Preparation and characterization of waterborne alkyd-amino baking coatings based on waste polyethylene terephthalate

The recycling of polyethylene terephthalate (PET) is the most attractive method for PET waste management because it not only decreases the load on landfill space, but also provides opportunities for reducing the use of raw petrochemical products. Therefore, in this investigation, neopentyl glycol is used for alcoholysis of waste PET, and glycolyzed PET product was applied for preparation of the waterborne alkyd resin. Furthermore, the waterborne alkyd-amino baking coatings were prepared from the waterborne alkyd based on glycolyzed waste PET and melamine formaldehyde resin and applied on tinplate. The waterborne alkyd-amino resin films showed excellent adhesion, balanced hardness and flexibility, high gloss and outstanding chemical resistance except for alkali resistance owing to hydrolysis of ester bonds.

manuscript is not properly written and have some serious language, presentation and novelty issues which may be justified before its publication in "Royal Society Open Science". So I recommend major revision this manuscript for its publication in Surface Review and Letters, I include my comment below: 1) The novelty of the manuscript is in doubt as I found similar papers on the same topic so I request the authors please highlight the difference or advancement of their work by giving the comparison table ( for example https://doi.org/10. 1016/j.wasman.2008.02.018 ; https://doi.org/10.1007/s00289-009-0166-4, etc).
2) The manuscript requires a careful English language revision for grammar, spelling mistakes and its UK English or US English pattern author use and should be adhered to single pattern. 3) Font of the text should be uniform throughout the manuscript according to the guideline of the journal. 4) Proton NMR should be written as "1HNMR". 5) In NMR discussion highlight or underline the hydrogen under the discussion. 6) In NMR, What is HIPA and HTPA? Regards Review form: Reviewer 3

Do you have any ethical concerns with this paper? No
Have you any concerns about statistical analyses in this paper? No

Recommendation?
Major revision is needed (please make suggestions in comments)

Comments to the Author(s)
Comments to the Author(s) This manuscript needs major revision. These revisions are presented below.
1. The number of literature is not enough for this topic. It is better if the number of the literature is increased. As it known, depolymerization of waste PET with glycolysis reaction have been carried out before many times in the literature. Depolymerization products of PET have been used for different fields such as preparation of unsaturated polyesters, polyurethanes, alkyd resins etc. or adsorbent for basic dyes from aqueous solutions. However, only a small number articles are given as references, in this manuscript. Therefore, it should be done literature survey in detail and related articles about reused of depolymerization product of PET should be given as reference.
2. The original aspect of this study and difference from other similar studies should be emphasized thoroughly in the introduction section. Similar studies should be summarized in a comparative table. Experimental results should be compared with similar studies which were given in the literature. 3. The abbreviations which were used in this study should be given in a separate table. 4. The experimental results should be sufficiently discussed and interpreted. The Conclusion section should be comprehensive in the light of the experiments done.

5.
The English of all manuscript should be controlled and grammatical and stylistic errors should be corrected.

28-Oct-2019
Dear Dr Yong-bo: Title: Preparation and characterization of water-borne alkyd-amino baking coatings based on waste PET Manuscript ID: RSOS-191447 Thank you for your submission to Royal Society Open Science. The chemistry content of Royal Society Open Science is published in collaboration with the Royal Society of Chemistry.
The editor assigned to your manuscript has now received comments from reviewers. We would like you to revise your paper in accordance with the referee and Subject Editor suggestions which can be found below (not including confidential reports to the Editor). Please note this decision does not guarantee eventual acceptance.
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RSC Subject Editor:
Comments to the Author: (There are no comments.) ********************************************** Reviewers' Comments to Author: Reviewer: 1 Comments to the Author(s) In this paper, the authors partially used the glycolyzed PET product to synthesize waterborne alkyd resin. The resin was further fabricated as waterborne alkyd-amino baking coatings with better mechanical properties. Although the glycolyzed PET was ever used to synthesize alkyd, it is seemed that this paper is the first time to employ the recycled PET for synthesis of waterborne alkyd. The two themes, recycling of materials and waterborne coatings, involved in this paper are both the currently hot research topics. I think the paper is publishable. Prior to publication, I suggest the authors to carry out the following revisions: (1) The authors had better compare the properties of the recycled PET-based alkyd coatings with those of commercial waterborne alkyd coatings.
(2) I do not agree that the shear thinning of the waterborne alkyd resin was caused by the open of the network structure of the molecules. It should be noted that it was the polymer dispersion not the solution involved herein. The shear thinning may be more possibly caused by the destroying of polymer droplet network.
(3) There are many grammar and editing problem. The authors should improve their writing a lot. Some examples: The last sentence of the first paragraph in Introduction section was written in wrong grammar. Subscript and superscript were not cared about throughout the manuscript. The model of GPC instrument should be Waters 1515, not Waters 515. In Table 2, "alkyd rein" should be "alkyd resin". In section 3.2, line 12 of the first paragraph, "stem" should be "stemmed".

Reviewer: 2
Comments to the Author(s) Please find here the comment for the manuscript RSOS-191447 entitled "Preparation and characterization of water-borne alkyd amino baking coatings based on waste PET". In this manuscript authors reported the synthesis waterborne alkyd amino baked coatings from the polyethylene terephthalate waste and evaluate their coating behavior by measuring it through standard tests. The Manuscript is good initiative to use the polyethylene terephthalate waste in coating industries to reduce petro based polymers and their use after the recycling process. The manuscript is not properly written and have some serious language, presentation and novelty issues which may be justified before its publication in "Royal Society Open Science". So I recommend major revision this manuscript for its publication in Surface Review and Letters, I include my comment below: 1) The novelty of the manuscript is in doubt as I found similar papers on the same topic so I request the authors please highlight the difference or advancement of their work by giving the comparison table ( for example https://doi.org/10.1016/j.wasman.2008.02.018 ; https://doi.org/10.1007/s00289-009-0166-4, etc).
2) The manuscript requires a careful English language revision for grammar, spelling mistakes and its UK English or US English pattern author use and should be adhered to single pattern. 3) Font of the text should be uniform throughout the manuscript according to the guideline of the journal. 4) Proton NMR should be written as "1HNMR". 5) In NMR discussion highlight or underline the hydrogen under the discussion. 6) In NMR, What is HIPA and HTPA? Regards Reviewer: 3 Comments to the Author(s) This manuscript needs major revision. These revisions are presented below.
1. The number of literature is not enough for this topic. It is better if the number of the literature is increased. As it known, depolymerization of waste PET with glycolysis reaction have been carried out before many times in the literature. Depolymerization products of PET have been used for different fields such as preparation of unsaturated polyesters, polyurethanes, alkyd resins etc. or adsorbent for basic dyes from aqueous solutions. However, only a small number articles are given as references, in this manuscript. Therefore, it should be done literature survey in detail and related articles about reused of depolymerization product of PET should be given as reference.
In addition, there are also many of articles about this waterborne or water reducible alkyds in the literature. Therefore, it should be done literature survey in detail again and new articles should be added to the reference list. For your review, related articles that have been in the literature presented as list below.

Dear Editors
Thank you for your letter and for the reviewers' comments concerning our manuscript (Manuscript ID: RSOS-191447) entitled "Preparation and characterization of waterborne alkyd-amino baking coatings based on waste PET". Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. Revised portion are marked in red in the revised manuscript.
We greatly appreciate your continued interest in our manuscript.

Best wishes,
Sincerely yours,

Yong-Bo Ding
The main corrections in the paper and the responds to the reviewer's comments are as following: Responds to the reviewer's comments: Reviewer #1: Comments to the Author(s) In this paper, the authors partially used the glycolyzed PET product to synthesize waterborne alkyd resin. The resin was further fabricated as waterborne alkyd-amino baking coatings with better mechanical properties. Although the glycolyzed PET was ever used to synthesize alkyd, it is seemed that this paper is the first time to employ the recycled PET for synthesis of waterborne alkyd. The two themes, recycling of materials and waterborne coatings, involved in this paper are both the currently hot research topics. I think the paper is publishable.
Prior to publication, I suggest the authors to carry out the following revisions:

Appendix A
(1) The authors had better compare the properties of the recycled PET-based alkyd coatings with those of commercial waterborne alkyd coatings.

Response: Yes, the properties of the recycled PET-based alkyd coatings had been
compared with those of commercial waterborne alkyd coatings, please see table 3 and   table 4 in the revised manuscript.   Table 2, "alkyd rein" should be "alkyd resin". In section 3.2, line 12 of the first paragraph, "stem" should be "stemmed".
Response: We are very sorry for our incorrect grammar and editing problem. These problems have been corrected in the revised manuscript.

Reviewer: 2
Comments to the Author(s) Please find here the comment for the manuscript RSOS-191447 entitled "Preparation and characterization of water-borne alkyd amino baking coatings based on waste PET".
In this manuscript authors reported the synthesis waterborne alkyd amino baked coatings from the polyethylene terephthalate waste and evaluate their coating behavior by measuring it through standard tests. The Manuscript is good initiative to use the polyethylene terephthalate waste in coating industries to reduce petro based polymers and their use after the recycling process. The manuscript is not properly written and have some serious language, presentation and novelty issues which may be justified before its publication in "Royal Society Open Science". So I recommend major revision this manuscript for its publication in Surface Review and Letters, I include my comment below: 1) The novelty of the manuscript is in doubt as I found similar papers on the same topic so I request the authors please highlight the difference or advancement of their 2) The manuscript requires a careful English language revision for grammar, spelling mistakes and its UK English or US English pattern author use and should be adhered to single pattern.
Response: We are very sorry for our incorrect grammar and editing problem. These problems have been corrected in the revised manuscript.
3) Font of the text should be uniform throughout the manuscript according to the guideline of the journal.
Response: We are very sorry for our incorrect uniform. These problems have been corrected in the revised manuscript.

5)
In NMR discussion highlight or underline the hydrogen under the discussion.
Response: Yes, in NMR discussion, the hydrogen under the discussion had been underlined.
Response: We are very sorry for our wrong ways, HIPA and HTPA had been revised.

Reviewer: 3
Comments to the Author(s) This manuscript needs major revision. These revisions are presented below.
1. The number of literature is not enough for this topic. It is better if the number of the literature is increased. As it known, depolymerization of waste PET with glycolysis reaction have been carried out before many times in the literature. Depolymerization products of PET have been used for different fields such as preparation of unsaturated polyesters, polyurethanes, alkyd resins etc. or adsorbent for basic dyes from aqueous solutions. However, only a small number articles are given as references, in this manuscript. Therefore, it should be done literature survey in detail and related articles about reused of depolymerization product of PET should be given as reference.
In addition, there are also many of articles about this waterborne or water reducible alkyds in the literature. Therefore, it should be done literature survey in detail again and new articles should be added to the reference list. For your review, related articles that have been in the literature presented as list below.