzoic acid, 2 g of maleic anhydride, 20 g of xylene and 1 g of a color reducing agent were added in sequence, and then the temperature was slowly raised; (2) Raise the temperature to 150-190°C, keep warm for 4 hours, and control the distillation temperature ≤105°C; (3) Continue to raise the temperature to 200-220°C, add 15 g of xylene, and reflux for esterification for 4 hours; (4) After the insulation is finished, the temperature is continued to be controlled at 200-220°C, and the central control is measured. After 10g of the resin sample is diluted with 5.5g of xylene, the acid value is measured to be ≤12, and the viscosity is 280-300 seconds / 25°C format tube as the end point; (5) After the reaction is completed, the temperature is lowered to 140-150°C, 100 g of xylene is added for dilution, and then 150 g of toluene is added, stirred, and filtered.

10. A method for preparing a rosin-modified wood primer, characterized in that: The following steps are involved: (1) In a four-necked flask equipped with a stirrer, a thermometer and nitrogen protection, 250 g of soybean oil fatty acid, 20 g of rosin acid, 120 g of monopentaerythritol, 90 g of ethylene glycol, 250 g of phthalic anhydride, 50 g of benzoic acid, 20 g of xylene and 1 g of a color reducing agent were added in sequence, and the temperature was slowly raised; (2) Raise the temperature to 160-180°C and keep warm for 2 hours; (3) Raise the temperature to 180-200°C and keep warm for 2 hours; (4) Raise the temperature to 200-210°C and keep warm for 3-4 hours; (5) After the insulation is completed, the temperature is controlled at 200-210°C and the control is measured. 10g of the resin sample is diluted with 5.7g of xylene and the acid value is measured to be ≤10, and the viscosity is 200-220 seconds / 25°C format tube; (6) After the reaction is completed, the temperature is lowered to below 120°C, 250 g of toluene is added for dilution, and then stirred and filtered.

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