Hydrolysis-resistant spinning PLA master batch formula for wet tissue and application of hydrolysis-resistant spinning PLA master batch formula

Abstract

The invention belongs to the technical field of non-woven fabric preparation, and discloses a hydrolysis-resistant spinning PLA master batch formula for a wet tissue and application of the hydrolysis-resistant spinning PLA master batch formula. The raw materials comprise the following components in parts by weight: 70-87 parts of low-melt-index polylactic resin, 0-15 parts of high-melt-index polylactic resin, 5-15 parts of an anti-hydrolysis agent, 1-10 parts of a plasticizer and 2-5 parts of an antioxidant. 5-15 wt% of hydrolysis-resistant spinning PLA master batch and 85-95 wt% of PLA master batch are mixed, and a PLA non-woven fabric is produced through a spinning technology; according to the PLA non-woven fabric wet tissue and the preparation method thereof, the problem of high-temperature aging of the PLA in the melting process is solved, hydrolysis of the PLA in wet tissue liquid medicine can be well improved, and the service life of the PLA non-woven fabric wet tissue is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of non-woven fabric preparation, and relates to a hydrolysis-resistant spinning PLA masterbatch formula and application for wet wipes. Background Art

[0002] PLA wipes are made of polylactic acid (PLA). PLA is a bio-based material, made from starchy crops such as corn and cassava or agricultural and forestry waste such as straw. It is made through microbial fermentation, lactic acid extraction, refining, dehydration, oligomerization, high-temperature cracking, and polymerization. PLA has excellent biodegradability and can be completely degraded by microorganisms in the soil within one year after being discarded, generating CO 2 and water, no pollution to the environment.

[0003] With the enhancement of environmental awareness and the increase in demand for sustainable development, traditional wet wipes materials such as polyester and polyester are gradually being eliminated due to non-degradability and environmental pollution problems. PLA wet wipes have become the new favorite of the market due to their degradability and environmental protection characteristics. PLA wet wipes are widely used in personal care, household cleaning and other fields due to their environmental protection characteristics. For example, personal care products such as face wipes and wet wipes are favored by consumers because of their natural degradability, antibacterial and anti-mite, non-toxic and health care characteristics. In addition, PLA wet wipes are also used in the medical field, such as surface wiping and disinfection of medical equipment and supplies. With the advancement of environmental protection policies and the increase in consumer demand for environmentally friendly products, the market prospects of PLA wet wipes are broad. In the future, PLA wet wipes may further replace traditional non-degradable wet wipes and become the mainstream product in the market.

[0004] Although PLA has excellent biodegradability, especially in an environment with suitable temperature and high humidity, PLA will absorb moisture strongly and decompose quickly, and will completely degrade and become ineffective in about 3-6 months. The natural degradation of PLA is mainly hydrolysis after moisture absorption. PLA itself absorbs moisture quickly and has a high equilibrium moisture absorption capacity, which creates favorable conditions for its hydrolysis. The essence of hydrolysis is the cleavage of ester groups. In an acidic environment, ester groups react with water to generate acids and alcohols. The newly generated acid will become a catalyst for the hydrolysis reaction, further aggravating the hydrolysis aging of PLA.

[0005] Industrially produced non-medical PLA materials contain unreacted polylactic acid monomers and oligomers, which are more easily water-absorbent than PLA. After absorbing water, the monomers easily react to produce acetolactic acid. Both acetolactic acid and oligomers contain terminal carboxyl groups, which can trigger the autocatalytic hydrolysis of PLA and accelerate the hydrolysis reaction.

[0006] The strength of wet wipes made of PLA meltblown / spunbond fabrics on the market decays quickly. In three months, the strength decays by about half, which greatly reduces the use cycle of wet wipes. Summary of the Invention

[0007] The object of the present invention is to overcome the deficiencies in the above-mentioned background technology, and provide a hydrolysis-resistant spinning PLA masterbatch formula and application for wet wipes, which solves the problem of high-temperature aging of PLA during the melting process, can well improve the hydrolysis of PLA in the wet wipe liquid medicine, and increases the service life of PLA non-woven wet wipes.

[0008] The technical solution adopted by the present invention to solve its technical problems is: a hydrolysis-resistant spinning PLA masterbatch formula for wet wipes. By weight, the raw materials include 70-87 parts of low-melting-point polylactic acid resin, 0-15 parts of high-melting-point polylactic acid resin, 5-15 parts of hydrolysis-resistant agent, 1-10 parts of plasticizer, and 2-5 parts of antioxidant.

[0009] Further, the hydrolysis-resistant agent is a monocarbodiimide compound.

[0010] Further, the antioxidant is 1010.

[0011] Further, the plasticizer is liquid paraffin.

[0012] Further, for the low-melting-point polylactic acid resin, its specific melt index is 40 g / 10 min.

[0013] Further, for the high-melting-point polylactic acid resin, its specific melt index is 800 g / 10 min.

[0014] The present invention also claims the preparation method of the above-mentioned hydrolysis-resistant spinning PLA masterbatch. After mixing the raw materials in proportion, the hydrolysis-resistant spinning PLA masterbatch is prepared by a screw extruder. The specific preparation process includes: raw material weighing → proportioning → high-speed mixer → spiral automatic feeding machine → screw granulator → cooling water tank → air dryer → pelletizing.

[0015] The present invention also claims the application of the hydrolysis-resistant spinning PLA masterbatch prepared by the above formula in the preparation of PLA non-woven wet wipes.

[0016] The application is specifically as follows: Step S1, prepare PLA non-woven fabric. Mix 5-15 wt% of the hydrolysis-resistant spinning PLA masterbatch with 85-95 wt% of PLA masterbatch, and produce PLA non-woven fabric by a spinning process; Step S2, prepare PLA non-woven wet wipes, and the wet wipe liquid medicine is neutral or weakly acidic; the weight ratio of the liquid medicine to the non-woven fabric is 2.3-3:1. Finally, the PLA non-woven wet wipes are prepared, wrapped with a packaging, and without light exposure.

[0017] The beneficial effects of the present invention compared with the prior art are:

[0018] The present invention provides a hydrolysis-resistant spinning PLA masterbatch formulation for wet wipes and its specific application in the preparation of wet wipes, which solves the problem of high-temperature aging of PLA during the melting process, can well improve the hydrolysis of PLA in wet wipe liquid medicine, and prolongs the service life of PLA non-woven wet wipes. Currently, there is no hydrolysis-resistant PLA spinning masterbatch for wet wipes on the market, and this invention fills the market gap. Detailed implementation mode

[0019] The present invention is not limited to the following embodiments. In the embodiments, the hydrolysis-resistant agent is a monocarbodiimide compound. The antioxidant is 1010. The plasticizer is liquid paraffin. The low melt index polylactic acid resin has a specific melt index of 40 g / 10 min. The high melt index polylactic acid resin has a specific melt index of 800 g / 10 min.

[0020] The specific preparation process of a hydrolysis-resistant spinning PLA masterbatch for wet wipes is as follows: After mixing the raw materials in proportion, a hydrolysis-resistant spinning PLA masterbatch is prepared by a screw extruder. The specific preparation process includes: raw material weighing → proportioning → high-speed mixer → spiral automatic feeding machine → screw granulator → cooling water tank → air dryer → pelletizing.

[0021] Example 1

[0022] A hydrolysis-resistant spinning PLA masterbatch formulation for wet wipes, by weight, the raw materials include 75 parts of low melt index polylactic acid resin, 0 parts of high melt index polylactic acid resin, 15 parts of hydrolysis-resistant agent, 5 parts of plasticizer, and 5 parts of antioxidant. After mixing the raw materials in proportion, a hydrolysis-resistant spinning PLA masterbatch is prepared by a screw extruder.

[0023] Example 2

[0024] A hydrolysis-resistant spinning PLA masterbatch formulation for wet wipes, by weight, the raw materials include 87 parts of low melt index polylactic acid resin, 5 parts of high melt index polylactic acid resin, 5 parts of hydrolysis-resistant agent, 1 part of plasticizer, and 2 parts of antioxidant. After mixing the raw materials in proportion, a hydrolysis-resistant spinning PLA masterbatch is prepared by a screw extruder.

[0025] Example 3

[0026] A hydrolysis-resistant spinning PLA masterbatch formulation for wet wipes, by weight, the raw materials include 83 parts of low melt index polylactic acid resin, 8 parts of high melt index polylactic acid resin, 6 parts of hydrolysis-resistant agent, 1 part of plasticizer, and 2 parts of antioxidant. After mixing the raw materials in proportion, a hydrolysis-resistant spinning PLA masterbatch is prepared by a screw extruder.

[0027] Example 4

[0028] A hydrolysis-resistant spinning PLA masterbatch formulation for wet wipes. By weight, the raw materials include 70 parts of low-melting-point polylactic acid resin, 9 parts of high-melting-point polylactic acid resin, 15 parts of hydrolysis-resistant agent, 3 parts of plasticizer, and 3 parts of antioxidant. After mixing the raw materials in proportion, the hydrolysis-resistant spinning PLA masterbatch is prepared by a screw extruder.

[0029] Example 5

[0030] A hydrolysis-resistant spinning PLA masterbatch formulation for wet wipes. By weight, the raw materials include 70 parts of low-melting-point polylactic acid resin, 10 parts of high-melting-point polylactic acid resin, 10 parts of hydrolysis-resistant agent, 5 parts of plasticizer, and 5 parts of antioxidant. After mixing the raw materials in proportion, the hydrolysis-resistant spinning PLA masterbatch is prepared by a screw extruder.

[0031] Example 6

[0032] A hydrolysis-resistant spinning PLA masterbatch formulation for wet wipes. By weight, the raw materials include 79 parts of low-melting-point polylactic acid resin, 11 parts of high-melting-point polylactic acid resin, 7 parts of hydrolysis-resistant agent, 1 part of plasticizer, and 2 parts of antioxidant. After mixing the raw materials in proportion, the hydrolysis-resistant spinning PLA masterbatch is prepared by a screw extruder.

[0033] Example 7

[0034] A hydrolysis-resistant spinning PLA masterbatch formulation for wet wipes. By weight, the raw materials include 77 parts of low-melting-point polylactic acid resin, 12 parts of high-melting-point polylactic acid resin, 8 parts of hydrolysis-resistant agent, 1 part of plasticizer, and 2 parts of antioxidant. After mixing the raw materials in proportion, the hydrolysis-resistant spinning PLA masterbatch is prepared by a screw extruder.

[0035] Example 8

[0036] A hydrolysis-resistant spinning PLA masterbatch formulation for wet wipes. By weight, the raw materials include 75 parts of low-melting-point polylactic acid resin, 5 parts of high-melting-point polylactic acid resin, 6 parts of hydrolysis-resistant agent, 10 parts of plasticizer, and 4 parts of antioxidant. After mixing the raw materials in proportion, the hydrolysis-resistant spinning PLA masterbatch is prepared by a screw extruder.

[0037] Example 9

[0038] A hydrolysis-resistant spinning PLA masterbatch formulation for wet wipes. By weight, the raw materials include 73 parts of low-melting-point polylactic acid resin, 5 parts of high-melting-point polylactic acid resin, 10 parts of hydrolysis-resistant agent, 10 parts of plasticizer, and 2 parts of antioxidant. After mixing the raw materials in proportion, the hydrolysis-resistant spinning PLA masterbatch is prepared by a screw extruder.

[0039] Example 10

[0040] A hydrolysis-resistant spinning PLA masterbatch formulation for wet wipes, by weight, the raw materials include 70 parts of low-melting-point polylactic acid resin, 15 parts of high-melting-point polylactic acid resin, 9 parts of hydrolysis-resistant agent, 1 part of plasticizer, and 5 parts of antioxidant. After mixing the raw materials in proportion, a hydrolysis-resistant spinning PLA masterbatch is prepared by a screw extruder.

[0041] In the present invention, each component is granulated, then spun into PLA non-woven fabric, and finally PLA wet wipes are obtained. The formulation provided by the present invention, through compounding, increases the compatibility between components, improves the dispersibility, and increases the adhesion to each other, and a hydrolysis-resistant spinning PLA masterbatch for wet wipes is prepared. Added to the PLA spinning masterbatch in a specific proportion, it can greatly improve the hydrolysis and aging resistance performance of PLA and extend the service life of wet wipes. The following is further illustrated by specific application examples and experimental data.

[0042] Application Example 1

[0043] The 5wt% hydrolysis-resistant spinning PLA masterbatch prepared in Example 1 is mixed with 95wt% PLA masterbatch (purchased from Haizheng 290), and PLA non-woven fabric is produced by a spinning process; the weight ratio of the liquid medicine (FSCD Foshan Chongda Wet Wipe Co., Ltd.) to the non-woven fabric is 2.3:1. Wet wipes are obtained. The test results of the strength of the aged wet wipes are shown in Table 1.

[0044] Application Example 2

[0045] The 15wt% hydrolysis-resistant spinning PLA masterbatch prepared in Example 2 is mixed with 85wt% PLA masterbatch, and PLA non-woven fabric is produced by a spinning process; the weight ratio of the liquid medicine to the non-woven fabric is 2.3:1. Wet wipes are obtained. The test results of the strength of the aged wet wipes are shown in Table 1.

[0046] Application Example 3

[0047] The 14wt% hydrolysis-resistant spinning PLA masterbatch prepared in Example 3 is mixed with 86wt% PLA masterbatch, and PLA non-woven fabric is produced by a spinning process; the weight ratio of the liquid medicine to the non-woven fabric is 2.3:1. Wet wipes are obtained. The test results of the strength of the aged wet wipes are shown in Table 1.

[0048] Application Example 4

[0049] The 5wt% hydrolysis-resistant spinning PLA masterbatch prepared in Example 4 is mixed with 95wt% PLA masterbatch, and PLA non-woven fabric is produced by a spinning process; the weight ratio of the liquid medicine to the non-woven fabric is 2.5:1. Wet wipes are obtained. The test results of the strength of the aged wet wipes are shown in Table 1.

[0050] Application Example 5

[0051] The 10 wt% hydrolysis-resistant spinning PLA masterbatch prepared in Example 5 was mixed with 90 wt% PLA masterbatch, and PLA non-woven fabric was produced by a spinning process; the weight ratio of the liquid medicine to the non-woven fabric was 2.5:1. A wet wipe was obtained.

[0052] Application Example 6

[0053] The 13 wt% hydrolysis-resistant spinning PLA masterbatch prepared in Example 6 was mixed with 87 wt% PLA masterbatch, and PLA non-woven fabric was produced by a spinning process; the weight ratio of the liquid medicine to the non-woven fabric was 2.5:1. A wet wipe was obtained. The results of the strength test of the prepared wet wipe after aging are shown in Table 1.

[0054] Application Example 7

[0055] The 12 wt% hydrolysis-resistant spinning PLA masterbatch prepared in Example 7 was mixed with 88 wt% PLA masterbatch, and PLA non-woven fabric was produced by a spinning process; the weight ratio of the liquid medicine to the non-woven fabric was 3:1. A wet wipe was obtained. The results of the strength test of the prepared wet wipe after aging are shown in Table 1.

[0056] Application Example 8

[0057] The 14 wt% hydrolysis-resistant spinning PLA masterbatch prepared in Example 8 was mixed with 86 wt% PLA masterbatch, and PLA non-woven fabric was produced by a spinning process; the weight ratio of the liquid medicine to the non-woven fabric was 3:1. A wet wipe was obtained. The results of the strength test of the prepared wet wipe after aging are shown in Table 1.

[0058] Application Example 9

[0059] The 10 wt% hydrolysis-resistant spinning PLA masterbatch prepared in Example 9 was mixed with 90 wt% PLA masterbatch, and PLA non-woven fabric was produced by a spinning process; the weight ratio of the liquid medicine to the non-woven fabric was 3:1. A wet wipe was obtained. The results of the strength test of the prepared wet wipe after aging are shown in Table 1.

[0060] Application Example 10

[0061] The 8 wt% hydrolysis-resistant spinning PLA masterbatch prepared in Example 10 was mixed with 92 wt% PLA masterbatch, and PLA non-woven fabric was produced by a spinning process; the weight ratio of the liquid medicine to the non-woven fabric was 3:1. A wet wipe was obtained. The results of the strength test of the prepared wet wipe after aging are shown in Table 1.

[0062] Table 1 Strength test table of wet wipes after aging for application examples and comparative samples

[0063]

[0064]

[0065] The above application example is compared with Comparative Example 1 and Comparative Example 2. (Comparative Example 1 is a non-woven wet wipe made of PLA of Natureworks 6252D in the United States, without adding a hydrolysis-resistant spinning PLA masterbatch; Comparative Example 2 is a non-woven wet wipe made of Hisun 290 PLA, without adding a hydrolysis-resistant spinning PLA masterbatch). It can be seen that for non-woven wet wipes added with a hydrolysis-resistant spinning PLA masterbatch, the strength attenuation is slow after aging, greatly extending the service life of the wet wipes.

[0066] The above application example is compared with Comparative Example 1 and Comparative Example 2. (Comparative Example 1 is a non-woven wet wipe made of PLA of Natureworks 6252D in the United States, without adding a hydrolysis-resistant spinning PLA masterbatch; Comparative Example 2 is a non-woven wet wipe made of Hisun 290 PLA, without adding a hydrolysis-resistant spinning PLA masterbatch). It can be seen that for non-woven wet wipes added with a hydrolysis-resistant spinning PLA masterbatch, the strength attenuation is slow after aging, greatly extending the service life of the wet wipes.

[0067] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A hydrolysis-resistant spinning PLA masterbatch for wet wipes, characterized in that: By weight, the raw materials include 70-87 parts of low melt index polylactic acid resin, 0-15 parts of high melt index polylactic acid resin, 5-15 parts of anti-hydrolysis agent, 1-10 parts of plasticizer and 2-5 parts of antioxidant.

2. The hydrolysis-resistant spinning PLA masterbatch for wet wipes as claimed in claim 1, characterized in that: The anti-hydrolysis agent is a monocarbodiimide compound.

3. The hydrolysis-resistant spinning PLA masterbatch for wet wipes according to claim 1, characterized in that: The antioxidant is 1010.

4. The hydrolysis-resistant spinning PLA masterbatch for wet wipes according to claim 1, characterized in that: The plasticizer is liquid wax.

5. The hydrolysis-resistant spinning PLA masterbatch for wet wipes according to claim 1, characterized in that: The low melt index polylactic acid resin has a specific melt index of 40 g / 10 min.

6. The hydrolysis-resistant spinning PLA masterbatch for wet wipes according to claim 1, characterized in that: The high melt index polylactic acid resin has a specific melt index of 800 g / 10 min.

7. The method for preparing hydrolysis-resistant spinning PLA masterbatch for wet wipes according to any one of claims 1 to 6, characterized in that: After the raw materials are mixed in proportion, hydrolysis-resistant spinning PLA masterbatch is prepared through a screw extruder; the specific preparation process includes: raw material weighing → proportioning → high-speed mixer → spiral automatic feeder → screw granulator → cooling water tank → blow dryer → pelletizing.

8. Use of the hydrolysis-resistant spinning PLA masterbatch according to any one of claims 1 to 6 in the preparation of PLA non-woven wet wipes.

9. Use of the hydrolysis-resistant spinning PLA masterbatch prepared by the preparation method of claim 7 in the preparation of PLA non-woven wipes.

10. The use according to claim 9, characterized in that the application Specifically, step S1, preparing PLA non-woven fabric, mixing 5-15wt% hydrolysis-resistant spinning PLA masterbatch with 85-95wt% PLA masterbatch, and producing PLA non-woven fabric by spinning process; step S2, preparing PLA non-woven fabric wet wipes, the wet wipes liquid is neutral or weakly acidic; the weight ratio of the liquid to the non-woven fabric is 2.3-3:1.

Images